// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import { LoopbackProxy } from "../v1/LoopbackProxy.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import { GovernancePatchUpgrade } from "./GovernancePatchUpgrade.sol";
import { TornadoStakingRewards } from "./TornadoStakingRewards.sol";
import { RelayerRegistry } from "./RelayerRegistry.sol";

interface Proxy {
  function upgradeTo(address newImplementation) external;
}

/**
 * @notice Proposal which should patch governance against the metamorphic contract replacement vulnerability.
 */
contract PatchProposal {
  // Address of the staking proxy
  address public constant stakingProxyAddress = 0x2FC93484614a34f26F7970CBB94615bA109BB4bf;

  // Address of the registry proxy
  address public constant registryProxyAddress = 0x58E8dCC13BE9780fC42E8723D8EaD4CF46943dF2;

  // Address of the gas compensation vault
  address public constant gasCompensationVaultAddress = 0xFA4C1f3f7D5dd7c12a9Adb82Cd7dDA542E3d59ef;

  // Address of the user vault (not replaced)
  address public constant userVaultAddress = 0x2F50508a8a3D323B91336FA3eA6ae50E55f32185;

  // Address of the governance proxy
  address payable public constant governanceProxyAddress = 0x5efda50f22d34F262c29268506C5Fa42cB56A1Ce;

  // Torn token
  IERC20 public constant TORN = IERC20(0x77777FeDdddFfC19Ff86DB637967013e6C6A116C);

  // These are the contracts we deployed
  address public immutable deployedStakingContractAddress;
  address public immutable deployedRelayerRegistryImplementationAddress;

  constructor(address _deployedStakingContractAddress, address _deployedRelayerRegistryImplementationAddress)
    public
  {
    deployedStakingContractAddress = _deployedStakingContractAddress;
    deployedRelayerRegistryImplementationAddress = _deployedRelayerRegistryImplementationAddress;
  }

  /// @notice Function to execute the proposal.
  function executeProposal() external {
    // Get the old staking contract
    TornadoStakingRewards oldStaking = TornadoStakingRewards(stakingProxyAddress);

    // Get the small amount of TORN left
    oldStaking.withdrawTorn(TORN.balanceOf(address(oldStaking)));

    // And create a new staking contract
    TornadoStakingRewards newStaking = TornadoStakingRewards(deployedStakingContractAddress);

    // Upgrade the registry proxy
    Proxy(registryProxyAddress).upgradeTo(deployedRelayerRegistryImplementationAddress);

    // Now upgrade the governance to the latest stuff
    LoopbackProxy(governanceProxyAddress).upgradeTo(
      address(new GovernancePatchUpgrade(address(newStaking), gasCompensationVaultAddress, userVaultAddress))
    );
  }
}