Contract

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;

/*
  ______                       _______                             __ 
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|  ▓▓▓▓▓▓\  ______    ______  | ▓▓▓▓▓▓▓\  ______   _______    ____| ▓▓
| ▓▓__| ▓▓ /      \  /      \ | ▓▓__/ ▓▓ /      \ |       \  /      ▓▓
| ▓▓    ▓▓|  ▓▓▓▓▓▓\|  ▓▓▓▓▓▓\| ▓▓    ▓▓|  ▓▓▓▓▓▓\| ▓▓▓▓▓▓▓\|  ▓▓▓▓▓▓▓
| ▓▓▓▓▓▓▓▓| ▓▓  | ▓▓| ▓▓    ▓▓| ▓▓▓▓▓▓▓\| ▓▓  | ▓▓| ▓▓  | ▓▓| ▓▓  | ▓▓
| ▓▓  | ▓▓| ▓▓__/ ▓▓| ▓▓▓▓▓▓▓▓| ▓▓__/ ▓▓| ▓▓__/ ▓▓| ▓▓  | ▓▓| ▓▓__| ▓▓
| ▓▓  | ▓▓| ▓▓    ▓▓ \▓▓     \| ▓▓    ▓▓ \▓▓    ▓▓| ▓▓  | ▓▓ \▓▓    ▓▓
 \▓▓   \▓▓| ▓▓▓▓▓▓▓   \▓▓▓▓▓▓▓ \▓▓▓▓▓▓▓   \▓▓▓▓▓▓  \▓▓   \▓▓  \▓▓▓▓▓▓▓
          | ▓▓                                                        
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           \▓▓                                                         
 * App:             https://Ape.Bond
 * Medium:          https://ApeBond.medium.com
 * Twitter:         https://twitter.com/ApeBond
 * Telegram:        https://t.me/ape_bond
 * Announcements:   https://t.me/ApeBond_news
 * Discord:         https://ApeBond.click/discord
 * Reddit:          https://ApeBond.click/reddit
 * Instagram:       https://instagram.com/ape.bond
 * GitHub:          https://github.com/ApeSwapFinance
 */

import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
import "@ape.swap/contracts/contracts/v0.8/access/PendingOwnableUpgradeable.sol";
import "./interfaces/ICustomBill.sol";


contract CustomTreasury is Initializable, PendingOwnableUpgradeable {
    /* ======== DEPENDENCIES ======== */

    using SafeERC20Upgradeable for IERC20Upgradeable;

    /* ======== STATE VARIABLES ======== */

    IERC20MetadataUpgradeable public payoutToken;

    address public payoutAddress;

    mapping(address => bool) public billContract;

    /* ======== EVENTS ======== */

    event BillContractToggled(address indexed billContract, bool enabled);
    event Deposit(address indexed billContract, uint256 amountPrincipalToken, uint256 amountPayoutToken);
    event PayoutFee(address indexed billContract, address feeReceiver, uint256 amountPayoutToken);
    event Withdraw(address indexed token, address indexed destination, uint256 amount);

    /* ======== CONSTRUCTOR ======== */

    function initialize(IERC20MetadataUpgradeable _payoutToken, address _initialOwner, address _payoutAddress) public initializer {
        require(address(_payoutToken) != address(0), "Payout token cannot address zero");
        payoutToken = _payoutToken;
        require(_initialOwner != address(0), "initialOwner can't address 0");
        __Ownable_init();
        _transferOwnership(_initialOwner);
        require(_payoutAddress != address(0), "payoutAddress can't address 0");
        payoutAddress = _payoutAddress;
    }

    /* ======== BILL CONTRACT FUNCTION ======== */

    /**
     * @notice Access modifier allowing only whitelisted bill contracts
     * @dev Throws if called by any account other than a whitelisted Bill Contract.
     */
    modifier onlyBillContract() {
        require(billContract[msg.sender], "msg.sender not bill contract");
        _;
    }

    /**
     *  @notice deposit principalToken and receive back payoutToken supporting payoutToken fee
     *  @param _principalTokenAddress Address of the principalToken
     *  @param _amountPrincipalToken Amount of principalToken to transfer into the treasury
     *  @param _amountPayoutToken Amount of payoutToken to transfer to Bill Contract (msg.sender)
     */
    function deposit(
        IERC20Upgradeable _principalTokenAddress,
        uint256 _amountPrincipalToken,
        uint256 _amountPayoutToken
    ) external onlyBillContract() {
        _deposit(_principalTokenAddress, _amountPrincipalToken, _amountPayoutToken, 0, address(0));
    }

    /**
     *  @notice deposit principalToken and receive back payoutToken supporting payoutToken fee
     *  @param _principalTokenAddress Address of the principalToken
     *  @param _amountPrincipalToken Amount of principalToken to transfer into the treasury
     *  @param _amountPayoutToken Amount of payoutToken to transfer to Bill Contract (msg.sender)
     *  @param _feePayoutToken Amount of payoutToken to transfer as a fee
     *  @param _feeReceiver Address which Receives the payoutToken fee 
     */
    function deposit_FeeInPayout(
        IERC20Upgradeable _principalTokenAddress,
        uint256 _amountPrincipalToken,
        uint256 _amountPayoutToken,
        uint256 _feePayoutToken,
        address _feeReceiver
    ) external onlyBillContract() {
        _deposit(_principalTokenAddress, _amountPrincipalToken, _amountPayoutToken, _feePayoutToken, _feeReceiver);
    }

    /**
     *  @notice deposit principalToken and receive back payoutToken supporting payoutToken fee
     *  @param _principalTokenAddress Address of the principalToken
     *  @param _amountPrincipalToken Amount of principalToken to transfer into the treasury
     *  @param _amountPayoutToken Amount of payoutToken to transfer to Bill Contract (msg.sender)
     *  @param _feePayoutToken Amount of payoutToken to transfer as a fee
     *  @param _feeReceiver Address which Receives the payoutToken fee 
     */
    function _deposit(
        IERC20Upgradeable _principalTokenAddress,
        uint256 _amountPrincipalToken,
        uint256 _amountPayoutToken,
        uint256 _feePayoutToken,
        address _feeReceiver
    ) internal {
        _principalTokenAddress.safeTransferFrom(
            msg.sender,
            payoutAddress,
            _amountPrincipalToken
        );
        if(_feePayoutToken > 0) {
            require(_feeReceiver != address(0), "Fee cannot be sent to address(0)");
            IERC20Upgradeable(payoutToken).safeTransfer(_feeReceiver, _feePayoutToken);
            // Transferring directly from Bill to receiver to support fee-on-transfer tokens
            emit PayoutFee(msg.sender, _feeReceiver, _feePayoutToken);
        }
        IERC20Upgradeable(payoutToken).safeTransfer(msg.sender, _amountPayoutToken);
        emit Deposit(msg.sender, _amountPrincipalToken, _amountPayoutToken);
    }

    /* ======== VIEW FUNCTION ======== */

    /**
     *   @notice returns payoutToken valuation of principal
     *   @dev There is a limitation of this function when payoutToken decimals are too small
     *    compared to principalToken decimals. Recommend scaling _amount by 1e18.
     *   @param _principalTokenAddress principal token address 
     *   @param _amount uint principal token amount
     *   @return value_ uint Convert amount from principal decimals to payout decimals
     */
    function valueOfToken(IERC20MetadataUpgradeable _principalTokenAddress, uint256 _amount)
        external
        view
        returns (uint256 value_)
    {
        // convert amount to match payout token decimals
        value_ = (_amount * 10 ** payoutToken.decimals()) / 
        (10 ** _principalTokenAddress.decimals());
    }

    /* ======== OWNER FUNCTIONS ======== */

    /**
     *  @notice owner can withdraw ERC20 token to desired address
     *  @param _token address
     *  @param _destination address
     *  @param _amount uint
     */
    function withdraw(
        address _token,
        address _destination,
        uint256 _amount
    ) external onlyOwner {
        IERC20Upgradeable(_token).safeTransfer(_destination, _amount);

        emit Withdraw(_token, _destination, _amount);
    }

    /**
        @notice toggle bill contract
        @param _billContract Address of CustomBill
        @param _isActive Set the active state of the bill
     */
    function toggleBillContract(address _billContract, bool _isActive) external onlyOwner {
        bool isBillActive = billContract[_billContract];
        require(_isActive != isBillActive, "Bill state not changed");
        if(_isActive) {
            require(address(ICustomBill(_billContract).customTreasury()) == address(this), "Treasury address mismatch");
            require(ICustomBill(_billContract).payoutToken() == payoutToken, "Payout token address mismatch");
        }
        billContract[_billContract] = _isActive;
        emit BillContractToggled(_billContract, _isActive);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract PendingOwnableUpgradeable is OwnableUpgradeable {
    address private _pendingOwner;

    event SetPendingOwner(address indexed pendingOwner);

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev This function is disabled to in place of setPendingOwner()
     */
    function transferOwnership(
        address /*newOwner*/
    ) public view override onlyOwner {
        revert("PendingOwnable: MUST setPendingOwner()");
    }

    /**
     * @dev Sets an account as the pending owner (`newPendingOwner`).
     * Can only be called by the current owner.
     */
    function setPendingOwner(address newPendingOwner) public virtual onlyOwner {
        _pendingOwner = newPendingOwner;
        emit SetPendingOwner(_pendingOwner);
    }

    /**
     * @dev Transfers ownership to the pending owner
     * Can only be called by the pending owner.
     */
    function acceptOwnership() public virtual {
        require(msg.sender == _pendingOwner, "PendingOwnable: MUST be pendingOwner");
        _pendingOwner = address(0);
        _transferOwnership(msg.sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20Upgradeable token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && AddressUpgradeable.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    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 v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
import "./ICustomTreasury.sol";
import "./IVestingCurve.sol";

interface ICustomBill {
    /// @notice Info for bill holder
    /// @param payout Total payout value
    /// @param payoutClaimed Amount of payout claimed
    /// @param vesting Seconds left until vesting is complete
    /// @param vestingTerm Length of vesting in seconds
    /// @param vestingStartTimestamp Timestamp at start of vesting
    /// @param lastClaimTimestamp Last timestamp interaction
    /// @param truePricePaid Price paid (principal tokens per payout token) in ten-millionths - 4000000 = 0.4
    struct Bill {
        uint256 payout; 
        uint256 payoutClaimed;
        uint256 vesting;
        uint256 vestingTerm; 
        uint256 vestingStartTimestamp;
        uint256 lastClaimTimestamp; 
        uint256 truePricePaid; 
    }

    struct BillCreationDetails {
        address payoutToken;
        address principalToken;
        address initialOwner;
        IVestingCurve vestingCurve;
        uint256[] tierCeilings;
        uint256[] fees;
        uint256 startVestingTimestamp;
        bool feeInPayout;
    }

    struct BillTerms {
        uint256 controlVariable;
        uint256 vestingTerm;
        uint256 minimumPrice;
        uint256 maxPayout;
        uint256 maxDebt;
        uint256 maxTotalPayout;
        uint256 initialDebt;
    }

    /// @notice Important accounts related to a CustomBill 
    /// @param feeTo Account which receives the bill fees
    /// @param DAO Account used to change the treasury address
    /// @param billNft BillNFT contract which mints the NFTs
    struct BillAccounts {
        address feeTo;
        address DAO;
        address billNft;
    }

    function initialize(
        ICustomTreasury _customTreasury,
        BillCreationDetails memory _billCreationDetails,
        BillTerms memory _billTerms,
        BillAccounts memory _billAccounts
    ) external;

    function customTreasury() external returns (ICustomTreasury);

    function claim(uint256 billId) external returns (uint256);

    function pendingVesting(uint256 billId) external view returns (uint256);

    function pendingPayout(uint256 billId) external view returns (uint256);

    function vestingPeriod(uint256 billId) external view returns (uint256 vestingStart_, uint256 vestingEnd_);

    function vestingPayout(uint256 billId) external view returns (uint256 vestingPayout_);

    function vestedPayoutAtTime(uint256 billId, uint256 timestamp) external view returns (uint256 vestedPayout_);

    function claimablePayout(uint256 billId) external view returns (uint256 claimablePayout_);

    function payoutToken() external view returns (IERC20MetadataUpgradeable);
    
    function principalToken() external view returns (IERC20MetadataUpgradeable);

    function getBillInfo(uint256 billId) external view returns (Bill memory);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;

interface ICustomTreasury {
    function deposit(
        address _principalTokenAddress,
        uint256 _amountPrincipalToken,
        uint256 _amountPayoutToken
    ) external;

    function deposit_FeeInPayout(
        address _principalTokenAddress,
        uint256 _amountPrincipalToken,
        uint256 _amountPayoutToken,
        uint256 _feePayoutToken,
        address _feeReceiver
    ) external;

    function initialize(address _payoutToken, address _initialOwner, address _payoutAddress) external;

    function valueOfToken(address _principalTokenAddress, uint256 _amount)
        external
        view
        returns (uint256 value_);

   function payoutToken()
        external
        view
        returns (address token);
    
    function sendPayoutTokens(uint _amountPayoutToken) external;

    function billContract(address _billContract) external returns (bool _isEnabled);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;

/// @notice VestingCurve interface to allow for simple updates of vesting release schedules.
interface IVestingCurve {
    /**
     * @notice Returns the vested token amount given the inputs below.
     * @param totalPayout Total payout vested once the vestingTerm is up
     * @param vestingTerm Length of time in seconds that tokens are vesting for
     * @param startTimestamp The timestamp of when vesting starts
     * @param checkTimestamp The timestamp to calculate vested tokens
     * @return vestedPayout Total payoutTokens vested at checkTimestamp
     *
     * Requirements
     * - MUST return 0 if checkTimestamp is less than startTimestamp
     * - MUST return totalPayout if checkTimestamp is greater than startTimestamp + vestingTerm,
     * - MUST return a value including or between 0 and totalPayout
     */
    function getVestedPayoutAtTime(
        uint256 totalPayout,
        uint256 vestingTerm,
        uint256 startTimestamp,
        uint256 checkTimestamp
    ) external view returns (uint256 vestedPayout);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"billContract","type":"address"},{"indexed":false,"internalType":"bool","name":"enabled","type":"bool"}],"name":"BillContractToggled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"billContract","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountPrincipalToken","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountPayoutToken","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"billContract","type":"address"},{"indexed":false,"internalType":"address","name":"feeReceiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountPayoutToken","type":"uint256"}],"name":"PayoutFee","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"pendingOwner","type":"address"}],"name":"SetPendingOwner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"destination","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"billContract","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable","name":"_principalTokenAddress","type":"address"},{"internalType":"uint256","name":"_amountPrincipalToken","type":"uint256"},{"internalType":"uint256","name":"_amountPayoutToken","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable","name":"_principalTokenAddress","type":"address"},{"internalType":"uint256","name":"_amountPrincipalToken","type":"uint256"},{"internalType":"uint256","name":"_amountPayoutToken","type":"uint256"},{"internalType":"uint256","name":"_feePayoutToken","type":"uint256"},{"internalType":"address","name":"_feeReceiver","type":"address"}],"name":"deposit_FeeInPayout","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20MetadataUpgradeable","name":"_payoutToken","type":"address"},{"internalType":"address","name":"_initialOwner","type":"address"},{"internalType":"address","name":"_payoutAddress","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"payoutAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"payoutToken","outputs":[{"internalType":"contract IERC20MetadataUpgradeable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newPendingOwner","type":"address"}],"name":"setPendingOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_billContract","type":"address"},{"internalType":"bool","name":"_isActive","type":"bool"}],"name":"toggleBillContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20MetadataUpgradeable","name":"_principalTokenAddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"valueOfToken","outputs":[{"internalType":"uint256","name":"value_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_destination","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]