// File: /contracts/Platform/MetaUnit/Whitelist/MetaUnitIDOWhitelist.sol



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

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {Pausable} from "../../../Pausable.sol";

contract MetaUnitIDOWhitelist is Pausable, ReentrancyGuard {
    mapping (address => bool) private is_whitelist_address;
    uint256 constant _start_time = 1667980800;
    uint256 private _price;
    address private _metaunit_address;
    address private _project_address;

    constructor (uint256 price_, address metaunit_address_, address project_address_) Pausable(project_address_) {
        _price = price_;
        _metaunit_address = metaunit_address_;
        _project_address = project_address_;
    }

    function buy(uint256 amount_) public payable notPaused nonReentrant {
        require(block.timestamp >= _start_time, "Event not started yet");
        require(msg.value >= amount_ * _price, "Not enough funds sent");
        require(is_whitelist_address[msg.sender], "You are not in whitelist");
        IERC20(_metaunit_address).transfer(msg.sender, amount_);
        payable(_project_address).transfer(msg.value);
    }

    function setWhiteList(address[] memory addresses_, bool action_) public {
        require(msg.sender == _project_address, "Permission denied");
        for (uint256 i = 0; i < addresses_.length; i ++) {
            is_whitelist_address[addresses_[i]] = action_;
        }
    }

    function setPrice(uint256 price_) public {
        require(msg.sender == _project_address, "Permission denied");
        _price = price_;
    }

    function withdraw() public {
        require(msg.sender == _project_address, "Permission denied");
        IERC20 metainit = IERC20(_metaunit_address);
        metainit.transfer(_project_address, metainit.balanceOf(address(this)));
    }
}

// File: /contracts/Pausable.sol



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

/**
 * @author MetaPlayerOne DAO
 * @title Pausable
 * @notice Contract which manages allocations in MetaPlayerOne.
 */
contract Pausable {
    address internal _owner_of;
    bool internal _paused = false;

    /**
    * @dev setup owner of this contract with paused off state.
    */
    constructor(address owner_of_) {
        _owner_of = owner_of_;
        _paused = false;
    }

    /**
    * @dev modifier which can be used on child contract for checking if contract services are paused.
    */
    modifier notPaused() {
        require(!_paused, "Contract is paused");
        _;
    }

    /**
    * @dev function which setup paused variable.
    * @param paused_ new boolean value of paused condition.
    */
    function setPaused(bool paused_) external {
        require(_paused == paused_, "Param has been asigned already");
        require(_owner_of == msg.sender, "Permission address");
        _paused = paused_;
    }

    /**
    * @dev function which setup owner variable.
    * @param owner_of_ new owner of contract.
    */
    function setOwner(address owner_of_) external {
        require(_owner_of == msg.sender, "Permission address");
        _owner_of = owner_of_;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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);
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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].
 */
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;

    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() {
        // 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;
    }
}