// File: contracts/executionStrategies/StrategyStandardSaleForFixedPriceV1B.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {OrderTypes} from "../libraries/OrderTypes.sol";
import {IExecutionStrategy} from "../interfaces/IExecutionStrategy.sol";

/**
 * @title StrategyStandardSaleForFixedPriceV1B
 * @notice Strategy that executes an order at a fixed price that
 * can be taken either by a bid or an ask.
 */
contract StrategyStandardSaleForFixedPriceV1B is Ownable, IExecutionStrategy {
    // Event if the protocol fee changes
    event NewProtocolFee(uint256 protocolFee);

    // Protocol fee
    uint256 internal _protocolFee = 150;

    /**
     * @notice Check whether a taker ask order can be executed against a maker bid
     * @param takerAsk taker ask order
     * @param makerBid maker bid order
     * @return (whether strategy can be executed, tokenId to execute, amount of tokens to execute)
     */
    function canExecuteTakerAsk(OrderTypes.TakerOrder calldata takerAsk, OrderTypes.MakerOrder calldata makerBid)
        external
        view
        override
        returns (
            bool,
            uint256,
            uint256
        )
    {
        return (
            ((makerBid.price == takerAsk.price) &&
                (makerBid.tokenId == takerAsk.tokenId) &&
                (makerBid.startTime <= block.timestamp) &&
                (makerBid.endTime >= block.timestamp)),
            makerBid.tokenId,
            makerBid.amount
        );
    }

    /**
     * @notice Check whether a taker bid order can be executed against a maker ask
     * @param takerBid taker bid order
     * @param makerAsk maker ask order
     * @return (whether strategy can be executed, tokenId to execute, amount of tokens to execute)
     */
    function canExecuteTakerBid(OrderTypes.TakerOrder calldata takerBid, OrderTypes.MakerOrder calldata makerAsk)
        external
        view
        override
        returns (
            bool,
            uint256,
            uint256
        )
    {
        return (
            ((makerAsk.price == takerBid.price) &&
                (makerAsk.tokenId == takerBid.tokenId) &&
                (makerAsk.startTime <= block.timestamp) &&
                (makerAsk.endTime >= block.timestamp)),
            makerAsk.tokenId,
            makerAsk.amount
        );
    }

    /**
     * @notice Set new protocol fee for this strategy
     * @param newProtocolFee protocol fee
     */
    function setProtocolFee(uint256 newProtocolFee) external onlyOwner {
        require(newProtocolFee < _protocolFee, "Owner: Protocol fee too high");
        _protocolFee = newProtocolFee;

        emit NewProtocolFee(newProtocolFee);
    }

    /**
     * @notice Return protocol fee for this strategy
     * @return protocol fee
     */
    function viewProtocolFee() external view override returns (uint256) {
        return _protocolFee;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract 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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _transferOwnership(address(0));
    }

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

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

// File: contracts/libraries/OrderTypes.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title OrderTypes
 * @notice This library contains order types for the LooksRare exchange.
 */
library OrderTypes {
    // keccak256("MakerOrder(bool isOrderAsk,address signer,address collection,uint256 price,uint256 tokenId,uint256 amount,address strategy,address currency,uint256 nonce,uint256 startTime,uint256 endTime,uint256 minPercentageToAsk,bytes params)")
    bytes32 internal constant MAKER_ORDER_HASH = 0x40261ade532fa1d2c7293df30aaadb9b3c616fae525a0b56d3d411c841a85028;

    struct MakerOrder {
        bool isOrderAsk; // true --> ask / false --> bid
        address signer; // signer of the maker order
        address collection; // collection address
        uint256 price; // price (used as )
        uint256 tokenId; // id of the token
        uint256 amount; // amount of tokens to sell/purchase (must be 1 for ERC721, 1+ for ERC1155)
        address strategy; // strategy for trade execution (e.g., DutchAuction, StandardSaleForFixedPrice)
        address currency; // currency (e.g., WETH)
        uint256 nonce; // order nonce (must be unique unless new maker order is meant to override existing one e.g., lower ask price)
        uint256 startTime; // startTime in timestamp
        uint256 endTime; // endTime in timestamp
        uint256 minPercentageToAsk; // slippage protection (9000 --> 90% of the final price must return to ask)
        bytes params; // additional parameters
        uint8 v; // v: parameter (27 or 28)
        bytes32 r; // r: parameter
        bytes32 s; // s: parameter
    }

    struct TakerOrder {
        bool isOrderAsk; // true --> ask / false --> bid
        address taker; // msg.sender
        uint256 price; // final price for the purchase
        uint256 tokenId;
        uint256 minPercentageToAsk; // // slippage protection (9000 --> 90% of the final price must return to ask)
        bytes params; // other params (e.g., tokenId)
    }

    function hash(MakerOrder memory makerOrder) internal pure returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    MAKER_ORDER_HASH,
                    makerOrder.isOrderAsk,
                    makerOrder.signer,
                    makerOrder.collection,
                    makerOrder.price,
                    makerOrder.tokenId,
                    makerOrder.amount,
                    makerOrder.strategy,
                    makerOrder.currency,
                    makerOrder.nonce,
                    makerOrder.startTime,
                    makerOrder.endTime,
                    makerOrder.minPercentageToAsk,
                    keccak256(makerOrder.params)
                )
            );
    }
}

// File: contracts/interfaces/IExecutionStrategy.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {OrderTypes} from "../libraries/OrderTypes.sol";

interface IExecutionStrategy {
    function canExecuteTakerAsk(OrderTypes.TakerOrder calldata takerAsk, OrderTypes.MakerOrder calldata makerBid)
        external
        view
        returns (
            bool,
            uint256,
            uint256
        );

    function canExecuteTakerBid(OrderTypes.TakerOrder calldata takerBid, OrderTypes.MakerOrder calldata makerAsk)
        external
        view
        returns (
            bool,
            uint256,
            uint256
        );

    function viewProtocolFee() external view returns (uint256);
}

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

/**
 * @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 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;
    }
}