Create loan_contract.sol

blockchain_integration/pi_network/smart_contracts/loan_contract.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract LoanContract {
+    struct Loan {
+        uint256 amount;
+        uint256 interestRate; // in basis points (1/100th of a percent)
+        uint256 duration; // in seconds
+        uint256 startTime;
+        address borrower;
+        bool isActive;
+    }
+
+    mapping(address => Loan) public loans;
+    event LoanRequested(address indexed borrower, uint256 amount, uint256 interestRate, uint256 duration);
+    event LoanRepaid(address indexed borrower, uint256 amount);
+
+    // Request a loan
+    function requestLoan(uint256 _amount, uint256 _interestRate, uint256 _duration) public {
+        require(loans[msg.sender].isActive == false, "Existing loan must be repaid first.");
+        loans[msg.sender] = Loan(_amount, _interestRate, _duration, block.timestamp, msg.sender, true);
+        emit LoanRequested(msg.sender, _amount, _interestRate, _duration);
+    }
+
+    // Repay the loan
+    function repayLoan() public payable {
+        Loan storage loan = loans[msg.sender];
+        require(loan.isActive, "No active loan found.");
+        uint256 totalRepayment = loan.amount + (loan.amount * loan.interestRate / 10000);
+        require(msg.value >= totalRepayment, "Insufficient repayment amount.");
+
+        loan.isActive = false;
+        emit LoanRepaid(msg.sender, totalRepayment);
+        payable(address(this)).transfer(msg.value);
+    }
+
+    // Get loan details
+    function getLoanDetails(address _borrower) public view returns (uint256, uint256, uint256, uint256, bool) {
+        Loan storage loan = loans[_borrower];
+        return (loan.amount, loan.interestRate, loan.duration, loan.startTime, loan.isActive);
+    }
+}