<?php
/**
 * AI Search Admin Manager
 * 
 * Handles all admin interface functionality
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class AI_Search_Admin_Manager {
    
    /**
     * @var AI_Search_Settings_Pages
     */
    private $settings_pages;
    
    /**
     * @var AI_Search_Setup_Wizard
     */
    private $setup_wizard;

    /**
     * @var AI_Search_Post_Meta_Box
     */
    private $post_meta_box;

    /**
     * Initialize admin manager
     */
    public function __construct() {
        $this->load_dependencies();
        $this->init_components();
        $this->register_hooks();
    }

    /**
     * Load required files
     */
    private function load_dependencies() {
        require_once plugin_dir_path( __FILE__ ) . 'class-settings-pages.php';
        require_once plugin_dir_path( __FILE__ ) . 'class-setup-wizard.php';
        require_once plugin_dir_path( __FILE__ ) . 'class-post-meta-box.php';
    }

    /**
     * Initialize components
     */
    private function init_components() {
        $this->settings_pages = new AI_Search_Settings_Pages();
        $this->setup_wizard = new AI_Search_Setup_Wizard();
        $this->post_meta_box = new AI_Search_Post_Meta_Box();
    }
    
    /**
     * Register admin hooks
     */
    private function register_hooks() {
        add_action( 'admin_menu', [ $this, 'register_settings_menu' ] );
        add_action( 'admin_notices', [ $this->setup_wizard, 'show_setup_notice' ] );
        add_action( 'admin_notices', [ $this, 'show_domain_mismatch_notice' ] );
        add_action( 'admin_notices', [ $this, 'show_woocommerce_welcome_notice' ] );
        add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_admin_assets' ] );
        add_action( 'admin_enqueue_scripts', [ $this->setup_wizard, 'enqueue_scripts' ] );
        add_action( 'admin_head', [ $this, 'add_menu_icon_styles' ] );
        add_filter( 'parent_file', [ $this, 'fix_admin_parent_file' ] );
        add_filter( 'submenu_file', [ $this, 'fix_admin_submenu_file' ] );

        // Admin post actions
        add_action( 'admin_post_ai_search_generate_embeddings', [ $this->settings_pages, 'generate_selected_embeddings' ] );
        add_action( 'admin_post_ai_search_clear_cache', [ $this->settings_pages, 'clear_embeddings_cache' ] );
        add_action( 'admin_post_ai_search_clear_cache_filtered', [ $this->settings_pages, 'clear_embeddings_cache_filtered' ] );
        add_action( 'admin_post_ai_search_validate_token', [ $this->settings_pages, 'validate_service_token' ] );
        add_action( 'admin_post_ai_search_save_custom_fields', [ $this->settings_pages, 'save_custom_fields_settings' ] );
        add_action( 'admin_post_ai_search_save_woocommerce_fields', [ $this->settings_pages, 'save_woocommerce_fields_settings' ] );
        add_action( 'admin_post_ai_search_refresh_quota', [ $this->settings_pages, 'refresh_quota_data' ] );
        add_action( 'admin_post_ai_search_complete_setup', [ $this->setup_wizard, 'complete_setup' ] );
        add_action( 'admin_post_ai_search_reconnect_service', [ $this, 'reconnect_service' ] );

        // AJAX actions
        add_action( 'wp_ajax_ai_search_validate_token', [ $this->settings_pages, 'validate_service_token' ] );
        add_action( 'wp_ajax_ai_search_get_taxonomies', [ $this, 'ajax_get_taxonomies' ] );
        add_action( 'wp_ajax_ai_search_get_terms', [ $this, 'ajax_get_terms' ] );
        add_action( 'wp_ajax_ai_search_dismiss_woo_welcome', [ $this, 'ajax_dismiss_woo_welcome' ] );
        add_action( 'wp_ajax_ai_search_wizard_generate_batch', [ $this->setup_wizard, 'ajax_generate_batch' ] );
    }

    /**
     * AJAX handler to get taxonomies for a post type.
     */
    public function ajax_get_taxonomies() {
        check_ajax_referer( 'ai_search_ajax' );

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

        $post_type = isset( $_POST['post_type'] ) ? sanitize_text_field( $_POST['post_type'] ) : 'post';
        $taxonomies = get_object_taxonomies( $post_type, 'objects' );

        $result = [];
        foreach ( $taxonomies as $taxonomy ) {
            if ( $taxonomy->public && $taxonomy->show_ui ) {
                $result[ $taxonomy->name ] = [
                    'label' => $taxonomy->label,
                    'name'  => $taxonomy->name,
                ];
            }
        }

        wp_send_json_success( $result );
    }

    /**
     * AJAX handler to get terms for a taxonomy.
     */
    public function ajax_get_terms() {
        check_ajax_referer( 'ai_search_ajax' );

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

        $taxonomy = isset( $_POST['taxonomy'] ) ? sanitize_text_field( $_POST['taxonomy'] ) : '';

        if ( empty( $taxonomy ) || ! taxonomy_exists( $taxonomy ) ) {
            wp_send_json_error( 'Invalid taxonomy' );
        }

        $terms = get_terms( [
            'taxonomy'   => $taxonomy,
            'hide_empty' => false,
            'number'     => 100,
        ] );

        if ( is_wp_error( $terms ) ) {
            wp_send_json_error( $terms->get_error_message() );
        }

        $result = [];
        foreach ( $terms as $term ) {
            $result[] = [
                'id'    => $term->term_id,
                'name'  => $term->name,
                'slug'  => $term->slug,
                'count' => $term->count,
            ];
        }

        wp_send_json_success( $result );
    }
    
    /**
     * Enqueue admin CSS and JS
     */
    public function enqueue_admin_assets( $hook ) {
        // Only load on our settings page (now it's a top-level menu)
        if ( 'toplevel_page_ai-search' !== $hook ) {
            return;
        }

        // Enqueue WordPress pointer for compatibility with other plugins
        wp_enqueue_script( 'wp-pointer' );
        wp_enqueue_style( 'wp-pointer' );

        wp_enqueue_style(
            'ai-search-admin-settings',
            plugins_url( 'css/admin-settings.css', __FILE__ ),
            [],
            AI_SEARCH_VERSION
        );
    }

    /**
     * Register settings menu in admin
     */
    public function register_settings_menu() {
        // Main menu page
        add_menu_page(
            'AI Search',                                    // Page title
            'AI Search',                                    // Menu title
            'manage_options',                               // Capability
            'ai-search',                                    // Menu slug
            [ $this->settings_pages, 'display_settings_page' ], // Callback
            AI_SEARCH_URL . 'assets/icon.svg',             // Icon
            58                                              // Position (before Settings)
        );

        // Submenu pages
        add_submenu_page(
            'ai-search',                                    // Parent slug
            'General Settings',                             // Page title
            'General Settings',                             // Menu title
            'manage_options',                               // Capability
            'ai-search',                                    // Menu slug (same as parent for first item)
            [ $this->settings_pages, 'display_settings_page' ] // Callback
        );

        add_submenu_page(
            'ai-search',
            'Setup Wizard',
            'Setup Wizard',
            'manage_options',
            'ai-search&setup=wizard',
            [ $this->settings_pages, 'display_settings_page' ]
        );

        add_submenu_page(
            'ai-search',
            'Support Forum',
            'Support Forum',
            'manage_options',
            'https://wordpress.org/support/plugin/ai-search/',
            ''
        );

        add_submenu_page(
            'ai-search',
            'Contact the Author',
            'Contact the Author',
            'manage_options',
            'https://samuelsilva.pt/lets-talk',
            ''
        );
    }
    
    /**
     * Get settings pages instance
     */
    public function get_settings_pages() {
        return $this->settings_pages;
    }
    
    /**
     * Get setup wizard instance
     */
    public function get_setup_wizard() {
        return $this->setup_wizard;
    }

    /**
     * Add custom CSS for menu icon sizing
     */
    public function add_menu_icon_styles() {
        ?>
        <style>
            #adminmenu #toplevel_page_ai-search img {
                width: 18px;
                height: 18px;
            }
        </style>
        <?php
    }

    /**
     * Fix parent file highlight for AI Search pages
     *
     * @param string $parent_file The parent file.
     * @return string
     */
    public function fix_admin_parent_file( $parent_file ) {
        global $pagenow;

        // Ensure AI Search menu is highlighted when on our pages
        if ( $pagenow === 'admin.php' && isset( $_GET['page'] ) && strpos( $_GET['page'], 'ai-search' ) === 0 ) {
            return 'ai-search';
        }

        return $parent_file;
    }

    /**
     * Fix submenu file highlight for AI Search pages
     *
     * @param string $submenu_file The submenu file.
     * @return string
     */
    public function fix_admin_submenu_file( $submenu_file ) {
        global $pagenow;

        if ( $pagenow === 'admin.php' && isset( $_GET['page'] ) && $_GET['page'] === 'ai-search' ) {
            // If we're on the wizard, highlight the wizard submenu
            if ( isset( $_GET['setup'] ) && $_GET['setup'] === 'wizard' ) {
                return 'ai-search&setup=wizard';
            }
            // Otherwise highlight the main settings
            return 'ai-search';
        }

        return $submenu_file;
    }

    /**
     * Show admin notice when domain doesn't match registered origin.
     */
    public function show_domain_mismatch_notice() {
        // Only show to admins
        if ( ! current_user_can( 'manage_options' ) ) {
            return;
        }

        // Only check if using AI Search Service (not OpenAI)
        $provider = get_option( 'ai_search_provider', 'ai_service' );
        if ( $provider !== 'ai_service' ) {
            return;
        }

        // Check if token exists
        $service_token = get_option( 'ai_search_service_token' );
        if ( empty( $service_token ) ) {
            return;
        }

        // Check if reconnection was successful
        if ( isset( $_GET['ai_search_reconnected'] ) && $_GET['ai_search_reconnected'] === 'success' ) {
            ?>
            <div class="notice notice-success is-dismissible">
                <p>
                    <strong><?php esc_html_e( 'AI Search', 'ai-search' ); ?>:</strong>
                    <?php esc_html_e( 'Successfully reconnected to AI Search Service with the new domain.', 'ai-search' ); ?>
                </p>
            </div>
            <?php
            return;
        }

        if ( isset( $_GET['ai_search_reconnected'] ) && $_GET['ai_search_reconnected'] === 'error' ) {
            ?>
            <div class="notice notice-error is-dismissible">
                <p>
                    <strong><?php esc_html_e( 'AI Search', 'ai-search' ); ?>:</strong>
                    <?php esc_html_e( 'Failed to reconnect to AI Search Service. Please try again or contact support.', 'ai-search' ); ?>
                </p>
            </div>
            <?php
            return;
        }

        $service = new AI_Search_Service();
        if ( $service->check_origin_match() ) {
            return;
        }

        $registered_origin = $service->get_registered_origin();
        $current_origin = get_site_url();
        $reconnect_url = wp_nonce_url(
            admin_url( 'admin-post.php?action=ai_search_reconnect_service' ),
            'ai_search_reconnect_service'
        );
        ?>
        <div class="notice notice-warning">
            <p>
                <strong><?php esc_html_e( 'AI Search - Domain Mismatch Detected', 'ai-search' ); ?></strong>
            </p>
            <p>
                <?php
                printf(
                    /* translators: 1: registered domain, 2: current domain */
                    esc_html__( 'Your AI Search Service token was registered for %1$s but your site is now running on %2$s. This may cause the search to fail.', 'ai-search' ),
                    '<code>' . esc_html( $registered_origin ) . '</code>',
                    '<code>' . esc_html( $current_origin ) . '</code>'
                );
                ?>
            </p>
            <p>
                <a href="<?php echo esc_url( $reconnect_url ); ?>" class="button button-primary">
                    <?php esc_html_e( 'Reconnect with Current Domain', 'ai-search' ); ?>
                </a>
                <span class="description" style="margin-left: 10px;">
                    <?php esc_html_e( 'This will register a new token for the current domain.', 'ai-search' ); ?>
                </span>
            </p>
        </div>
        <?php
    }

    /**
     * Handle service reconnection.
     */
    public function reconnect_service() {
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        check_admin_referer( 'ai_search_reconnect_service' );

        // Clear old token and origin
        delete_option( 'ai_search_service_token' );
        delete_option( 'ai_search_registered_origin' );

        // Register new token
        $service = new AI_Search_Service();
        $new_token = $service->register_origin();

        if ( $new_token ) {
            wp_redirect( admin_url( 'admin.php?page=ai-search&ai_search_reconnected=success' ) );
        } else {
            wp_redirect( admin_url( 'admin.php?page=ai-search&ai_search_reconnected=error' ) );
        }
        exit;
    }

    /**
     * Show a one-time welcome notice when WooCommerce is active.
     */
    public function show_woocommerce_welcome_notice() {
        if ( ! current_user_can( 'manage_options' ) ) {
            return;
        }

        if ( ! class_exists( 'WooCommerce' ) ) {
            return;
        }

        if ( ! get_option( 'ai_search_setup_completed', false ) ) {
            return;
        }

        if ( get_option( 'ai_search_woo_welcome_dismissed', false ) ) {
            return;
        }

        $settings_url = admin_url( 'admin.php?page=ai-search&tab=woocommerce' );
        $nonce        = wp_create_nonce( 'ai_search_dismiss_woo_welcome' );
        ?>
        <div class="notice notice-info is-dismissible ai-search-woo-welcome-notice" data-nonce="<?php echo esc_attr( $nonce ); ?>">
            <p>
                <strong><?php esc_html_e( 'AI Search', 'ai-search' ); ?>:</strong>
                <?php esc_html_e( 'WooCommerce detected. The plugin has been pre-configured with product-friendly defaults — short descriptions, categories, and attributes are already included in your store\'s search index.', 'ai-search' ); ?>
            </p>
            <p>
                <a href="<?php echo esc_url( $settings_url ); ?>" class="button button-primary">
                    <?php esc_html_e( 'Review product search settings', 'ai-search' ); ?>
                </a>
            </p>
        </div>
        <script>
        (function($){
            $(document).on('click', '.ai-search-woo-welcome-notice .notice-dismiss', function(){
                var nonce = $('.ai-search-woo-welcome-notice').data('nonce');
                $.post(ajaxurl, {
                    action: 'ai_search_dismiss_woo_welcome',
                    nonce: nonce
                });
            });
        })(jQuery);
        </script>
        <?php
    }

    /**
     * AJAX handler to permanently dismiss the WooCommerce welcome notice.
     */
    public function ajax_dismiss_woo_welcome() {
        check_ajax_referer( 'ai_search_dismiss_woo_welcome', 'nonce' );

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

        update_option( 'ai_search_woo_welcome_dismissed', true );
        wp_send_json_success();
    }
}