<?php
/**
 * @package Botmaster
 * @version 1.0.0
 * @author  Quantamcloud
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WpwBot_Search' ) ) :
	/**
	 * Class for plugin search
	 */
	class WpwBot_Search {

		/**
		 * @var AWS_Search Array of all plugin data $data
		 */
		private $data = array();

		/**
		 * Return a singleton instance of the current class
		 *
		 * @return object
		 */
		public static function factory() {
			static $instance = false;
			if ( ! $instance ) {
				$instance = new self();
			}
			return $instance;
		}

		/**
		 * Search
		 *
		 * @param  string $keyword
		 * @return array
		 */
		public function search( $keyword = '' ) {
			global $wpdb;
			$special_chars = $this->get_special_chars();
			if ( empty( $keyword ) ) {
				check_ajax_referer( 'wpwbot_search_nonce', 'nonce' );
				$s = isset( $_POST['keyword'] ) ? esc_attr( $_POST['keyword'] ) : '';
			} else {
				$s = esc_attr( $keyword );
			}
			$s             = stripslashes( $s );
			$s             = str_replace( array( "\r", "\n" ), '', $s );
			$s             = str_replace( $special_chars, '', $s );
			$show_cats     = 'true';
			$show_tags     = 'true';
			$search_in     = 'true';
			$outofstock    = 'true';
			$search_in_arr = explode( ',', 'title,content,category,excerpt,tag,sku' );
			// Search in title if all options is disabled.
			if ( ! $search_in ) {
				$search_in_arr = array( 'title' );
			}
			$categories_array           = array();
			$tags_array                 = array();
			$this->data['s']            = $s;
			$this->data['results_num']  = 50;// This static before setting option on wpwbot admin panel.
			$this->data['search_terms'] = array();
			$this->data['search_terms'] = array_unique( explode( ' ', $s ) );
			$this->data['search_in']    = $search_in_arr;
			$this->data['outofstock']   = $outofstock;
			$posts_ids                  = $this->query_index_table();
			$products_array             = $this->get_products( $posts_ids );
			return $products_array;
		}

		/**
		 * Get special characters that must be striped
		 *
		 * @return array
		 */
		public function get_special_chars() {
			$chars = array(
				'-',
				'_',
				'|',
				'+',
				'`',
				'~',
				'!',
				'@',
				'#',
				'$',
				'%',
				'^',
				'&',
				'*',
				'(',
				')',
				'\\',
				'?',
				';',
				':',
				"'",
				'"',
				'.',
				',',
				'<',
				'>',
				'{',
				'}',
				'/',
				'[',
				']',
			);
			return apply_filters( 'aws_special_chars', $chars );
		}

		/**
		 * Query in index table
		 *
		 * @return array
		 */
		private function query_index_table() {
			global $wpdb;
			$table_name          = $wpdb->prefix . QCLD_wpCHATBOT_INDEX_TABLE;
			$search_in_arr       = $this->data['search_in'];
			$results_num         = $this->data['results_num'];
			$outofstock          = $this->data['outofstock'];
			$reindex_version     = get_option( 'aws_reindex_version' );
			$query               = array();
			$query['search']     = '';
			$query['source']     = '';
			$query['relevance']  = '';
			$query['stock']      = '';
			$query['visibility'] = '';
			$query['lang']       = '';
			$search_array        = array();
			$source_array        = array();
			$relevance_array     = array();
			$new_relevance_array = array();
			foreach ( $this->data['search_terms'] as $search_term ) {
				$search_term_len        = strlen( $search_term );
				$relevance_title        = 200 + 20 * $search_term_len;
				$relevance_content      = 35 + 4 * $search_term_len;
				$relevance_title_like   = 40 + 2 * $search_term_len;
				$relevance_content_like = 35 + 1 * $search_term_len;
				$search_term_like       = preg_replace( '/(s|es|ies)$/i', '', $search_term );
				$like                   = '%' . $wpdb->esc_like( $search_term_like ) . '%';
				if ( $search_term_len > 1 ) {
					$search_array[] = $wpdb->prepare( '( term LIKE %s )', $like );
				} else {
					$search_array[] = $wpdb->prepare( '( term = %s )', $search_term );
				}
				foreach ( $search_in_arr as $search_in_term ) {
					switch ( $search_in_term ) {
						case 'title':
							$relevance_array['title'][] = $wpdb->prepare( "( case when ( term_source = 'title' AND term = %s ) then {$relevance_title} * count else 0 end )", $search_term );
							$relevance_array['title'][] = $wpdb->prepare( "( case when ( term_source = 'title' AND term LIKE %s ) then {$relevance_title_like} * count else 0 end )", $like );
							break;
						case 'content':
							$relevance_array['content'][] = $wpdb->prepare( "( case when ( term_source = 'content' AND term = %s ) then {$relevance_content} * count else 0 end )", $search_term );
							$relevance_array['content'][] = $wpdb->prepare( "( case when ( term_source = 'content' AND term LIKE %s ) then {$relevance_content_like} * count else 0 end )", $like );
							break;
						case 'excerpt':
							$relevance_array['content'][] = $wpdb->prepare( "( case when ( term_source = 'excerpt' AND term = %s ) then {$relevance_content} * count else 0 end )", $search_term );
							$relevance_array['content'][] = $wpdb->prepare( "( case when ( term_source = 'excerpt' AND term LIKE %s ) then {$relevance_content_like} * count else 0 end )", $like );
							break;
						case 'category':
							$relevance_array['category'][] = $wpdb->prepare( "( case when ( term_source = 'category' AND term = %s ) then 35 else 0 end )", $search_term );
							$relevance_array['category'][] = $wpdb->prepare( "( case when ( term_source = 'category' AND term LIKE %s ) then 5 else 0 end )", $like );
							break;
						case 'tag':
							$relevance_array['tag'][] = $wpdb->prepare( "( case when ( term_source = 'tag' AND term = %s ) then 35 else 0 end )", $search_term );
							$relevance_array['tag'][] = $wpdb->prepare( "( case when ( term_source = 'tag' AND term LIKE %s ) then 5 else 0 end )", $like );
							break;
						case 'sku':
							$relevance_array['sku'][] = $wpdb->prepare( "( case when ( term_source = 'sku' AND term = %s ) then 300 else 0 end )", $search_term );
							$relevance_array['sku'][] = $wpdb->prepare( "( case when ( term_source = 'sku' AND term LIKE %s ) then 50 else 0 end )", $like );
							break;
					}
				}
			}
			// Sort 'relevance' queries in the array by search priority.
			foreach ( $search_in_arr as $search_in_item ) {
				if ( isset( $relevance_array[ $search_in_item ] ) ) {
					$new_relevance_array[ $search_in_item ] = implode( ' + ', $relevance_array[ $search_in_item ] );
				}
			}
			foreach ( $search_in_arr as $search_in_term ) {
				$source_array[] = "term_source = '{$search_in_term}'";
			}
			$query['relevance'] .= sprintf( ' (SUM( %s )) ', implode( ' + ', $new_relevance_array ) );
			$query['search']    .= sprintf( ' AND ( %s )', implode( ' OR ', $search_array ) );
			$query['source']    .= sprintf( ' AND ( %s )', implode( ' OR ', $source_array ) );
			if ( $reindex_version && version_compare( $reindex_version, '1.16', '>=' ) ) {
				if ( $outofstock !== 'true' ) {
					$query['stock'] .= ' AND in_stock = 1';
				}
				$query['visibility'] .= " AND NOT visibility LIKE '%hidden%'";
			}
			if ( ( defined( 'ICL_SITEPRESS_VERSION' ) || function_exists( 'pll_current_language' ) ) && $reindex_version && version_compare( $reindex_version, '1.20', '>=' ) ) {
				$current_lang = false;
				if ( has_filter( 'wpml_current_language' ) ) {
					$current_lang = apply_filters( 'wpml_current_language', null );
				} elseif ( function_exists( 'pll_current_language' ) ) {
					$current_lang = pll_current_language();
				}
				if ( $current_lang ) {
					$query['lang'] .= $wpdb->prepare( " AND ( lang LIKE %s OR lang = '' )", $current_lang );
				}
			} elseif ( function_exists( 'qtranxf_getLanguage' ) ) {
				$current_lang = qtranxf_getLanguage();
				if ( $current_lang ) {
					$query['lang'] .= $wpdb->prepare( " AND ( lang LIKE %s OR lang = '' )", $current_lang );
				}
			}
			$sql       = "SELECT
                    distinct ID,
                    {$query['relevance']} as relevance
                FROM
                    {$table_name}
                WHERE
                    type = 'product'
                {$query['source']}
                {$query['search']}
                {$query['stock']}
                {$query['visibility']}
                {$query['lang']}
                GROUP BY ID
                ORDER BY
                    relevance DESC
				LIMIT 0, {$results_num}
		    ";
			$posts_ids = $this->get_posts_ids( $sql );
			return $posts_ids;
		}

		/**
		 * Get array of included to search result posts ids
		 *
		 * @param string $sql
		 * @return array
		 */
		private function get_posts_ids( $sql ) {
			global $wpdb;
			$posts_ids      = array();
			$search_results = $wpdb->get_results( $wpdb->prepare( $sql ) );
			if ( ! empty( $search_results ) && ! is_wp_error( $search_results ) && is_array( $search_results ) ) {
				foreach ( $search_results as $search_result ) {
					$post_id = intval( $search_result->ID );
					if ( ! in_array( $post_id, $posts_ids ) ) {
						$posts_ids[] = $post_id;
					}
				}
			}
			unset( $search_results );
			return $posts_ids;
		}

		/**
		 * Get load more products
		 *
		 * @param  $posts_ids
		 * @return array
		 */
		public function get_load_more_products( $posts_ids ) {
			return $this->get_products( $posts_ids );
		}

		/**
		 * Get products info
		 *
		 * @param array $posts_ids
		 * @return array
		 */
		private function get_products( $posts_ids ) {
			$product_per_page = get_option( 'qlcd_wp_chatbot_ppp' ) != '' ? get_option( 'qlcd_wp_chatbot_ppp' ) : 10;
			$products_array   = array();
			$more_product_ids = array();
			$products_num     = count( $posts_ids );
			if ( $products_num > 0 ) {
				// if result products ids are more than per_page then keep remaing ids as load more option.
				if ( $products_num > $product_per_page ) {
					$more_product_ids    = array_slice( $posts_ids, $product_per_page );
					$current_product_ids = array_slice( $posts_ids, 0, $product_per_page );
				} else {
					$current_product_ids = $posts_ids;
				}
				foreach ( $current_product_ids as $post_id ) {
					$product          = wc_get_product( $post_id );
					$products_array[] = $product;
				}
			}
			return array(
				'products'       => $products_array,
				'more_ids'       => $more_product_ids,
				'total_products' => $products_num,
			);
		}
	}
endif;