<?php
/**
 * @todo add description
 *
 * @package BuddyBoss\Search
 * @since BuddyBoss 1.0.0
 */

// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

if ( ! class_exists( 'Bp_Search_bbPress_Forums' ) ) :

	/**
	 * BuddyPress Global Search  - search bbpress forums class
	 */
	class Bp_Search_bbPress_Forums extends Bp_Search_bbPress {
		public $type = 'forum';

		function sql( $search_term, $only_totalrow_count = false ) {
			global $wpdb;

			$bp_prefix = bp_core_get_table_prefix();

			$query_placeholder = array();

			if ( $only_totalrow_count ) {
				$columns = ' COUNT( DISTINCT p.id ) ';
			} else {
				$columns             = " DISTINCT p.id , '{$this->type}' as type, p.post_title LIKE %s AS relevance, p.post_date as entry_date  ";
				$query_placeholder[] = '%' . $search_term . '%';
			}

			$from = "{$wpdb->posts} p LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID AND pm.meta_key = '_bbp_group_ids'";

			/**
			 * Filter the MySQL JOIN clause for the forum Search query.
			 *
             * @since BuddyBoss 1.5.6
			 *
			 * @param string $join_sql JOIN clause.
			 */
			$from = apply_filters( 'bp_forums_search_join_sql', $from );

			$where   = array();
			$where[] = '1=1';

			$search_term_array  = bb_search_get_search_keywords_by_term( $search_term, $this->type );
			$every_word_clauses = array();
			foreach ( $search_term_array as $term ) {
				$every_word_clauses[] = "(post_title LIKE %s OR post_content LIKE %s OR ExtractValue(post_content, '//text()') LIKE %s)";
				$query_placeholder[]  = '%' . $term . '%';
				$query_placeholder[]  = '%' . $term . '%';
				$query_placeholder[]  = '%' . $term . '%';
			}
			$where[] = implode( ' AND ', $every_word_clauses );

			$where[] = "post_type = '{$this->type}'";

			if ( current_user_can( 'read_hidden_forums' ) ) {
				$post_status = array( 'publish', 'private', 'hidden' );
			} elseif ( current_user_can( 'read_private_forums' ) ) {
				$post_status = array( 'publish', 'private' );
			} else {
				$post_status = array( 'publish' );
			}

			// Build complex WHERE clause for forum visibility.
			if ( bp_is_active( 'groups' ) && ! current_user_can( 'administrator' ) ) {
				// Get user accessible groups using shared method from parent class.
				$groups_data        = $this->get_user_accessible_groups();
				$user_group_ids     = $groups_data['user_group_ids'];
				$excluded_group_ids = $groups_data['excluded_group_ids'];

				// Build WHERE clause.
				$where_parts = array();

				// Condition 1: Forums not associated with any group (standalone forums).
				$where_parts[] = "(pm.meta_value IS NULL OR pm.meta_value = '' OR pm.meta_value = 'a:0:{}') AND post_status IN ('" . join( "','", $post_status ) . "')";

				// Condition 2: Forums associated with allowed groups.
				if ( ! empty( $user_group_ids ) ) {
					$serialized_values = array();
					$user_group_ids    = array_map( 'intval', $user_group_ids );
					foreach ( $user_group_ids as $group_id ) {
						$serialized_values[] = $wpdb->prepare( '%s', maybe_serialize( array( $group_id ) ) );
					}
					$where_parts[] = 'pm.meta_value IN (' . implode( ',', $serialized_values ) . ')';
				}

				// Combine conditions with OR (forum must match one of the conditions).
				$where_sql = '((' . implode( ') OR (', $where_parts ) . '))';

				// Explicitly exclude forums from restricted groups if user is not a member.
				if ( ! empty( $excluded_group_ids ) ) {
					$excluded_values = array();
					foreach ( $excluded_group_ids as $group_id ) {
						$excluded_values[] = $wpdb->prepare( '%s', maybe_serialize( array( $group_id ) ) );
					}
					// Add exclusion condition.
					$where_sql .= ' AND (pm.meta_value IS NULL OR pm.meta_value NOT IN (' . implode( ',', $excluded_values ) . '))';
				}

				if ( ! empty( $excluded_group_ids ) ) {
					$excluded_forum_args = array(
						'fields'      => 'ids',
						'post_status' => array( 'publish', 'private', 'hidden' ),
						'post_type'   => bbp_get_forum_post_type(),
						'numberposts' => -1,
						'meta_query'  => array(
							'relation' => 'OR',
						),
					);

					// Add meta queries for each excluded group.
					foreach ( $excluded_group_ids as $group_id ) {
						$excluded_forum_args['meta_query'][] = array(
							'key'     => '_bbp_group_ids',
							'value'   => maybe_serialize( array( $group_id ) ),
							'compare' => '=',
						);
					}

					$excluded_forum_ids     = get_posts( $excluded_forum_args );
					$excluded_forum_ids_str = '';

					// Build the forum restriction clause.
					if ( ! empty( $excluded_forum_ids ) ) {
						// Exclude replies from restricted forums.
						$excluded_forum_ids = array_map( 'intval', $excluded_forum_ids );

						$excluded_child_forum_ids = array();

						// Get child forum ids where parent forum are restricted.
						if ( method_exists( $this, 'nested_child_forum_ids' ) ) {
							foreach ( $excluded_forum_ids as $forum_id ) {
								$single_forum_child_ids   = $this->nested_child_forum_ids( $forum_id );
								$excluded_child_forum_ids = array_merge( $excluded_child_forum_ids, $single_forum_child_ids );
							}
						}
						$excluded_forum_ids_str = implode( ',', array_unique( array_merge( $excluded_forum_ids, $excluded_child_forum_ids ) ) );

						$where_sql .= ' AND p.id NOT IN ( ' . $excluded_forum_ids_str . ' )';
					}
				}
			} else {
				// Groups not active, just check post status.
				$where_sql = "post_status IN ('" . join( "','", $post_status ) . "')";
			}

			$where[] = $where_sql;

			/**
			 * Filters the MySQL WHERE conditions for the forum Search query.
			 *
             * @since BuddyBoss 1.5.6
			 *
			 * @param array  $where_conditions Current conditions for MySQL WHERE statement.
			 */
			$where = apply_filters( 'bp_forums_search_where_sql', $where );

			$sql   = 'SELECT ' . $columns . ' FROM ' . $from . ' WHERE ' . implode( ' AND ', $where );
			$query = $wpdb->prepare( $sql, $query_placeholder ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared

			return apply_filters(
				'Bp_Search_Forums_sql',
				$query,
				array(
					'search_term'         => $search_term,
					'only_totalrow_count' => $only_totalrow_count,
				)
			);
		}

		/**
		 * Insures that only one instance of Class exists in memory at any
		 * one time. Also prevents needing to define globals all over the place.
		 *
		 * @since BuddyBoss 1.0.0
		 *
		 * @return object Bp_Search_Forums
		 */
		public static function instance() {
			// Store the instance locally to avoid private static replication.
			static $instance = null;

			// Only run these methods if they haven't been run previously.
			if ( null === $instance ) {
				$instance = new Bp_Search_bbPress_Forums();
			}

			// Always return the instance.
			return $instance;
		}

		/**
		 * A dummy constructor to prevent this class from being loaded more than once.
		 *
		 * @since BuddyBoss 1.0.0
		 */
		private function __construct() {
			/* Do nothing here */
		}

	}

	// End class Bp_Search_bbPress_Forums.

endif;