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

function load_recipes(): array {
    $path = __DIR__ . '/data/recipes.json';
    if (!file_exists($path)) {
        return [];
    }
    $json = file_get_contents($path);
    $data = json_decode($json, true);
    if (!is_array($data)) {
        return [];
    }

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

    return $data;
}

function save_recipes(array $recipes): bool {
    $path = __DIR__ . '/data/recipes.json';
    $json = json_encode($recipes, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
    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);
}