<?php
/**
 * Core Plugin — Singleton orchestrator.
 * Boots all subsystems after Elementor is confirmed active.
 *
 * @package AdMoreWidgetsSuite
 * @since   1.0.0
 */

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

final class EPPRO_Plugin {

    /** @var EPPRO_Plugin|null */
    private static $instance = null;

    /**
     * Returns the single instance, creating it on first call.
     */
    public static function instance(): self {
        if ( is_null( self::$instance ) ) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /** Prevent external instantiation. */
    private function __construct() {
        $this->load_dependencies();
        $this->init_components();
        // Migrations touch posts and options: run them once WordPress is fully loaded,
        // not while plugins are still being included (when this constructor runs).
        add_action( 'init', [ $this, 'settings_version_check' ], 20 );
    }

    /** Prevent cloning. */
    public function __clone() {}

    /** Prevent unserialization. */
    public function __wakeup() {}

    // -------------------------------------------------------------------------
    // Dependency Loading
    // -------------------------------------------------------------------------

    private function load_dependencies(): void {
        // Database manager (must load before any class that queries DB)
        require_once EPPRO_PATH . 'core/DB.php';

        // Core managers
        require_once EPPRO_PATH . 'core/Asset_Manager.php';
        require_once EPPRO_PATH . 'core/widgets-manager.php';

        // Shared Elementor helpers (widget lookup, safe template rendering)
        require_once EPPRO_PATH . 'includes/class-elementor-helper.php';

        // Admin & back-end services
        require_once EPPRO_PATH . 'includes/class-admin-settings.php';
        require_once EPPRO_PATH . 'includes/class-form-handler.php';
        require_once EPPRO_PATH . 'includes/class-form-entries.php';
        require_once EPPRO_PATH . 'includes/class-customizer.php';

        // Setup wizard
        require_once EPPRO_PATH . 'includes/class-setup-wizard.php';

        // Advanced search AJAX handler
        require_once EPPRO_PATH . 'includes/class-advanced-search-handler.php';

        // Template duplicator
        require_once EPPRO_PATH . 'includes/class-template-duplicator.php';

        // Advanced features (v1.4.0+)
        // Note: Display conditions are handled by EPPRO_Extension_Conditions (core/extensions/Conditions.php).
        // The standalone class-display-conditions.php is no longer loaded to avoid dead code.
        require_once EPPRO_PATH . 'includes/class-effects-manager.php';

        // Popup builder system
        require_once EPPRO_PATH . 'includes/popup/class-popup-cpt.php';
        require_once EPPRO_PATH . 'includes/popup/class-popup-settings.php';
        require_once EPPRO_PATH . 'includes/popup/class-popup-design.php';
        require_once EPPRO_PATH . 'includes/popup/class-popup-admin.php';
        require_once EPPRO_PATH . 'includes/popup/class-popup-renderer.php';

        // Theme Builder (Header/Footer) system
        require_once EPPRO_PATH . 'includes/theme-builder/class-theme-builder-cpt.php';
        require_once EPPRO_PATH . 'includes/theme-builder/class-theme-builder-conditions.php';
        require_once EPPRO_PATH . 'includes/theme-builder/class-theme-builder-admin.php';
        require_once EPPRO_PATH . 'includes/theme-builder/class-theme-builder-renderer.php';
        
        // Template shortcode
        require_once EPPRO_PATH . 'includes/class-template-shortcode.php';
        
        // Post Grid AJAX handler
        require_once EPPRO_PATH . 'includes/class-post-grid-ajax.php';

        // WooCommerce Products AJAX (Load More, Quick View)
        require_once EPPRO_PATH . 'includes/class-woo-products-ajax.php';

        // Read settings to decide which extensions to load
        $eppro_s    = get_option( 'eppro_settings', [] );
        $disabled = (array) ( $eppro_s['disabled_extensions'] ?? [] );

        // Dynamic Tags
        if ( ! in_array( 'dynamic_tags', $disabled, true ) ) {
            require_once EPPRO_PATH . 'core/dynamic-tags/Tag_Manager.php';
        }

        // Extensions (per-element controls)
        if ( ! in_array( 'sticky', $disabled, true ) ) {
            require_once EPPRO_PATH . 'core/extensions/Sticky.php';
        }
        if ( ! in_array( 'custom_css', $disabled, true ) ) {
            require_once EPPRO_PATH . 'core/extensions/Custom_CSS.php';
        }
        if ( ! in_array( 'conditions', $disabled, true ) ) {
            require_once EPPRO_PATH . 'core/extensions/Conditions.php';
        }
    }

    // -------------------------------------------------------------------------
    // Component Initialisation
    // -------------------------------------------------------------------------

    private function init_components(): void {
        // ── Elementor hooks FIRST ─────────────────────────────────────────────
        // These must be registered before anything else so that a failure in
        // any later init() cannot prevent widgets from appearing in the editor.
        add_action( 'elementor/elements/categories_registered', [ 'EPPRO_Widgets_Manager', 'register_category' ] );
        add_action( 'elementor/widgets/register',               [ 'EPPRO_Widgets_Manager', 'register_widgets'  ] );

        // ── DB ────────────────────────────────────────────────────────────────
        try { EPPRO_DB::maybe_upgrade(); } catch ( \Throwable $e ) { eppro_log( 'EPP DB upgrade error: ' . $e->getMessage() ); }

        // ── Core admin & asset services ───────────────────────────────────────
        try {
            EPPRO_Admin_Settings::init();
            EPPRO_Form_Handler::init();
            EPPRO_Form_Entries::init();
            EPPRO_Asset_Manager::init();
            EPPRO_Customizer::init();
        } catch ( \Throwable $e ) { eppro_log( 'EPP core admin init error: ' . $e->getMessage() ); }

        // ── Optional extensions ───────────────────────────────────────────────
        try {
            if ( class_exists( 'EPPRO_Tag_Manager' ) )          { EPPRO_Tag_Manager::init(); }
            if ( class_exists( 'EPPRO_Extension_Sticky' ) )      { EPPRO_Extension_Sticky::init(); }
            if ( class_exists( 'EPPRO_Extension_Conditions' ) )  { EPPRO_Extension_Conditions::init(); }
            if ( class_exists( 'EPPRO_Extension_Custom_CSS' ) )  { EPPRO_Extension_Custom_CSS::init(); }
        } catch ( \Throwable $e ) { eppro_log( 'EPP extensions init error: ' . $e->getMessage() ); }

        // ── Setup wizard + utilities ──────────────────────────────────────────
        try {
            EPPRO_Setup_Wizard::init();
            EPPRO_Advanced_Search_Handler::init();
            EPPRO_Template_Duplicator::init();
            // Display Conditions handled by EPPRO_Extension_Conditions (core/extensions).
            EPPRO_Effects_Manager::init();
        } catch ( \Throwable $e ) { eppro_log( 'EPP utilities init error: ' . $e->getMessage() ); }

        // ── Popup system ──────────────────────────────────────────────────────
        try {
            EPPRO_Popup_CPT::init();
            EPPRO_Popup_Settings::init();
            EPPRO_Popup_Design::init();
            EPPRO_Popup_Admin::init();
            EPPRO_Popup_Renderer::init();
        } catch ( \Throwable $e ) { eppro_log( 'EPP popup init error: ' . $e->getMessage() ); }

        // ── Theme Builder system ──────────────────────────────────────────────
        try {
            EPPRO_Theme_Builder_CPT::init();
            EPPRO_Theme_Builder_Admin::init();
            EPPRO_Theme_Builder_Renderer::init();
            EPPRO_Template_Shortcode::init();
        } catch ( \Throwable $e ) { eppro_log( 'EPP theme builder init error: ' . $e->getMessage() ); }

        // ── Post Grid / WooCommerce Products AJAX ─────────────────────────────
        try { EPPRO_Post_Grid_AJAX::init(); } catch ( \Throwable $e ) { eppro_log( 'EPP post grid init error: ' . $e->getMessage() ); }
        try { EPPRO_Woo_Products_AJAX::init(); } catch ( \Throwable $e ) { eppro_log( 'EPP woo products init error: ' . $e->getMessage() ); }

        // ── WooCommerce: keep Mini Cart badge count in sync on AJAX add-to-cart ─
        // Registered here (not in the widget file) so it fires on
        // wc-ajax=get_refreshed_fragments requests where Elementor widgets are
        // never registered. It is added unconditionally: this code runs while
        // Elementor loads, before WooCommerce, so class_exists( 'WooCommerce' )
        // would still be false here. The filter only fires when WooCommerce runs.
        add_filter( 'woocommerce_add_to_cart_fragments', [ __CLASS__, 'mini_cart_fragment' ] );
    }

    /** Refreshed item count and subtotal for the Mini Cart widget. */
    public static function mini_cart_fragment( $fragments ) {
        if ( ! is_array( $fragments ) || ! function_exists( 'WC' ) || ! WC()->cart ) return $fragments;
        $count = WC()->cart->get_cart_contents_count();
        $fragments['.eppro-wmc-count']    = '<span class="eppro-wmc-count">' . esc_html( $count ) . '</span>';
        $fragments['.eppro-wmc-subtotal'] = '<span class="eppro-wmc-subtotal">' . wp_kses_post( WC()->cart->get_cart_subtotal() ) . '</span>';
        return $fragments;
    }

    // -------------------------------------------------------------------------
    // Settings Versioning — runs a migration when EPPRO_VERSION changes.
    // -------------------------------------------------------------------------

    public function settings_version_check(): void {
        $stored = get_option( 'eppro_settings_version', '0.0.0' );

        if ( version_compare( $stored, EPPRO_VERSION, '<' ) ) {
            $this->migrate_old_prefix();
            update_option( 'eppro_settings_version', EPPRO_VERSION );

            // Widget style controls can change between versions (new CSS selectors).
            // Let Elementor rebuild every page's CSS file once, lazily, so existing
            // pages pick the new rules up without a manual "Regenerate CSS".
            if ( class_exists( '\Elementor\Plugin' ) && isset( \Elementor\Plugin::$instance->files_manager ) ) {
                \Elementor\Plugin::$instance->files_manager->clear_cache();
            }
        }
    }

    private function migrate_old_prefix(): void {
        if ( get_option( 'eppro_prefix_migrated' ) ) return;

        global $wpdb;

        $option_map = [
            'epp_settings'                    => 'eppro_settings',
            'epp_settings_version'            => 'eppro_settings_version',
            'epp_setup_complete'              => 'eppro_setup_complete',
            'epp_db_version'                  => 'eppro_db_version',
            'epp_customizer_settings'         => 'eppro_customizer_settings',
            'epp_popup_cpt_flushed'           => 'eppro_popup_cpt_flushed',
            'epp_popup_cpt_flushed_v2'        => 'eppro_popup_cpt_flushed_v2',
            'epp_hf_cpt_flushed'              => 'eppro_hf_cpt_flushed',
            'epp_feedback_notice_dismissed'   => 'eppro_feedback_notice_dismissed',
            'epp_show_feedback_notice'        => 'eppro_show_feedback_notice',
            'epp_deactivation_feedback_log'   => 'eppro_deactivation_feedback_log',
        ];
        foreach ( $option_map as $old => $new ) {
            $val = get_option( $old );
            if ( false !== $val && false === get_option( $new ) ) {
                update_option( $new, $val );
                delete_option( $old );
            }
        }

        $old_popups = get_posts( [
            'post_type'      => 'epp_popup',
            'post_status'    => 'any',
            'posts_per_page' => -1,
            'fields'         => 'ids',
            'no_found_rows'  => true,
        ] );
        foreach ( $old_popups as $post_id ) {
            wp_update_post( [ 'ID' => $post_id, 'post_type' => 'eppro_popup' ] );
        }

        $old_templates = get_posts( [
            'post_type'      => 'epp_hf_template',
            'post_status'    => 'any',
            'posts_per_page' => -1,
            'fields'         => 'ids',
            'no_found_rows'  => true,
        ] );
        foreach ( $old_templates as $post_id ) {
            wp_update_post( [ 'ID' => $post_id, 'post_type' => 'eppro_hf_template' ] );
        }

        $old_table = $wpdb->prefix . 'epp_form_entries';
        $new_table = $wpdb->prefix . 'eppro_form_entries';
        // One-time migration of the plugin's own table (old "epp_" prefix → "eppro_").
        // phpcs:disable WordPress.DB.DirectDatabaseQuery
        $table_exists = wp_cache_get( 'eppro_old_table_check' );
        if ( false === $table_exists ) {
            $table_exists = $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $old_table ) ) === $old_table;
            wp_cache_set( 'eppro_old_table_check', $table_exists );
        }
        if ( $table_exists ) {
            $wpdb->query( $wpdb->prepare( 'RENAME TABLE %i TO %i', $old_table, $new_table ) );
            // phpcs:enable WordPress.DB.DirectDatabaseQuery
            wp_cache_delete( 'eppro_old_table_check' );
        }

        // No rewrite flush needed: the plugin's post types register no rewrite rules.
        update_option( 'eppro_prefix_migrated', '1' );
    }
}