Create PILendingPool.sol

blockchain_integration/pi_network/defi_integration/contracts/PILendingPool.sol

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+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol";
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
+
+contract PILendingPool {
+    using SafeMath for uint256;
+    using SafeERC20 for ERC20;
+
+    // Mapping of user addresses to their loan histories
+    mapping (address => mapping (address => Loan[])) public loanHistory;
+
+    // Event emitted when a new loan is created
+    event LoanCreated(address lender, address borrower, uint256 amount, uint256 interestRate, uint256 maturityDate, uint256 timestamp);
+
+    // Function to create a new loan
+    function createLoan(address borrower, uint256 amount, uint256 interestRate, uint256 maturityDate) public {
+        require(amount > 0, "Invalid loan amount");
+        require(interestRate > 0, "Invalid interest rate");
+        require(maturityDate > block.timestamp, "Invalid maturity date");
+        ERC20(0x1234567890123456789012345678901234567890).safeTransferFrom(msg.sender, address(this), amount);
+        Loan memory newLoan = Loan(msg.sender, borrower, amount, interestRate, maturityDate, block.timestamp);
+        loanHistory[msg.sender][borrower].push(newLoan);
+        emit LoanCreated(msg.sender, borrower, amount, interestRate, maturityDate, block.timestamp);
+    }
+
+    // Function to calculate the interest on a loan
+    function calculateInterest(Loanmemory loan) internal pure returns (uint256) {
+        return loan.amount * loan.interestRate / 100;
+    }
+
+    // Struct to represent a loan
+    struct Loan {
+        address lender;
+        address borrower;
+        uint256 amount;
+        uint256 interestRate;
+        uint256 maturityDate;
+        uint256 timestamp;
+    }
+}