<?php
header('Content-Type: application/json; charset=utf-8');

$keyword = '';
if (isset($_GET['q'])) {
    $keyword = trim($_GET['q']);
} elseif (isset($_POST['q'])) {
    $keyword = trim($_POST['q']);
}

$category = isset($_GET['category']) ? trim($_GET['category']) : '';

$jsonFile = __DIR__ . '/products.json';
$products = [];
if (file_exists($jsonFile)) {
    $decoded = json_decode(file_get_contents($jsonFile), true);
    if (is_array($decoded)) {
        $products = $decoded;
    }
}

$filtered = array_filter($products, function ($item) use ($keyword, $category) {
    if ($category !== '' && mb_strtolower($item['category'], 'UTF-8') !== mb_strtolower($category, 'UTF-8')) {
        return false;
    }
    if ($keyword === '') {
        return true;
    }
    $kwLower = mb_strtolower($keyword, 'UTF-8');
    $haystack = mb_strtolower(
        ($item['code'] ?? '') . ' ' . ($item['name'] ?? '') . ' ' . ($item['category'] ?? '') . ' ' . ($item['brand'] ?? ''),
        'UTF-8'
    );
    return mb_strpos($haystack, $kwLower) !== false;
});

echo json_encode([
    'status' => 'success',
    'keyword' => $keyword,
    'category' => $category,
    'count' => count($filtered),
    'products' => array_values($filtered)
], JSON_UNESCAPED_UNICODE);