S Price: $0.574756 (-3.72%)
    /

    Contract Diff Checker

    Contract Name:
    Blacksail_Equal_Strategy

    Contract Source Code:

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
    
    pragma solidity ^0.8.20;
    
    import {Context} from "../utils/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.
     *
     * The initial owner is set to the address provided by the deployer. 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 Ownable is Context {
        address private _owner;
    
        /**
         * @dev The caller account is not authorized to perform an operation.
         */
        error OwnableUnauthorizedAccount(address account);
    
        /**
         * @dev The owner is not a valid owner account. (eg. `address(0)`)
         */
        error OwnableInvalidOwner(address owner);
    
        event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
        /**
         * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
         */
        constructor(address initialOwner) {
            if (initialOwner == address(0)) {
                revert OwnableInvalidOwner(address(0));
            }
            _transferOwnership(initialOwner);
        }
    
        /**
         * @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 {
            if (owner() != _msgSender()) {
                revert OwnableUnauthorizedAccount(_msgSender());
            }
        }
    
        /**
         * @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 {
            if (newOwner == address(0)) {
                revert OwnableInvalidOwner(address(0));
            }
            _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);
        }
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)
    
    pragma solidity ^0.8.20;
    
    import {IERC20} from "./IERC20.sol";
    import {IERC165} from "./IERC165.sol";
    
    /**
     * @title IERC1363
     * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
     *
     * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
     * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
     */
    interface IERC1363 is IERC20, IERC165 {
        /*
         * Note: the ERC-165 identifier for this interface is 0xb0202a11.
         * 0xb0202a11 ===
         *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
         *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
         *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
         *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
         *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
         *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
         */
    
        /**
         * @dev Moves a `value` amount of tokens from the caller's account to `to`
         * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
         * @param to The address which you want to transfer to.
         * @param value The amount of tokens to be transferred.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function transferAndCall(address to, uint256 value) external returns (bool);
    
        /**
         * @dev Moves a `value` amount of tokens from the caller's account to `to`
         * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
         * @param to The address which you want to transfer to.
         * @param value The amount of tokens to be transferred.
         * @param data Additional data with no specified format, sent in call to `to`.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);
    
        /**
         * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
         * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
         * @param from The address which you want to send tokens from.
         * @param to The address which you want to transfer to.
         * @param value The amount of tokens to be transferred.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function transferFromAndCall(address from, address to, uint256 value) external returns (bool);
    
        /**
         * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
         * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
         * @param from The address which you want to send tokens from.
         * @param to The address which you want to transfer to.
         * @param value The amount of tokens to be transferred.
         * @param data Additional data with no specified format, sent in call to `to`.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);
    
        /**
         * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
         * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
         * @param spender The address which will spend the funds.
         * @param value The amount of tokens to be spent.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function approveAndCall(address spender, uint256 value) external returns (bool);
    
        /**
         * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
         * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
         * @param spender The address which will spend the funds.
         * @param value The amount of tokens to be spent.
         * @param data Additional data with no specified format, sent in call to `spender`.
         * @return A boolean value indicating whether the operation succeeded unless throwing.
         */
        function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)
    
    pragma solidity ^0.8.20;
    
    import {IERC165} from "../utils/introspection/IERC165.sol";

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)
    
    pragma solidity ^0.8.20;
    
    import {IERC20} from "../token/ERC20/IERC20.sol";

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)
    
    pragma solidity ^0.8.20;
    
    /**
     * @dev Interface of the ERC-20 standard as defined in the ERC.
     */
    interface IERC20 {
        /**
         * @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 value of tokens in existence.
         */
        function totalSupply() external view returns (uint256);
    
        /**
         * @dev Returns the value of tokens owned by `account`.
         */
        function balanceOf(address account) external view returns (uint256);
    
        /**
         * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
    
        /**
         * @dev Moves a `value` amount of tokens from `from` to `to` using the
         * allowance mechanism. `value` 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 value) external returns (bool);
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/utils/SafeERC20.sol)
    
    pragma solidity ^0.8.20;
    
    import {IERC20} from "../IERC20.sol";
    import {IERC1363} from "../../../interfaces/IERC1363.sol";
    import {Address} from "../../../utils/Address.sol";
    
    /**
     * @title SafeERC20
     * @dev Wrappers around ERC-20 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 {
        /**
         * @dev An operation with an ERC-20 token failed.
         */
        error SafeERC20FailedOperation(address token);
    
        /**
         * @dev Indicates a failed `decreaseAllowance` request.
         */
        error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
    
        /**
         * @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(IERC20 token, address to, uint256 value) internal {
            _callOptionalReturn(token, abi.encodeCall(token.transfer, (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(IERC20 token, address from, address to, uint256 value) internal {
            _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, 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.
         *
         * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
         * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
         * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
         * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
         */
        function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
            uint256 oldAllowance = token.allowance(address(this), spender);
            forceApprove(token, spender, oldAllowance + value);
        }
    
        /**
         * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
         * value, non-reverting calls are assumed to be successful.
         *
         * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
         * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
         * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
         * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
         */
        function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
            unchecked {
                uint256 currentAllowance = token.allowance(address(this), spender);
                if (currentAllowance < requestedDecrease) {
                    revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
                }
                forceApprove(token, spender, currentAllowance - requestedDecrease);
            }
        }
    
        /**
         * @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.
         *
         * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
         * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
         * set here.
         */
        function forceApprove(IERC20 token, address spender, uint256 value) internal {
            bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));
    
            if (!_callOptionalReturnBool(token, approvalCall)) {
                _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
                _callOptionalReturn(token, approvalCall);
            }
        }
    
        /**
         * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
         * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
         * targeting contracts.
         *
         * Reverts if the returned value is other than `true`.
         */
        function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
            if (to.code.length == 0) {
                safeTransfer(token, to, value);
            } else if (!token.transferAndCall(to, value, data)) {
                revert SafeERC20FailedOperation(address(token));
            }
        }
    
        /**
         * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
         * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
         * targeting contracts.
         *
         * Reverts if the returned value is other than `true`.
         */
        function transferFromAndCallRelaxed(
            IERC1363 token,
            address from,
            address to,
            uint256 value,
            bytes memory data
        ) internal {
            if (to.code.length == 0) {
                safeTransferFrom(token, from, to, value);
            } else if (!token.transferFromAndCall(from, to, value, data)) {
                revert SafeERC20FailedOperation(address(token));
            }
        }
    
        /**
         * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
         * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
         * targeting contracts.
         *
         * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
         * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
         * once without retrying, and relies on the returned value to be true.
         *
         * Reverts if the returned value is other than `true`.
         */
        function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
            if (to.code.length == 0) {
                forceApprove(token, to, value);
            } else if (!token.approveAndCall(to, value, data)) {
                revert SafeERC20FailedOperation(address(token));
            }
        }
    
        /**
         * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
         */
        function _callOptionalReturn(IERC20 token, bytes memory data) private {
            uint256 returnSize;
            uint256 returnValue;
            assembly ("memory-safe") {
                let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
                // bubble errors
                if iszero(success) {
                    let ptr := mload(0x40)
                    returndatacopy(ptr, 0, returndatasize())
                    revert(ptr, returndatasize())
                }
                returnSize := returndatasize()
                returnValue := mload(0)
            }
    
            if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
                revert SafeERC20FailedOperation(address(token));
            }
        }
    
        /**
         * @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 silently catches all reverts and returns a bool instead.
         */
        function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
            bool success;
            uint256 returnSize;
            uint256 returnValue;
            assembly ("memory-safe") {
                success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
                returnSize := returndatasize()
                returnValue := mload(0)
            }
            return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
        }
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (utils/Address.sol)
    
    pragma solidity ^0.8.20;
    
    import {Errors} from "./Errors.sol";
    
    /**
     * @dev Collection of functions related to the address type
     */
    library Address {
        /**
         * @dev There's no code at `target` (it is not a contract).
         */
        error AddressEmptyCode(address target);
    
        /**
         * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
         */
        function sendValue(address payable recipient, uint256 amount) internal {
            if (address(this).balance < amount) {
                revert Errors.InsufficientBalance(address(this).balance, amount);
            }
    
            (bool success, ) = recipient.call{value: amount}("");
            if (!success) {
                revert Errors.FailedCall();
            }
        }
    
        /**
         * @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 or custom error, it is bubbled
         * up by this function (like regular Solidity function calls). However, if
         * the call reverted with no returned reason, this function reverts with a
         * {Errors.FailedCall} error.
         *
         * 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.
         */
        function functionCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionCallWithValue(target, data, 0);
        }
    
        /**
         * @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`.
         */
        function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
            if (address(this).balance < value) {
                revert Errors.InsufficientBalance(address(this).balance, value);
            }
            (bool success, bytes memory returndata) = target.call{value: value}(data);
            return verifyCallResultFromTarget(target, success, returndata);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a static call.
         */
        function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
            (bool success, bytes memory returndata) = target.staticcall(data);
            return verifyCallResultFromTarget(target, success, returndata);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a delegate call.
         */
        function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
            (bool success, bytes memory returndata) = target.delegatecall(data);
            return verifyCallResultFromTarget(target, success, returndata);
        }
    
        /**
         * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
         * was not a contract or bubbling up the revert reason (falling back to {Errors.FailedCall}) in case
         * of an unsuccessful call.
         */
        function verifyCallResultFromTarget(
            address target,
            bool success,
            bytes memory returndata
        ) internal view returns (bytes memory) {
            if (!success) {
                _revert(returndata);
            } else {
                // only check if target is a contract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                if (returndata.length == 0 && target.code.length == 0) {
                    revert AddressEmptyCode(target);
                }
                return returndata;
            }
        }
    
        /**
         * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
         * revert reason or with a default {Errors.FailedCall} error.
         */
        function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
            if (!success) {
                _revert(returndata);
            } else {
                return returndata;
            }
        }
    
        /**
         * @dev Reverts with returndata if present. Otherwise reverts with {Errors.FailedCall}.
         */
        function _revert(bytes memory returndata) 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
                assembly ("memory-safe") {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert Errors.FailedCall();
            }
        }
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
    
    pragma solidity ^0.8.20;
    
    /**
     * @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 Context {
        function _msgSender() internal view virtual returns (address) {
            return msg.sender;
        }
    
        function _msgData() internal view virtual returns (bytes calldata) {
            return msg.data;
        }
    
        function _contextSuffixLength() internal view virtual returns (uint256) {
            return 0;
        }
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (utils/Errors.sol)
    
    pragma solidity ^0.8.20;
    
    /**
     * @dev Collection of common custom errors used in multiple contracts
     *
     * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
     * It is recommended to avoid relying on the error API for critical functionality.
     *
     * _Available since v5.1._
     */
    library Errors {
        /**
         * @dev The ETH balance of the account is not enough to perform the operation.
         */
        error InsufficientBalance(uint256 balance, uint256 needed);
    
        /**
         * @dev A call to an address target failed. The target may have reverted.
         */
        error FailedCall();
    
        /**
         * @dev The deployment failed.
         */
        error FailedDeployment();
    
        /**
         * @dev A necessary precompile is missing.
         */
        error MissingPrecompile(address);
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)
    
    pragma solidity ^0.8.20;
    
    /**
     * @dev Interface of the ERC-165 standard, as defined in the
     * https://eips.ethereum.org/EIPS/eip-165[ERC].
     *
     * 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[ERC 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);
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)
    
    pragma solidity ^0.8.20;
    
    import {Context} from "../utils/Context.sol";
    
    /**
     * @dev Contract module which allows children to implement an emergency stop
     * mechanism that can be triggered by an authorized account.
     *
     * This module is used through inheritance. It will make available the
     * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
     * the functions of your contract. Note that they will not be pausable by
     * simply including this module, only once the modifiers are put in place.
     */
    abstract contract Pausable is Context {
        bool private _paused;
    
        /**
         * @dev Emitted when the pause is triggered by `account`.
         */
        event Paused(address account);
    
        /**
         * @dev Emitted when the pause is lifted by `account`.
         */
        event Unpaused(address account);
    
        /**
         * @dev The operation failed because the contract is paused.
         */
        error EnforcedPause();
    
        /**
         * @dev The operation failed because the contract is not paused.
         */
        error ExpectedPause();
    
        /**
         * @dev Initializes the contract in unpaused state.
         */
        constructor() {
            _paused = false;
        }
    
        /**
         * @dev Modifier to make a function callable only when the contract is not paused.
         *
         * Requirements:
         *
         * - The contract must not be paused.
         */
        modifier whenNotPaused() {
            _requireNotPaused();
            _;
        }
    
        /**
         * @dev Modifier to make a function callable only when the contract is paused.
         *
         * Requirements:
         *
         * - The contract must be paused.
         */
        modifier whenPaused() {
            _requirePaused();
            _;
        }
    
        /**
         * @dev Returns true if the contract is paused, and false otherwise.
         */
        function paused() public view virtual returns (bool) {
            return _paused;
        }
    
        /**
         * @dev Throws if the contract is paused.
         */
        function _requireNotPaused() internal view virtual {
            if (paused()) {
                revert EnforcedPause();
            }
        }
    
        /**
         * @dev Throws if the contract is not paused.
         */
        function _requirePaused() internal view virtual {
            if (!paused()) {
                revert ExpectedPause();
            }
        }
    
        /**
         * @dev Triggers stopped state.
         *
         * Requirements:
         *
         * - The contract must not be paused.
         */
        function _pause() internal virtual whenNotPaused {
            _paused = true;
            emit Paused(_msgSender());
        }
    
        /**
         * @dev Returns to normal state.
         *
         * Requirements:
         *
         * - The contract must be paused.
         */
        function _unpause() internal virtual whenPaused {
            _paused = false;
            emit Unpaused(_msgSender());
        }
    }

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)
    
    pragma solidity ^0.8.20;
    
    /**
     * @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 EIP-1153 (transient storage) is available on the chain you're deploying at,
     * consider using {ReentrancyGuardTransient} instead.
     *
     * 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].
     */
    abstract 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;
    
        /**
         * @dev Unauthorized reentrant call.
         */
        error ReentrancyGuardReentrantCall();
    
        constructor() {
            _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 making it call a
         * `private` function that does the actual work.
         */
        modifier nonReentrant() {
            _nonReentrantBefore();
            _;
            _nonReentrantAfter();
        }
    
        function _nonReentrantBefore() private {
            // On the first call to nonReentrant, _status will be NOT_ENTERED
            if (_status == ENTERED) {
                revert ReentrancyGuardReentrantCall();
            }
    
            // Any calls to nonReentrant after this point will fail
            _status = ENTERED;
        }
    
        function _nonReentrantAfter() private {
            // By storing the original value once again, a refund is triggered (see
            // https://eips.ethereum.org/EIPS/eip-2200)
            _status = NOT_ENTERED;
        }
    
        /**
         * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
         * `nonReentrant` function in the call stack.
         */
        function _reentrancyGuardEntered() internal view returns (bool) {
            return _status == ENTERED;
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity 0.8.20;
    
    import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
    import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
    import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
    import '@openzeppelin/contracts/access/Ownable.sol';
    import '@openzeppelin/contracts/utils/Pausable.sol';
    import './Equalizer_Interface.sol';
    
    contract Blacksail_Equal_Strategy is Ownable, Pausable, ReentrancyGuard {
        using SafeERC20 for IERC20;
    
        uint256 public immutable MAX = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
    
        // Tokens
        IERC20 public immutable native_token = IERC20(0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38);
        address public reward_token;
        address public staking_token;
        address public deposit_token;
        address public lp0;
        address public lp1;
    
        // Fee structure
        uint256 public WITHDRAWAL_MAX = 100000;
        uint256 public WITHDRAW_FEE = 100;     
        uint256 public DIVISOR = 1000;
        uint256 public CALL_FEE = 100;          
        uint256 public FEE_BATCH = 900;       
        uint256 public PLATFORM_FEE = 45;      
    
        // Third Party Addresses
        address public rewardPool;
        address public unirouter;
    
        // Information
        uint256 public lastHarvest;
        bool public harvestOnDeposit;
    
        // Platform Addresses
        address public vault;
        address public treasury;
    
        // Routes
        IEqualizer.Route[] public rewardToNative;
        IEqualizer.Route[] public nativeToLp0;
        IEqualizer.Route[] public nativeToLp1;
        address[] public rewards;
        uint256 public slippageTolerance;
    
        event Deposit(uint256 amount);
        event Withdraw(uint256 amount);
        event Harvest(address indexed harvester);
        event ChargeFees(uint256 callFee, uint256 protocolFee);
        event SetVault(address indexed newVault);
        event SetWithdrawalFee(uint256 newFee);
        event SetSlippageTolerance(uint256 newTolerance);
    
        /**
        * @dev Constructor to initialize the strategy contract.
        * @param _staking_token The token to be staked in the third-party farm.
        * @param _rewardPool The address of the reward pool where staking and rewards occur.
        * @param _unirouter The address of the Uniswap V2/V3 router for token swaps.
        * @param _harvestOnDeposit Boolean to enable or disable reward harvesting during deposits.
        * @param _rewardToNative The path for swapping rewards to the native token, using IEqualizer routes.
        *
        * This constructor:
        * - Sets up the core token and contract addresses for staking, rewards, and routing.
        * - Enables or disables harvest-on-deposit, with a default withdrawal fee of 0 if enabled.
        * - Defines the reward-to-native token conversion path for liquidity and fee operations.
        * - Grants initial token allowances to external contracts. */
    
        constructor (
            address _staking_token,
            address _rewardPool,
            address _rewardToken,
            address _unirouter,
            bool _harvestOnDeposit,
            address _treasury,
            IEqualizer.Route[] memory _rewardToNative,
            IEqualizer.Route[] memory _nativeToLp0,
            IEqualizer.Route[] memory _nativeToLp1
        ) Ownable(msg.sender) {
    
            staking_token = _staking_token;
            rewardPool = _rewardPool;
            reward_token = _rewardToken;
    
            rewardToNative = _rewardToNative;
            nativeToLp0 = _nativeToLp0;
            nativeToLp1 = _nativeToLp1;
    
            lp0 = nativeToLp0[0].to;
            lp1 = nativeToLp1[0].to;
    
            unirouter = _unirouter;
            treasury = _treasury;
    
            harvestOnDeposit = _harvestOnDeposit;
    
            rewards.push(reward_token);
    
            if (harvestOnDeposit) {
                setWithdrawalFee(0);
            }
        }
    
        /** @dev Sets the vault connected to this strategy */
        function setVault(address _vault) external onlyOwner {
            require(isContract(_vault), "Vault must be a contract");
            require(vault == address(0), "Vault already set");
            
            vault = _vault;
            _giveAllowances();
            emit SetVault(_vault);
        }
    
        /** @dev Function to synchronize balances before new user deposit. Can be overridden in the strategy. */
        function beforeDeposit() external virtual {
            if (harvestOnDeposit) {
                require(msg.sender == vault, "Vault deposit only");
                _harvest(address(this));
            }
        }
    
        
        /** @dev Deposits funds into third party farm */
        function deposit() public onlyAuthorized whenNotPaused {
            _deposit();
        }
    
        function _deposit() internal {
            uint256 staking_balance = IERC20(staking_token).balanceOf(address(this));
    
            if (staking_balance > 0) {
               IEqualizerPool(rewardPool).deposit(staking_balance);
            } 
        }
    
        /**
        * @dev Withdraws a specified amount of staking tokens to the vault. 
        * Handles balance retrieval from the reward pool if needed and deducts withdrawal fees if applicable.
        * 
        * @param _amount The amount of staking tokens to withdraw.
        *
        * Requirements:
        * - Can only be called by the vault.
        * - If not the owner and contract is not paused, a withdrawal fee is deducted unless `harvestOnDeposit` is enabled.
        *
        * Emits a {Withdraw} event with the updated strategy balance. */
    
        function withdraw(uint256 _amount) external nonReentrant {
            require(msg.sender == vault, "!vault");
    
            uint256 stakingBal = IERC20(staking_token).balanceOf(address(this));
    
            if (stakingBal < _amount) {
                IEqualizerPool(rewardPool).withdraw(_amount - stakingBal);
                stakingBal = IERC20(staking_token).balanceOf(address(this));
            }           
     
            if (stakingBal > _amount) {
                stakingBal = _amount;
            }
    
            uint256 wFee = (stakingBal * WITHDRAW_FEE) / WITHDRAWAL_MAX;
    
            if (!paused() && !harvestOnDeposit) {
                stakingBal = stakingBal - wFee;
            }
    
            IERC20(staking_token).safeTransfer(vault, stakingBal);
    
            emit Withdraw(balanceOf());
        }
    
        /**
        * @dev Triggers the harvest process to compound earnings.
        * Internally calls `_harvest` to collect rewards, charge fees, add liquidity, and reinvest. */
    
        function harvest() external {
            require(!isContract(msg.sender) || msg.sender == vault, "!auth Contract Harvest");
            _harvest(msg.sender);
        }
    
        /** @dev Compounds the strategy's earnings and charges fees */
        function _harvest(address caller) internal whenNotPaused {
            
            IEqualizerPool(rewardPool).getReward(address(this), rewards);
            uint256 rewardAmt = IERC20(reward_token).balanceOf(address(this));
    
            if (rewardAmt > 0){
                chargeFees(caller);
                addLiquidity();
                _deposit();
            }
    
            lastHarvest = block.timestamp;
            emit Harvest(msg.sender);
        }
    
        /** @dev This function converts all funds to WFTM, charges fees, and sends fees to respective accounts */
        function chargeFees(address caller) internal {                  
            uint256 toNative = IERC20(reward_token).balanceOf(address(this));
    
            IEqualizer(unirouter).swapExactTokensForTokensSupportingFeeOnTransferTokens(toNative, 0, rewardToNative, address(this), block.timestamp);
            
            uint256 nativeBal = IERC20(native_token).balanceOf(address(this));
    
            uint256 platformFee = (nativeBal * PLATFORM_FEE) / DIVISOR;
            uint256 callFeeAmount = (platformFee * CALL_FEE) / DIVISOR;
            uint256 treasuryFee = platformFee - callFeeAmount;
    
            if (caller != address(this)) {
                IERC20(native_token).safeTransfer(caller, callFeeAmount);
            }
            
            IERC20(native_token).safeTransfer(treasury, treasuryFee);
    
            emit ChargeFees(callFeeAmount, platformFee);
        }
    
        /**
        * @dev Adds liquidity by converting native tokens to the deposit token and forwarding them to the ICHI Vault.
        * 
        * - Checks for sufficient native token balance.
        * - Converts native tokens to the deposit token using the Uniswap V3 router if required.
        * - Approves the necessary allowances for the Uniswap V3 router.
        * - Forwards the converted deposit tokens to the ICHI Vault for staking.
        *
        * Requirements:
        * - The contract must have a positive balance of the native token. */
    
        function addLiquidity() internal {
            uint256 half = IERC20(native_token).balanceOf(address(this)) / 2;
    
            if (half > 0) {
                if (address(native_token) != lp0) {
                    IEqualizer(unirouter).swapExactTokensForTokensSupportingFeeOnTransferTokens(
                        half, 
                        0, 
                        nativeToLp0, 
                        address(this), 
                        block.timestamp
                    );
                }
    
                if (address(native_token) != lp1) {
                    IEqualizer(unirouter).swapExactTokensForTokensSupportingFeeOnTransferTokens(
                        half, 
                        0, 
                        nativeToLp1, 
                        address(this), 
                        block.timestamp
                    );
                }
    
                uint256 balLp0 = IERC20(lp0).balanceOf(address(this));
                uint256 balLp1 = IERC20(lp1).balanceOf(address(this));
    
                IEqualizer(unirouter).addLiquidity(
                    lp0, 
                    lp1, 
                    false, 
                    balLp0, 
                    balLp1, 
                    1, 
                    1, 
                    address(this), 
                    block.timestamp
                );
            }
        }
    
        /** @dev Determines the amount of reward in WFTM upon calling the harvest function */
        function harvestCallReward() public view returns (uint256) {
            uint256 rewardBal = rewardsAvailable();
            uint256 nativeOut;
            if (rewardBal > 0) {
                (nativeOut, ) = IEqualizer(unirouter).getAmountOut(rewardBal, reward_token, address(native_token));
            }
    
            return (((nativeOut * PLATFORM_FEE) / DIVISOR) * CALL_FEE) / DIVISOR;
        }
    
        /** @dev Sets harvest on deposit to @param _harvestOnDeposit */
        function setHarvestOnDeposit(bool _harvestOnDeposit) external onlyOwner {
            harvestOnDeposit = _harvestOnDeposit;
    
            if (harvestOnDeposit) {
                setWithdrawalFee(0);
            } else {
                setWithdrawalFee(10);
            }
        }
    
        /** @dev Returns the amount of rewards that are pending */
        function rewardsAvailable() public view returns (uint256) {
            return IEqualizerPool(rewardPool).earned(reward_token, address(this));
        }
    
        /** @dev calculate the total underlaying staking tokens held by the strat */
        function balanceOf() public view returns (uint256) {
            return balanceOfStakingToken() + balanceOfPool();
        }
    
        /** @dev it calculates how many staking tokens this contract holds */
        function balanceOfStakingToken() public view returns (uint256) {
            return IERC20(staking_token).balanceOf(address(this));
        }
    
        /** @dev it calculates how many staking tokens the strategy has working in the farm */
        function balanceOfPool() public view returns (uint256) {
            return IEqualizerPool(rewardPool).balanceOf(address(this));
        }
    
        /** @dev called as part of strat migration. Sends all the available funds back to the vault */
        function retireStrat() external {
            require(msg.sender == vault, "!vault");
            IEqualizerPool(rewardPool).withdraw(balanceOfPool());
            uint256 stakingBal = IERC20(staking_token).balanceOf(address(this));
            IERC20(staking_token).transfer(vault, stakingBal);
        }
    
        /** @dev Pauses the strategy contract */
        function pause() public onlyOwner {
            _pause();
            _removeAllowances();
        }
    
        /** @dev Unpauses the strategy contract */
        function unpause() external onlyOwner {
            _unpause();
            _giveAllowances();
            deposit();
        }
    
        /** @dev Gives allowances to spenders */
        function _giveAllowances() internal {
            IERC20(staking_token).approve(rewardPool, MAX);
            IERC20(reward_token).approve(unirouter, MAX);
            native_token.approve(unirouter, MAX);
            IERC20(lp0).approve(unirouter, MAX);
            IERC20(lp1).approve(unirouter, MAX);
        }
    
        /** @dev Removes allowances to spenders */
        function _removeAllowances() internal {
            IERC20(staking_token).approve(rewardPool, 0);
            IERC20(reward_token).approve(unirouter, 0);
            native_token.approve(unirouter, 0);
            IERC20(lp0).approve(unirouter, 0);
            IERC20(lp1).approve(unirouter, 0);
        }
    
        /**
        * @dev Sets the withdrawal fee for the strategy.
        *
        * - Ensures that the fee does not exceed 100 (representing 1%).
        * - Updates the `WITHDRAW_FEE` variable with the new fee value.
        *
        * Requirements:
        * - `fee` must be less than or equal to 100.
        *
        * @param fee The new withdrawal fee (scaled by 100,000 for precision). */
    
        function setWithdrawalFee(uint256 fee) internal {
            require(fee <= 100, "Fee too high");
    
            WITHDRAW_FEE = fee;
            emit SetWithdrawalFee(fee);
        }
    
        /**
        * @dev Allows the contract owner to set the slippage tolerance for token swaps.
        * This value is used to calculate the minimum acceptable output amount in swaps,
        * helping to mitigate the risks of slippage and unfavorable price changes.
        * 
        * Requirements:
        * - The caller must be the contract owner.
        * - The provided tolerance must be less than or equal to 1500 (representing a maximum of 15% slippage).
        * 
        * Emits:
        * - A {SetSlippageTolerance} event indicating the updated slippage tolerance.
        * 
        * @param _tolerance The new slippage tolerance value, scaled by 10,000 (e.g., 1500 = 15%).
        */
        function setSlippageTolerance(uint256 _tolerance) external onlyOwner {
            require(_tolerance <= 1500, "Invalid tolerance"); // Max 15%
    
            slippageTolerance = _tolerance;
            emit SetSlippageTolerance(slippageTolerance);
        }
    
        function isContract(address account) internal view returns (bool) {
            return account.code.length > 0;
        }
    
        modifier onlyAuthorized() {
            require(msg.sender == vault || msg.sender == address(this), "Not authorized, only Vault or Strategy");
            _;
        }
    }

    // SPDX-License-Identifier: MIT
    
    pragma solidity 0.8.20;
    
    interface IEqualizer {
        // Routes
        struct Routes {
            address from;
            address to;
            bool stable;
        }
    
        struct Route {
            address from;
            address to;
            bool stable;
        }
    
        function addLiquidity(
            address tokenA,
            address tokenB,
            bool stable,
            uint amountADesired,
            uint amountBDesired,
            uint amountAMin,
            uint amountBMin,
            address to,
            uint deadline
        ) external returns (uint amountA, uint amountB, uint liquidity);
    
        function addLiquidityETH(
            address token,
            bool stable,
            uint amountTokenDesired,
            uint amountTokenMin,
            uint amountETHMin,
            address to,
            uint deadline
        ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    
        function removeLiquidity(
            address tokenA,
            address tokenB,
            bool stable,
            uint liquidity,
            uint amountAMin,
            uint amountBMin,
            address to,
            uint deadline
        ) external returns (uint amountA, uint amountB);
    
        function removeLiquidityETH(
            address token,
            bool stable,
            uint liquidity,
            uint amountTokenMin,
            uint amountETHMin,
            address to,
            uint deadline
        ) external returns (uint amountToken, uint amountETH);
    
        function swapExactTokensForTokensSimple(
            uint amountIn,
            uint amountOutMin,
            address tokenFrom,
            address tokenTo,
            bool stable,
            address to,
            uint deadline
        ) external returns (uint[] memory amounts);
    
        function swapExactTokensForTokens(
            uint amountIn,
            uint amountOutMin,
            Routes[] memory route,
            address to,
            uint deadline
        ) external returns (uint[] memory amounts);
    
         function swapExactTokensForTokensSupportingFeeOnTransferTokens(
            uint amountIn,
            uint amountOutMin,
            Route[] calldata routes,
            address to,
            uint deadline
        ) external;
    
        function getAmountOut(
            uint amountIn,
            address tokenIn,
            address tokenOut
        ) external view returns (uint amount, bool stable);
    
        function getAmountsOut(uint amountIn, Route[] memory routes) external view returns (uint[] memory amounts);
    
        function quoteAddLiquidity(
            address tokenA,
            address tokenB,
            bool stable,
            uint amountADesired,
            uint amountBDesired
        ) external view returns (uint amountA, uint amountB, uint liquidity);
    
        function quoteAddLiquidity(
            address tokenA,
            address tokenB,
            bool stable,
            address _factory,
            uint amountADesired,
            uint amountBDesired
        ) external view returns (uint amountA, uint amountB, uint liquidity);
    
        function defaultFactory() external view returns (address);
    }
    
    interface IEqualizerPool {
        function deposit(uint256 amount) external;
        function withdraw(uint256 amount) external;
        function getReward(address user, address[] memory rewards) external;
        function earned(address token, address user) external view returns (uint256);
        function balanceOf(address account) external view returns (uint256);
        function stake() external view returns (address);
    }

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