// SPDX-License-Identifier: Apache-2.0
// https://docs.soliditylang.org/en/v0.8.10/style-guide.html
pragma solidity ^0.8.10;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {ERC4626Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import {MathUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
import "src/interfaces/IMoolaLendingPool.sol";
import "src/interfaces/IStableToken.sol";
import "src/staking/StakedERC4626Upgradeable.sol";
import "src/interfaces/IRegistry.sol";

import "src/staking/SpiralsCUSDVault.sol";
import "src/vaults/ImpactVault.sol";
import "src/vaults/SpiralsCUSDImpactVault.sol";
import "src/staking/migration/IMigrationToImpactVault.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

contract SpiralsCUSDVaultMigration is
    IMigrationToImpactVault,
    SpiralsCUSDVault
{
    /// @param _yields values will come from subgraph
    function transferAssetsToImpactVault(
        address[] memory _addrs,
        ImpactVault _vault,
        uint256[] memory _yields
    ) external onlyOwner whenPaused {
        for (uint256 i = 0; i < _addrs.length; i++) {
            transferAssetsToImpactVaultForAddress(
                _addrs[i],
                _vault,
                _yields[i]
            );
        }
    }

    function transferAssetsToImpactVaultForAddress(
        address _address,
        ImpactVault _vault,
        uint256 _yield
    ) public onlyOwner whenPaused {
        uint256 cUSDStaked = balanceOf(_address);
        uint256 totalCUSD = cUSDStaked + _yield;
        if (totalCUSD == 0) {
            return;
        }

        // withdraw from Moola LP (mcUSD -> cUSD)
        c_moolaLendingPool.withdraw(asset(), totalCUSD, address(this));
        _burn(_address, cUSDStaked);

        // deposit into new vault
        IERC20Upgradeable(asset()).approve(address(_vault), totalCUSD);
        SpiralsCUSDImpactVault cUSDVault = SpiralsCUSDImpactVault(
            payable(address(_vault))
        );
        cUSDVault.depositWithYield(cUSDStaked, _address, _yield);
        emit AssetsTransferredToImpactVault(
            _address,
            cUSDStaked,
            _yield,
            address(_vault)
        );

        // This event will decrease cUSD staked count on Spirals subgraph
        // but as long as subgraph is handling "Deposit" event appropriately
        // on the new vault then we are good.
        emit Withdraw(msg.sender, _address, _address, cUSDStaked, cUSDStaked);
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }
}