<?php

declare(strict_types=1);

/**
 * Wspólne funkcje cache/upstream menu (api/menu.php + scripts/refresh_menu_cache.php).
 */

function menuCacheDir(): string
{
    $dir = __DIR__ . '/cache';
    if (!is_dir($dir)) {
        @mkdir($dir, 0755, true);
    }

    return $dir;
}

function menuCachePath(string $lang): string
{
    $safe = preg_replace('/[^a-z0-9_-]/i', '', strtolower($lang)) ?: 'pl';

    return menuCacheDir() . '/menu_' . $safe . '.json';
}

function menuFingerprintPath(): string
{
    return menuCacheDir() . '/menu_pl_fingerprint.txt';
}

function readMenuCache(string $cacheFile): ?array
{
    if (!is_file($cacheFile)) {
        return null;
    }

    $raw = file_get_contents($cacheFile);
    if ($raw === false || $raw === '') {
        return null;
    }

    $decoded = json_decode($raw, true);

    return is_array($decoded) ? $decoded : null;
}

function writeMenuCache(string $cacheFile, array $payload): void
{
    file_put_contents(
        $cacheFile,
        json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
        LOCK_EX
    );
}

function fetchUpstreamMenu(string $url, int $timeout): ?array
{
    $body = false;
    $httpCode = 0;

    if (function_exists('curl_init')) {
        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_TIMEOUT => $timeout,
            CURLOPT_HTTPHEADER => ['Accept: application/json'],
        ]);
        $body = curl_exec($ch);
        $errno = curl_errno($ch);
        $httpCode = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        if ($errno !== 0) {
            $body = false;
        }
    } else {
        $context = stream_context_create([
            'http' => [
                'method' => 'GET',
                'timeout' => $timeout,
                'header' => "Accept: application/json\r\n",
                'ignore_errors' => true,
            ],
        ]);
        $body = @file_get_contents($url, false, $context);
        if (isset($http_response_header[0]) && preg_match('/\s(\d{3})\s/', $http_response_header[0], $m)) {
            $httpCode = (int) $m[1];
        }
    }

    if ($body === false || ($httpCode > 0 && ($httpCode < 200 || $httpCode >= 300))) {
        return null;
    }

    $decoded = json_decode($body, true);

    return is_array($decoded) ? $decoded : null;
}

function mapUpstreamMenu(array $raw, string $lang, string $source): array
{
    $categories = [];
    foreach ($raw['categories'] ?? [] as $cat) {
        if (!is_array($cat)) {
            continue;
        }
        $id = trim((string) ($cat['id'] ?? ''));
        $name = trim((string) ($cat['name'] ?? ''));
        if ($id === '' || $name === '') {
            continue;
        }
        $categories[] = ['id' => $id, 'name' => $name];
    }

    $sections = [];
    foreach ($raw['tables'] ?? [] as $table) {
        if (!is_array($table)) {
            continue;
        }
        $sectionName = trim((string) ($table['name'] ?? ''));
        if ($sectionName === '') {
            continue;
        }

        $items = [];
        foreach ($table['items'] ?? [] as $item) {
            if (!is_array($item)) {
                continue;
            }
            $items[] = [
                'position' => (string) ($item['id'] ?? ''),
                'categoryId' => (string) ($item['category'] ?? ''),
                'tag' => '',
                'image' => (string) ($item['image'] ?? ''),
                'title' => trim((string) ($item['name'] ?? '')),
                'description' => trim((string) ($item['name_extra'] ?? '')),
                'price' => (string) ($item['price'] ?? ''),
            ];
        }

        $sections[] = [
            'categoryName' => $sectionName,
            'items' => $items,
        ];
    }

    $payload = [
        'status' => 'success',
        'lang' => $lang,
        'source' => $source,
        'cachedAt' => gmdate('c'),
        'categories' => $categories,
        'sections' => $sections,
    ];

    $payload['contentFingerprint'] = menuContentFingerprint($payload);

    return $payload;
}

/**
 * Stabilny fingerprint treści tekstowych (bez cen/obrazków/daty cache).
 */
function menuContentFingerprint(array $menu): string
{
    $parts = [];

    foreach ($menu['categories'] ?? [] as $cat) {
        if (!is_array($cat)) {
            continue;
        }
        $parts[] = 'c|' . ($cat['id'] ?? '') . '|' . ($cat['name'] ?? '');
    }

    foreach ($menu['sections'] ?? [] as $section) {
        if (!is_array($section)) {
            continue;
        }
        $catName = (string) ($section['categoryName'] ?? '');
        $parts[] = 's|' . $catName;
        foreach ($section['items'] ?? [] as $item) {
            if (!is_array($item)) {
                continue;
            }
            $parts[] = implode('|', [
                'i',
                (string) ($item['categoryId'] ?? ''),
                (string) ($item['position'] ?? ''),
                (string) ($item['title'] ?? ''),
                (string) ($item['description'] ?? ''),
                $catName,
            ]);
        }
    }

    sort($parts, SORT_STRING);

    return hash('sha256', implode("\n", $parts));
}

/**
 * Mapa pozycji do tłumaczenia: key => [title, description, categoryName, categoryId, position, ...]
 */
function menuCollectTranslatableUnits(array $menu): array
{
    $units = [];
    $categoryNames = [];

    foreach ($menu['categories'] ?? [] as $cat) {
        if (!is_array($cat)) {
            continue;
        }
        $id = (string) ($cat['id'] ?? '');
        if ($id === '') {
            continue;
        }
        $categoryNames[$id] = (string) ($cat['name'] ?? '');
        $units['cat:' . $id] = [
            'type' => 'category',
            'id' => $id,
            'text' => (string) ($cat['name'] ?? ''),
        ];
    }

    foreach ($menu['sections'] ?? [] as $sIdx => $section) {
        if (!is_array($section)) {
            continue;
        }
        $catName = (string) ($section['categoryName'] ?? '');
        $units['sec:' . $sIdx] = [
            'type' => 'section',
            'index' => (int) $sIdx,
            'text' => $catName,
        ];

        foreach ($section['items'] ?? [] as $item) {
            if (!is_array($item)) {
                continue;
            }
            $cid = (string) ($item['categoryId'] ?? '');
            $pos = (string) ($item['position'] ?? '');
            $key = 'item:' . $cid . ':' . $pos;
            $units[$key] = [
                'type' => 'item',
                'categoryId' => $cid,
                'position' => $pos,
                'title' => (string) ($item['title'] ?? ''),
                'description' => (string) ($item['description'] ?? ''),
                'hash' => hash('sha256', ($item['title'] ?? '') . "\0" . ($item['description'] ?? '') . "\0" . $catName),
            ];
        }
    }

    return $units;
}

function menuApplyTranslations(array $plMenu, array $translations, string $lang): array
{
    $out = $plMenu;
    $out['lang'] = $lang;
    $out['source'] = 'ai';
    $out['cachedAt'] = gmdate('c');
    $out['sourceFingerprint'] = $plMenu['contentFingerprint'] ?? menuContentFingerprint($plMenu);

    foreach ($out['categories'] ?? [] as $i => $cat) {
        if (!is_array($cat)) {
            continue;
        }
        $id = (string) ($cat['id'] ?? '');
        $key = 'cat:' . $id;
        if (isset($translations[$key]['text'])) {
            $out['categories'][$i]['name'] = (string) $translations[$key]['text'];
        }
    }

    foreach ($out['sections'] ?? [] as $sIdx => $section) {
        if (!is_array($section)) {
            continue;
        }
        $secKey = 'sec:' . $sIdx;
        if (isset($translations[$secKey]['text'])) {
            $out['sections'][$sIdx]['categoryName'] = (string) $translations[$secKey]['text'];
        }

        foreach ($section['items'] ?? [] as $iIdx => $item) {
            if (!is_array($item)) {
                continue;
            }
            $cid = (string) ($item['categoryId'] ?? '');
            $pos = (string) ($item['position'] ?? '');
            $key = 'item:' . $cid . ':' . $pos;
            if (isset($translations[$key]['title'])) {
                $out['sections'][$sIdx]['items'][$iIdx]['title'] = (string) $translations[$key]['title'];
            }
            if (array_key_exists('description', $translations[$key] ?? [])) {
                $out['sections'][$sIdx]['items'][$iIdx]['description'] = (string) $translations[$key]['description'];
            }
        }
    }

    $out['contentFingerprint'] = menuContentFingerprint($out);

    return $out;
}

function loadMenuAiConfig(): ?array
{
    $path = __DIR__ . '/../config/menu_ai.local.php';
    if (!is_file($path)) {
        return null;
    }
    $cfg = require $path;

    return is_array($cfg) ? $cfg : null;
}