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/*--------------------------------------------------------PRuF0.7.1
__/\\\\\\\\\\\\\ _____/\\\\\\\\\ _______/\\./\\ ___/\\\\\\\\\\\\\\\
 _\/\\\/////////\\\ _/\\\///////\\\ ____\//..\//____\/\\\///////////__
  _\/\\\.......\/\\\.\/\\\.....\/\\\ ________________\/\\\ ____________
   _\/\\\\\\\\\\\\\/__\/\\\\\\\\\\\/_____/\\\____/\\\.\/\\\\\\\\\\\ ____
    _\/\\\/////////____\/\\\//////\\\ ___\/\\\___\/\\\.\/\\\///////______
     _\/\\\ ____________\/\\\ ___\//\\\ __\/\\\___\/\\\.\/\\\ ____________
      _\/\\\ ____________\/\\\ ____\//\\\ _\/\\\___\/\\\.\/\\\ ____________
       _\/\\\ ____________\/\\\ _____\//\\\.\//\\\\\\\\\ _\/\\\ ____________
        _\/// _____________\/// _______\/// __\///////// __\/// _____________
         *-------------------------------------------------------------------*/

/*-----------------------------------------------------------------
 *  TO DO
 *-----------------------------------------------------------------
 * UTILITY TOKEN CONTRACT
 *---------------------------------------------------------------*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.6.7;

import "./PRUF_INTERFACES.sol";
import "./AccessControl.sol";
import "./ERC20Burnable.sol";
import "./Pausable.sol";
import "./ERC20Snapshot.sol";

/**
 * @dev {ERC20} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a MINTER_ROLE that allows for token minting (creation)
 *  - a PAUSER_ROLE that allows to stop all token transfers
 *  - a SNAPSHOT_ROLE that allows to take snapshots
 *  - a PAYABLE_ROLE role that allows authorized addresses to invoke the token splitting payment function (all paybale contracts)
 *  - a TRUSTED_AGENT_ROLE role that allows authorized addresses to transfer and burn tokens (AC_MGR)




 *
 * This contract uses {AccessControl} to lock permissioned functions using the
 * different roles - head to its documentation for details.
 *
 * The account that deploys the contract will be granted the minter and pauser
 * roles, as well as the default admin role, which will let it grant both minter
 * and pauser roles to other accounts.
 */
contract UTIL_TKN is
    Context,
    AccessControl,
    ERC20Burnable,
    Pausable,
    ERC20Snapshot
{
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");
    bytes32 public constant PAYABLE_ROLE = keccak256("PAYABLE_ROLE");
    bytes32 public constant TRUSTED_AGENT_ROLE = keccak256(
        "TRUSTED_AGENT_ROLE"
    );

    using SafeMath for uint256;

    uint256 private _cap = 4000000000000000000000000000; //4billion max supply

    address private sharesAddress = address(0);

    struct Invoice {
        //invoice struct to facilitate payment messaging in-contract
        address rootAddress;
        uint256 rootPrice;
        address ACTHaddress;
        uint256 ACTHprice;
    }

    uint256 trustedAgentEnabled = 1;

    mapping(address => uint256) private coldWallet;

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
     * account that deploys the contract.
     *
     * See {ERC20-constructor}.
     */
    constructor() public ERC20("PRüF Network", "PRUF") {
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(PAUSER_ROLE, _msgSender());
    }

    //------------------------------------------------------------------------MODIFIERS

    /*
     * @dev Verify user credentials
     * Originating Address:
     *      is Admin
     */
    modifier isAdmin() {
        require(
            hasRole(DEFAULT_ADMIN_ROLE, _msgSender()),
            "PRuF:MOD: must have DEFAULT_ADMIN_ROLE"
        );
        _;
    }

    /*
     * @dev Verify user credentials
     * Originating Address:
     *      is Pauser
     */
    modifier isPauser() {
        require(
            hasRole(PAUSER_ROLE, _msgSender()),
            "PRuF:MOD: must have PAUSER_ROLE"
        );
        _;
    }

    /*
     * @dev Verify user credentials
     * Originating Address:
     *      is Minter
     */
    modifier isMinter() {
        require(
            hasRole(MINTER_ROLE, _msgSender()),
            "PRuF:MOD: must have MINTER_ROLE"
        );
        _;
    }

    /*
     * @dev Verify user credentials
     * Originating Address:
     *      is Payable in PRuF
     */
    modifier isPayable() {
        require(
            hasRole(PAYABLE_ROLE, _msgSender()),
            "PRuF:MOD: must have PAYABLE_ROLE"
        );
        require( //---------------------------------------------------DPS:TEST : NEW
            trustedAgentEnabled == 1,
            "PRuF:MOD: Trusted Payable Function permanently disabled - use allowance / transferFrom pattern"
        );
        _;
    }

    /*
     * @dev Verify user credentials
     * Originating Address:
     *      is Trusted Agent
     */
    modifier isTrustedAgent() {
        require(
            hasRole(TRUSTED_AGENT_ROLE, _msgSender()),
            "PRuF:MOD: must have TRUSTED_AGENT_ROLE"
        );
        require( //---------------------------------------------------DPS:TEST : NEW
            trustedAgentEnabled == 1,
            "PRuF:MOD: Trusted Agent function permanently disabled - use allowance / transferFrom pattern"
        );
        _;
    }

    /*
     * @dev ----------------------------------------PERMANANTLY !!!  Kills trusted agent and payable functions
     * this will break the functionality of current payment mechanisms.
     *
     * The workaround for this is to create an allowance for pruf contracts for a single or multiple payments,
     * either ahead of time "loading up your PRUF account" or on demand with an operation. On demand will use quite a bit more gas.
     * "preloading" should be pretty gas efficient, but will add an extra step to the workflow, requiring users to have sufficient
     * PRuF "banked" in an allowance for use in the system.
     *
     */
    function adminKillTrustedAgent(uint256 _key) external isAdmin {
        //---------------------------------------------------DPS:TEST : NEW
        if (_key == 170) {
            trustedAgentEnabled = 0; //-------------------THIS IS A PERMANENT ACTION AND CANNOT BE UNDONE
        }
    }

    /*
     * @dev Set calling wallet to a "cold Wallet" that cannot be manipulated by TRUSTED_AGENT or PAYABLE permissioned functions
     * WALLET ADDRESSES SET TO "Cold" DO NOT WORK WITH TRUSTED_AGENT FUNCTIONS and must be unset from cold before it can interact with
     * contract functions.
     */
    function setColdWallet() external {
        //---------------------------------------------------DPS:TEST : NEW
        coldWallet[_msgSender()] = 170;
    }

    /*
     * @dev un-set calling wallet to a "cold Wallet", enabling manipulation by TRUSTED_AGENT and PAYABLE permissioned functions
     * WALLET ADDRESSES SET TO "Cold" DO NOT WORK WITH TRUSTED_AGENT FUNCTIONS and must be unset from cold before it can interact with
     * contract functions.
     */
    function unSetColdWallet() external {
        //---------------------------------------------------DPS:TEST : NEW
        coldWallet[_msgSender()] = 0;
    }

    /*
     * @dev return an adresses "cold wallet" status
     * WALLET ADDRESSES SET TO "Cold" DO NOT WORK WITH TRUSTED_AGENT FUNCTIONS
     */
    function isColdWallet(address _addr) external view returns (uint256) {
        return coldWallet[_addr];
    }

    /*
     * @dev Set address of SHARES payment contract. by default contract will use root address instead if set to zero.
     */
    function AdminSetSharesAddress(address _paymentAddress) external isAdmin {
        require(
            _paymentAddress != address(0),
            "PRuF:SSA: payment address cannot be zero"
        );

        //^^^^^^^checks^^^^^^^^^

        sharesAddress = _paymentAddress;
        //^^^^^^^effects^^^^^^^^^
    }

    /*
     * @dev Deducts token payment from transaction
     */
    function payForService(
        address _senderAddress,
        address _rootAddress,
        uint256 _rootPrice,
        address _ACTHaddress,
        uint256 _ACTHprice
    ) external isPayable {
        require( //---------------------------------------------------DPS:TEST : NEW
            coldWallet[_senderAddress] == 0,
            "PRuF:PFS: Cold Wallet - Trusted payable functions prohibited"
        );
        require( //redundant? throws on transfer?
            balanceOf(_senderAddress) >= _rootPrice.add(_ACTHprice),
            "PRuF:PFS: insufficient balance"
        );
        //^^^^^^^checks^^^^^^^^^

        if (sharesAddress == address(0)) {
            //IF SHARES ADDRESS IS NOT SET
            _transfer(_senderAddress, _rootAddress, _rootPrice);
            _transfer(_senderAddress, _ACTHaddress, _ACTHprice);
        } else {
            //IF SHARES ADDRESS IS SET
            uint256 sharesShare = _rootPrice.div(uint256(4)); // sharesShare is 0.25 share of root costs
            uint256 rootShare = _rootPrice.sub(sharesShare); // adjust root price to be root price - 0.25 share

            _transfer(_senderAddress, _rootAddress, rootShare);
            _transfer(_senderAddress, sharesAddress, sharesShare);
            _transfer(_senderAddress, _ACTHaddress, _ACTHprice);
        }
        //^^^^^^^effects / interactions^^^^^^^^^
    }

    /*
     * @dev arbitrary burn (requires TRUSTED_AGENT_ROLE)   ****USE WITH CAUTION
     */
    function trustedAgentBurn(address _addr, uint256 _amount)
        public
        isTrustedAgent
    {
        require( //---------------------------------------------------DPS:TEST : NEW
            coldWallet[_addr] == 0,
            "PRuF:BRN: Cold Wallet - Trusted functions prohibited"
        );
        //^^^^^^^checks^^^^^^^^^
        _burn(_addr, _amount);
        //^^^^^^^effects^^^^^^^^^
    }

    /*
     * @dev arbitrary transfer (requires TRUSTED_AGENT_ROLE)   ****USE WITH CAUTION
     */
    function trustedAgentTransfer(
        address _from,
        address _to,
        uint256 _amount
    ) public isTrustedAgent {
        require( //---------------------------------------------------DPS:TEST : NEW
            coldWallet[_from] == 0,
            "PRuF:TAT: Cold Wallet - Trusted functions prohibited"
        );
        //^^^^^^^checks^^^^^^^^^
        _transfer(_from, _to, _amount);
        //^^^^^^^effects^^^^^^^^^
    }

    /*
     * @dev Take a balance snapshot, returns snapshot ID
     */
    function takeSnapshot() external returns (uint256) {
        require(
            hasRole(SNAPSHOT_ROLE, _msgSender()),
            "ERC20PresetMinterPauser: must have snapshot role to take a snapshot"
        );
        return _snapshot();
    }

    /**
     * @dev Creates `_amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 _amount) public virtual {
        require(
            hasRole(MINTER_ROLE, _msgSender()),
            "PRuF:MOD: must have MINTER_ROLE"
        );
        //^^^^^^^checks^^^^^^^^^

        _mint(to, _amount);
        //^^^^^^^interactions^^^^^^^^^
    }

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() public virtual isPauser {
        //^^^^^^^checks^^^^^^^^^
        _pause();
        //^^^^^^^effects^^^^^^^^
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() public virtual isPauser {
        //^^^^^^^checks^^^^^^^^^
        _unpause();
        //^^^^^^^effects^^^^^^^^
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view returns (uint256) {
        return _cap;
    }

    /**
     * @dev all paused functions are blocked here, unless caller has "pauser" role
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override(ERC20, ERC20Snapshot) {
        super._beforeTokenTransfer(from, to, amount);

        require(
            (!paused()) || hasRole(PAUSER_ROLE, _msgSender()),
            "ERC20Pausable: function unavailble while contract is paused"
        );
        if (from == address(0)) {
            // When minting tokens
            require(
                totalSupply().add(amount) <= _cap,
                "ERC20Capped: cap exceeded"
            );
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./EnumerableSet.sol";
import "./Address.sol";
import "./Context.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Math.sol";

/**
 * @dev Collection of functions related to array types.
 */
library Arrays {
   /**
     * @dev Searches a sorted `array` and returns the first index that contains
     * a value greater or equal to `element`. If no such index exists (i.e. all
     * values in the array are strictly less than `element`), the array length is
     * returned. Time complexity O(log n).
     *
     * `array` is expected to be sorted in ascending order, and to contain no
     * repeated elements.
     */
    function findUpperBound(uint256[] storage array, uint256 element) internal view returns (uint256) {
        if (array.length == 0) {
            return 0;
        }

        uint256 low = 0;
        uint256 high = array.length;

        while (low < high) {
            uint256 mid = Math.average(low, high);

            // Note that mid will always be strictly less than high (i.e. it will be a valid array index)
            // because Math.average rounds down (it does integer division with truncation).
            if (array[mid] > element) {
                high = mid;
            } else {
                low = mid + 1;
            }
        }

        // At this point `low` is the exclusive upper bound. We will return the inclusive upper bound.
        if (low > 0 && array[low - 1] == element) {
            return low - 1;
        } else {
            return low;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./SafeMath.sol";

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Context.sol";
import "./IERC20.sol";
import "./SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./SafeMath.sol";
import "./Arrays.sol";
import "./Counters.sol";
import "./ERC20.sol";

/**
 * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and
 * total supply at the time are recorded for later access.
 *
 * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.
 * In naive implementations it's possible to perform a "double spend" attack by reusing the same balance from different
 * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be
 * used to create an efficient ERC20 forking mechanism.
 *
 * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a
 * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot
 * id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id
 * and the account address.
 *
 * ==== Gas Costs
 *
 * Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log
 * n)_ in the number of snapshots that have been created, although _n_ for a specific account will generally be much
 * smaller since identical balances in subsequent snapshots are stored as a single entry.
 *
 * There is a constant overhead for normal ERC20 transfers due to the additional snapshot bookkeeping. This overhead is
 * only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent
 * transfers will have normal cost until the next snapshot, and so on.
 */
abstract contract ERC20Snapshot is ERC20 {
    // Inspired by Jordi Baylina's MiniMeToken to record historical balances:
    // https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol

    using SafeMath for uint256;
    using Arrays for uint256[];
    using Counters for Counters.Counter;

    // Snapshotted values have arrays of ids and the value corresponding to that id. These could be an array of a
    // Snapshot struct, but that would impede usage of functions that work on an array.
    struct Snapshots {
        uint256[] ids;
        uint256[] values;
    }

    mapping (address => Snapshots) private _accountBalanceSnapshots;
    Snapshots private _totalSupplySnapshots;

    // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid.
    Counters.Counter private _currentSnapshotId;

    /**
     * @dev Emitted by {_snapshot} when a snapshot identified by `id` is created.
     */
    event Snapshot(uint256 id);

    /**
     * @dev Creates a new snapshot and returns its snapshot id.
     *
     * Emits a {Snapshot} event that contains the same id.
     *
     * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a
     * set of accounts, for example using {AccessControl}, or it may be open to the public.
     *
     * [WARNING]
     * ====
     * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,
     * you must consider that it can potentially be used by attackers in two ways.
     *
     * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow
     * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target
     * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs
     * section above.
     *
     * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.
     * ====
     */
    function _snapshot() internal virtual returns (uint256) {
        _currentSnapshotId.increment();

        uint256 currentId = _currentSnapshotId.current();
        emit Snapshot(currentId);
        return currentId;
    }

    /**
     * @dev Retrieves the balance of `account` at the time `snapshotId` was created.
     */
    function balanceOfAt(address account, uint256 snapshotId) public view returns (uint256) {
        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _accountBalanceSnapshots[account]);

        return snapshotted ? value : balanceOf(account);
    }

    /**
     * @dev Retrieves the total supply at the time `snapshotId` was created.
     */
    function totalSupplyAt(uint256 snapshotId) public view returns(uint256) {
        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshots);

        return snapshotted ? value : totalSupply();
    }


    // Update balance and/or total supply snapshots before the values are modified. This is implemented
    // in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
      super._beforeTokenTransfer(from, to, amount);

      if (from == address(0)) {
        // mint
        _updateAccountSnapshot(to);
        _updateTotalSupplySnapshot();
      } else if (to == address(0)) {
        // burn
        _updateAccountSnapshot(from);
        _updateTotalSupplySnapshot();
      } else {
        // transfer
        _updateAccountSnapshot(from);
        _updateAccountSnapshot(to);
      }
    }

    function _valueAt(uint256 snapshotId, Snapshots storage snapshots)
        private view returns (bool, uint256)
    {
        require(snapshotId > 0, "ERC20Snapshot: id is 0");
        // solhint-disable-next-line max-line-length
        require(snapshotId <= _currentSnapshotId.current(), "ERC20Snapshot: nonexistent id");

        // When a valid snapshot is queried, there are three possibilities:
        //  a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never
        //  created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds
        //  to this id is the current one.
        //  b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the
        //  requested id, and its value is the one to return.
        //  c) More snapshots were created after the requested one, and the queried value was later modified. There will be
        //  no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is
        //  larger than the requested one.
        //
        // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if
        // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does
        // exactly this.

        uint256 index = snapshots.ids.findUpperBound(snapshotId);

        if (index == snapshots.ids.length) {
            return (false, 0);
        } else {
            return (true, snapshots.values[index]);
        }
    }

    function _updateAccountSnapshot(address account) private {
        _updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account));
    }

    function _updateTotalSupplySnapshot() private {
        _updateSnapshot(_totalSupplySnapshots, totalSupply());
    }

    function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private {
        uint256 currentId = _currentSnapshotId.current();
        if (_lastSnapshotId(snapshots.ids) < currentId) {
            snapshots.ids.push(currentId);
            snapshots.values.push(currentValue);
        }
    }

    function _lastSnapshotId(uint256[] storage ids) private view returns (uint256) {
        if (ids.length == 0) {
            return 0;
        } else {
            return ids[ids.length - 1];
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

/*--------------------------------------------------------PRuF0.7.1
__/\\\\\\\\\\\\\ _____/\\\\\\\\\ _______/\\./\\ ___/\\\\\\\\\\\\\\\
 _\/\\\/////////\\\ _/\\\///////\\\ ____\//..\//____\/\\\///////////__
  _\/\\\.......\/\\\.\/\\\.....\/\\\ ________________\/\\\ ____________
   _\/\\\\\\\\\\\\\/__\/\\\\\\\\\\\/_____/\\\____/\\\.\/\\\\\\\\\\\ ____
    _\/\\\/////////____\/\\\//////\\\ ___\/\\\___\/\\\.\/\\\///////______
     _\/\\\ ____________\/\\\ ___\//\\\ __\/\\\___\/\\\.\/\\\ ____________
      _\/\\\ ____________\/\\\ ____\//\\\ _\/\\\___\/\\\.\/\\\ ____________
       _\/\\\ ____________\/\\\ _____\//\\\.\//\\\\\\\\\ _\/\\\ ____________
        _\/// _____________\/// _______\/// __\///////// __\/// _____________
         *-------------------------------------------------------------------*/

/*-----------------------------------------------------------------
 *  TO DO
 *
 *---------------------------------------------------------------*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.7;

/*
 * @dev Interface for UTIL_TKN
 * INHERIANCE:
    import "./AccessControl.sol";
    import "./ERC20.sol";
    import "./ERC20Burnable.sol";
    import "./ERC20Pausable.sol";
    import "./ERC20Snapshot.sol";
 */
interface UTIL_TKN_Interface {

    /*
     * @dev PERMENANTLY !!!  Kill trusted agent and payable
     */
    function killTrustedAgent(uint256 _key) external;

    /*
     * @dev Set calling wallet to a "cold Wallet" that cannot be manipulated by TRUSTED_AGENT or PAYABLE permissioned functions
     */
    function setColdWallet() external;

    /*
     * @dev un-set calling wallet to a "cold Wallet", enabling manipulation by TRUSTED_AGENT and PAYABLE permissioned functions
     */
    function unSetColdWallet() external;

    /*
     * @dev return an adresses "cold wallet" status
     */
    function isColdWallet (address _addr) external returns (uint256);
   

    /*
     * @dev Set adress of payment contract
     */
    function AdminSetSharesAddress(address _paymentAddress) external;


    /*
     * @dev Deducts token payment from transaction
     * Requirements:
     * - the caller must have PAYABLE_ROLE.
     * - the caller must have a pruf token balance of at least `_rootPrice + _ACTHprice`.
     */
    function payForService(
        address _senderAddress,
        address _rootAddress,
        uint256 _rootPrice,
        address _ACTHaddress,
        uint256 _ACTHprice
    ) external;

    /*
     * @dev arbitrary burn (requires TRUSTED_AGENT_ROLE)   ****USE WITH CAUTION
     */
    function trustedAgentBurn(address _addr, uint256 _amount) external;

    /*
     * @dev arbitrary transfer (requires TRUSTED_AGENT_ROLE)   ****USE WITH CAUTION
     */
    function trustedAgentTransfer(
        address _from,
        address _to,
        uint256 _amount
    ) external;

    /*
     * @dev Take a balance snapshot, returns snapshot ID
     * - the caller must have the `SNAPSHOT_ROLE`.
     */
    function takeSnapshot() external returns (uint256);

    /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) external;

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() external;

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() external;

    /**
     * @dev Retrieves the balance of `account` at the time `snapshotId` was created.
     */
    function balanceOfAt(address account, uint256 snapshotId)
        external
        returns (uint256);

    /**
     * @dev Retrieves the total supply at the time `snapshotId` was created.
     */
    function totalSupplyAt(uint256 snapshotId) external returns (uint256);

   

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) external returns (bool); 
    

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external; 

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) external;

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() external returns (uint256);

        /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external returns (bool);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external returns (uint256);

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external returns (address);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
       
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for AC_TKN
 * INHERIANCE:
    import "./ERC721/ERC721.sol";
    import "./Ownable.sol";
    import "./ReentrancyGuard.sol";
 */
interface AC_TKN_Interface {
    /*
     * @dev Set storage contract to interface with
     */
    function OO_setStorageContract(address _storageAddress) external;

    /*
     * @dev Address Setters
     */
    function OO_resolveContractAddresses() external;

    /*
     * @dev Mints assetClass token, must be isAdmin
     */
    function mintACToken(
        address _recipientAddress,
        uint256 tokenId,
        string calldata _tokenURI
    ) external returns (uint256);

    /*
     * @dev remint Asset Token
     * must set a new and unuiqe rgtHash
     * burns old token
     * Sends new token to original Caller
     */
    function reMintACToken(
        address _recipientAddress,
        uint256 tokenId,
        string calldata _tokenURI
    ) external returns (uint256);

    /**
     * @dev Transfers the ownership of a given token ID to another address.
     * Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the _msgSender() to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata _data
    ) external;

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId)
        external
        view
        returns (address tokenHolderAdress);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external returns (uint256);

    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory tokenName);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory tokenSymbol);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId)
        external
        view
        returns (string memory URI);

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        external
        view
        returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for A_TKN
 * INHERIANCE:
    import "./ERC721/ERC721.sol";
    import "./Ownable.sol";
    import "./ReentrancyGuard.sol";
 */
interface A_TKN_Interface {
    /*
     * @dev Set storage contract to interface with
     */
    function OO_setStorageContract(address _storageAddress) external;

    /*
     * @dev Address Setters
     */
    function OO_resolveContractAddresses() external;

    /*
     * @dev Mint new asset token
     */
    function mintAssetToken(
        address _recipientAddress,
        uint256 tokenId,
        string calldata _tokenURI
    ) external returns (uint256);

    /*
     * @dev remint Asset Token
     * must set a new and unuiqe rgtHash
     * burns old token
     * Sends new token to original Caller
     */
    function reMintAssetToken(address _recipientAddress, uint256 tokenId)
        external
        returns (uint256);

    /*
     * @dev Set new token URI String
     */
    function setURI(uint256 tokenId, string calldata _tokenURI)
        external
        returns (uint256);

    /*
     * @dev Reassures user that token is minted in the PRUF system
     */
    function validatePipToken(
        uint256 tokenId,
        uint32 _assetClass,
        string calldata _authCode
    ) external view;

    /*
     * @dev See if token exists
     */
    function tokenExists(uint256 tokenId) external view returns (uint8);

    /**
     * @dev Transfers the ownership of a given token ID to another address.
     * Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the _msgSender() to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata _data
    ) external;

    /**
     * @dev Safely burns a token and sets the corresponding RGT to zero in storage.
     */
    function discard(uint256 tokenId) external;

    /**
     * @dev Converts uint256 to string form @OpenZeppelin.
     */
    function uint256toString(uint256 number) external returns (string memory);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId)
        external
        returns (address tokenHolderAdress);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external returns (uint256);

    /**
     * @dev Returns the name of the token.
     */
    function name() external returns (string memory tokenName);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external returns (string memory tokenSymbol);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external returns (string memory URI);

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        external
        returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external returns (uint256);
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for ID_TKN
 * INHERIANCE:
    import "./ERC721/ERC721.sol";
    import "./Ownable.sol";
    import "./ReentrancyGuard.sol";
 */
interface ID_TKN_Interface {
    /*
     * @dev Mint new PRUF_ID token
     */
    function mintPRUF_IDToken(address _recipientAddress, uint256 tokenId)
        external
        returns (uint256);

    /*
     * @dev remint Asset Token
     * must set a new and unuiqe rgtHash
     * burns old token
     * Sends new token to original Caller
     */
    function reMintPRUF_IDToken(address _recipientAddress, uint256 tokenId)
        external
        returns (uint256);

    /*
     * @dev See if token exists
     */
    function tokenExists(uint256 tokenId) external view returns (uint8);

    /**
     * @dev @dev Blocks the transfer of a given token ID to another address
     * Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely blocks the transfer of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Safely blocks the transfer of a given token ID to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the _msgSender() to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata _data
    ) external;

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId)
        external
        view
        returns (address tokenHolderAdress);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external returns (uint256);

    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory tokenName);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory tokenSymbol);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId)
        external
        view
        returns (string memory URI);

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        external
        view
        returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for AC_MGR
 * INHERIANCE:
    import "./PRUF_BASIC.sol";
    import "./math/Safemath.sol";
 */
interface AC_MGR_Interface {
    /*
     * @dev Authorize / Deauthorize / Authorize users for an address be permitted to make record modifications
     */
    function OO_addUser(
        bytes32 _addrHash,
        uint8 _userType,
        uint32 _assetClass
    ) external;

    /*
     * @dev Mints asset class token and creates an assetClass. Mints to @address
     * Requires that:
     *  name is unuiqe
     *  AC is not provisioned with a root (proxy for not yet registered)
     *  that ACtoken does not exist
     */
    function createAssetClass(
        address _recipientAddress,
        string calldata _name,
        uint32 _assetClass,
        uint32 _assetClassRoot,
        uint8 _custodyType,
        bytes32 _IPFS
    ) external;

    /*
     * @dev Modifies an assetClass
     * Sets a new AC name. Asset Classes cannot be moved to a new root or custody type.
     * Requires that:
     *  caller holds ACtoken
     *  name is unuiqe or same as old name
     */
    function updateACname(string calldata _name, uint32 _assetClass) external;

    /*
     * @dev Modifies an assetClass
     * Sets a new AC IPFS Address. Asset Classes cannot be moved to a new root or custody type.
     * Requires that:
     *  caller holds ACtoken
     */
    function updateACipfs(bytes32 _IPFS, uint32 _assetClass) external;

    /*
     * @dev Set function costs and payment address per asset class, in Wei
     */
    function ACTH_setCosts(
        uint32 _assetClass,
        uint16 _service,
        uint256 _serviceCost,
        address _paymentAddress
    ) external;

    /*
     * @dev get a User Record
     */
    function getUserType(bytes32 _userHash, uint32 _assetClass)
        external
        view
        returns (uint8);

    /*
     * @dev Retrieve AC_data @ _assetClass
     */
    function getAC_data(uint32 _assetClass)
        external
        view
        returns (
            uint32,
            uint8,
            uint32,
            uint32,
            bytes32
        );

    /*
     * @dev Retrieve AC_discount @ _assetClass, in percent ACTH share, * 100 (9000 = 90%)
     */
    function getAC_discount(uint32 _assetClass) external view returns (uint32);

    /*
     * @dev compare the root of two asset classes
     */
    function isSameRootAC(uint32 _assetClass1, uint32 _assetClass2)
        external
        view
        returns (uint8);

    /*
     * @dev Retrieve AC_name @ _tokenId
     */
    function getAC_name(uint32 _tokenId) external view returns (string memory);

    /*
     * @dev Retrieve AC_number @ AC_name
     */
    function resolveAssetClass(string calldata _name)
        external
        view
        returns (uint32);

    /*
     * @dev Retrieve function costs per asset class, per service type, in Wei
     */
    function getServiceCosts(uint32 _assetClass, uint16 _service)
        external
        view
        returns (
            address,
            uint256,
            address,
            uint256
        );
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for STOR
 * INHERIANCE:
    import "./Ownable.sol";
    import "./Pausable.sol";
    import "./math/Safemath.sol";
    import "./ReentrancyGuard.sol";
 */
interface STOR_Interface {
    /*
     * @dev Triggers stopped state. (pausable)
     */
    function pause() external;

    /*
     * @dev Returns to normal state. (pausable)
     */
    function unpause() external;

    /*
     * @dev Authorize / Deauthorize / Authorize ADRESSES permitted to make record modifications, per AssetClass
     * populates contract name resolution and data mappings
     */
    function OO_addContract(
        string calldata _name,
        address _addr,
        uint32 _assetClass,
        uint8 _contractAuthLevel
    ) external;

    /*
     * @dev Authorize / Deauthorize / Authorize contract NAMES permitted to make record modifications, per AssetClass
     * allows ACtokenHolder to auithorize or deauthorize specific contracts to work within their asset class
     */
    function enableContractForAC(
        string calldata _name,
        uint32 _assetClass,
        uint8 _contractAuthLevel
    ) external;

    /*
     * @dev Make a new record, writing to the 'database' mapping with basic initial asset data
     */
    function newRecord(
        bytes32 _idxHash,
        bytes32 _rgtHash,
        uint32 _assetClass,
        uint32 _countDownStart
    ) external;

    /*
     * @dev Modify a record, writing to the 'database' mapping with updates to multiple fields
     */
    function modifyRecord(
        bytes32 _idxHash,
        bytes32 _rgtHash,
        uint8 _newAssetStatus,
        uint32 _countDown,
        uint256 _incrementForceModCount,
        uint256 _incrementNumberOfTransfers
    ) external;

    /*
     * @dev Change asset class of an asset - writes to assetClass in the 'Record' struct of the 'database' at _idxHash
     */
    function changeAC(bytes32 _idxHash, uint32 _newAssetClass) external;

    /*
     * @dev Set an asset to stolen or lost. Allows narrow modification of status 6/12 assets, normally locked
     */
    function setStolenOrLost(bytes32 _idxHash, uint8 _newAssetStatus) external;

    /*
     * @dev Set an asset to escrow locked status (6/50/56).
     */
    function setEscrow(bytes32 _idxHash, uint8 _newAssetStatus) external;

    /*
     * @dev remove an asset from escrow status. Implicitly trusts escrowManager ECR_MGR contract
     */
    function endEscrow(bytes32 _idxHash) external;

    /*
     * @dev Modify record Ipfs1 data
     */
    function modifyIpfs1(bytes32 _idxHash, bytes32 _Ipfs1) external;

    /*
     * @dev Write record Ipfs2 data
     */
    function modifyIpfs2(bytes32 _idxHash, bytes32 _Ipfs2) external;

    /*
     * @dev return a record from the database, including rgt
     */
    function retrieveRecord(bytes32 _idxHash)
        external
        view
        returns (
            bytes32,
            uint8,
            uint32,
            uint32,
            uint32,
            bytes32,
            bytes32
        );

    /*
     * @dev return a record from the database w/o rgt
     */
    function retrieveShortRecord(bytes32 _idxHash)
        external
        view
        returns (
            uint8,
            uint8,
            uint32,
            uint32,
            uint32,
            bytes32,
            bytes32,
            uint16
        );

    /*
     * @dev Compare record.rightsholder with supplied bytes32 rightsholder
     * return 170 if matches, 0 if not
     */
    function _verifyRightsHolder(bytes32 _idxHash, bytes32 _rgtHash)
        external
        view
        returns (uint256);

    /*
     * @dev Compare record.rightsholder with supplied bytes32 rightsholder (writes an emit in blockchain for independant verification)
     */
    function blockchainVerifyRightsHolder(bytes32 _idxHash, bytes32 _rgtHash)
        external
        returns (uint8);

    /*
     * @dev //returns the address of a contract with name _name. This is for web3 implementations to find the right contract to interact with
     * example :  Frontend = ****** so web 3 first asks storage where to find frontend, then calls for frontend functions.
     */
    function resolveContractAddress(string calldata _name)
        external
        view
        returns (address);

    /*
     * @dev //returns the contract type of a contract with address _addr.
     */
    function ContractInfoHash(address _addr, uint32 _assetClass)
        external
        view
        returns (uint8, bytes32);
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for ECR_MGR
 * INHERIANCE:
    import "./PRUF_BASIC.sol";
    import "./math/Safemath.sol";
 */
interface ECR_MGR_Interface {
    /*
     * @dev Set an asset to escrow status (6/50/56). Sets timelock for unix timestamp of escrow end.
     */
    function setEscrow(
        bytes32 _idxHash,
        uint8 _newAssetStatus,
        bytes32 _escrowOwnerAddressHash,
        uint256 _timelock
    ) external;

    /*
     * @dev remove an asset from escrow status
     */
    function endEscrow(bytes32 _idxHash) external;

    /*
     * @dev Set data in EDL mapping
     * Must be setter contract
     * Must be in  escrow
     */
    function setEscrowDataLight(
        bytes32 _idxHash,
        uint8 _escrowData,
        uint8 _u8_1,
        uint8 _u8_2,
        uint8 _u8_3,
        uint16 _u16_1,
        uint16 _u16_2,
        uint32 _u32_1,
        address _addr_1
    ) external;

    /*
     * @dev Set data in EDL mapping
     * Must be setter contract
     * Must be in  escrow
     */
    function setEscrowDataHeavy(
        bytes32 _idxHash,
        uint32 _u32_2,
        uint32 _u32_3,
        uint32 _u32_4,
        address _addr_2,
        bytes32 _b32_1,
        bytes32 _b32_2,
        uint256 _u256_1,
        uint256 _u256_2
    ) external;

    /*
     * @dev Permissive removal of asset from escrow status after time-out
     */
    function permissiveEndEscrow(bytes32 _idxHash) external;

    /*
     * @dev return escrow OwnerHash
     */
    function retrieveEscrowOwner(bytes32 _idxHash)
        external
        returns (bytes32 hashOfEscrowOwnerAdress);

    /*
     * @dev return escrow data @ IDX
     */
    function retrieveEscrowData(bytes32 _idxHash)
        external
        returns (
            bytes32 controllingContractNameHash,
            bytes32 escrowOwnerAddressHash,
            uint256 timelock
        );

    /*
     * @dev return EscrowDataLight @ IDX
     */
    function retrieveEscrowDataLight(bytes32 _idxHash)
        external
        view
        returns (
            uint8 _escrowData,
            uint8 _u8_1,
            uint8 _u8_2,
            uint8 _u8_3,
            uint16 _u16_1,
            uint16 _u16_2,
            uint32 _u32_1,
            address _addr_1
        );

    /*
     * @dev return EscrowDataHeavy @ IDX
     */
    function retrieveEscrowDataHeavy(bytes32 _idxHash)
        external
        view
        returns (
            uint32 _u32_2,
            uint32 _u32_3,
            uint32 _u32_4,
            address _addr_2,
            bytes32 _b32_1,
            bytes32 _b32_2,
            uint256 _u256_1,
            uint256 _u256_2
        );
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for RCLR
 * INHERIANCE:
    import "./PRUF_ECR_CORE.sol";
    import "./PRUF_CORE.sol";
 */
interface RCLR_Interface {
    function discard(bytes32 _idxHash, address _sender) external;

    function recycle(bytes32 _idxHash) external;
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for APP
 * INHERIANCE:
    import "./PRUF_CORE.sol";
 */
interface APP_Interface {
    function transferAssetToken(address _to, bytes32 _idxHash) external;

    function $withdraw() external;
}

//------------------------------------------------------------------------------------------------
/*
 * @dev Interface for APP_NC
 * INHERIANCE:
    import "./PRUF_CORE.sol";
 */
interface APP_NC_Interface {
    function transferAssetToken(address _to, bytes32 _idxHash) external;

    function $withdraw() external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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