<?php
// Shared helper functions for the FlixCooks food blog.

if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

require_once __DIR__ . '/config.php';

function init_db() {
    $pdo = get_db_connection();
    if (!$pdo) return;
    
    try {
        $pdo->exec("CREATE TABLE IF NOT EXISTS recipes (
            slug VARCHAR(255) PRIMARY KEY,
            data JSONB NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )");
        
        $stmt = $pdo->query("SELECT COUNT(*) FROM recipes");
        if ($stmt && $stmt->fetchColumn() == 0) {
            $path = __DIR__ . '/data/recipes.json';
            if (file_exists($path)) {
                $json = file_get_contents($path);
                $data = json_decode($json, true);
                if (is_array($data) && count($data) > 0) {
                    $insert = $pdo->prepare("INSERT INTO recipes (slug, data) VALUES (:slug, :data)");
                    foreach ($data as $recipe) {
                        if (isset($recipe['slug'])) {
                            $insert->execute([
                                'slug' => $recipe['slug'],
                                'data' => json_encode($recipe, JSON_UNESCAPED_UNICODE)
                            ]);
                        }
                    }
                }
            }
        }
    } catch (\Exception $e) {
        error_log("DB Init Error: " . $e->getMessage());
    }
}

function load_recipes_local(): array {
    $pdo = get_db_connection();
    $data = [];
    
    if (!$pdo) {
        $path = __DIR__ . '/data/recipes.json';
        if (file_exists($path)) {
            $json = file_get_contents($path);
            $data = json_decode($json, true) ?: [];
        }
    } else {
        static $initialized = false;
        if (!$initialized) {
            init_db();
            $initialized = true;
        }
        
        try {
            $stmt = $pdo->query("SELECT data FROM recipes");
            if ($stmt) {
                while ($row = $stmt->fetch()) {
                    $recipe = json_decode($row['data'], true);
                    if (is_array($recipe)) {
                        $data[] = $recipe;
                    }
                }
            }
        } catch (\Exception $e) {
            error_log("Failed to load recipes from DB: " . $e->getMessage());
        }
    }

    foreach ($data as &$recipe) {
        if (!empty($recipe['hero']) && is_string($recipe['hero'])) {
            $recipe['hero'] = normalize_asset_path($recipe['hero']);
        }
    }
    unset($recipe);

    return $data;
}

function load_recipes(): array {
    return load_recipes_local();
}

function load_recipe_by_slug(string $slug): ?array {
    return find_recipe_by_slug(load_recipes_local(), $slug);
}

function save_recipes(array $recipes): bool {
    $pdo = get_db_connection();
    $path = __DIR__ . '/data/recipes.json';
    
    if (!$pdo) {
        $json = json_encode($recipes, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
        return (bool) file_put_contents($path, $json);
    }
    
    try {
        $pdo->beginTransaction();
        $slugs = [];
        $insert = $pdo->prepare("INSERT INTO recipes (slug, data) VALUES (:slug, :data) ON CONFLICT (slug) DO UPDATE SET data = EXCLUDED.data, updated_at = CURRENT_TIMESTAMP");
        
        foreach ($recipes as $recipe) {
            if (isset($recipe['slug'])) {
                $slugs[] = $recipe['slug'];
                $insert->execute([
                    'slug' => $recipe['slug'],
                    'data' => json_encode($recipe, JSON_UNESCAPED_UNICODE)
                ]);
            }
        }
        
        if (!empty($slugs)) {
            $placeholders = implode(',', array_fill(0, count($slugs), '?'));
            $delete = $pdo->prepare("DELETE FROM recipes WHERE slug NOT IN ($placeholders)");
            $delete->execute($slugs);
        } else {
            $pdo->exec("DELETE FROM recipes");
        }
        
        $pdo->commit();
        
        // Also update local JSON as backup
        $json = json_encode($recipes, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
        file_put_contents($path, $json);
        
        return true;
    } catch (Exception $e) {
        if ($pdo->inTransaction()) {
            $pdo->rollBack();
        }
        error_log("Failed to save recipes to DB: " . $e->getMessage());
        return false;
    }
}

/**
 * Default settings for imprint and privacy pages.
 */
function default_site_settings(): array {
    $today = date('Y-m-d');
    return [
        'imprint' => [
            'de' => [
                'owner_name' => 'FlixCooks (bitte anpassen)',
                'address' => 'Straße Hausnummer, PLZ Ort, Österreich',
                'email' => 'contact@flixcooks.at',
                'phone' => '+43 660 0000000',
                'legal_form' => 'Kleines Impressum; kein Firmenbucheintrag/UID hinterlegt.',
                'business_purpose' => 'Foodblog & Rezeptmarketing.',
                'wko_membership' => '',
                'authority' => '',
                'uid' => '',
                'odr' => 'https://ec.europa.eu/consumers/odr',
                'last_updated' => $today,
            ],
            'en' => [
                'owner_name' => 'FlixCooks (please update)',
                'address' => 'Street number, ZIP City, Austria',
                'email' => 'contact@flixcooks.at',
                'phone' => '+43 660 0000000',
                'legal_form' => 'Small website notice; no commercial register/UID provided.',
                'business_purpose' => 'Food blog & recipe marketing.',
                'wko_membership' => '',
                'authority' => '',
                'uid' => '',
                'odr' => 'https://consumer-redress.ec.europa.eu/',
                'last_updated' => $today,
            ],
        ],
        'privacy' => [
            'de' => [
                'controller' => 'FlixCooks (bitte anpassen)',
                'contact_email' => 'contact@flixcooks.at',
                'contact_phone' => '+43 660 0000000',
                'address' => 'Straße Hausnummer, PLZ Ort, Österreich',
                'hosting_provider' => 'Hetzner Online GmbH, Industriestr. 25, 91710 Gunzenhausen, Deutschland',
                'log_retention_days' => 30,
                'cookie_statement' => 'Keine Tracking- oder Marketing-Cookies; nur technisch notwendige.',
                'purposes' => 'Betrieb und Bereitstellung der Website, Beantwortung von Kontaktanfragen.',
                'last_updated' => $today,
            ],
            'en' => [
                'controller' => 'FlixCooks (please update)',
                'contact_email' => 'contact@flixcooks.at',
                'contact_phone' => '+43 660 0000000',
                'address' => 'Street number, ZIP City, Austria',
                'hosting_provider' => 'Hetzner Online GmbH, Industriestr. 25, 91710 Gunzenhausen, Germany',
                'log_retention_days' => 30,
                'cookie_statement' => 'No tracking or marketing cookies; only technically necessary cookies.',
                'purposes' => 'Operating and providing the website, responding to contact requests.',
                'last_updated' => $today,
            ],
        ],
    ];
}

/**
 * Load site-wide settings for legal pages, merging with defaults.
 */
function load_site_settings(): array {
    $defaults = default_site_settings();
    $path = __DIR__ . '/data/site.json';
    if (!file_exists($path)) {
        return $defaults;
    }
    $raw = file_get_contents($path);
    $data = json_decode($raw, true);
    if (!is_array($data)) {
        return $defaults;
    }
    return array_replace_recursive($defaults, $data);
}

/**
 * Persist site-wide settings for legal pages.
 */
function save_site_settings(array $settings): bool {
    $path = __DIR__ . '/data/site.json';
    $json = json_encode($settings, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    return (bool) file_put_contents($path, $json);
}

function slugify(string $text): string {
    $text = strtolower($text);
    $text = preg_replace('~[^a-z0-9]+~', '-', $text);
    $text = trim($text, '-');
    return $text ?: uniqid('recipe-');
}

function find_recipe_by_slug(array $recipes, string $slug): ?array {
    foreach ($recipes as $recipe) {
        if (($recipe['slug'] ?? '') === $slug) {
            return $recipe;
        }
    }
    return null;
}

function localize_recipe(array $recipe, string $lang): array {
    $localized = $recipe;
    $i18n = $recipe['i18n'][$lang] ?? ($recipe['i18n']['en'] ?? []);
    foreach ($i18n as $key => $value) {
        $localized[$key] = $value;
    }
    return $localized;
}

function localize_recipes(array $recipes, string $lang): array {
    return array_map(function ($recipe) use ($lang) {
        return localize_recipe($recipe, $lang);
    }, $recipes);
}

function filter_recipes(array $recipes, ?string $query = null, ?string $tag = null, string $lang = 'en'): array {
    $query = $query ? strtolower($query) : null;
    $tag = $tag ? strtolower($tag) : null;

    $localized = localize_recipes($recipes, $lang);

    return array_values(array_filter($localized, function ($recipe) use ($query, $tag) {
        $matchesQuery = true;
        if ($query) {
            $haystack = strtolower(($recipe['title'] ?? '') . ' ' . ($recipe['description'] ?? ''));
            $matchesQuery = strpos($haystack, $query) !== false;
        }

        $matchesTag = true;
        if ($tag) {
            $tags = array_map('strtolower', $recipe['tags'] ?? []);
            $matchesTag = in_array($tag, $tags, true);
        }

        return $matchesQuery && $matchesTag;
    }));
}

function format_minutes(int $minutes): string {
    if ($minutes < 60) {
        return $minutes . ' min';
    }
    $hours = intdiv($minutes, 60);
    $mins = $minutes % 60;
    return $hours . ' hr' . ($hours > 1 ? 's ' : ' ') . ($mins ? $mins . ' min' : '');
}

function e(?string $value): string {
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}

function normalize_asset_path(string $path): string {
    if (!str_starts_with($path, '/assets/')) {
        return $path;
    }

    $absolute = __DIR__ . $path;
    if (file_exists($absolute)) {
        return $path;
    }

    $dir = dirname($absolute);
    $target = basename($absolute);
    if (!is_dir($dir)) {
        return $path;
    }

    foreach (scandir($dir) ?: [] as $entry) {
        if (strcasecmp($entry, $target) === 0) {
            return rtrim(dirname($path), '/') . '/' . $entry;
        }
    }

    return $path;
}

/**
 * Build a URL to the current path with a specific language parameter, preserving other query params.
 */
function lang_url(string $lang): string {
    $params = $_GET;
    $params['lang'] = $lang;
    $path = strtok($_SERVER['REQUEST_URI'], '?') ?: '/';
    return $path . '?' . http_build_query($params);
}

// Fallback polyfills for environments without mbstring extension
if (!function_exists('mb_substr')) {
    function mb_substr(string $string, int $start, ?int $length = null, ?string $encoding = null): string {
        return substr($string, $start, $length ?? strlen($string));
    }
}

if (!function_exists('mb_strlen')) {
    function mb_strlen(string $string, ?string $encoding = null): int {
        return strlen($string);
    }
}