class BBP_Topics_Widget extends WP_Widget {

	/**
	 * bbPress Topic Widget
	 *
	 * Registers the topic widget
	 *
	 * @since 2.0.0 bbPress (r2653)
	 */
	public function __construct() {
		$widget_ops = apply_filters( 'bbp_topics_widget_options', array(
			'classname'                   => 'widget_display_topics',
			'description'                 => esc_html__( 'A list of recent topics, sorted by: newness, popularity, or recent replies.', 'bbpress' ),
			'customize_selective_refresh' => true
		) );

		parent::__construct( false, esc_html__( '(bbPress) Recent Topics', 'bbpress' ), $widget_ops );
	}

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

	/**
	 * Displays the output, the topic list
	 *
	 * @since 2.0.0 bbPress (r2653)
	 *
	 * @param array $args
	 * @param array $instance
	 */
	public function widget( $args = array(), $instance = array() ) {

		// 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_topic_widget_title', $settings['title'], $instance, $this->id_base );

		// How do we want to order our results?
		switch ( $settings['order_by'] ) {

			// Order by most recent replies
			case 'freshness' :
				$topics_query = array(

					// What and how
					'post_type'      => bbp_get_topic_post_type(),
					'post_status'    => bbp_get_public_topic_statuses(),
					'post_parent'    => $settings['parent_forum'],
					'posts_per_page' => (int) $settings['max_shown'],
					'meta_query'     => array( array(
						'key'  => '_bbp_last_active_time',
						'type' => 'DATETIME'
					) ),

					// Ordering
					'orderby' => 'meta_value',
					'order'   => 'DESC',

					// Performance
					'ignore_sticky_posts'    => true,
					'no_found_rows'          => true,
					'update_post_term_cache' => false,
					'update_post_meta_cache' => false
				);
				break;

			// Order by total number of replies
			case 'popular' :
				$topics_query = array(

					// What and how
					'post_type'      => bbp_get_topic_post_type(),
					'post_status'    => bbp_get_public_topic_statuses(),
					'post_parent'    => $settings['parent_forum'],
					'posts_per_page' => (int) $settings['max_shown'],
					'meta_query'     => array( array(
						'key'  => '_bbp_reply_count',
						'type' => 'NUMERIC'
					) ),

					// Ordering
					'orderby' => 'meta_value_num',
					'order'   => 'DESC',

					// Performance
					'ignore_sticky_posts'    => true,
					'no_found_rows'          => true,
					'update_post_term_cache' => false,
					'update_post_meta_cache' => false
				);
				break;

			// Order by which topic was created most recently
			case 'newness' :
			default :
				$topics_query = array(

					// What and how
					'post_type'      => bbp_get_topic_post_type(),
					'post_status'    => bbp_get_public_topic_statuses(),
					'post_parent'    => $settings['parent_forum'],
					'posts_per_page' => (int) $settings['max_shown'],

					// Ordering
					'orderby' => 'date',
					'order'   => 'DESC',

					// Performance
					'ignore_sticky_posts'    => true,
					'no_found_rows'          => true,
					'update_post_term_cache' => false,
					'update_post_meta_cache' => false
				);
				break;
		}

		// Note: private and hidden forums will be excluded via the
		// bbp_pre_get_posts_normalize_forum_visibility action and function.
		$widget_query = new WP_Query( $topics_query );

		// Bail if no topics are found
		if ( ! $widget_query->have_posts() ) {
			return;
		}

		// 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-topics-widget <?php echo esc_attr( $settings['order_by'] ); ?>">

			<?php while ( $widget_query->have_posts() ) :

				$widget_query->the_post();
				$topic_id    = bbp_get_topic_id( $widget_query->post->ID );
				$author_link = '';

				// Maybe get the topic author
				if ( ! empty( $settings['show_user'] ) ) :
					$author_link = bbp_get_topic_author_link( array( 'post_id' => $topic_id, 'type' => 'both', 'size' => 14 ) );
				endif; ?>

				<li>
					<a class="bbp-forum-title" href="<?php bbp_topic_permalink( $topic_id ); ?>"><?php bbp_topic_title( $topic_id ); ?></a>

					<?php if ( ! empty( $author_link ) ) : ?>

						<?php printf( esc_html_x( 'by %1$s', 'widgets', 'bbpress' ), '<span class="topic-author">' . $author_link . '</span>' ); ?>

					<?php endif; ?>

					<?php if ( ! empty( $settings['show_date'] ) ) : ?>

						<div><?php bbp_topic_last_active_time( $topic_id ); ?></div>

					<?php endif; ?>

				</li>

			<?php endwhile; ?>

		</ul>

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

		// Reset the $post global
		wp_reset_postdata();

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

	/**
	 * Update the topic widget options
	 *
	 * @since 2.0.0 bbPress (r2653)
	 *
	 * @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'] );
		$instance['order_by']     = strip_tags( $new_instance['order_by'] );
		$instance['parent_forum'] = sanitize_text_field( $new_instance['parent_forum'] );
		$instance['max_shown']    = (int) $new_instance['max_shown'];

		// Date
		$instance['show_date'] = isset( $new_instance['show_date'] )
			? (bool) $new_instance['show_date']
			: false;

		// Author
		$instance['show_user'] = isset( $new_instance['show_user'] )
			? (bool) $new_instance['show_user']
			: false;

		// Force to any
		if ( ! empty( $instance['parent_forum'] ) && ! is_numeric( $instance['parent_forum'] ) ) {
			$instance['parent_forum'] = 'any';
		}

		return $instance;
	}

	/**
	 * Output the topic widget options form
	 *
	 * @since 2.0.0 bbPress (r2653)
	 *
	 * @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>
		<p><label for="<?php echo $this->get_field_id( 'max_shown' ); ?>"><?php esc_html_e( 'Maximum topics to show:', 'bbpress' ); ?> <input class="widefat" id="<?php echo $this->get_field_id( 'max_shown' ); ?>" name="<?php echo $this->get_field_name( 'max_shown' ); ?>" type="text" value="<?php echo esc_attr( $settings['max_shown'] ); ?>" /></label></p>

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

			<br />

			<small><?php esc_html_e( '"0" to show only root - "any" to show all', 'bbpress' ); ?></small>
		</p>

		<p><label for="<?php echo $this->get_field_id( 'show_date' ); ?>"><?php esc_html_e( 'Show post date:',    'bbpress' ); ?> <input type="checkbox" id="<?php echo $this->get_field_id( 'show_date' ); ?>" name="<?php echo $this->get_field_name( 'show_date' ); ?>" <?php checked( true, $settings['show_date'] ); ?> value="1" /></label></p>
		<p><label for="<?php echo $this->get_field_id( 'show_user' ); ?>"><?php esc_html_e( 'Show topic author:', 'bbpress' ); ?> <input type="checkbox" id="<?php echo $this->get_field_id( 'show_user' ); ?>" name="<?php echo $this->get_field_name( 'show_user' ); ?>" <?php checked( true, $settings['show_user'] ); ?> value="1" /></label></p>

		<p>
			<label for="<?php echo $this->get_field_id( 'order_by' ); ?>"><?php esc_html_e( 'Order By:', 'bbpress' ); ?></label>
			<select name="<?php echo $this->get_field_name( 'order_by' ); ?>" id="<?php echo $this->get_field_id( 'order_by' ); ?>">
				<option <?php selected( $settings['order_by'], 'newness'   ); ?> value="newness"><?php esc_html_e( 'Newest Topics',                'bbpress' ); ?></option>
				<option <?php selected( $settings['order_by'], 'popular'   ); ?> value="popular"><?php esc_html_e( 'Popular Topics',               'bbpress' ); ?></option>
				<option <?php selected( $settings['order_by'], 'freshness' ); ?> value="freshness"><?php esc_html_e( 'Topics With Recent Replies', 'bbpress' ); ?></option>
			</select>
		</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'        => esc_html__( 'Recent Topics', 'bbpress' ),
			'max_shown'    => 5,
			'show_date'    => false,
			'show_user'    => false,
			'parent_forum' => 'any',
			'order_by'     => false
		), 'topic_widget_settings' );
	}
}