// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

/**
 * @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);
}

interface IVoteProxy {
    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address _voter) external view returns (uint256);
}

contract BsdVoteProxy {
    IVoteProxy public voteProxy;
    address public governance;

    constructor() public {
        governance = msg.sender;
    }

    function name() external pure returns (string memory) {
        return "BasisDollar Vote Power";
    }

    function symbol() external pure returns (string memory) {
        return "BSD VP";
    }

    function decimals() external view returns (uint8) {
        return voteProxy.decimals();
    }

    function totalSupply() external view returns (uint256) {
        return voteProxy.totalSupply();
    }

    function balanceOf(address _voter) external view returns (uint256) {
        return voteProxy.balanceOf(_voter);
    }

    function setVoteProxy(IVoteProxy _voteProxy) external {
        require(msg.sender == governance, "!governance");
        voteProxy = _voteProxy;
    }

    function setGovernance(address _governance) external {
        require(msg.sender == governance, "!governance");
        governance = _governance;
    }

    function governanceRecoverUnsupported(
        IERC20 _token,
        uint256 amount,
        address to
    ) external {
        require(msg.sender == governance, "!governance");
        _token.transfer(to, amount);
    }
}