<?php
/**
 * Widgets Importer.
 *
 * @since 2.0.0
 */

namespace KraftPlugins\DemoImporterPlus;

use WP_Error;

class WidgetsImporter {

	/**
	 * Cleanup function.
	 *
	 * @return array
	 */
	public function cleanup(): array {
//		update_option( 'sidebars_widgets', array() );

		return array();
	}

	/**
	 * Available widgets
	 */
	public function available_widgets() {

		global $wp_registered_widget_controls;

		$widget_controls   = $wp_registered_widget_controls;
		$available_widgets = array();

		foreach ( $widget_controls as $widget ) {
			if ( ! empty( $widget[ 'id_base' ] ) && ! isset( $available_widgets[ $widget[ 'id_base' ] ] ) ) {
				$available_widgets[ $widget[ 'id_base' ] ][ 'id_base' ] = $widget[ 'id_base' ];
				$available_widgets[ $widget[ 'id_base' ] ][ 'name' ]    = $widget[ 'name' ];
			}
		}

		return apply_filters( 'wie_available_widgets', $available_widgets );
	}


	/**
	 * Import Widgets.
	 *
	 * @param array $widgets
	 *
	 * @return WP_Error|array
	 */
	public function import( array $widgets ) {

		global $wp_registered_sidebars;

		$data = $widgets;

		unset( $widgets );

		do_action( 'wie_before_import' );

		$data = apply_filters( 'wie_import_data', $data );

		$available_widgets = $this->available_widgets();

		$widget_instances = array();
		foreach ( $available_widgets as $widget_data ) {
			$widget_instances[ $widget_data[ 'id_base' ] ] = get_option( 'widget_' . $widget_data[ 'id_base' ] );
		}

		$results = array();

		foreach ( $data as $sidebar_id => $widgets ) {
			if ( 'wp_inactive_widgets' === $sidebar_id ) {
				continue;
			}
			if ( isset( $wp_registered_sidebars[ $sidebar_id ] ) ) {
				$sidebar_available    = true;
				$use_sidebar_id       = $sidebar_id;
				$sidebar_message_type = 'success';
				$sidebar_message      = '';
			} else {
				$sidebar_available    = false;
				$use_sidebar_id       = 'wp_inactive_widgets';
				$sidebar_message_type = 'error';
				$sidebar_message      = esc_html__( 'Widget area does not exist in theme (using Inactive)', 'demo-importer-plus' );
			}

			$results[ $sidebar_id ][ 'name' ]         = ! empty( $wp_registered_sidebars[ $sidebar_id ][ 'name' ] ) ? $wp_registered_sidebars[ $sidebar_id ][ 'name' ] : $sidebar_id; // sidebar name if theme supports it; otherwise ID.
			$results[ $sidebar_id ][ 'message_type' ] = $sidebar_message_type;
			$results[ $sidebar_id ][ 'message' ]      = $sidebar_message;
			$results[ $sidebar_id ][ 'widgets' ]      = array();

			$terms_mappings = get_option( '_demo_importer_terms_mapping', array() );

			$nav_menu_terms = isset( $terms_mappings[ 'nav_menu' ] ) ? (array) $terms_mappings[ 'nav_menu' ] : array();

			foreach ( $widgets as $widget_instance_id => $widget ) {
				$fail               = false;
				$id_base            = preg_replace( '/-[0-9]+$/', '', $widget_instance_id );
				$instance_id_number = str_replace( $id_base . '-', '', $widget_instance_id );

				if ( ! isset( $available_widgets[ $id_base ] ) ) {
					$fail                = true;
					$widget_message_type = 'error';
					$widget_message      = esc_html__( 'Site does not support widget', 'demo-importer-plus' ); // explain why widget not imported.
				}

				$widget = apply_filters( 'wie_widget_settings', $widget );

				$widget = json_decode( wp_json_encode( $widget ), true );

				$widget = apply_filters( 'wie_widget_settings_array', $widget );

				if ( ! $fail && isset( $widget_instances[ $id_base ] ) ) {
					$sidebars_widgets = get_option( 'sidebars_widgets' );
					$sidebar_widgets  = $sidebars_widgets[ $use_sidebar_id ] ?? array(); // check Inactive if that's where will go.

					$single_widget_instances = ! empty( $widget_instances[ $id_base ] ) ? $widget_instances[ $id_base ] : array();
					foreach ( $single_widget_instances as $check_id => $check_widget ) {

						if ( in_array( "$id_base-$check_id", $sidebar_widgets, true ) && (array) $widget === $check_widget ) {

							$fail                = true;
							$widget_message_type = 'warning';
							$widget_message      = esc_html__( 'Widget already exists', 'demo-importer-plus' ); // explain why widget not imported.
							break;
						}
					}
				}

				if ( ! $fail ) {

					$single_widget_instances   = get_option( 'widget_' . $id_base ); // all instances for that widget ID base, get fresh every time.
					$single_widget_instances   = ! empty( $single_widget_instances ) ? $single_widget_instances : array(
						'_multiwidget' => 1,
					);
					$single_widget_instances[] = $widget;

					end( $single_widget_instances );
					$new_instance_id_number = key( $single_widget_instances );

					if ( '0' === strval( $new_instance_id_number ) ) {
						$new_instance_id_number                             = 1;
						$single_widget_instances[ $new_instance_id_number ] = $single_widget_instances[ 0 ];
						unset( $single_widget_instances[ 0 ] );
					}

					if ( isset( $single_widget_instances[ '_multiwidget' ] ) ) {
						$multiwidget = $single_widget_instances[ '_multiwidget' ];
						unset( $single_widget_instances[ '_multiwidget' ] );
						$single_widget_instances[ '_multiwidget' ] = $multiwidget;
					}

					if ( is_array( $single_widget_instances ) ) {
						foreach ( $single_widget_instances as &$widget_instance ) {
							if ( isset( $widget_instance[ 'nav_menu' ] ) && isset( $nav_menu_terms[ $widget_instance[ 'nav_menu' ] ] ) ) {
								$widget_instance[ 'nav_menu' ] = $nav_menu_terms[ $widget_instance[ 'nav_menu' ] ];
							}
						}
					}

					update_option( 'widget_' . $id_base, $single_widget_instances );

					$sidebars_widgets = get_option( 'sidebars_widgets' ); // which sidebars have which widgets, get fresh every time.

					if ( ! $sidebars_widgets ) {
						$sidebars_widgets = array();
					}

					$new_instance_id                       = $id_base . '-' . $new_instance_id_number;
					$sidebars_widgets[ $use_sidebar_id ][] = $new_instance_id;
					update_option( 'sidebars_widgets', $sidebars_widgets );

					$after_widget_import = array(
						'sidebar'           => $use_sidebar_id,
						'sidebar_old'       => $sidebar_id,
						'widget'            => $widget,
						'widget_type'       => $id_base,
						'widget_id'         => $new_instance_id,
						'widget_id_old'     => $widget_instance_id,
						'widget_id_num'     => $new_instance_id_number,
						'widget_id_num_old' => $instance_id_number,
					);
					do_action( 'wie_after_widget_import', $after_widget_import );

					if ( $sidebar_available ) {
						$widget_message_type = 'success';
						$widget_message      = esc_html__( 'Imported', 'demo-importer-plus' );
					} else {
						$widget_message_type = 'warning';
						$widget_message      = esc_html__( 'Imported to Inactive', 'demo-importer-plus' );
					}
				}

				$results[ $sidebar_id ][ 'widgets' ][ $widget_instance_id ][ 'name' ]         = $available_widgets[ $id_base ][ 'name' ] ?? $id_base; // widget name or ID if name not available (not supported by site).
				$results[ $sidebar_id ][ 'widgets' ][ $widget_instance_id ][ 'title' ]        = ! empty( $widget[ 'title' ] ) ? $widget[ 'title' ] : esc_html__( 'No Title', 'demo-importer-plus' ); // show "No Title" if widget instance is untitled.
				$results[ $sidebar_id ][ 'widgets' ][ $widget_instance_id ][ 'message_type' ] = $widget_message_type;
				$results[ $sidebar_id ][ 'widgets' ][ $widget_instance_id ][ 'message' ]      = $widget_message;

			}
		}

		do_action( 'wie_after_import' );

		return apply_filters( 'wie_import_results', $results );
	}
}