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Viewing File: start_copy_trade.php

<?php
// Turn off error output to screen to prevent breaking the JSON response
ini_set('display_errors', 0);
error_reporting(E_ALL);

session_start();
require_once('includes/connect.php');
require_once('includes/functions.php');

// Tell the browser we are sending JSON data back
header('Content-Type: application/json');

// 1. Check Authentication
if (!isset($_SESSION['Email'])) {
    echo json_encode(['status' => 'error', 'message' => 'Your session has expired. Please log in again.']);
    exit();
}

// 2. CSRF Token Validation
if (!isset($_POST['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
    echo json_encode(['status' => 'error', 'message' => 'Security token invalid. Please refresh the page and try again.']);
    exit();
}

// 3. Fetch User Data
$user = GetMember1($_SESSION['Email']);
if (!$user) {
    echo json_encode(['status' => 'error', 'message' => 'User account not found.']);
    exit();
}

$userId = $user['ID'];
$userCapital = floatval($user['Capital']); 

// 4. Sanitize and Validate POST Data
$expertId = isset($_POST['expert_id']) ? intval($_POST['expert_id']) : 0;
$amount = isset($_POST['investment_amount']) ? floatval($_POST['investment_amount']) : 0;

if ($expertId <= 0 || $amount <= 0) {
    echo json_encode(['status' => 'error', 'message' => 'Invalid investment parameters.']);
    exit();
}

try {
    // 5. Verify the Master Trader exists and is active
    $stmtTrader = $conn->prepare("SELECT name, min_startup, status FROM copy_traders WHERE id = ?");
    $stmtTrader->bind_param("i", $expertId);
    $stmtTrader->execute();
    $resTrader = $stmtTrader->get_result();
    
    if ($resTrader->num_rows === 0) {
        echo json_encode(['status' => 'error', 'message' => 'Master Trader not found.']);
        exit();
    }
    
    $trader = $resTrader->fetch_assoc();
    $stmtTrader->close();

    if ($trader['status'] !== 'active') {
        echo json_encode(['status' => 'error', 'message' => 'This trader is currently inactive and cannot be copied.']);
        exit();
    }

    $minStartup = floatval($trader['min_startup']);

    // 6. Validate Minimum Investment Requirement
    if ($amount < $minStartup) {
        echo json_encode([
            'status' => 'error', 
            'message' => 'The minimum allocation to copy ' . htmlspecialchars($trader['name']) . ' is ' . htmlspecialchars($user['sym']) . number_format($minStartup, 2) . '.'
        ]);
        exit();
    }
    
    // 7. Check User's Available Capital
    if ($amount > $userCapital) {
        echo json_encode([
            'status' => 'error', 
            'message' => 'Insufficient capital! You only have ' . htmlspecialchars($user['sym']) . number_format($userCapital, 2) . ' available.'
        ]);
        exit();
    }

    // Start a database transaction so money is safely transferred
    $conn->begin_transaction();

    // 8. Deduct the amount from the user's Capital
    $newCapital = $userCapital - $amount;
    $updateCapStmt = $conn->prepare("UPDATE members SET Capital = ? WHERE ID = ?");
    $updateCapString = strval($newCapital); 
    $updateCapStmt->bind_param("si", $updateCapString, $userId);
    $updateCapStmt->execute();
    $updateCapStmt->close();

    // 9. Insert the Copy Trade into the `user_copy_trades` table
    $insertCopyStmt = $conn->prepare("INSERT INTO user_copy_trades (user_id, trader_id, amount_invested, status) VALUES (?, ?, ?, 'ACTIVE')");
    $insertCopyStmt->bind_param("iid", $userId, $expertId, $amount);
    $insertCopyStmt->execute();
    $insertCopyStmt->close();

    // 10. FIXED BUG: Update the Trader's followers Count (+1)
    $updateTraderStmt = $conn->prepare("UPDATE copy_traders SET followers = followers + 1 WHERE id = ?");
    $updateTraderStmt->bind_param("i", $expertId);
    $updateTraderStmt->execute();
    $updateTraderStmt->close();

    // 11. Log record into Transactions table
    $txType = 'COPY_TRADE';
    $txMethod = "Copied: " . $trader['name'];
    $txStatus = 'COMPLETED';
    $negAmount = -$amount; 
    
    $insertTxStmt = $conn->prepare("INSERT INTO transactions (user_id, type, amount, method, status) VALUES (?, ?, ?, ?, ?)");
    $insertTxStmt->bind_param("isdss", $userId, $txType, $negAmount, $txMethod, $txStatus);
    $insertTxStmt->execute();
    $insertTxStmt->close();

    // Commit changes to the database
    $conn->commit();

    // Send Success Response back to Javascript
    echo json_encode([
        'status' => 'success',
        'message' => 'Successfully allocated ' . htmlspecialchars($user['sym']) . number_format($amount, 2) . ' to copy ' . htmlspecialchars($trader['name']) . '!'
    ]);

} catch (Exception $e) {
    $conn->rollback(); 
    // If you are still getting errors, uncomment the line below temporarily to see EXACTLY what MySQL is complaining about:
    // echo json_encode(['status' => 'error', 'message' => 'SQL Error: ' . $e->getMessage()]); exit();
    echo json_encode(['status' => 'error', 'message' => 'System error: Could not process copy trading request.']);
}
?>
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