// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// File: daopower.sol


pragma solidity ^0.8.0;


contract MemeTokenStaking {
    address public owner;

    constructor() {
        owner = msg.sender;
    }

    struct TokenInfo {
        IERC20 token;
        uint256 votingPower;
    }

    mapping(address => TokenInfo) tokenWhitelist;
    mapping(address => mapping(address => uint256)) public stakes; // Mapping from user address to token address to staked amount

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can call this function");
        _;
    }

    function configureToken(address _tokenAddr, uint256 _votingPower) external onlyOwner {
        require(_tokenAddr != address(0), "Invalid token address");
        tokenWhitelist[_tokenAddr] = TokenInfo({
            token: IERC20(_tokenAddr),
            votingPower: _votingPower
        });
    }

    function stake(address _tokenAddr, uint256 _amount) external {
        require(_tokenAddr != address(0), "Invalid token address");
        require(tokenWhitelist[_tokenAddr].votingPower != 0, "Token not accepted for staking");
        require(_amount > 0, "Cannot stake zero tokens");

        // Transfer tokens from user to staking contract
        tokenWhitelist[_tokenAddr].token.transferFrom(msg.sender, address(this), _amount);
        stakes[msg.sender][_tokenAddr] += _amount; // Update user's stake amount
    }

    function unstake(address _tokenAddr, uint256 _amount) external {
        require(_amount > 0, "Cannot unstake zero tokens");
        require(stakes[msg.sender][_tokenAddr] >= _amount, "Insufficient staked tokens");

        // Transfer tokens back from the staking contract to the user
        tokenWhitelist[_tokenAddr].token.transfer(msg.sender, _amount);
        stakes[msg.sender][_tokenAddr] -= _amount; // Update user's stake amount
    }
}