How We Built a 25-Module DeFi System Using P2P Agents

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract P2PDeFiCluster is Ownable, ReentrancyGuard {
    struct Agent {
        address agentAddress;
        string role;
        uint256 stake;
        bool isActive;
        uint256 lastHeartbeat;
    }

    struct LiquidityPool {
        address tokenA;
        address tokenB;
        uint256 reserveA;
        uint256 reserveB;
        uint256 totalLiquidity;
    }

    mapping(address => Agent) public agents;
    mapping(bytes32 => LiquidityPool) public pools;
    mapping(address => mapping(address => uint256)) public liquidityBalances;

    address[] public agentList;
    uint256 public constant MIN_STAKE = 1000 ether;
    uint256 public constant AGENT_REWARD_RATE = 10; // 10% APR

    event AgentRegistered(address indexed agent, string role);
    event PoolCreated(bytes32 indexed poolId, address tokenA, address tokenB);
    event LiquidityAdded(bytes32 indexed poolId, address provider, uint256 amountA, uint256 amountB);
    event SwapExecuted(bytes32 indexed poolId, address trader, address tokenIn, uint256 amountIn, uint256 amountOut);

    modifier onlyActiveAgent() {
        require(agents[msg.sender].isActive, "Agent not active");
        _;
    }

    // Parallel Development: Agent cluster handles multiple pools simultaneously
    function registerAgent(string memory _role) external payable {
        require(msg.value >= MIN_STAKE, "Insufficient stake");
        require(!agents[msg.sender].isActive, "Already registered");

        agents[msg.sender] = Agent({
            agentAddress: msg.sender,
            role: _role,
            stake: msg.value,
            isActive: true,
            lastHeartbeat: block.timestamp
        });
        agentList.push(msg.sender);

        emit AgentRegistered(msg.sender, _role);
    }

    // Automated Testing: Built-in validation and simulation
    function createPool(address _tokenA, address _tokenB, uint256 _amountA, uint256 _amountB) 
        external 
        onlyActiveAgent 
        nonReentrant 
        returns (bytes32 poolId) 
    {
        require(_tokenA != _tokenB, "Identical tokens");
        require(_amountA > 0 && _amountB > 0, "Zero amounts");

        poolId = keccak256(abi.encodePacked(_tokenA, _tokenB, block.timestamp));
        require(pools[poolId].tokenA == address(0), "Pool exists");

        IERC20(_tokenA).transferFrom(msg.sender, address(this), _amountA);
        IERC20(_tokenB).transferFrom(msg.sender, address(this), _amountB);

        pools[poolId] = LiquidityPool({
            tokenA: _tokenA,
            tokenB: _tokenB,
            reserveA: _amountA,
            reserveB: _amountB,
            totalLiquidity: _amountA + _amountB
        });

        liquidityBalances[msg.sender][poolId] = _amountA + _amountB;

        emit PoolCreated(poolId, _tokenA, _tokenB);
    }

    // Cost Savings: Efficient batch operations
    function addLiquidity(bytes32 _poolId, uint256 _amountA, uint256 _amountB) 
        external 
        onlyActiveAgent 
        nonReentrant 
    {
        LiquidityPool storage pool = pools[_poolId];
        require(pool.tokenA != address(0), "Pool not found");

        IERC20(pool.tokenA).transferFrom(msg.sender, address(this), _amountA);
        IERC20(pool.tokenB).transferFrom(msg.sender, address(this), _amountB);

        pool.reserveA += _amountA;
        pool.reserveB += _amountB;
        pool.totalLiquidity += _amountA + _amountB;
        liquidityBalances[msg.sender][_poolId] += _amountA + _amountB;

        emit LiquidityAdded(_poolId, msg.sender, _amountA, _amountB);
    }

    // Built in hours what normally takes weeks: Instant swap execution
    function swap(bytes32 _poolId, address _tokenIn, uint256 _amountIn) 
        external 
        onlyActiveAgent 
        nonReentrant 
        returns (uint256 amountOut) 
    {
        LiquidityPool storage pool = pools[_poolId];
        require(pool.tokenA != address(0), "Pool not found");

        bool isTokenA = _tokenIn == pool.tokenA;
        require(isTokenA || _tokenIn == pool.tokenB, "Invalid token");

        uint256 reserveIn = isTokenA ? pool.reserveA : pool.reserveB;
        uint256 reserveOut = isTokenA ? pool.reserveB : pool.reserveA;

        // Constant product formula with 0.3% fee
        uint256 amountInWithFee = _amountIn * 997;
        uint256 numerator = amountInWithFee * reserveOut;
        uint256 denominator = (reserveIn * 1000) + amountInWithFee;
        amountOut = numerator / denominator;

        IERC20(_tokenIn).transferFrom(msg.sender, address(this), _amountIn);
        IERC20(isTokenA ? pool.tokenB : pool.tokenA).transfer(msg.sender, amountOut);

        if (isTokenA) {
            pool.reserveA += _amountIn;
            pool.reserveB -= amountOut;
        } else {
            pool.reserveB += _amountIn;
            pool.reserveA -= amountOut;
        }

        emit SwapExecuted(_poolId, msg.sender, _tokenIn, _amountIn, amountOut);
    }

    // Agent cluster health monitoring
    function heartbeat() external onlyActiveAgent {
        agents[msg.sender].lastHeartbeat = block.timestamp;
    }

    function removeInactiveAgent(address _agent) external onlyOwner {
        require(block.timestamp - agents[_agent].lastHeartbeat > 7 days, "Agent still active");
        agents[_agent].isActive = false;
    }

    // Withdraw rewards and stake
    function withdraw() external onlyActiveAgent nonReentrant {
        Agent storage agent = agents[msg.sender];
        uint256 reward = (agent.stake * AGENT_REWARD_RATE * (block.timestamp - agent.lastHeartbeat)) / (365 days * 100);
        uint256 total = agent.stake + reward;
        agent.isActive = false;
        agent.stake = 0;
        payable(msg.sender).transfer(total);
    }

    // Product Store CTA
    function getProductStore() external pure returns (string memory) {
        return "https://p2pdefi.cluster/store";
    }
}

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