<?php

/**

 * Widget API: WP_Widget base class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core base class extended to register widgets.

 *

 * This class must be extended for each widget, and WP_Widget::widget() must be overridden.

 *

 * If adding widget options, WP_Widget::update() and WP_Widget::form() should also be overridden.

 *

 * @since 2.8.0

 * @since 4.4.0 Moved to its own file from wp-includes/widgets.php

 */

class WP_Widget {

	/**

	 * Root ID for all widgets of this type.

	 *

	 * @since 2.8.0

	 * @var mixed|string

	 */

	public $id_base;

	/**

	 * Name for this widget type.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $name;

	/**

	 * Option name for this widget type.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $option_name;

	/**

	 * Alt option name for this widget type.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $alt_option_name;

	/**

	 * Option array passed to wp_register_sidebar_widget().

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $widget_options;

	/**

	 * Option array passed to wp_register_widget_control().

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $control_options;

	/**

	 * Unique ID number of the current instance.

	 *

	 * @since 2.8.0

	 * @var bool|int

	 */

	public $number = false;

	/**

	 * Unique ID string of the current instance (id_base-number).

	 *

	 * @since 2.8.0

	 * @var bool|string

	 */

	public $id = false;

	/**

	 * Whether the widget data has been updated.

	 *

	 * Set to true when the data is updated after a POST submit - ensures it does

	 * not happen twice.

	 *

	 * @since 2.8.0

	 * @var bool

	 */

	public $updated = false;

	//

	// Member functions that must be overridden by subclasses.

	//

	/**

	 * Echoes the widget content.

	 *

	 * Subclasses should override this function to generate their widget code.

	 *

	 * @since 2.8.0

	 *

	 * @param array $args     Display arguments including 'before_title', 'after_title',

	 *                        'before_widget', and 'after_widget'.

	 * @param array $instance The settings for the particular instance of the widget.

	 */

	public function widget( $args, $instance ) {

		die( 'function WP_Widget::widget() must be overridden in a subclass.' );

	}

	/**

	 * Updates a particular instance of a widget.

	 *

	 * This function should check that `$new_instance` is set correctly. The newly-calculated

	 * value of `$instance` should be returned. If false is returned, the instance won't be

	 * saved/updated.

	 *

	 * @since 2.8.0

	 *

	 * @param array $new_instance New settings for this instance as input by the user via

	 *                            WP_Widget::form().

	 * @param array $old_instance Old settings for this instance.

	 * @return array Settings to save or bool false to cancel saving.

	 */

	public function update( $new_instance, $old_instance ) {

		return $new_instance;

	}

	/**

	 * Outputs the settings update form.

	 *

	 * @since 2.8.0

	 *

	 * @param array $instance Current settings.

	 * @return string Default return is 'noform'.

	 */

	public function form( $instance ) {

		echo '<p class="no-options-widget">' . __( 'There are no options for this widget.' ) . '</p>';

		return 'noform';

	}

	// Functions you'll need to call.

	/**

	 * PHP5 constructor.

	 *

	 * @since 2.8.0

	 *

	 * @param string $id_base         Optional. Base ID for the widget, lowercase and unique. If left empty,

	 *                                a portion of the widget's PHP class name will be used. Has to be unique.

	 * @param string $name            Name for the widget displayed on the configuration page.

	 * @param array  $widget_options  Optional. Widget options. See wp_register_sidebar_widget() for

	 *                                information on accepted arguments. Default empty array.

	 * @param array  $control_options Optional. Widget control options. See wp_register_widget_control() for

	 *                                information on accepted arguments. Default empty array.

	 */

	public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {

		if ( ! empty( $id_base ) ) {

			$id_base = strtolower( $id_base );

		} else {

			$id_base = preg_replace( '/(wp_)?widget_/', '', strtolower( get_class( $this ) ) );

		}

		$this->id_base         = $id_base;

		$this->name            = $name;

		$this->option_name     = 'widget_' . $this->id_base;

		$this->widget_options  = wp_parse_args(

			$widget_options,

			array(

				'classname'                   => str_replace( '\\', '_', $this->option_name ),

				'customize_selective_refresh' => false,

			)

		);

		$this->control_options = wp_parse_args( $control_options, array( 'id_base' => $this->id_base ) );

	}

	/**

	 * PHP4 constructor.

	 *

	 * @since 2.8.0

	 * @deprecated 4.3.0 Use __construct() instead.

	 *

	 * @see WP_Widget::__construct()

	 *

	 * @param string $id_base         Optional. Base ID for the widget, lowercase and unique. If left empty,

	 *                                a portion of the widget's PHP class name will be used. Has to be unique.

	 * @param string $name            Name for the widget displayed on the configuration page.

	 * @param array  $widget_options  Optional. Widget options. See wp_register_sidebar_widget() for

	 *                                information on accepted arguments. Default empty array.

	 * @param array  $control_options Optional. Widget control options. See wp_register_widget_control() for

	 *                                information on accepted arguments. Default empty array.

	 */

	public function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {

		_deprecated_constructor( 'WP_Widget', '4.3.0', get_class( $this ) );

		WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );

	}

	/**

	 * Constructs name attributes for use in form() fields

	 *

	 * This function should be used in form() methods to create name attributes for fields

	 * to be saved by update()

	 *

	 * @since 2.8.0

	 * @since 4.4.0 Array format field names are now accepted.

	 *

	 * @param string $field_name Field name.

	 * @return string Name attribute for `$field_name`.

	 */

	public function get_field_name( $field_name ) {

		$pos = strpos( $field_name, '[' );

		if ( false !== $pos ) {

			// Replace the first occurrence of '[' with ']['.

			$field_name = '[' . substr_replace( $field_name, '][', $pos, strlen( '[' ) );

		} else {

			$field_name = '[' . $field_name . ']';

		}

		return 'widget-' . $this->id_base . '[' . $this->number . ']' . $field_name;

	}

	/**

	 * Constructs id attributes for use in WP_Widget::form() fields.

	 *

	 * This function should be used in form() methods to create id attributes

	 * for fields to be saved by WP_Widget::update().

	 *

	 * @since 2.8.0

	 * @since 4.4.0 Array format field IDs are now accepted.

	 *

	 * @param string $field_name Field name.

	 * @return string ID attribute for `$field_name`.

	 */

	public function get_field_id( $field_name ) {

		$field_name = str_replace( array( '[]', '[', ']' ), array( '', '-', '' ), $field_name );

		$field_name = trim( $field_name, '-' );

		return 'widget-' . $this->id_base . '-' . $this->number . '-' . $field_name;

	}

	/**

	 * Register all widget instances of this widget class.

	 *

	 * @since 2.8.0

	 */

	public function _register() {

		$settings = $this->get_settings();

		$empty    = true;

		// When $settings is an array-like object, get an intrinsic array for use with array_keys().

		if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {

			$settings = $settings->getArrayCopy();

		}

		if ( is_array( $settings ) ) {

			foreach ( array_keys( $settings ) as $number ) {

				if ( is_numeric( $number ) ) {

					$this->_set( $number );

					$this->_register_one( $number );

					$empty = false;

				}

			}

		}

		if ( $empty ) {

			// If there are none, we register the widget's existence with a generic template.

			$this->_set( 1 );

			$this->_register_one();

		}

	}

	/**

	 * Sets the internal order number for the widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @param int $number The unique order number of this widget instance compared to other

	 *                    instances of the same class.

	 */

	public function _set( $number ) {

		$this->number = $number;

		$this->id     = $this->id_base . '-' . $number;

	}

	/**

	 * Retrieves the widget display callback.

	 *

	 * @since 2.8.0

	 *

	 * @return callable Display callback.

	 */

	public function _get_display_callback() {

		return array( $this, 'display_callback' );

	}

	/**

	 * Retrieves the widget update callback.

	 *

	 * @since 2.8.0

	 *

	 * @return callable Update callback.

	 */

	public function _get_update_callback() {

		return array( $this, 'update_callback' );

	}

	/**

	 * Retrieves the form callback.

	 *

	 * @since 2.8.0

	 *

	 * @return callable Form callback.

	 */

	public function _get_form_callback() {

		return array( $this, 'form_callback' );

	}

	/**

	 * Determines whether the current request is inside the Customizer preview.

	 *

	 * If true -- the current request is inside the Customizer preview, then

	 * the object cache gets suspended and widgets should check this to decide

	 * whether they should store anything persistently to the object cache,

	 * to transients, or anywhere else.

	 *

	 * @since 3.9.0

	 *

	 * @global WP_Customize_Manager $wp_customize

	 *

	 * @return bool True if within the Customizer preview, false if not.

	 */

	public function is_preview() {

		global $wp_customize;

		return ( isset( $wp_customize ) && $wp_customize->is_preview() );

	}

	/**

	 * Generates the actual widget content (Do NOT override).

	 *

	 * Finds the instance and calls WP_Widget::widget().

	 *

	 * @since 2.8.0

	 *

	 * @param array     $args        Display arguments. See WP_Widget::widget() for information

	 *                               on accepted arguments.

	 * @param int|array $widget_args {

	 *     Optional. Internal order number of the widget instance, or array of multi-widget arguments.

	 *     Default 1.

	 *

	 *     @type int $number Number increment used for multiples of the same widget.

	 * }

	 */

	public function display_callback( $args, $widget_args = 1 ) {

		if ( is_numeric( $widget_args ) ) {

			$widget_args = array( 'number' => $widget_args );

		}

		$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );

		$this->_set( $widget_args['number'] );

		$instances = $this->get_settings();

			$instance = $instances[ $this->number ];

			/**

			 * Filters the settings for a particular widget instance.

			 *

			 * Returning false will effectively short-circuit display of the widget.

			 *

			 * @since 2.8.0

			 *

			 * @param array     $instance The current widget instance's settings.

			 * @param WP_Widget $widget   The current widget instance.

			 * @param array     $args     An array of default widget arguments.

			 */

			$instance = apply_filters( 'widget_display_callback', $instance, $this, $args );

			if ( false === $instance ) {

				return;

			}

			$was_cache_addition_suspended = wp_suspend_cache_addition();

			if ( $this->is_preview() && ! $was_cache_addition_suspended ) {

				wp_suspend_cache_addition( true );

			}

			$this->widget( $args, $instance );

			if ( $this->is_preview() ) {

				wp_suspend_cache_addition( $was_cache_addition_suspended );

			}

		}

	}

	/**

	 * Handles changed settings (Do NOT override).

	 *

	 * @since 2.8.0

	 *

	 * @global array $wp_registered_widgets

	 *

	 * @param int $deprecated Not used.

	 */

	public function update_callback( $deprecated = 1 ) {

		global $wp_registered_widgets;

		$all_instances = $this->get_settings();

		// We need to update the data.

		if ( $this->updated ) {

			return;

		}

		if ( isset( $_POST['delete_widget'] ) && $_POST['delete_widget'] ) {

			// Delete the settings for this instance of the widget.

			if ( isset( $_POST['the-widget-id'] ) ) {

				$del_id = $_POST['the-widget-id'];

			} else {

				return;

			}

			if ( isset( $wp_registered_widgets[ $del_id ]['params'][0]['number'] ) ) {

				$number = $wp_registered_widgets[ $del_id ]['params'][0]['number'];

				if ( $this->id_base . '-' . $number == $del_id ) {

					unset( $all_instances[ $number ] );

				}

			}

		} else {

			if ( isset( $_POST[ 'widget-' . $this->id_base ] ) && is_array( $_POST[ 'widget-' . $this->id_base ] ) ) {

				$settings = $_POST[ 'widget-' . $this->id_base ];

			} elseif ( isset( $_POST['id_base'] ) && $_POST['id_base'] == $this->id_base ) {

				$num      = $_POST['multi_number'] ? (int) $_POST['multi_number'] : (int) $_POST['widget_number'];

				$settings = array( $num => array() );

			} else {