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Viewing File: trade_asset.php

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

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

// 1. Check Authentication
if (!isset($_SESSION['Email'])) {
    echo "<script>alert('Session expired. Please log in again.'); window.location.href='../../../index.php';</script>";
    exit();
}

$user = GetMember1($_SESSION['Email']);
if (!$user) {
    echo "<script>alert('User not found.'); window.location.href='../../../index.php';</script>";
    exit();
}

// 2. Validate Request Method
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    header("Location: markets.php");
    exit();
}

$userId = $user['ID'];

// ==========================================
// FIX: WE NOW USE `Capital` INSTEAD OF `wallet`
// ==========================================
$userFiatBalance = floatval($user['Capital']); 

// 3. Sanitize and Validate POST Data
$tradeType = isset($_POST['trade_type']) ? strtolower(trim($_POST['trade_type'])) : '';
$assetSymbol = isset($_POST['asset_symbol']) ? strtoupper(trim($_POST['asset_symbol'])) : '';
$fromAmount = isset($_POST['from_amount']) ? floatval($_POST['from_amount']) : 0;
$toAmount = isset($_POST['to_amount']) ? floatval($_POST['to_amount']) : 0;

if (empty($assetSymbol) || $fromAmount <= 0 || $toAmount <= 0 || !in_array($tradeType, ['buy', 'sell'])) {
    echo "<script>alert('Invalid trade parameters. Please check your amounts.'); window.location.href='markets.php';</script>";
    exit();
}

try {
    // Start Database Transaction to ensure money is safely moved
    $conn->begin_transaction();

    // Fetch user's current crypto balance for this specific asset from user_assets table
    $cryptoBalance = 0.00000000;
    $stmtAsset = $conn->prepare("SELECT balance FROM user_assets WHERE user_id = ? AND asset_symbol = ? FOR UPDATE");
    $stmtAsset->bind_param("is", $userId, $assetSymbol);
    $stmtAsset->execute();
    $resultAsset = $stmtAsset->get_result();
    
    if ($row = $resultAsset->fetch_assoc()) {
        $cryptoBalance = floatval($row['balance']);
    }
    $stmtAsset->close();

    // ==========================================
    // LOGIC: BUYING CRYPTO (Paying with Capital)
    // ==========================================
    if ($tradeType === 'buy') {
        if ($fromAmount > $userFiatBalance) {
            $conn->rollback();
            echo "<script>alert('Insufficient Capital! You only have " . $user['sym'] . number_format($userFiatBalance, 2) . " available to buy assets.'); window.location.href='markets.php';</script>";
            exit();
        }

        // Deduct from Capital
        $newFiatBalance = $userFiatBalance - $fromAmount;
        // Add to Crypto Balance
        $newCryptoBalance = $cryptoBalance + $toAmount;

    // ==========================================
    // LOGIC: SELLING CRYPTO (Receiving Capital)
    // ==========================================
    } else {
        if ($fromAmount > $cryptoBalance) {
            $conn->rollback();
            echo "<script>alert('Insufficient Crypto Balance! You only have " . number_format($cryptoBalance, 8) . " " . $assetSymbol . " available to sell.'); window.location.href='markets.php';</script>";
            exit();
        }

        // Deduct from Crypto Balance
        $newCryptoBalance = $cryptoBalance - $fromAmount;
        // Add to Capital
        $newFiatBalance = $userFiatBalance + $toAmount;
    }

    // 4. Update Fiat Balance (Capital) in legacy `members` table
    $stmtUpdateFiat = $conn->prepare("UPDATE members SET Capital = ? WHERE ID = ?");
    $newFiatString = strval($newFiatBalance);
    $stmtUpdateFiat->bind_param("si", $newFiatString, $userId);
    $stmtUpdateFiat->execute();
    $stmtUpdateFiat->close();

    // 5. Update or Insert Crypto Balance in `user_assets` table
    if ($resultAsset->num_rows > 0) {
        $stmtUpdateCrypto = $conn->prepare("UPDATE user_assets SET balance = ? WHERE user_id = ? AND asset_symbol = ?");
        $stmtUpdateCrypto->bind_param("dis", $newCryptoBalance, $userId, $assetSymbol);
        $stmtUpdateCrypto->execute();
        $stmtUpdateCrypto->close();
    } else {
        $stmtInsertCrypto = $conn->prepare("INSERT INTO user_assets (user_id, asset_symbol, balance) VALUES (?, ?, ?)");
        $stmtInsertCrypto->bind_param("isd", $userId, $assetSymbol, $newCryptoBalance);
        $stmtInsertCrypto->execute();
        $stmtInsertCrypto->close();
    }

    // 6. Record the transaction history (Optional but recommended)
    $txType = strtoupper($tradeType) . '_' . $assetSymbol;
    $txMethod = "Market Spot Exchange";
    $txStatus = "COMPLETED";
    // For Buy: Amount is negative fiat. For Sell: Amount is positive fiat.
    $txFiatAmount = ($tradeType === 'buy') ? -$fromAmount : $toAmount;
    
    $stmtTx = $conn->prepare("INSERT INTO transactions (user_id, type, amount, method, status) VALUES (?, ?, ?, ?, ?)");
    $stmtTx->bind_param("isdss", $userId, $txType, $txFiatAmount, $txMethod, $txStatus);
    $stmtTx->execute();
    $stmtTx->close();

    // 7. Commit changes to database
    $conn->commit();

    // 8. Redirect with Success Message
    $actionText = ($tradeType === 'buy') ? "bought" : "sold";
    $successMessage = "Successfully " . $actionText . " " . $assetSymbol . "!";
    echo "<script>alert('" . $successMessage . "'); window.location.href='markets.php';</script>";

} catch (Exception $e) {
    $conn->rollback();
    echo "<script>alert('System Error: Could not process trade.'); window.location.href='markets.php';</script>";
}
?>
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