bbp_toggle_topic_handler( string $action = '' )

function bbp_toggle_topic_handler( $action = '' ) {

	// Bail if required GET actions aren't passed
	if ( empty( $_GET['topic_id'] ) )
		return;

	// Setup possible get actions
	$possible_actions = array(
		'bbp_toggle_topic_close',
		'bbp_toggle_topic_stick',
		'bbp_toggle_topic_spam',
		'bbp_toggle_topic_trash'
	);

	// Bail if actions aren't meant for this function
	if ( !in_array( $action, $possible_actions ) )
		return;

	$failure   = '';                         // Empty failure string
	$view_all  = false;                      // Assume not viewing all
	$topic_id  = (int) $_GET['topic_id'];    // What's the topic id?
	$success   = false;                      // Flag
	$post_data = array( 'ID' => $topic_id ); // Prelim array
	$redirect  = '';                         // Empty redirect URL

	// Make sure topic exists
	$topic = bbp_get_topic( $topic_id );
	if ( empty( $topic ) )
		return;

	// What is the user doing here?
	if ( !current_user_can( 'edit_topic', $topic->ID ) || ( 'bbp_toggle_topic_trash' === $action && !current_user_can( 'delete_topic', $topic->ID ) ) ) {
		bbp_add_error( 'bbp_toggle_topic_permission', __( '<strong>ERROR:</strong> You do not have the permission to do that.', 'buddyboss' ) );
		return;
	}

	// What action are we trying to perform?
	switch ( $action ) {

		// Toggle open/close
		case 'bbp_toggle_topic_close' :
			check_ajax_referer( 'close-topic_' . $topic_id );

			$is_open = bbp_is_topic_open( $topic_id );
			$success = true === $is_open ? bbp_close_topic( $topic_id ) : bbp_open_topic( $topic_id );
			$failure = true === $is_open ? __( '<strong>ERROR</strong>: There was a problem closing the discussion.', 'buddyboss' ) : __( '<strong>ERROR</strong>: There was a problem opening the discussion.', 'buddyboss' );

			break;

		// Toggle sticky/super-sticky/unstick
		case 'bbp_toggle_topic_stick' :
			check_ajax_referer( 'stick-topic_' . $topic_id );

			$is_sticky = bbp_is_topic_sticky( $topic_id );
			$is_super  = false === $is_sticky && !empty( $_GET['super'] ) && ( "1" === $_GET['super'] ) ? true : false;
			$success   = true  === $is_sticky ? bbp_unstick_topic( $topic_id ) : bbp_stick_topic( $topic_id, $is_super );
			$failure   = true  === $is_sticky ? __( '<strong>ERROR</strong>: There was a problem unsticking the discussion.', 'buddyboss' ) : __( '<strong>ERROR</strong>: There was a problem sticking the discussion.', 'buddyboss' );

			break;

		// Toggle spam
		case 'bbp_toggle_topic_spam' :
			check_ajax_referer( 'spam-topic_' . $topic_id );

			$is_spam  = bbp_is_topic_spam( $topic_id );
			$success  = true === $is_spam ? bbp_unspam_topic( $topic_id ) : bbp_spam_topic( $topic_id );
			$failure  = true === $is_spam ? __( '<strong>ERROR</strong>: There was a problem unmarking the discussion as spam.', 'buddyboss' ) : __( '<strong>ERROR</strong>: There was a problem marking the discussion as spam.', 'buddyboss' );
			$view_all = !$is_spam;

			break;

		// Toggle trash
		case 'bbp_toggle_topic_trash' :

			$sub_action = !empty( $_GET['sub_action'] ) && in_array( $_GET['sub_action'], array( 'trash', 'untrash', 'delete' ) ) ? $_GET['sub_action'] : false;

			if ( empty( $sub_action ) )
				break;

			switch ( $sub_action ) {
				case 'trash':
					check_ajax_referer( 'trash-' . bbp_get_topic_post_type() . '_' . $topic_id );

					$view_all = true;
					$success  = wp_trash_post( $topic_id );
					$failure  = __( '<strong>ERROR</strong>: There was a problem trashing the discussion.', 'buddyboss' );

					break;

				case 'untrash':
					check_ajax_referer( 'untrash-' . bbp_get_topic_post_type() . '_' . $topic_id );

					$success = wp_untrash_post( $topic_id );
					$failure = __( '<strong>ERROR</strong>: There was a problem untrashing the discussion.', 'buddyboss' );

					break;

				case 'delete':
					check_ajax_referer( 'delete-' . bbp_get_topic_post_type() . '_' . $topic_id );

					$success = wp_delete_post( $topic_id );
					$failure = __( '<strong>ERROR</strong>: There was a problem deleting the discussion.', 'buddyboss' );

					break;
			}

			break;
	}

	// Do additional topic toggle actions
	do_action( 'bbp_toggle_topic_handler', $success, $post_data, $action );

	// No errors
	if ( false !== $success && !is_wp_error( $success ) ) {

		// Redirect back to the topic's forum
		if ( isset( $sub_action ) && ( 'delete' === $sub_action ) ) {
			$redirect = bbp_get_forum_permalink( $success->post_parent );

		// Redirect back to the topic
		} else {

			// Get the redirect detination
			$permalink = bbp_get_topic_permalink( $topic_id );
			$redirect  = bbp_add_view_all( $permalink, $view_all );
		}

		wp_safe_redirect( $redirect );

		// For good measure
		exit();

	// Handle errors
	} else {
		bbp_add_error( 'bbp_toggle_topic', $failure );
	}
}