// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import './interfaces/IERC20.sol';

// Pair Fees contract is used as a 1:1 pair relationship to split out fees, this ensures that the curve does not need to be modified for LP shares
contract PairFees {

    address internal immutable pair; // The pair it is bonded to
    address internal immutable token0; // token0 of pair, saved localy and statically for gas optimization
    address internal immutable token1; // Token1 of pair, saved localy and statically for gas optimization

    uint256 public toStake0;
    uint256 public toStake1;

    constructor(address _token0, address _token1) {
        pair = msg.sender;
        token0 = _token0;
        token1 = _token1;
    }

    function _safeTransfer(address token,address to,uint256 value) internal {
        require(token.code.length > 0);
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))));
    }

    // Allow the pair to transfer fees to users
    function claimFeesFor(address recipient, uint amount0, uint amount1) external {
        require(msg.sender == pair);
        if (amount0 > 0) _safeTransfer(token0, recipient, amount0);
        if (amount1 > 0) _safeTransfer(token1, recipient, amount1);
    }

   

    function processStakingFees(uint amount, bool isTokenZero) external {
        require(msg.sender == pair);
        if(amount > 0 && isTokenZero){
            toStake0 += amount;
        }
    
        if(amount > 0 && !isTokenZero){
            toStake1 += amount;
        }

    }

    function withdrawStakingFees(address recipient) external {
        require(msg.sender == pair);
        if (toStake0 > 0){
            _safeTransfer(token0, recipient, toStake0);
            toStake0 = 0;
        } 
        if (toStake1 > 0){
            _safeTransfer(token1, recipient, toStake1);
            toStake1 = 0;
        }
    }

      

}

{
  "compilationTarget": {
    "contracts/PairFees.sol": "PairFees"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "remappings": []
}