hidden_forums' ) ) {
		return;
	}

	// Define local variables
	$forum_id = 0;
	$wp_query = bbp_get_wp_query();

	// Check post type
	switch ( $wp_query->get( 'post_type' ) ) {

		// Forum
		case bbp_get_forum_post_type() :
			$forum_id = bbp_get_forum_id( $wp_query->post->ID );
			break;

		// Topic
		case bbp_get_topic_post_type() :
			$forum_id = bbp_get_topic_forum_id( $wp_query->post->ID );
			break;

		// Reply
		case bbp_get_reply_post_type() :
			$forum_id = bbp_get_reply_forum_id( $wp_query->post->ID );
			break;
	}

	// If forum is explicitly hidden and user not capable, set 404
	if ( ! empty( $forum_id ) && bbp_is_forum_hidden( $forum_id ) && ! current_user_can( 'read_forum', $forum_id ) ) {
		bbp_set_404( $wp_query );
	}
}

/**
 * Check if it's a private forum or a topic or reply of a private forum and if
 * the user can't view it, then sets a 404
 *
 * @since 2.0.0 bbPress (r2996)
 */
function bbp_forum_enforce_private() {

	// Bail if not viewing a single item or if user has caps
	if ( ! is_singular() || bbp_is_user_keymaster() || current_user_can( 'read_private_forums' ) ) {
		return;
	}

	// Define local variables
	$forum_id = 0;
	$wp_query = bbp_get_wp_query();

	// Check post type
	switch ( $wp_query->get( 'post_type' ) ) {

		// Forum
		case bbp_get_forum_post_type() :
			$forum_id = bbp_get_forum_id( $wp_query->post->ID );
			break;

		// Topic
		case bbp_get_topic_post_type() :
			$forum_id = bbp_get_topic_forum_id( $wp_query->post->ID );
			break;

		// Reply
		case bbp_get_reply_post_type() :
			$forum_id = bbp_get_reply_forum_id( $wp_query->post->ID );
			break;

	}

	// If forum is explicitly hidden and user not capable, set 404
	if ( ! empty( $forum_id ) && bbp_is_forum_private( $forum_id ) && ! current_user_can( 'read_forum', $forum_id ) ) {
		bbp_set_404( $wp_query );
	}
}

/** Permissions ***************************************************************/

/**
 * Redirect if unauthorized user is attempting to edit a forum
 *
 * @since 2.1.0 bbPress (r3607)
 */
function bbp_check_forum_edit() {

	// Bail if not editing a topic
	if ( ! bbp_is_forum_edit() ) {
		return;
	}

	// User cannot edit topic, so redirect back to reply
	if ( ! current_user_can( 'edit_forum', bbp_get_forum_id() ) ) {
		bbp_redirect( bbp_get_forum_permalink() );
	}
}

/**
 * Delete all topics (and their replies) for a specific forum ID
 *
 * @since 2.1.0 bbPress (r3668)
 *
 * @param int $forum_id
 * @return If forum is not valid
 */
function bbp_delete_forum_topics( $forum_id = 0 ) {

	// Validate forum ID
	$forum_id = bbp_get_forum_id( $forum_id );
	if ( empty( $forum_id ) ) {
		return;
	}

	// Forum is being permanently deleted, so its content has go too
	// Note that we get all post statuses here
	$topics = new WP_Query( array(
		'fields'         => 'id=>parent',
		'post_type'      => bbp_get_topic_post_type(),
		'post_parent'    => $forum_id,
		'post_status'    => array_keys( get_post_stati() ),
		'posts_per_page' => -1,

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

	// Loop through and delete child topics. Topic replies will get deleted by
	// the bbp_delete_topic() action.
	if ( ! empty( $topics->posts ) ) {
		foreach ( $topics->posts as $topic ) {
			wp_delete_post( $topic->ID, true );
		}

		// Reset the $post global
		wp_reset_postdata();
	}

	// Cleanup
	unset( $topics );
}

/**
 * Trash all topics inside a forum
 *
 * @since 2.1.0 bbPress (r3668)
 *
 * @param int $forum_id
 * @return If forum is not valid
 */
function bbp_trash_forum_topics( $forum_id = 0 ) {

	// Validate forum ID
	$forum_id = bbp_get_forum_id( $forum_id );
	if ( empty( $forum_id ) ) {
		return;
	}

	// Allowed post statuses to pre-trash
	$post_stati = array(
		bbp_get_public_status_id(),
		bbp_get_closed_status_id(),
		bbp_get_pending_status_id()
	);

	// Forum is being trashed, so its topics (and replies) are trashed too
	$topics = new WP_Query( array(
		'fields'         => 'id=>parent',
		'post_type'      => bbp_get_topic_post_type(),
		'post_parent'    => $forum_id,
		'post_status'    => $post_stati,
		'posts_per_page' => -1,

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

	// Loop through and trash child topics. Topic replies will get trashed by
	// the bbp_trash_topic() action.
	if ( ! empty( $topics->posts ) ) {

		// Prevent debug notices
		$pre_trashed_topics = array();

		// Loop through topics, trash them, and add them to array
		foreach ( $topics->posts as $topic ) {
			wp_trash_post( $topic->ID, true );
			$pre_trashed_topics[] = $topic->ID;
		}

		// Set a post_meta entry of the topics that were trashed by this action.
		// This is so we can possibly untrash them, without untrashing topics
		// that were purposefully trashed before.
		update_post_meta( $forum_id, '_bbp_pre_trashed_topics', $pre_trashed_topics );

		// Reset the $post global
		wp_reset_postdata();
	}

	// Cleanup
	unset( $topics );
}

/**
 * Untrash all topics inside a forum
 *
 * @since 2.1.0 bbPress (r3668)
 *
 * @param int $forum_id
 * @return If forum is not valid
 */
function bbp_untrash_forum_topics( $forum_id = 0 ) {

	// Validate forum ID
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) ) {
		return;
	}

	// Get the topics that were not previously trashed
	$pre_trashed_topics = get_post_meta( $forum_id, '_bbp_pre_trashed_topics', true );

	// There are topics to untrash
	if ( ! empty( $pre_trashed_topics ) ) {

		// Maybe reverse the trashed topics array
		if ( is_array( $pre_trashed_topics ) ) {
			$pre_trashed_topics = array_reverse( $pre_trashed_topics );
		}

		// Loop through topics
		foreach ( (array) $pre_trashed_topics as $topic ) {
			wp_untrash_post( $topic );
		}
	}
}

/** Before Delete/Trash/Untrash ***********************************************/

/**
 * Called before deleting a forum.
 *
 * This function is supplemental to the actual forum deletion which is
 * handled by WordPress core API functions. It is used to clean up after
 * a forum that is being deleted.
 *
 * @since 2.1.0 bbPress (r3668)
 */
function bbp_delete_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_delete_forum', $forum_id );
}

/**
 * Called before trashing a forum
 *
 * This function is supplemental to the actual forum being trashed which is
 * handled by WordPress core API functions. It is used to clean up after
 * a forum that is being trashed.
 *
 * @since 2.1.0 bbPress (r3668)
 */
function bbp_trash_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_trash_forum', $forum_id );
}

/**
 * Called before untrashing a forum
 *
 * @since 2.1.0 bbPress (r3668)
 */
function bbp_untrash_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_untrash_forum', $forum_id );
}

/** After Delete/Trash/Untrash ************************************************/

/**
 * Called after deleting a forum
 *
 * Try not to use this action. All meta & taxonomy terms have already been
 * deleted, making them impossible to use.
 *
 * @since 2.1.0 bbPress (r3668)
 * @since 2.6.0 bbPress (r6526) Not recommend for usage
 */
function bbp_deleted_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_deleted_forum', $forum_id );
}

/**
 * Called after trashing a forum
 *
 * @since 2.1.0 bbPress (r3668)
 */
function bbp_trashed_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_trashed_forum', $forum_id );
}

/**
 * Called after untrashing a forum
 *
 * @since 2.1.0 bbPress (r3668)
 */
function bbp_untrashed_forum( $forum_id = 0 ) {
	$forum_id = bbp_get_forum_id( $forum_id );

	if ( empty( $forum_id ) || ! bbp_is_forum( $forum_id ) ) {
		return false;
	}

	do_action( 'bbp_untrashed_forum', $forum_id );
}