<?php
// food/cart/quote.php — يحسب السعر من الخادم فقط ويوقّعه لمدة 10 دقائق
// body: merchant_id, items:[{item_id, quantity, options:[{option_group_id, choice_ids:[]}]}]
require_once __DIR__ . '/../connect_app.php';

$merchantId = filterRequest('merchant_id', 'int');
$itemsRaw   = json_decode(filterRequest('items') ?? '[]', true);
if (!$merchantId || !$itemsRaw || !is_array($itemsRaw)) {
    jsonError('merchant_id and items are required');
}

$merchantSt = $food_con->prepare(
    "SELECT id, min_order_amount, is_open_override, working_hours FROM food_merchants WHERE id=? AND status='active' LIMIT 1"
);
$merchantSt->execute([$merchantId]);
$merchant = $merchantSt->fetch();
if (!$merchant) jsonError('Merchant not found', 404);
if (!foodIsMerchantOpen($merchant)) jsonError('Merchant is currently closed', 409);

$lines = [];
$itemsTotal = 0;

foreach ($itemsRaw as $line) {
    $itemId   = (int)($line['item_id'] ?? 0);
    $quantity = max(1, (int)($line['quantity'] ?? 1));
    if (!$itemId) jsonError('Invalid item in cart');

    $itemSt = $food_con->prepare(
        "SELECT id, merchant_id, name_ar, price, is_available FROM food_menu_items WHERE id=? LIMIT 1"
    );
    $itemSt->execute([$itemId]);
    $item = $itemSt->fetch();
    if (!$item || (int)$item['merchant_id'] !== $merchantId) jsonError("Item $itemId does not belong to this merchant", 400);
    if (!$item['is_available']) jsonError("{$item['name_ar']} is currently unavailable", 409);

    $optionsSt = $food_con->prepare("SELECT id, choices, is_required, max_select FROM food_item_options WHERE item_id=?");
    $optionsSt->execute([$itemId]);
    $optionGroups = $optionsSt->fetchAll();

    $chosenOptionsOut = [];
    $optionsTotalPerUnit = 0;
    $requestedGroups = $line['options'] ?? [];

    foreach ($optionGroups as $group) {
        $choices     = json_decode($group['choices'], true) ?: [];
        $choiceById  = array_column($choices, null, 'id');
        $requested   = null;
        foreach ($requestedGroups as $rg) {
            if ((int)($rg['option_group_id'] ?? 0) === (int)$group['id']) { $requested = $rg; break; }
        }
        $choiceIds = $requested['choice_ids'] ?? [];

        if ($group['is_required'] && empty($choiceIds)) {
            jsonError("Required option group missing for item {$item['name_ar']}", 400);
        }
        if (count($choiceIds) > (int)$group['max_select']) {
            jsonError("Too many choices selected for item {$item['name_ar']}", 400);
        }

        foreach ($choiceIds as $cid) {
            if (!isset($choiceById[$cid])) jsonError("Invalid option choice for item {$item['name_ar']}", 400);
            $optionsTotalPerUnit += (int)$choiceById[$cid]['price'];
            $chosenOptionsOut[] = ['group_id' => (int)$group['id'], 'choice_id' => $cid, 'price' => (int)$choiceById[$cid]['price']];
        }
    }

    $unitPrice = (int)$item['price'] + $optionsTotalPerUnit;
    $lineTotal = $unitPrice * $quantity;
    $itemsTotal += $lineTotal;

    $lines[] = [
        'item_id'          => $itemId,
        'name_ar_snapshot' => $item['name_ar'],
        'unit_price'       => $unitPrice,
        'quantity'         => $quantity,
        'options'          => $chosenOptionsOut,
        'line_total'       => $lineTotal,
    ];
}

if ($itemsTotal < (int)$merchant['min_order_amount']) {
    jsonError('Order does not meet minimum order amount', 409, ['min_order_amount' => (int)$merchant['min_order_amount']]);
}

// رسم التوصيل — ثابت من env حتى يُربط بمحرك التسعير القائم في مرحلة لاحقة
$deliveryFee = (int)(getenv('FOOD_DELIVERY_BASE_FEE') ?: 1000);
$serviceFee  = 0;
$grandTotal  = $itemsTotal + $deliveryFee + $serviceFee;

$quote = [
    'merchant_id'  => $merchantId,
    'passenger_id' => $food_passenger_id,
    'lines'        => $lines,
    'items_total'  => $itemsTotal,
    'delivery_fee' => $deliveryFee,
    'service_fee'  => $serviceFee,
    'grand_total'  => $grandTotal,
];

$token = foodSignQuote($quote);

jsonSuccess([
    'quote_token' => $token,
    'items_total' => $itemsTotal,
    'delivery_fee' => $deliveryFee,
    'service_fee' => $serviceFee,
    'grand_total' => $grandTotal,
    'lines' => $lines,
    'expires_in' => 600,
]);