<?php
/**
 * Tom's Java Jive - Create Stripe Checkout Session API
 * Uses hosted checkout page (redirects to Stripe)
 */

require_once __DIR__ . '/../includes/functions.php';
require_once __DIR__ . '/../includes/stripe.php';
require_once __DIR__ . '/../includes/loyalty.php';

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

// Only accept POST
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    jsonResponse(['error' => 'Method not allowed'], 405);
}

$input = json_decode(file_get_contents('php://input'), true);
$orderId = $input['order_id'] ?? '';
$originUrl = $input['origin_url'] ?? '';

if (empty($orderId)) {
    jsonResponse(['error' => 'Order ID required'], 400);
}

if (empty($originUrl)) {
    $originUrl = SITE_URL;
}

// Get order
$order = db()->fetch(
    "SELECT * FROM orders WHERE order_id = :id",
    ['id' => $orderId]
);

if (!$order) {
    jsonResponse(['error' => 'Order not found'], 404);
}

if ($order['payment_status'] === 'paid') {
    jsonResponse(['error' => 'Order already paid'], 400);
}

// Check if Stripe is configured
if (!isStripeConfigured()) {
    // Demo mode - simulate successful payment
    db()->update('orders',
        [
            'payment_status' => 'paid',
            'order_status' => 'confirmed',
            'stripe_payment_intent' => 'demo_' . bin2hex(random_bytes(8))
        ],
        'order_id = :id',
        ['id' => $orderId]
    );

    if (!empty($order['customer_id'])) {
        loyalty()->awardPoints(
            $order['customer_id'],
            (float) $order['total'],
            'Order #' . $order['order_number'],
            $orderId
        );
    }

    jsonResponse([
        'demo_mode' => true,
        'message' => 'Payment simulated (Stripe not configured)',
        'redirect' => '/order-confirmation.php?order=' . $orderId
    ]);
}

// Build line items from order
$items = json_decode($order['items'], true) ?? [];
$lineItems = [];

foreach ($items as $item) {
    $lineItems[] = [
        'name' => $item['name'],
        'price' => floatval($item['price']),
        'quantity' => intval($item['quantity']),
        'currency' => 'usd'
    ];
}

// Add shipping if applicable
if ($order['shipping_cost'] > 0) {
    $lineItems[] = [
        'name' => 'Shipping',
        'price' => floatval($order['shipping_cost']),
        'quantity' => 1,
        'currency' => 'usd'
    ];
}

// Build success/cancel URLs
$successUrl = rtrim($originUrl, '/') . '/order-confirmation.php?order=' . $orderId . '&session_id={CHECKOUT_SESSION_ID}';
$cancelUrl = rtrim($originUrl, '/') . '/payment.php?order=' . $orderId . '&cancelled=1';

try {
    $session = stripe()->createCheckoutSession(
        $lineItems,
        $successUrl,
        $cancelUrl,
        [
            'customer_email' => $order['customer_email'],
            'metadata' => [
                'order_id' => $orderId,
                'order_number' => $order['order_number']
            ]
        ]
    );
    
    // Store checkout session ID
    db()->update('orders',
        ['stripe_session_id' => $session['id']],
        'order_id = :id',
        ['id' => $orderId]
    );
    
    jsonResponse([
        'url' => $session['url'],
        'session_id' => $session['id']
    ]);
    
} catch (Exception $e) {
    error_log('Stripe Checkout error: ' . $e->getMessage());
    jsonResponse(['error' => 'Failed to create checkout session: ' . $e->getMessage()], 500);
}