// SPDX-License-Identifier: MIT
//
pragma solidity 0.8.26;

interface ERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function getOwner() external view returns (address);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address _owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Context {
    
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}

contract Ownable is Context {
    address public _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}





contract ChampzClaim is Ownable {

  event Claimed(address indexed user, uint256 amount);

  ERC20 public oldToken;
  ERC20 public newToken;


  constructor(address _oldToken, address _newToken) {
    oldToken = ERC20(_oldToken);
    newToken = ERC20(_newToken);
  }

  function deposit(uint256 amount) public onlyOwner {
    newToken.transferFrom(msg.sender, address(this), amount);
  }

  function withdraw(address token, uint256 amount) public onlyOwner {
    ERC20(token).transfer(msg.sender, amount);
  }

  function claim() public {
    uint256 amount = oldToken.balanceOf(msg.sender);

    require(amount > 0, "No old token balance (user)");
    require(oldToken.allowance(msg.sender, address(this)) >= amount, "Insufficient allowance");
    require(newToken.balanceOf(address(this)) >= amount, "Insufficient new token balance (contract)");
    require(oldToken.transferFrom(msg.sender, address(this), amount), "Could not transfer old token");
    require(newToken.transfer(msg.sender, amount), "Could not transfer new token");
    
    emit Claimed(msg.sender, amount);
  }
}

{
  "compilationTarget": {
    "contracts/ChampzClaim.sol": "ChampzClaim"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}