// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

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

import { LoopbackProxy } from "../v1/LoopbackProxy.sol";
import { AdminUpgradeableProxy } from "./proxy/AdminUpgradeableProxy.sol";

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

/**
 * @notice Proposal which should patch governance against the metamorphic contract replacement vulnerability and also fix several issues which have appeared as a result of the attack.
 */
contract PatchProposal {
  // Address of the old staking proxy
  address public constant oldStakingProxyAddress = 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
  address public constant userVaultAddress = 0x2F50508a8a3D323B91336FA3eA6ae50E55f32185;

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

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

  // The staking proxy (pointing to a new implementation (with same code)) that we've deployed
  address public immutable deployedStakingProxyContractAddress;

  // The registry implementation (with same code) that we've deployed
  address public immutable deployedRelayerRegistryImplementationAddress;

  constructor(
    address _deployedStakingProxyContractAddress,
    address _deployedRelayerRegistryImplementationAddress
  ) public {
    deployedStakingProxyContractAddress = _deployedStakingProxyContractAddress;
    deployedRelayerRegistryImplementationAddress = _deployedRelayerRegistryImplementationAddress;
  }

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

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

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

    // Now upgrade the governance implementation to the vulnerability resistant one
    LoopbackProxy(governanceProxyAddress).upgradeTo(
      address(
        new GovernancePatchUpgrade(
          deployedStakingProxyContractAddress,
          gasCompensationVaultAddress,
          userVaultAddress
        )
      )
    );

    // Transfer TORN in compensation to the staking proxy
    TORN.transfer(deployedStakingProxyContractAddress, 94_092 ether);
  }
}