<?php

/**
 * Content API for PHP content files
 *
 * Provides a safe, read-only interface for PHP content files to access
 * CMS data (pages, menu, config, navigation, translations, search).
 * Only instantiated inside parsePHP() — never exposed via URL.
 */
class ContentAPI
{
    private CodePressCMS $cms;

    public function __construct(CodePressCMS $cms)
    {
        $this->cms = $cms;
    }

    /**
     * Get all pages as a flat array of path => title pairs
     *
     * @return array Associative array like ['index' => 'Home', 'over-ons' => 'Over ons']
     */
    public function getAllPages(): array
    {
        return $this->cms->getAllPageTitles();
    }

    /**
     * Get a single page by path, including title, content, layout, and metadata
     *
     * @param string $path Page path without extension (e.g. 'over-ons' or 'blog/post-1')
     * @return array|null Page data or null if not found
     */
    public function getPage(string $path): ?array
    {
        $contentDir = $this->cms->config['content_dir'];
        $path = preg_replace('/\.(md|php|html)$/', '', $path);
        $filePath = $contentDir . '/' . $path;

        $extensions = ['md', 'php', 'html'];
        $actualPath = null;
        foreach ($extensions as $ext) {
            if (file_exists($filePath . '.' . $ext)) {
                $actualPath = $filePath . '.' . $ext;
                break;
            }
        }

        if (!$actualPath || !file_exists($actualPath)) {
            return null;
        }

        $content = file_get_contents($actualPath);
        $extension = pathinfo($actualPath, PATHINFO_EXTENSION);

        switch ($extension) {
            case 'md':
                $result = $this->cms->parseMarkdown($content, $actualPath);
                break;
            case 'php':
                $result = $this->cms->parsePHP($actualPath);
                $result['content'] = $this->cms->processContent($result['content']);
                break;
            case 'html':
                $result = $this->cms->parseHTML($content, $actualPath);
                break;
            default:
                return null;
        }

        return [
            'title' => $result['title'] ?? '',
            'content' => $result['content'] ?? '',
            'path' => $path,
            'layout' => $result['layout'] ?? 'sidebar-content',
            'metadata' => $result['metadata'] ?? [],
        ];
    }

    /**
     * Get the navigation menu structure
     *
     * @return array Hierarchical menu array with 'title', 'path', 'children', 'active' keys
     */
    public function getMenu(): array
    {
        return $this->cms->getMenu();
    }

    /**
     * Get a config value using dot notation
     *
     * @param string $key Config key, e.g. 'site_title' or 'features.search'
     * @param mixed $default Default value if key is not found
     * @return mixed Config value or default
     */
    public function getConfig(string $key, $default = null)
    {
        $keys = explode('.', $key);
        $value = $this->cms->config;

        foreach ($keys as $k) {
            if (!isset($value[$k])) {
                return $default;
            }
            $value = $value[$k];
        }

        return $value;
    }

    /**
     * Get the current language code (e.g. 'nl' or 'en')
     *
     * @return string
     */
    public function getCurrentLanguage(): string
    {
        return $this->cms->currentLanguage;
    }

    /**
     * Build a URL for a page, optionally with a specific language and extra params
     *
     * @param string $page Page path (default 'index')
     * @param string|null $lang Language code (defaults to current language)
     * @param array $params Additional query parameters
     * @return string URL string starting with '?'
     */
    public function buildUrl(string $page = 'index', ?string $lang = null, array $params = []): string
    {
        $lang = $lang ?? $this->getCurrentLanguage();
        $query = 'page=' . urlencode($page) . '&lang=' . urlencode($lang);
        if (!empty($params)) {
            $query .= '&' . http_build_query($params);
        }
        return '?' . $query;
    }

    /**
     * Check if a page exists at the given path
     *
     * @param string $path Page path without extension
     * @return bool
     */
    public function pageExists(string $path): bool
    {
        $contentDir = $this->cms->config['content_dir'];
        $path = preg_replace('/\.(md|php|html)$/', '', $path);
        $basePath = $contentDir . '/' . $path;

        return file_exists($basePath . '.md')
            || file_exists($basePath . '.php')
            || file_exists($basePath . '.html');
    }

    /**
     * Get the title of the currently viewed page
     *
     * @return string
     */
    public function getCurrentPageTitle(): string
    {
        $page = $this->cms->getPage();
        return $page['title'] ?? '';
    }

    /**
     * Get the path of the currently viewed page
     *
     * @return string
     */
    public function getCurrentPagePath(): string
    {
        return $_GET['page'] ?? $this->cms->config['default_page'];
    }

    /**
     * Check if the current page is the homepage
     *
     * @return bool
     */
    public function isHomepage(): bool
    {
        $defaultPage = $this->cms->config['default_page'] ?? 'index';
        $currentPage = $_GET['page'] ?? $defaultPage;
        return $currentPage === $defaultPage;
    }

    /**
     * Translate a language key using the current language
     *
     * @param string $key Language key
     * @return string Translated text
     */
    public function t(string $key): string
    {
        return $this->cms->t($key);
    }

    /**
     * Get the site title from config
     *
     * @return string
     */
    public function getSiteTitle(): string
    {
        return $this->cms->config['site_title'] ?? 'CodePress';
    }

    /**
     * Get all available language codes
     *
     * @return array Language codes like ['nl', 'en']
     */
    public function getAvailableLanguages(): array
    {
        return $this->cms->getAvailableLanguages();
    }

    /**
     * Get search results for the current search query
     *
     * @return array Search results, or empty array if not searching
     */
    public function getSearchResults(): array
    {
        if (isset($_GET['search'])) {
            return $this->cms->searchResults;
        }
        return [];
    }

    /**
     * Check if a search is currently active
     *
     * @return bool
     */
    public function isSearching(): bool
    {
        return isset($_GET['search']);
    }

    /**
     * Get the author metadata for the current page.
     * Returns author_name, author_email and created from the page frontmatter.
     *
     * @return array Author metadata with keys: author_name, author_email, created
     */
    public function getPageAuthor(): array
    {
        $page = $this->cms->getPage();
        $metadata = $page['metadata'] ?? [];
        return [
            'author_name' => $metadata['author_name'] ?? '',
            'author_email' => $metadata['author_email'] ?? '',
            'created' => $metadata['created'] ?? '',
        ];
    }
}