<?php
/**
 * Import widgets from a json file
 * Use plugin Widget Importer & Exporter to export
 *
 * @link https://wordpress.org/plugins/widget-importer-exporter/
 */

/**
 * Class to import widgets from exported file
 * The exported file must be in json format
 *
 * @version 1.0.0
 */
class Glozin_Demo_Widgets_Importer {
	/**
	 * Main function to import widgets
	 *
	 * @param  object $data The widgets object
	 * @return array        Imported widgets
	 */
	public function import( $data ) {
		global $wp_registered_sidebars;

		// Have valid data?
		// If no data or could not decode
		if ( empty( $data ) || ! is_object( $data ) ) {
			wp_die(
				__( 'Import data could not be read. Please try a different file.', 'claudio' ),
				'',
				array( 'back_link' => true )
			);
		}

		// Get all available widgets site supports
		$available_widgets = $this->available_widgets();

		// Get all existing widget instances
		$widget_instances = array();
		foreach ( $available_widgets as $widget_data ) {
			$widget_instances[$widget_data['id_base']] = get_option( 'widget_' . $widget_data['id_base'] );
		}

		// Begin results
		$results = array();

		// Loop import data's sidebars
		foreach ( $data as $sidebar_id => $widgets ) {

			// Skip inactive widgets
			// (should not be in export file)
			if ( 'wp_inactive_widgets' == $sidebar_id ) {
				continue;
			}

			// Check if sidebar is available on this site
			// Otherwise add widgets to inactive, and say so
			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'; // add to inactive if sidebar does not exist in theme
				$sidebar_message_type = 'error';
				$sidebar_message = __( 'Sidebar does not exist in theme (using Inactive)', 'claudio' );
			}

			// Result for sidebar
			$results[$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();

			// Loop widgets
			foreach ( $widgets as $widget_instance_id => $widget ) {

				$fail = false;

				// Get id_base (remove -# from end) and instance ID number
				$id_base = preg_replace( '/-[0-9]+$/', '', $widget_instance_id );
				$instance_id_number = str_replace( $id_base . '-', '', $widget_instance_id );

				// Does site support this widget?
				if ( ! $fail && ! isset( $available_widgets[$id_base] ) ) {
					$fail = true;
					$widget_message_type = 'error';
					$widget_message = __( 'Site does not support widget', 'claudio' ); // explain why widget not imported
				}

				// Convert multidimensional objects to multidimensional arrays
				// Some plugins like Jetpack Widget Visibility store settings as multidimensional arrays
				// Without this, they are imported as objects and cause fatal error on Widgets page
				// If this creates problems for plugins that do actually intend settings in objects then may need to consider other approach: https://wordpress.org/support/topic/problem-with-array-of-arrays
				// It is probably much more likely that arrays are used than objects, however
				$widget = json_decode( json_encode( $widget ), true );

				// Does widget with identical settings already exist in same sidebar?
				if ( ! $fail && isset( $widget_instances[$id_base] ) ) {

					// Get existing widgets in this sidebar
					$sidebars_widgets = get_option( 'sidebars_widgets' );
					$sidebar_widgets = isset( $sidebars_widgets[$use_sidebar_id] ) ? $sidebars_widgets[$use_sidebar_id] : array(); // check Inactive if that's where will go

					// Loop widgets with ID base
					$single_widget_instances = ! empty( $widget_instances[$id_base] ) ? $widget_instances[$id_base] : array();
					foreach ( $single_widget_instances as $check_id => $check_widget ) {

						// Is widget in same sidebar and has identical settings?
						if ( in_array( "$id_base-$check_id", $sidebar_widgets ) && (array) $widget == $check_widget ) {

							$fail = true;
							$widget_message_type = 'warning';
							$widget_message = __( 'Widget already exists', 'claudio' ); // explain why widget not imported

							break;

						}

					}

				}

				// No failure
				if ( ! $fail ) {

					// Add widget instance
					$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 ); // start fresh if have to
					$single_widget_instances[] = $widget; // add it

						// Get the key it was given
						end( $single_widget_instances );
						$new_instance_id_number = key( $single_widget_instances );

						// If key is 0, make it 1
						// When 0, an issue can occur where adding a widget causes data from other widget to load, and the widget doesn't stick (reload wipes it)
						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] );
						}

						// Move _multiwidget to end of array for uniformity
						if ( isset( $single_widget_instances['_multiwidget'] ) ) {
							$multiwidget = $single_widget_instances['_multiwidget'];
							unset( $single_widget_instances['_multiwidget'] );
							$single_widget_instances['_multiwidget'] = $multiwidget;
						}

						// Update option with new widget
						update_option( 'widget_' . $id_base, $single_widget_instances );

					// Assign widget instance to sidebar
					$sidebars_widgets = get_option( 'sidebars_widgets' ); // which sidebars have which widgets, get fresh every time
					$new_instance_id = $id_base . '-' . $new_instance_id_number; // use ID number from new widget instance
					$sidebars_widgets[$use_sidebar_id][] = $new_instance_id; // add new instance to sidebar
					update_option( 'sidebars_widgets', $sidebars_widgets ); // save the amended data

					// Success message
					if ( $sidebar_available ) {
						$widget_message_type = 'success';
						$widget_message = __( 'Imported', 'claudio' );
					} else {
						$widget_message_type = 'warning';
						$widget_message = __( 'Imported to Inactive', 'claudio' );
					}

				}

				// Result for widget instance
				$results[$sidebar_id]['widgets'][$widget_instance_id]['name'] = isset( $available_widgets[$id_base]['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'] : __( 'No Title', 'claudio' ); // 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;

			}

		}

		// Return results
		return $results;
	}

	/**
	 * Get all available widgets
	 *
	 * Gather site's widgets into array with ID base, name, etc.
	 * Used by export and import functions.
	 *
	 * @global array $wp_registered_widget_updates
	 *
	 * @return array Widget information
	 */
	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']] ) ) { // no dupes
				$available_widgets[$widget['id_base']]['id_base'] = $widget['id_base'];
				$available_widgets[$widget['id_base']]['name']    = $widget['name'];
			}
		}

		return $available_widgets;
	}
}
