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Outline

• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• interface IERC165
•    - function supportsInterface(bytes4 int ...
• interface IERC1155Receiver is IERC165
•    - function onERC1155Received(
•    - function onERC1155BatchReceived(
•  contract ERC165 is IERC165
•    - function supportsInterface(bytes4 int ...
•    - function _registerInterface(bytes4 in ...
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b, st ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function _functionCallWithValue(addre ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function _callOptionalReturn(IERC20 t ...
• library EnumerableMap
•    - function _set(Map storage map, bytes3 ...
•    - function _remove(Map storage map, byt ...
•    - function _contains(Map storage map, b ...
•    - function _length(Map storage map)
•    - function _at(Map storage map, uint256 ...
•    - function _get(Map storage map, bytes3 ...
•    - function _get(Map storage map, bytes3 ...
•    - function set(UintToAddressMap storage ...
•    - function remove(UintToAddressMap stor ...
•    - function contains(UintToAddressMap st ...
•    - function length(UintToAddressMap stor ...
•    - function at(UintToAddressMap storage ...
•    - function get(UintToAddressMap storage ...
•    - function get(UintToAddressMap storage ...
•  contract ReentrancyGuard
• library Math
•    - function max(uint256 a, uint256 b)
•    - function min(uint256 a, uint256 b)
•    - function average(uint256 a, uint256 b ...
•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
• interface IAlpaToken is IERC20
•    - function mint(address _to, uint256 _a ...
• interface IAlpaSupplier
•    - function distribute(uint256 _since)
•    - function preview(address _consumer, u ...
• interface IERC1155 is IERC165
•    - function balanceOf(address account, u ...
•    - function balanceOfBatch(address[] cal ...
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address acc ...
•    - function safeTransferFrom(address fro ...
•    - function safeBatchTransferFrom(addres ...
• interface ICryptoAlpaca is IERC1155
•    - function getAlpaca(uint256 _id)
•    - function hasPermissionToBreedAsSire(a ...
•    - function grandPermissionToBreed(addre ...
•    - function clearPermissionToBreed(uint2 ...
•    - function hatch(uint256 _matronId, uin ...
•    - function crack(uint256 _id)
• interface ICryptoAlpacaEnergyListener ...
•    - function onCryptoAlpacaEnergyChanged(
•  contract AlpacaFarm is *
•    - function pendingAlpa(address _user)
•    - function updatePool()
•    - function retrieve()
•    - function deposit(uint256 _amount)
•    - function withdraw(uint256 _amount)
•    - function emergencyWithdraw()
•    - function _safeUserAlpacaEnergy(UserIn ...
•    - function _safeAlpaTransfer(address _t ...
•    - function onERC1155Received(
•    - function onERC1155BatchReceived(
•    - function onCryptoAlpacaEnergyChanged(

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/**
 *Submitted for verification at Etherscan.io on 2020-11-08
*/

// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol

// 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);
}


// Dependency file: @openzeppelin/contracts/introspection/IERC165.sol


// pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}


// Dependency file: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol


// pragma solidity ^0.6.0;

// import "@openzeppelin/contracts/introspection/IERC165.sol";

/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}


// Dependency file: @openzeppelin/contracts/introspection/ERC165.sol


// pragma solidity ^0.6.0;

// import "@openzeppelin/contracts/introspection/IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}


// Dependency file: @openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol


// pragma solidity ^0.6.0;

// import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
// import "@openzeppelin/contracts/introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    constructor() public {
        _registerInterface(
            ERC1155Receiver(0).onERC1155Received.selector ^
            ERC1155Receiver(0).onERC1155BatchReceived.selector
        );
    }
}


// Dependency file: @openzeppelin/contracts/math/SafeMath.sol


// 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;
    }
}


// Dependency file: @openzeppelin/contracts/utils/Address.sol


// 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 in 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

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


// Dependency file: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


// pragma solidity ^0.6.0;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/math/SafeMath.sol";
// import "@openzeppelin/contracts/utils/Address.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 SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 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(IERC20 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'
        // solhint-disable-next-line max-line-length
        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));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @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(IERC20 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");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// Dependency file: @openzeppelin/contracts/utils/EnumerableMap.sol


// pragma solidity ^0.6.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

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

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry 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.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

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

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

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

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

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

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

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

   /**
    * @dev Returns the element 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(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint256(value)));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }
}


// Dependency file: @openzeppelin/contracts/utils/ReentrancyGuard.sol


// pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


// Dependency file: @openzeppelin/contracts/math/Math.sol


// 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);
    }
}


// Dependency file: @openzeppelin/contracts/GSN/Context.sol


// 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;
    }
}


// Dependency file: @openzeppelin/contracts/access/Ownable.sol


// pragma solidity ^0.6.0;

// import "@openzeppelin/contracts/GSN/Context.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.
 */
contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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


// Dependency file: contracts/interfaces/IAlpaToken.sol


// pragma solidity 0.6.12;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";

interface IAlpaToken is IERC20 {
    function mint(address _to, uint256 _amount) external;
}


// Dependency file: contracts/interfaces/IAlpaSupplier.sol


// pragma solidity 0.6.12;

interface IAlpaSupplier {
    /**
     * @dev mint and distribute ALPA to caller
     * NOTE: caller must be approved consumer
     */
    function distribute(uint256 _since) external returns (uint256);

    /**
     * @dev returns number of ALPA _consumer is expected to recieved at current block
     */
    function preview(address _consumer, uint256 _since)
        external
        view
        returns (uint256);
}


// Dependency file: @openzeppelin/contracts/token/ERC1155/IERC1155.sol


// pragma solidity ^0.6.2;

// import "@openzeppelin/contracts/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values);

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external;
}


// Dependency file: contracts/interfaces/ICryptoAlpaca.sol


// pragma solidity =0.6.12;

// import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";

interface ICryptoAlpaca is IERC1155 {
    function getAlpaca(uint256 _id)
        external
        view
        returns (
            uint256 id,
            bool isReady,
            uint256 cooldownEndBlock,
            uint256 birthTime,
            uint256 matronId,
            uint256 sireId,
            uint256 hatchingCost,
            uint256 hatchingCostMultiplier,
            uint256 hatchCostMultiplierEndBlock,
            uint256 generation,
            uint256 gene,
            uint256 energy,
            uint256 state
        );

    function hasPermissionToBreedAsSire(address _addr, uint256 _id)
        external
        view
        returns (bool);

    function grandPermissionToBreed(address _addr, uint256 _sireId) external;

    function clearPermissionToBreed(uint256 _alpacaId) external;

    function hatch(uint256 _matronId, uint256 _sireId)
        external
        payable
        returns (uint256);

    function crack(uint256 _id) external;
}


// Dependency file: contracts/interfaces/ICryptoAlpacaEnergyListener.sol


// pragma solidity 0.6.12;

// import "@openzeppelin/contracts/introspection/IERC165.sol";

interface ICryptoAlpacaEnergyListener is IERC165 {
    /**
        @dev Handles the Alpaca energy change callback.
        @param id The id of the Alpaca which the energy changed
        @param oldEnergy The ID of the token being transferred
        @param newEnergy The amount of tokens being transferred
    */
    function onCryptoAlpacaEnergyChanged(
        uint256 id,
        uint256 oldEnergy,
        uint256 newEnergy
    ) external;
}


// Dependency file: contracts/interfaces/CryptoAlpacaEnergyListener.sol


// pragma solidity 0.6.12;

// import "@openzeppelin/contracts/introspection/ERC165.sol";
// import "contracts/interfaces/ICryptoAlpacaEnergyListener.sol";

abstract contract CryptoAlpacaEnergyListener is
    ERC165,
    ICryptoAlpacaEnergyListener
{
    constructor() public {
        _registerInterface(
            CryptoAlpacaEnergyListener(0).onCryptoAlpacaEnergyChanged.selector
        );
    }
}


// Root file: contracts/AlpacaFarm/AlpacaFarm.sol


pragma solidity 0.6.12;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol";
// import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
// import "@openzeppelin/contracts/utils/EnumerableMap.sol";
// import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
// import "@openzeppelin/contracts/math/SafeMath.sol";
// import "@openzeppelin/contracts/math/Math.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";

// import "contracts/interfaces/IAlpaToken.sol";
// import "contracts/interfaces/IAlpaSupplier.sol";
// import "contracts/interfaces/ICryptoAlpaca.sol";
// import "contracts/interfaces/CryptoAlpacaEnergyListener.sol";

// Alpaca Farm manages your LP and takes good care of you alpaca!
contract AlpacaFarm is
    Ownable,
    ReentrancyGuard,
    ERC1155Receiver,
    CryptoAlpacaEnergyListener
{
    using SafeMath for uint256;
    using Math for uint256;
    using SafeERC20 for IERC20;
    using EnumerableMap for EnumerableMap.UintToAddressMap;

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

    event Deposit(address indexed user, uint256 amount);

    event Withdraw(address indexed user, uint256 amount);

    event EmergencyWithdraw(address indexed user, uint256 amount);

    /* ========== STRUCT ========== */

    // Info of each user.
    struct UserInfo {
        // How many LP tokens the user has provided.
        uint256 amount;
        // Reward debt. What has been paid so far
        uint256 rewardDebt;
        // alpaca user transfered to AlpacaFarm to manage the LP assets
        uint256 alpacaID;
        // alpaca's energy
        uint256 alpacaEnergy;
    }

    // Info of each pool.
    struct PoolInfo {
        // Address of LP token contract.
        IERC20 lpToken;
        // Last block number that ALPAs distribution occurs.
        uint256 lastRewardBlock;
        // Accumulated ALPAs per share. Share is determined by LP deposit and total alpaca's energy
        uint256 accAlpaPerShare;
        // Accumulated Share
        uint256 accShare;
    }

    /* ========== STATES ========== */

    // The ALPA ERC20 token
    IAlpaToken public alpa;

    // Crypto alpaca contract
    ICryptoAlpaca public cryptoAlpaca;

    // Alpa Supplier
    IAlpaSupplier public supplier;

    // Energy if user does not have any alpaca transfered to AlpacaFarm to manage the LP assets
    uint256 public constant EMPTY_ALPACA_ENERGY = 1;

    // farm pool info
    PoolInfo public poolInfo;

    // Info of each user that stakes LP tokens.
    mapping(address => UserInfo) public userInfo;

    // map that keep tracks of the alpaca's original owner so contract knows where to send back when
    // users swapped or retrieved their alpacas
    EnumerableMap.UintToAddressMap private alpacaOriginalOwner;

    uint256 public constant SAFE_MULTIPLIER = 1e16;

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

    constructor(
        IAlpaToken _alpa,
        ICryptoAlpaca _cryptoAlpaca,
        IAlpaSupplier _supplier,
        IERC20 lpToken,
        uint256 _startBlock
    ) public {
        alpa = _alpa;
        cryptoAlpaca = _cryptoAlpaca;
        supplier = _supplier;
        poolInfo = PoolInfo({
            lpToken: lpToken,
            lastRewardBlock: block.number.max(_startBlock),
            accAlpaPerShare: 0,
            accShare: 0
        });
    }

    /* ========== PUBLIC ========== */

    /**
     * @dev View `_user` pending ALPAs
     */
    function pendingAlpa(address _user) external view returns (uint256) {
        UserInfo storage user = userInfo[_user];

        uint256 accAlpaPerShare = poolInfo.accAlpaPerShare;
        uint256 lpSupply = poolInfo.lpToken.balanceOf(address(this));

        if (block.number > poolInfo.lastRewardBlock && lpSupply != 0) {
            uint256 total = supplier.preview(
                address(this),
                poolInfo.lastRewardBlock
            );

            accAlpaPerShare = accAlpaPerShare.add(
                total.mul(SAFE_MULTIPLIER).div(poolInfo.accShare)
            );
        }
        return
            user
                .amount
                .mul(_safeUserAlpacaEnergy(user))
                .mul(accAlpaPerShare)
                .div(SAFE_MULTIPLIER)
                .sub(user.rewardDebt);
    }

    /**
     * @dev Update reward variables of the given pool to be up-to-date.
     */
    function updatePool() public {
        if (block.number <= poolInfo.lastRewardBlock) {
            return;
        }

        uint256 lpSupply = poolInfo.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            poolInfo.lastRewardBlock = block.number;
            return;
        }

        uint256 reward = supplier.distribute(poolInfo.lastRewardBlock);
        poolInfo.accAlpaPerShare = poolInfo.accAlpaPerShare.add(
            reward.mul(SAFE_MULTIPLIER).div(poolInfo.accShare)
        );

        poolInfo.lastRewardBlock = block.number;
    }

    /**
     * @dev Retrieve caller's Alpaca.
     */
    function retrieve() public nonReentrant {
        address sender = _msgSender();

        UserInfo storage user = userInfo[sender];
        require(user.alpacaID != 0, "AlpacaFarm: you do not have any alpaca");

        if (user.amount > 0) {
            updatePool();
            uint256 pending = user
                .amount
                .mul(user.alpacaEnergy)
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER)
                .sub(user.rewardDebt);
            if (pending > 0) {
                _safeAlpaTransfer(msg.sender, pending);
            }

            user.rewardDebt = user
                .amount
                .mul(EMPTY_ALPACA_ENERGY)
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER);

            poolInfo.accShare = poolInfo.accShare.sub(
                (user.alpacaEnergy.sub(1)).mul(user.amount)
            );
        }

        uint256 prevAlpacaID = user.alpacaID;
        user.alpacaID = 0;
        user.alpacaEnergy = 0;

        // Remove alpaca id to original user mapping
        alpacaOriginalOwner.remove(prevAlpacaID);

        cryptoAlpaca.safeTransferFrom(
            address(this),
            msg.sender,
            prevAlpacaID,
            1,
            ""
        );
    }

    /**
     * @dev Deposit LP tokens to AlpacaFarm for ALPA allocation.
     */
    function deposit(uint256 _amount) public nonReentrant {
        updatePool();

        UserInfo storage user = userInfo[msg.sender];
        if (user.amount > 0) {
            uint256 pending = user
                .amount
                .mul(_safeUserAlpacaEnergy(user))
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER)
                .sub(user.rewardDebt);
            if (pending > 0) {
                _safeAlpaTransfer(msg.sender, pending);
            }
        }

        if (_amount > 0) {
            poolInfo.lpToken.safeTransferFrom(
                address(msg.sender),
                address(this),
                _amount
            );
            user.amount = user.amount.add(_amount);
            poolInfo.accShare = poolInfo.accShare.add(
                _safeUserAlpacaEnergy(user).mul(_amount)
            );
        }

        user.rewardDebt = user
            .amount
            .mul(_safeUserAlpacaEnergy(user))
            .mul(poolInfo.accAlpaPerShare)
            .div(SAFE_MULTIPLIER);
        emit Deposit(msg.sender, _amount);
    }

    /**
     * @dev Withdraw LP tokens from AlpacaFarm.
     */
    function withdraw(uint256 _amount) public nonReentrant {
        UserInfo storage user = userInfo[msg.sender];
        require(user.amount >= _amount, "AlpacaFarm: invalid amount");

        updatePool();
        uint256 pending = user
            .amount
            .mul(_safeUserAlpacaEnergy(user))
            .mul(poolInfo.accAlpaPerShare)
            .div(SAFE_MULTIPLIER)
            .sub(user.rewardDebt);

        if (pending > 0) {
            _safeAlpaTransfer(msg.sender, pending);
        }
        if (_amount > 0) {
            user.amount = user.amount.sub(_amount);
            poolInfo.lpToken.safeTransfer(address(msg.sender), _amount);
            poolInfo.accShare = poolInfo.accShare.sub(
                _safeUserAlpacaEnergy(user).mul(_amount)
            );
        }

        user.rewardDebt = user
            .amount
            .mul(_safeUserAlpacaEnergy(user))
            .mul(poolInfo.accAlpaPerShare)
            .div(SAFE_MULTIPLIER);
        emit Withdraw(msg.sender, _amount);
    }

    // Withdraw without caring about rewards.
    // EMERGENCY ONLY.
    function emergencyWithdraw() public {
        UserInfo storage user = userInfo[msg.sender];
        require(user.amount > 0, "AlpacaFarm: insufficient balance");

        uint256 amount = user.amount;
        user.amount = 0;
        user.rewardDebt = 0;
        poolInfo.lpToken.safeTransfer(address(msg.sender), amount);
        emit EmergencyWithdraw(msg.sender, amount);
    }

    /* ========== PRIVATE ========== */

    function _safeUserAlpacaEnergy(UserInfo storage info)
        private
        view
        returns (uint256)
    {
        if (info.alpacaEnergy == 0) {
            return EMPTY_ALPACA_ENERGY;
        }
        return info.alpacaEnergy;
    }

    // Safe alpa transfer function, just in case if rounding error causes pool to not have enough ALPAs.
    function _safeAlpaTransfer(address _to, uint256 _amount) private {
        uint256 alpaBal = alpa.balanceOf(address(this));
        if (_amount > alpaBal) {
            alpa.transfer(_to, alpaBal);
        } else {
            alpa.transfer(_to, _amount);
        }
    }

    /* ========== ERC1155Receiver ========== */

    /**
     * @dev onERC1155Received implementation per IERC1155Receiver spec
     */
    function onERC1155Received(
        address,
        address _from,
        uint256 _id,
        uint256,
        bytes calldata
    ) external override nonReentrant returns (bytes4) {
        require(
            msg.sender == address(cryptoAlpaca),
            "AlpacaFarm: received alpaca from unauthenticated contract"
        );

        require(_id != 0, "AlpacaFarm: invalid alpaca");

        UserInfo storage user = userInfo[_from];

        // Fetch alpaca energy
        (, , , , , , , , , , , uint256 energy, ) = cryptoAlpaca.getAlpaca(_id);
        require(energy > 0, "AlpacaFarm: invalid alpaca energy");

        if (user.amount > 0) {
            updatePool();

            uint256 pending = user
                .amount
                .mul(_safeUserAlpacaEnergy(user))
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER)
                .sub(user.rewardDebt);
            if (pending > 0) {
                _safeAlpaTransfer(_from, pending);
            }
            // Update user reward debt with new energy
            user.rewardDebt = user
                .amount
                .mul(energy)
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER);

            poolInfo.accShare = poolInfo
                .accShare
                .add(energy.mul(user.amount))
                .sub(_safeUserAlpacaEnergy(user).mul(user.amount));
        }

        // update user global
        uint256 prevAlpacaID = user.alpacaID;
        user.alpacaID = _id;
        user.alpacaEnergy = energy;

        // keep track of alpaca owner
        alpacaOriginalOwner.set(_id, _from);

        // Give original owner the right to breed
        cryptoAlpaca.grandPermissionToBreed(_from, _id);

        if (prevAlpacaID != 0) {
            // Transfer alpaca back to owner
            cryptoAlpaca.safeTransferFrom(
                address(this),
                _from,
                prevAlpacaID,
                1,
                ""
            );
        }

        return
            bytes4(
                keccak256(
                    "onERC1155Received(address,address,uint256,uint256,bytes)"
                )
            );
    }

    /**
     * @dev onERC1155BatchReceived implementation per IERC1155Receiver spec
     * User should not send using batch.
     */
    function onERC1155BatchReceived(
        address,
        address,
        uint256[] memory,
        uint256[] memory,
        bytes memory
    ) external override returns (bytes4) {
        require(
            false,
            "AlpacaFarm: only supports transfer single alpaca at a time (e.g safeTransferFrom)"
        );
    }

    /* ========== ICryptoAlpacaEnergyListener ========== */

    /**
        @dev Handles the Alpaca energy change callback.
        @param _id The id of the Alpaca which the energy changed
        @param _newEnergy The new alpaca energy it changed to
    */
    function onCryptoAlpacaEnergyChanged(
        uint256 _id,
        uint256,
        uint256 _newEnergy
    ) external override {
        require(
            msg.sender == address(cryptoAlpaca),
            "AlpacaFarm: received alpaca from unauthenticated contract"
        );

        require(
            alpacaOriginalOwner.contains(_id),
            "AlpacaFarm: original owner not found"
        );

        address originalOwner = alpacaOriginalOwner.get(_id);
        UserInfo storage user = userInfo[originalOwner];

        if (user.amount > 0) {
            updatePool();

            uint256 pending = user
                .amount
                .mul(_safeUserAlpacaEnergy(user))
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER)
                .sub(user.rewardDebt);

            if (pending > 0) {
                _safeAlpaTransfer(originalOwner, pending);
            }

            // Update user reward debt with new energy
            user.rewardDebt = user
                .amount
                .mul(_newEnergy)
                .mul(poolInfo.accAlpaPerShare)
                .div(SAFE_MULTIPLIER);

            poolInfo.accShare = poolInfo
                .accShare
                .add(_newEnergy.mul(user.amount))
                .sub(_safeUserAlpacaEnergy(user).mul(user.amount));
        }

        // update alpaca energy
        user.alpacaEnergy = _newEnergy;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IAlpaToken","name":"_alpa","type":"address"},{"internalType":"contract ICryptoAlpaca","name":"_cryptoAlpaca","type":"address"},{"internalType":"contract IAlpaSupplier","name":"_supplier","type":"address"},{"internalType":"contract IERC20","name":"lpToken","type":"address"},{"internalType":"uint256","name":"_startBlock","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EmergencyWithdraw","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":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"EMPTY_ALPACA_ENERGY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SAFE_MULTIPLIER","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"alpa","outputs":[{"internalType":"contract IAlpaToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cryptoAlpaca","outputs":[{"internalType":"contract ICryptoAlpaca","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"_newEnergy","type":"uint256"}],"name":"onCryptoAlpacaEnergyChanged","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"_from","type":"address"},{"internalType":"uint256","name":"_id","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"pendingAlpa","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolInfo","outputs":[{"internalType":"contract IERC20","name":"lpToken","type":"address"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accAlpaPerShare","type":"uint256"},{"internalType":"uint256","name":"accShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"retrieve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"supplier","outputs":[{"internalType":"contract IAlpaSupplier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"updatePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"},{"internalType":"uint256","name":"alpacaID","type":"uint256"},{"internalType":"uint256","name":"alpacaEnergy","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000007ca4408137eb639570f8e647d9bd7b7e8717514a000000000000000000000000c7e5e9434f4a71e6db978bd65b4d61d3593e5f2700000000000000000000000014285e0c66379c0af1b1e8e9092f67a66ccf5cd7000000000000000000000000441f9e2c89a343cefb390a8954b3b562f8f91eca0000000000000000000000000000000000000000000000000000000000ab1efc

-----Decoded View---------------
Arg [0] : _alpa (address): 0x7cA4408137eb639570F8E647d9bD7B7E8717514A
Arg [1] : _cryptoAlpaca (address): 0xC7e5e9434f4a71e6dB978bD65B4D61D3593e5f27
Arg [2] : _supplier (address): 0x14285E0C66379c0AF1B1e8E9092F67a66cCF5cD7
Arg [3] : lpToken (address): 0x441F9E2C89A343cefb390a8954b3b562F8F91eca
Arg [4] : _startBlock (uint256): 11214588

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000007ca4408137eb639570f8e647d9bd7b7e8717514a
Arg [1] : 000000000000000000000000c7e5e9434f4a71e6db978bd65b4d61d3593e5f27
Arg [2] : 00000000000000000000000014285e0c66379c0af1b1e8e9092f67a66ccf5cd7
Arg [3] : 000000000000000000000000441f9e2c89a343cefb390a8954b3b562f8f91eca
Arg [4] : 0000000000000000000000000000000000000000000000000000000000ab1efc

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