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



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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: src/Interfaces/IIQERC20.sol



// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.7.1;

import "./IMinter.sol";

// solhint-disable-next-line no-empty-blocks
interface IIQERC20 {
    function mint(address _addr, uint256 _amount) external;

    function burn(address _addr, uint256 _amount) external;

    function setMinter(IMinter _addr) external;

    function minter() external view returns (address);
}

// File: src/Interfaces/IMinter.sol



// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.7.1;

interface IMinter {
    event Minted(address _sender, uint256 _amount);
    event Burned(address _sender, uint256 _amount);

    function mint(uint256 _amount) external;

    function burn(uint256 _amount) external;

    function iQ() external view returns (address);

    function wrappedIQ() external view returns (address);
}

// File: src/Minters/TokenMinter.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.7.1;

import "../Interfaces/IMinter.sol";
import "../Interfaces/IIQERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract TokenMinter is IMinter {
    IIQERC20 private _iQ;
    IERC20 private _wrappedIQ;
    bool internal locked;

    modifier blockReentrancy {
        require(!locked, "Contract is locked");
        locked = true;
        _;
        locked = false;
    }

    constructor(IIQERC20 iQ, IERC20 wrappedIQ) {
        _iQ = iQ;
        _wrappedIQ = wrappedIQ;
    }

    function mint(uint256 _amount) external override blockReentrancy {
        require(_wrappedIQ.transferFrom(msg.sender, address(this), _amount), "Transfer has failed");
        _iQ.mint(msg.sender, _amount);
        emit Minted(msg.sender, _amount);
    }

    function burn(uint256 _amount) external override blockReentrancy {
        _iQ.burn(msg.sender, _amount);
        require(_wrappedIQ.transfer(msg.sender, _amount), "Transfer has failed");
        emit Burned(msg.sender, _amount);
    }

    function iQ() external view override returns (address) {
        return address(_iQ);
    }

    function wrappedIQ() external view override returns (address) {
        return address(_wrappedIQ);
    }
}