<?php
/**
 * Admin functionality.
 *
 * @package WP_Recache
 */

defined('ABSPATH') || exit;

class WP_Recache_Admin {

    /**
     * Initialize admin hooks.
     */
    public function init() {
        add_action('admin_menu', [$this, 'add_admin_menu']);
        add_action('admin_init', [$this, 'register_settings']);
        add_action('admin_bar_menu', [$this, 'add_admin_bar_button'], 100);
        add_action('wp_ajax_wp_recache_purge_all', [$this, 'ajax_purge_all']);
        add_action('wp_ajax_wp_recache_purge_url', [$this, 'ajax_purge_url']);
        add_action('admin_notices', [$this, 'admin_notices']);
        add_action('admin_enqueue_scripts', 'wp_recache_enqueue_admin_bar_script');
        // New exclusions must not leave stale files that the drop-in would still serve.
        add_action('update_option_wp_recache_exclude_urls', 'wp_recache_delete_all_cache');
    }

    /**
     * Add admin menu page.
     */
    public function add_admin_menu() {
        add_options_page(
            'WP Recache',
            'WP Recache',
            'manage_options',
            'wp-recache',
            [$this, 'settings_page']
        );
    }

    /**
     * Register settings.
     */
    public function register_settings() {
        register_setting('wp_recache_settings', 'wp_recache_cache_enabled', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => true,
        ]);

        register_setting('wp_recache_settings', 'wp_recache_separate_mobile_cache', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => false,
        ]);

        register_setting('wp_recache_settings', 'wp_recache_exclude_urls', [
            'type' => 'array',
            'sanitize_callback' => [$this, 'sanitize_exclude_urls'],
            'default' => ['/cart', '/checkout', '/my-account'],
        ]);

        register_setting('wp_recache_settings', 'wp_recache_minify_css', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => false,
        ]);

        register_setting('wp_recache_settings', 'wp_recache_minify_js', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => false,
        ]);

        register_setting('wp_recache_settings', 'wp_recache_lazyload_images', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => false,
        ]);

        register_setting('wp_recache_settings', 'wp_recache_preload_enabled', [
            'type' => 'boolean',
            'sanitize_callback' => 'rest_sanitize_boolean',
            'default' => false,
        ]);
    }

    /**
     * Sanitize exclude URLs.
     *
     * @param mixed $input Input value.
     * @return array Sanitized URLs.
     */
    public function sanitize_exclude_urls($input) {
        if (is_array($input)) {
            $input = implode("\n", $input);
        }

        $lines = array_filter(array_map('trim', explode("\n", (string) $input)));

        return array_map('sanitize_text_field', $lines);
    }

    /**
     * Render settings page.
     */
    public function settings_page() {
        if (!current_user_can('manage_options')) {
            return;
        }

        $active_tab = isset($_GET['tab']) ? sanitize_text_field($_GET['tab']) : 'cache';

        if (!in_array($active_tab, ['cache', 'optimize', 'advanced'], true)) {
            $active_tab = 'cache';
        }

        include WP_RECACHE_INC_PATH . 'Admin/views/settings.php';
    }

    /**
     * Add admin bar purge button.
     *
     * @param WP_Admin_Bar $admin_bar Admin bar instance.
     */
    public function add_admin_bar_button($admin_bar) {
        if (!is_user_logged_in()) {
            return;
        }

        $admin_bar->add_menu([
            'id' => 'wp-recache',
            'title' => 'WP Recache',
            'href' => admin_url('options-general.php?page=wp-recache'),
        ]);

        $admin_bar->add_menu([
            'id' => 'wp-recache-purge-all',
            'parent' => 'wp-recache',
            'title' => 'Purge All Cache',
            'href' => '#',
            'meta' => [
                'onclick' => 'wpRecachePurgeAll();',
            ],
        ]);
    }

    /**
     * AJAX handler for purging all cache.
     */
    public function ajax_purge_all() {
        check_ajax_referer('wp_recache_nonce', 'nonce');

        if (!current_user_can('manage_options')) {
            wp_send_json_error('Unauthorized');
        }

        wp_recache_delete_all_cache();

        wp_send_json_success('Cache purged successfully');
    }

    /**
     * AJAX handler for purging URL cache.
     */
    public function ajax_purge_url() {
        check_ajax_referer('wp_recache_nonce', 'nonce');

        if (!current_user_can('manage_options')) {
            wp_send_json_error('Unauthorized');
        }

        $url = isset($_POST['url']) ? esc_url_raw($_POST['url']) : '';

        if (empty($url)) {
            wp_send_json_error('No URL provided');
        }

        wp_recache_delete_cache($url);

        wp_send_json_success('URL cache purged successfully');
    }

    /**
     * Display admin notices.
     */
    public function admin_notices() {
        $screen = get_current_screen();

        if (!$screen || $screen->id !== 'settings_page_wp-recache') {
            return;
        }

        if (isset($_GET['settings-updated'])) {
            echo '<div class="notice notice-success"><p>Settings saved.</p></div>';
        }
    }

    /**
     * Get cache statistics.
     *
     * @return array Cache statistics.
     */
    public static function get_cache_stats() {
        $cache_path = WP_RECACHE_CACHE_PATH;

        if (!is_dir($cache_path)) {
            return [
                'files' => 0,
                'size' => 0,
                'size_formatted' => '0 B',
            ];
        }

        $files = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($cache_path, RecursiveDirectoryIterator::SKIP_DOTS)
        );

        $count = 0;
        $size = 0;

        foreach ($files as $file) {
            if ($file->isFile()) {
                $count++;
                $size += $file->getSize();
            }
        }

        return [
            'files' => $count,
            'size' => $size,
            'size_formatted' => size_format($size),
        ];
    }
}