class BBP_Views_Widget extends WP_Widget {

	/**
	 * bbPress View Widget
	 *
	 * Registers the view widget
	 *
	 * @since 2.0.0 bbPress (r3020)
	 */
	public function __construct() {
		$widget_ops = apply_filters( 'bbp_views_widget_options', array(
			'classname'                   => 'widget_display_views',
			'description'                 => esc_html__( 'A list of registered optional topic views.', 'bbpress' ),
			'customize_selective_refresh' => true
		) );

		parent::__construct( false, esc_html__( '(bbPress) Topic Views List', 'bbpress' ), $widget_ops );
	}

	/**
	 * Register the widget
	 *
	 * @since 2.0.0 bbPress (r3389)
	 */
	public static function register_widget() {
		register_widget( 'BBP_Views_Widget' );
	}

	/**
	 * Displays the output, the view list
	 *
	 * @since 2.0.0 bbPress (r3020)
	 *
	 * @param array $args Arguments
	 * @param array $instance Instance
	 */
	public function widget( $args = array(), $instance = array() ) {

		// Only output widget contents if views exist
		if ( ! bbp_get_views() ) {
			return;
		}

		// Get widget settings
		$settings = $this->parse_settings( $instance );

		// Typical WordPress filter
		$settings['title'] = apply_filters( 'widget_title',          $settings['title'], $instance, $this->id_base );

		// bbPress filter
		$settings['title'] = apply_filters( 'bbp_view_widget_title', $settings['title'], $instance, $this->id_base );

		// Start an output buffer
		ob_start();

		echo $args['before_widget'];

		if ( ! empty( $settings['title'] ) ) {
			echo $args['before_title'] . $settings['title'] . $args['after_title'];
		} ?>

		<ul class="bbp-views-widget">

			<?php foreach ( array_keys( bbp_get_views() ) as $view ) : ?>

				<li><a class="bbp-view-title" href="<?php bbp_view_url( $view ); ?>"><?php bbp_view_title( $view ); ?></a></li>

			<?php endforeach; ?>

		</ul>

		<?php echo $args['after_widget'];

		// Output the current buffer
		echo ob_get_clean();
	}

	/**
	 * Update the view widget options
	 *
	 * @since 2.0.0 bbPress (r3020)
	 *
	 * @param array $new_instance The new instance options
	 * @param array $old_instance The old instance options
	 */
	public function update( $new_instance = array(), $old_instance = array() ) {
		$instance          = $old_instance;
		$instance['title'] = strip_tags( $new_instance['title'] );

		return $instance;
	}

	/**
	 * Output the view widget options form
	 *
	 * @since 2.0.0 bbPress (r3020)
	 *
	 * @param $instance Instance
	 */
	public function form( $instance = array() ) {

		// Get widget settings
		$settings = $this->parse_settings( $instance ); ?>

		<p>
			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php esc_html_e( 'Title:', 'bbpress' ); ?>
				<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $settings['title'] ); ?>" />
			</label>
		</p>

		<?php
	}

	/**
	 * Merge the widget settings into defaults array.
	 *
	 * @since 2.3.0 bbPress (r4802)
	 *
	 * @param $instance Instance
	 */
	public function parse_settings( $instance = array() ) {
		return bbp_parse_args( $instance, array(
			'title' => ''
		), 'view_widget_settings' );
	}
}