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Viewing File: process_payment.php

<?php
session_start();
require 'db.php'; // Connect to the database

// 1. Redirect if accessed directly without submitting the form
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    header('Location: index.php');
    exit;
}

// 2. Retrieve Form Data
$firstName = trim($_POST['first_name'] ?? '');
$lastName  = trim($_POST['last_name'] ?? '');
$email     = trim($_POST['email'] ?? '');
$total     = $_POST['final_total'] ?? 0.00;
$method    = $_POST['payment_method'] ?? 'Unknown';
$notes     = trim($_POST['order_notes'] ?? '');
$currency  = $_SESSION['checkout_currency'] ?? '£';

// Handle Contact Preferences (Combine checkboxes into a string)
$prefs = [];
if (isset($_POST['pref_email'])) $prefs[] = 'Email';
if (isset($_POST['pref_phone'])) $prefs[] = 'Phone';
if (isset($_POST['pref_post']))  $prefs[] = 'Post';
if (isset($_POST['pref_sms']))   $prefs[] = 'SMS';
$contactPreferences = implode(', ', $prefs);

// Combine Notes and Prefs for storage
$fullNotes = "Order Notes: $notes | Contact via: $contactPreferences";

// Retrieve Cart
$cartItems = $_SESSION['checkout_cart'] ?? [];
if (empty($cartItems)) {
    die("Error: Your cart is empty.");
}

// 3. Handle File Upload (Payment Proof)
$uploadDir = 'uploads/proofs/';
$proofPath = null;

// Create folder if it doesn't exist
if (!is_dir($uploadDir)) {
    mkdir($uploadDir, 0777, true);
}

if (isset($_FILES['payment_proof']) && $_FILES['payment_proof']['error'] === UPLOAD_ERR_OK) {
    $fileTmpPath = $_FILES['payment_proof']['tmp_name'];
    $fileName    = $_FILES['payment_proof']['name'];
    
    // Sanitize filename and create unique path
    $newFileName = time() . '_' . preg_replace('/[^a-zA-Z0-9-_\.]/', '', $fileName);
    $dest_path   = $uploadDir . $newFileName;

    if(move_uploaded_file($fileTmpPath, $dest_path)) {
        $proofPath = $dest_path;
    }
}

try {
    // START TRANSACTION
    $pdo->beginTransaction();

    // A. Check if User exists, otherwise create new
    $stmt = $pdo->prepare("SELECT user_id FROM users WHERE email = ?");
    $stmt->execute([$email]);
    $user = $stmt->fetch();

    if ($user) {
        $userId = $user['user_id'];
    } else {
        // Create new user (using dummy password for guest checkout)
        $dummyPass = password_hash('Guest@1234', PASSWORD_DEFAULT);
        $stmt = $pdo->prepare("INSERT INTO users (first_name, last_name, email, password_hash) VALUES (?, ?, ?, ?)");
        $stmt->execute([$firstName, $lastName, $email, $dummyPass]);
        $userId = $pdo->lastInsertId();
    }

    // B. Create Donation Record
    // Generates a unique Transaction ID (e.g., GRB-65A12B...)
    $txnRef = 'GRB-' . strtoupper(substr(md5(uniqid()), 0, 8));

    $stmt = $pdo->prepare("INSERT INTO donations 
        (user_id, total_amount, currency, payment_method, transaction_ref, payment_status, donor_email, donor_name, message) 
        VALUES (?, ?, ?, ?, ?, 'pending', ?, ?, ?)");
    
    $fullName = $firstName . ' ' . $lastName;
    
    // Combine notes and proof path into the message field
    $finalMessage = $fullNotes . " | Proof File: " . ($proofPath ? $proofPath : 'None');

    $stmt->execute([$userId, $total, $currency, $method, $txnRef, $email, $fullName, $finalMessage]);
    $donationId = $pdo->lastInsertId();

    // ---------------------------------------------------------
    // C. Insert Cart Items (FIXED SECTION)
    // ---------------------------------------------------------
    $stmtItem = $pdo->prepare("INSERT INTO donation_items (donation_id, campaign_id, amount, frequency) VALUES (?, ?, ?, ?)");
    
    // Logic to look up the correct Campaign ID based on the title
    $stmtFindId = $pdo->prepare("SELECT campaign_id FROM campaigns WHERE title = ? LIMIT 1");

    foreach ($cartItems as $item) {
        $causeName = $item['cause']; 
        
        // Find ID
        $stmtFindId->execute([$causeName]);
        $row = $stmtFindId->fetch();

        if ($row) {
            $campaignId = $row['campaign_id'];
        } else {
            // Fallback to ID 1 (General Fund) if the specific cause isn't found
            $campaignId = 1; 
        }
        
        $stmtItem->execute([
            $donationId,
            $campaignId,
            $item['amt'],
            strtolower($item['freq'])
        ]);
    }

    // COMMIT CHANGES
    $pdo->commit();

    // D. Clean up Session
    unset($_SESSION['checkout_cart']);
    unset($_SESSION['checkout_currency']);

    // E. Redirect to Success Page
    header("Location: success.php?tid=" . $txnRef);
    exit;

} catch (Exception $e) {
    $pdo->rollBack();
    die("Transaction Failed: " . $e->getMessage());
}
?>
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