<?php defined( 'ABSPATH' ) || exit;

class VGSE_Provider_Custom_table extends VGSE_Provider_Abstract {

	protected static $instance       = false;
	public $key                      = 'custom_table';
	public $is_post_type             = false;
	public $last_request             = null;
	public static $data_store        = array();
	public $args                     = array();
	public $table_columns_cache      = array();
	public $post_data_table_id_cache = array();
	public $items_cache              = array();

	protected function __construct() {
	}

	function get_table_name( $post_type = null ) {
		if ( ! $post_type ) {
			$post_type = VGSE()->helpers->get_provider_from_query_string();
		}
		return $post_type;
	}

	function get_sheet_key( $post_type = null ) {
		// Allow to decouple the sheet key and db table name
		return $this->get_table_name( $post_type );
	}

	function prefetch_tables_structure( $table_names ) {
		$columns_transient_key    = 'vgse_custom_tables_columns';
		$params_transient_key     = 'vgse_custom_tables_params';
		$id_columns_transient_key = 'vgse_custom_tables_id_columns';
		$force_rescan             = false;

		$current_post_type = $this->get_sheet_key();
		if ( method_exists( VGSE()->helpers, 'can_rescan_db_fields' ) && VGSE()->helpers->can_rescan_db_fields( $current_post_type ) ) {
			$cached_columns    = array();
			$cached_params     = array();
			$cached_id_columns = array();
			$force_rescan      = true;
		} else {
			$cached_columns    = get_transient( $columns_transient_key );
			$cached_params     = get_transient( $params_transient_key );
			$cached_id_columns = get_transient( $id_columns_transient_key );

			if ( ! empty( $cached_columns ) ) {
				$cached_columns = json_decode( $cached_columns, true );
			}
			if ( ! empty( $cached_params ) ) {
				$cached_params = json_decode( $cached_params, true );
			}
		}
		if ( empty( $cached_columns ) ) {
			$cached_columns = array();
		}
		if ( empty( $cached_params ) ) {
			$cached_params = array();
		}
		if ( is_array( $cached_id_columns ) ) {
			$this->post_data_table_id_cache = wp_parse_args( $cached_id_columns, $this->post_data_table_id_cache );
		}

		$cached_schema = array();
		if ( $cached_params ) {
			foreach ( $cached_params as $table_name => $args ) {
				$cached_schema[ $table_name ]            = $args;
				$cached_schema[ $table_name ]['columns'] = $cached_columns[ $args['column_group_key'] ];
			}
		}
		if ( $cached_schema ) {
			$this->args = wp_parse_args( $cached_schema, $this->args );
		}
		foreach ( $table_names as $table_name ) {
			$this->maybe_build_table_schema( $table_name );
			$this->get_post_data_table_id_key( $table_name );
		}
		if ( $this->args !== $cached_schema || $force_rescan ) {
			$params  = array();
			$columns = array();
			foreach ( $this->args as $table_name => $args ) {
				$unique_column_group_key             = md5( json_encode( wp_list_pluck( $args['columns'], 'type', 'column_key' ) ) );
				$columns[ $unique_column_group_key ] = $args['columns'];
				unset( $args['columns'] );
				$args['column_group_key'] = $unique_column_group_key;
				$params[ $table_name ]    = $args;
			}

			set_transient( $columns_transient_key, json_encode( $this->utf8ize( $columns ) ), WEEK_IN_SECONDS );
			set_transient( $params_transient_key, json_encode( $params ), WEEK_IN_SECONDS );
			set_transient( $id_columns_transient_key, $this->post_data_table_id_cache, WEEK_IN_SECONDS );
		}
	}

	/* Use it for json_encode some corrupt UTF-8 chars
	 * useful for = malformed utf-8 characters possibly incorrectly encoded by json_encode
	 * https://stackoverflow.com/a/52641198
	 */

	function utf8ize( $mixed ) {
		if ( is_array( $mixed ) ) {
			foreach ( $mixed as $key => $value ) {
				$mixed[ $key ] = $this->utf8ize( $value );
			}
		} elseif ( is_string( $mixed ) ) {
			return mb_convert_encoding( $mixed, 'UTF-8', 'UTF-8' );
		}
		return $mixed;
	}

	function get_arg( $key, $post_type ) {
		$table_name = $this->get_table_name( $post_type );
		// Used prefetch_tables_structure instead of maybe_build_table_schema because it uses cache internally
		$this->prefetch_tables_structure( array( $table_name ) );

		return isset( $this->args[ $table_name ][ $key ] ) ? $this->args[ $table_name ][ $key ] : false;
	}

	function get_provider_read_capability( $post_type_key ) {
		return apply_filters( 'vgse_sheet_editor/provider/custom_table/read_capability/' . $post_type_key, 'manage_options' );
	}

	function delete_meta_key( $old_key, $post_type ) {
		global $wpdb;
		$meta_table_name = $this->get_meta_table_name( $post_type );
		if ( ! $meta_table_name ) {
			return 0;
		}

		$result = $wpdb->delete(
			$meta_table_name,
			array(
				'meta_key' => $old_key,
			)
		);
		return $result;
	}

	function rename_meta_key( $old_key, $new_key, $post_type ) {
		global $wpdb;
		$meta_table_name = $this->get_meta_table_name( $post_type );
		if ( ! $meta_table_name ) {
			return 0;
		}
		if ( is_string( $post_type ) ) {
			$post_type = array( $post_type );
		}
		$modified = (int) $wpdb->update(
			$meta_table_name,
			array(
				'meta_key' => $new_key,
			),
			array(
				'meta_key' => $old_key,
			)
		);
		return $modified;
	}

	function get_provider_edit_capability( $post_type_key ) {
		return apply_filters( 'vgse_sheet_editor/provider/custom_table/edit_capability/' . $post_type_key, 'manage_options' );
	}

	function get_provider_delete_capability( $post_type_key ) {
		return apply_filters( 'vgse_sheet_editor/provider/custom_table/delete_capability/' . $post_type_key, 'manage_options' );
	}

	function init() {
	}

	function get_total( $post_type = null ) {
		global $wpdb;
		$table_name = $this->get_table_name( $post_type );
		return $wpdb->get_var(
			$wpdb->prepare( 'SELECT COUNT(*) FROM %i', VGSE()->helpers->sanitize_table_key( $table_name ) )
		);
	}

	/**
	 * Creates or returns an instance of this class.
	 *
	 * @return  Foo A single instance of this class.
	 */
	static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new self();
			self::$instance->init();
		}
		return self::$instance;
	}

	function get_post_data_table_id_key( $post_type = null ) {
		global $wpdb;

		$table_name = $this->get_table_name( $post_type );

		if ( isset( $this->post_data_table_id_cache[ $table_name ] ) ) {
			return $this->post_data_table_id_cache[ $table_name ];
		}
		$result = $wpdb->get_row(
			$wpdb->prepare( 'SHOW KEYS FROM %i WHERE Key_name = "PRIMARY"', $table_name ),
			ARRAY_A
		);

		if ( ! $result ) {
			$int_column = $wpdb->get_row(
				$wpdb->prepare( 'SHOW COLUMNS FROM %i WHERE Type LIKE %s', $table_name, '%int%' )
			);
			if ( ! empty( $int_column ) ) {
				$result = array( 'Column_name' => $int_column->Field );
			}
		}

		if ( ! $result ) {
			return false;
		}

		if ( method_exists( VGSE()->helpers, 'sanitize_table_key' ) ) {
			$result['Column_name'] = VGSE()->helpers->sanitize_table_key( $result['Column_name'] );
		}
		$this->post_data_table_id_cache[ $table_name ] = $result['Column_name'];
		return $this->post_data_table_id_cache[ $table_name ];
	}

	function get_meta_table_post_id_key( $post_type = null ) {
		if ( ! $post_type ) {
			$post_type = $this->get_sheet_key( $post_type );
		}

		$post_id_key = apply_filters( 'vgse_sheet_editor/provider/custom_table/meta_table_post_id_key', null, $post_type );
		if ( method_exists( VGSE()->helpers, 'sanitize_table_key' ) ) {
			$post_id_key = VGSE()->helpers->sanitize_table_key( $post_id_key );
		}
		return $post_id_key;
	}

	function get_meta_table_name( $post_type = null ) {
		if ( ! $post_type ) {
			$post_type = $this->get_sheet_key();
		}

		$table_name = apply_filters( 'vgse_sheet_editor/provider/custom_table/meta_table_name', null, $post_type );
		if ( method_exists( VGSE()->helpers, 'sanitize_table_key' ) ) {
			$table_name = VGSE()->helpers->sanitize_table_key( $table_name );
		}
		return $table_name;
	}

	function prefetch_data( $post_ids, $post_type, $spreadsheet_columns ) {
	}

	function get_item_terms( $id, $table_name ) {
		$raw_value = '';
		return apply_filters( 'vg_sheet_editor/provider/custom_table/get_items_terms', $raw_value, $id, $table_name );
	}

	function get_statuses() {
		return array();
	}

	function get_items( $query_args ) {
		$post_type           = $query_args['post_type'];
		$post_keys_to_remove = array(
			'post_status',
			'author',
			'tax_query',
		);
		foreach ( $post_keys_to_remove as $post_key_to_remove ) {
			if ( isset( $query_args[ $post_key_to_remove ] ) ) {
				unset( $query_args[ $post_key_to_remove ] );
			}
		}

		$primary_key = $this->get_post_data_table_id_key( $post_type );

		if ( isset( $query_args['posts_per_page'] ) && $query_args['posts_per_page'] < 0 ) {
			$query_args['paginated'] = false;
		}
		if ( isset( $query_args['post__in'] ) ) {
			$query_args[ $primary_key ] = $query_args['post__in'];
		}
		if ( isset( $query_args['post__not_in'] ) ) {
			$query_args[ $primary_key . '__not' ] = $query_args['post__not_in'];
		}
		if ( ! empty( $query_args['fields'] ) && $query_args['fields'] === 'ids' ) {
			$query_args['query_select'] = 't.' . $primary_key;
		}
		if ( ! empty( $query_args['s'] ) ) {
			$query_args['s'] = $query_args['s'];
		}
		$query_args['count_total'] = false;

		$rows = $this->_get_rows( $query_args );

		$request = $this->last_request;
		$total   = (int) $this->_get_rows(
			array_merge(
				$query_args,
				array(
					'query_select' => 'COUNT(*)',
					'method'       => 'get_var',
					'paginated'    => false,
				)
			)
		);

		$out              = (object) array();
		$out->found_posts = $total;
		$out->posts       = array();
		$out->request     = $request;
		if ( ! empty( $rows ) ) {
			foreach ( $rows as $row ) {
				$row          = $this->_format_item( $row, $post_type );
				$out->posts[] = $row;
			}

			if ( ! empty( $query_args['fields'] ) && $query_args['fields'] === 'ids' ) {
				$out->posts = wp_list_pluck( $out->posts, 'ID' );
			}
		}
		// $out->posts must contain an array of objects

		return $out;
	}

	function _get_table_columns( $post_type ) {
		global $wpdb;
		$table_name = $this->get_table_name( $post_type );

		if ( isset( $this->table_columns_cache[ $table_name ] ) ) {
			return $this->table_columns_cache[ $table_name ];
		}
		$this->table_columns_cache[ $table_name ] = $wpdb->get_results(
			$wpdb->prepare( 'SHOW COLUMNS FROM %i', VGSE()->helpers->sanitize_table_key( $table_name ) ),
			ARRAY_A
		);
		return $this->table_columns_cache[ $table_name ];
	}

	function maybe_build_table_schema( $post_type ) {
		global $wpdb;
		$table_name = $this->get_table_name( $post_type );
		if ( ! empty( $this->args[ $table_name ] ) ) {
			return;
		}

		$columns        = $this->_get_table_columns( $post_type );
		$primary_column = $this->get_post_data_table_id_key( $post_type );
		$first_column   = current( $columns );
		if ( empty( $primary_column ) && ( empty( $first_column ) || $first_column['type'] !== 'numeric' ) ) {
			return;
		}

		$schema = array();

		foreach ( $columns as $column ) {
			$column_key    = $column['Field'];
			$type          = 'text';
			$sample_values = null;
			if ( stripos( $column['Type'], 'int' ) !== false ) {
				$type          = 'numeric';
				$sample_values = array( 1, 2, 3, 4 );
			} elseif ( $column['Type'] === 'datetime' ) {
				$type = 'dates';
			} elseif ( stripos( $column['Type'], 'decimal' ) !== false ) {
				$type = 'float';
			}

			if ( is_null( $sample_values ) ) {
				$sample_values = $wpdb->get_col(
					$wpdb->prepare(
						'SELECT %i FROM %i GROUP BY %i ORDER BY LENGTH(%i) DESC LIMIT 2',
						$column_key,
						VGSE()->helpers->sanitize_table_key( $post_type ),
						$column_key,
						$column_key
					)
				);
			}
			if ( empty( $sample_values ) ) {
				$sample_values = array();
			}
			$all_values = implode( ', ', $sample_values );
			// Set safe_html type if the sample values contain html
			if ( $type === 'text' && wp_strip_all_tags( $all_values ) !== $sample_values ) {
				$type = 'safe_html';
			}

			$schema[ $column_key ] = array(
				'default_value_insert' => $column['Default'] !== null ? $column['Default'] : '',
				'type'                 => $type,
				'column_key'           => $column_key,
				'sample_values'        => array_map( 'maybe_unserialize', $sample_values ),
			);
		}
		if ( empty( $schema ) ) {
			return;
		}
		$searchable_columns        = $this->get_searchable_column_keys( $post_type );
		$this->args[ $table_name ] = apply_filters(
			'vg_sheet_editor/provider/custom_table/table_schema',
			array(
				'default_order_by' => ( ! empty( $primary_column ) ) ? $primary_column : $first_column['column_key'],
				'default_order'    => 'DESC',
				'table_name'       => $post_type,
				's_columns'        => $searchable_columns,
				'columns'          => $schema,
			)
		);
	}

	function get_meta_query_sql( $table_name, $meta_table_name, $filters ) {
		global $wpdb;
		if ( empty( $filters ) ) {
			return false;
		}
		$meta_table_id_column  = $this->get_meta_table_post_id_key();
		$data_id_column        = $this->get_post_data_table_id_key( $table_name );
		$meta_key_column_key   = $this->_get_meta_key_column_key( $table_name );
		$meta_value_column_key = $this->_get_meta_value_column_key( $table_name );
		if ( empty( $meta_table_id_column ) || empty( $data_id_column ) || empty( $meta_key_column_key ) || empty( $meta_value_column_key ) ) {
			return false;
		}
		$query_args = array( 'meta_query' => $filters );
		$meta_query = new WP_Meta_Query();
		$meta_query->parse_query_vars( $query_args );
		$mq_sql          = $meta_query->get_sql(
			'post',
			't',
			$data_id_column,
			null
		);
		$search          = array(
			$wpdb->postmeta,
			$meta_table_name . '.post_id',
			$meta_table_name . '.meta_key',
			$meta_table_name . '.meta_value',
			'mt1.post_id',
		);
		$replace         = array(
			$meta_table_name,
			$meta_table_name . '.' . $meta_table_id_column,
			$meta_table_name . '.' . $meta_key_column_key,
			$meta_table_name . '.' . $meta_value_column_key,
			'mt1.' . $meta_table_id_column,
		);
		$mq_sql['join']  = str_replace( $search, $replace, $mq_sql['join'] );
		$mq_sql['where'] = str_replace( $search, $replace, $mq_sql['where'] );
		return $mq_sql;
	}

	function _get_rows( $args ) {
		global $wpdb;
		if ( empty( $args['post_type'] ) ) {
			$args['post_type'] = $this->get_sheet_key();
		}
		$defaults      = array(
			's'              => '',
			'posts_per_page' => 10,
			'paged'          => 1,
			'paginated'      => true,
			'query_select'   => '*',
			'order_by'       => $this->get_arg( 'default_order_by', $args['post_type'] ),
			'order'          => $this->get_arg( 'default_order', $args['post_type'] ),
			'group_by'       => '',
			'method'         => 'get_results',
		);
		$reserved_keys = array_keys( $defaults );
		$args          = wp_parse_args( $args, $defaults );

		// Sort array by key to normalize the cache
		ksort( $args );

		extract( $args );

		$table_name = $this->get_arg( 'table_name', $this->get_table_name() );

		// sanitization
		if ( ! empty( $s ) ) {
			$s = sanitize_text_field( $s );
		}
		if ( ! empty( $paged ) ) {
			$paged = intval( $paged );
		}
		if ( ! empty( $posts_per_page ) ) {
			$posts_per_page = intval( $posts_per_page );
		}

		if ( $query_select === '*' ) {
			$query_select = 't.*';
		}
		$sql = 'SELECT ' . $query_select . ' FROM ' . VGSE()->helpers->sanitize_table_key( $table_name ) . ' as t ';

		$prepared_data = array();
		$wheres        = array();

		if ( ! empty( $s ) ) {
			$s = esc_sql( $s );

			$s_conditions = array();
			foreach ( $this->get_arg( 's_columns', $args['post_type'] ) as $s_column ) {
				$s_conditions[]  = 't.' . VGSE()->helpers->sanitize_table_key( $s_column ) . ' LIKE %s';
				$prepared_data[] = '%' . $wpdb->esc_like( $s ) . '%';
			}
			$s_sql = '( ' . implode( ' OR ', $s_conditions ) . ' ) ';

			$wheres[] = $s_sql;
		}

		foreach ( $this->get_arg( 'columns', $args['post_type'] ) as $column_key => $column ) {
			if ( in_array( $column_key, $reserved_keys, true ) ) {
				continue;
			}
			// We don't support filter by post_type column because it conflicts with the spreadsheet key
			if ( $column_key === 'post_type' ) {
				continue;
			}
			if ( ! isset( $args[ $column_key ] ) ) {
				continue;
			}
			if ( empty( $args[ $column_key ] ) ) {
				$args[ $column_key ] = $column['default_value_get'];
			}
			$column_key = VGSE()->helpers->sanitize_table_key( $column_key );

			if ( $column['type'] === 'numeric' ) {

				if ( is_array( $args[ $column_key ] ) ) {
					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $column_key ] ), '%d' ) );
					$wheres[]                    = "t.$column_key IN ($value_in_query_placeholders)";
					$prepared_data               = array_merge( $prepared_data, array_map( 'intval', $args[ $column_key ] ) );
				} else {
					$wheres[]        = "t.$column_key = %d";
					$prepared_data[] = intval( $args[ $column_key ] );
				}
			} elseif ( $column['type'] === 'float' ) {

				if ( is_array( $args[ $column_key ] ) ) {
					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $column_key ] ), '%f' ) );
					$wheres[]                    = "t.$column_key IN ($value_in_query_placeholders) ";
					$prepared_data               = array_merge( $prepared_data, array_map( 'floatval', $args[ $column_key ] ) );
				} else {
					$wheres[]        = "t.$column_key = %f";
					$prepared_data[] = floatval( $args[ $column_key ] );
				}
			} elseif ( $column['type'] === 'dates' ) {
				if ( ! empty( $args[ $column_key ] ) ) {
					$wheres[]        = "t.$column_key LIKE %s";
					$prepared_data[] = '%' . $wpdb->esc_like( $args[ $column_key ] ) . '%';
				} else {
					if ( ! empty( $args[ $column_key . '_after' ] ) ) {
						$wheres[]        = "t.$column_key > %s";
						$prepared_data[] = $args[ $column_key . '_after' ];
					}
					if ( ! empty( $args[ $column_key . '_before' ] ) ) {
						$wheres[]        = "t.$column_key < %s";
						$prepared_data[] = $args[ $column_key . '_before' ];
					}
				}
			} else {

				if ( is_array( $args[ $column_key ] ) ) {
					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $column_key ] ), '%s' ) );
					$wheres[]                    = "t.$column_key IN ($value_in_query_placeholders)";
					$prepared_data               = array_merge( $prepared_data, array_map( 'wp_kses_post', $args[ $column_key ] ) );
				} else {
					$wheres[]        = "t.$column_key = %s";
					$prepared_data[] = wp_kses_post( $args[ $column_key ] );
				}
			}
		}

		// Not clausses
		foreach ( $this->get_arg( 'columns', $args['post_type'] ) as $column_key => $column ) {
			$not_arg_key = $column_key . '__not';
			if ( empty( $args[ $not_arg_key ] ) ) {
				continue;
			}

			if ( $column['type'] === 'numeric' ) {

				if ( is_array( $args[ $not_arg_key ] ) ) {
					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $not_arg_key ] ), '%d' ) );
					$wheres[]                    = "t.$column_key NOT IN ($value_in_query_placeholders)";
					$prepared_data               = array_merge( $prepared_data, array_map( 'intval', $args[ $not_arg_key ] ) );
				} else {
					$wheres[]        = "t.$column_key != %d";
					$prepared_data[] = intval( $args[ $not_arg_key ] );
				}
			} elseif ( $column['type'] === 'float' ) {

				if ( is_array( $args[ $not_arg_key ] ) ) {
					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $not_arg_key ] ), '%f' ) );
					$wheres[]                    = "t.$column_key NOT IN ($value_in_query_placeholders)";
					$prepared_data               = array_merge( $prepared_data, array_map( 'floatval', $args[ $not_arg_key ] ) );
				} else {
					$wheres[]        = "t.$column_key != %f";
					$prepared_data[] = floatval( $args[ $not_arg_key ] );
				}
			} elseif ( $column['type'] === 'dates' ) {
				if ( ! empty( $args[ $not_arg_key ] ) ) {
					$wheres[]        = "t.$column_key NOT LIKE %s ";
					$prepared_data[] = '%' . $wpdb->esc_like( $args[ $not_arg_key ] ) . '%';
				} else {
					// devolver los que tienen un tripSection futuro
					if ( ! empty( $args[ $not_arg_key . '_after' ] ) ) {
						$wheres[]        = "t.$column_key < %s";
						$prepared_data[] = $args[ $not_arg_key . '_after' ];
					}
					if ( ! empty( $args[ $not_arg_key . '_before' ] ) ) {
						$wheres[]        = "t.$column_key > %s";
						$prepared_data[] = $args[ $not_arg_key . '_before' ];
					}
				}
			} else {

				if ( is_array( $args[ $not_arg_key ] ) ) {

					$value_in_query_placeholders = implode( ', ', array_fill( 0, count( $args[ $not_arg_key ] ), '%s' ) );
					$wheres[]                    = "t.$column_key NOT IN ($value_in_query_placeholders)";
					$prepared_data               = array_merge( $prepared_data, array_map( 'wp_kses_post', $args[ $not_arg_key ] ) );
				} else {
					$wheres[]        = "t.$column_key != %s";
					$prepared_data[] = wp_kses_post( $args[ $not_arg_key ] );
				}
			}
		}

		$sql .= ( ! empty( $wheres ) ) ? ' WHERE ' . implode( ' AND ', $wheres ) : '';
		if ( ! empty( $group_by ) ) {
			$sql .= ' GROUP BY ' . esc_sql( $group_by );
		}

		if ( ! empty( $order_by ) && ! empty( $order ) ) {
			$orderby_sql = ' ORDER BY t.' . esc_sql( $order_by ) . ' ' . esc_sql( strtoupper( $order ) );
			$sql        .= $orderby_sql;
		}

		if ( $paginated && ! empty( $paged ) && ! empty( $posts_per_page ) ) {
			$offset = ( $paged < 2 ) ? 0 : ( $paged - 1 ) * (int) $posts_per_page;
			$sql   .= ' LIMIT ' . intval( $offset ) . ',' . intval( $posts_per_page );
		}

		if ( strpos( $sql, 'GROUP BY' ) !== false && strpos( $sql, 'COUNT(*)' ) !== false ) {
			$sql = 'SELECT COUNT(*) FROM (' . str_replace( 'COUNT(*)', '*', $sql ) . ') tt';
		}

		$sql = apply_filters( 'vg_sheet_editor/provider/custom_table/get_rows_sql', $sql, $args, $this->args[ $table_name ] );
		if ( empty( $prepared_data ) ) {
			$prepared_sql = $sql;
		} else {
			$prepared_sql = $wpdb->prepare( $sql, $prepared_data );
		}

		// Don't order the rows when we just need the count
		if ( $args['query_select'] === 'COUNT(*)' && ! empty( $orderby_sql ) ) {
			$prepared_sql = str_replace( $orderby_sql, '', $prepared_sql );
		}
		$results = ( $method === 'get_results' ) ? $wpdb->get_results( $prepared_sql, OBJECT ) : $wpdb->get_var( $prepared_sql );
		// This regex removes the 64-characters that WP adds as placeholders for %
		$this->last_request = preg_replace( '/\{[a-z0-9_]{64}\}/', '%', $prepared_sql );

		return apply_filters( 'vg_sheet_editor/provider/custom_table/get_rows_results', $results, $args, $this->args[ $table_name ], $sql );
	}

	function _insert_row( $data ) {
		global $wpdb;

		if ( empty( $data['post_type'] ) ) {
			$data['post_type'] = $this->get_sheet_key();
		}
		$table_name = $this->get_table_name( $data['post_type'] );

		$primary_column_key = $this->get_post_data_table_id_key( $data['post_type'] );
		$original_data      = $data;
		$context            = ( ! empty( $data['ID'] ) ) ? 'update' : 'insert';
		$item_id            = ( $context === 'update' ) ? (int) $data['ID'] : null;
		$new_data_format    = array();
		$new_data           = array();
		foreach ( $this->get_arg( 'columns', $data['post_type'] ) as $column_key => $column ) {
			if ( ! isset( $data[ $column_key ] ) || ( empty( $data[ $column_key ] ) && ! is_numeric( $data[ $column_key ] ) ) ) {
				$data[ $column_key ] = $column['default_value_insert'];
			}
			if ( $column['type'] === 'numeric' ) {
				$new_data[ $column_key ]        = (int) $data[ $column_key ];
				$new_data_format[ $column_key ] = '%d';
			} elseif ( $column['type'] === 'float' ) {
				$new_data[ $column_key ]        = (float) $data[ $column_key ];
				$new_data_format[ $column_key ] = '%s';
			} elseif ( $column['type'] === 'slug' ) {
				$new_data[ $column_key ]        = sanitize_title( $data[ $column_key ] );
				$new_data_format[ $column_key ] = '%s';
			} elseif ( $column['type'] === 'safe_html' ) {
				$new_data[ $column_key ]        = wp_kses_post( $data[ $column_key ] );
				$new_data_format[ $column_key ] = '%s';
			} else {
				$new_data[ $column_key ]        = sanitize_text_field( $data[ $column_key ] );
				$new_data_format[ $column_key ] = '%s';
			}
			if ( ! empty( $new_data[ $column_key ] ) ) {
				$new_data[ $column_key ] = wp_unslash( $new_data[ $column_key ] );
			}
		}

		if ( $context === 'insert' ) {

			$new_data        = apply_filters( 'saas/db_table_manager/insert_data', $new_data, $original_data, $this->args[ $table_name ] );
			$new_data_format = apply_filters( 'saas/db_table_manager/insert_data_format', $new_data_format, $original_data, $this->args[ $table_name ] );

			if ( isset( $new_data['ID'] ) ) {
				unset( $new_data['ID'] );
			}
			if ( isset( $new_data_format['ID'] ) ) {
				unset( $new_data_format['ID'] );
			}

			$result = $wpdb->insert(
				$table_name,
				$new_data,
				$new_data_format
			);
		} else {
			// if it's a data update, we only update the data that was defined
			// during the API request. This way, we avoid deleting data that were omitted
			// because they are not to be updated; we only delete them if the API is called with
			// empty values
			$new_data        = array_intersect_key( $new_data, $original_data );
			$new_data_format = array_values( array_intersect_key( $new_data_format, $new_data ) );

			$new_data        = apply_filters( 'saas/db_table_manager/update_data', $new_data, $original_data, $this->args[ $table_name ] );
			$new_data_format = apply_filters( 'saas/db_table_manager/update_data_format', $new_data_format, $original_data, $this->args[ $table_name ] );

			if ( ! empty( $new_data ) ) {
				$new_data_columns = array_keys( $new_data );
				if ( in_array( 'ID', $new_data_columns, true ) ) {
					$id_column_index                 = array_search( 'ID', $new_data_columns, true );
					$new_data[ $primary_column_key ] = $new_data['ID'];
					unset( $new_data['ID'] );
					unset( $new_data_format[ $id_column_index ] );
				}
				$result = $wpdb->update(
					$table_name,
					$new_data,
					array(
						$primary_column_key => (int) $original_data['ID'],
					),
					$new_data_format,
					array( '%d' )
				);
			} else {
				$result = true;
			}
		}

		if ( $result === false ) {
			return false;
		}

		$id = ( ! empty( $data['ID'] ) ) ? (int) $data['ID'] : $wpdb->insert_id;

		if ( ! $id ) {
			return false;
		}

		do_action( 'saas/db_table_manager/after_insert_row', $id, $new_data, $original_data, $this->args[ $table_name ], $data['post_type'] );

		return $id;
	}

	function _delete_row( $id, $post_type ) {
		global $wpdb;

		$table_name = $this->get_table_name( $post_type );
		$result     = $wpdb->delete(
			$table_name,
			array(
				$this->get_post_data_table_id_key( $post_type ) => (int) $id,
			),
			array(
				'%d',
			)
		);
	}

	function _format_item( $row, $post_type ) {
		$primary_key = $this->get_post_data_table_id_key( $post_type );
		if ( is_object( $row ) ) {
			$row->post_type    = $post_type;
			$row->provider     = $post_type;
			$row->ID           = (int) $row->$primary_key;
			$row->$primary_key = (int) $row->$primary_key;
		} else {
			$row['post_type']    = $post_type;
			$row['provider']     = $post_type;
			$row['ID']           = (int) $row[ $primary_key ];
			$row[ $primary_key ] = (int) $row[ $primary_key ];
		}
		return $row;
	}

	function get_item( $id, $format = null ) {
		$cache_key = 'i' . $id . $format;
		if ( isset( $this->items_cache[ $cache_key ] ) ) {
			return $this->items_cache[ $cache_key ];
		}
		$post_type = $this->get_sheet_key();
		$rows      = $this->_get_rows(
			array(
				'posts_per_page' => 1,
				$this->get_post_data_table_id_key( $post_type ) => $id,
			)
		);

		if ( empty( $rows ) ) {
			$this->items_cache[ $cache_key ] = false;
			return false;
		}
		$row = current( $rows );
		$row = $this->_format_item( $row, $post_type );

		if ( $format == OBJECT ) {
			$row = (object) $row;
		}
		$out = apply_filters( 'vg_sheet_editor/provider/custom_table/get_item', $row, $id, $format );

		$this->items_cache[ $cache_key ] = $out;
		return $out;
	}

	function _get_meta_value_column_key( $post_type ) {
		return VGSE()->helpers->sanitize_table_key( apply_filters( 'vg_sheet_editor/provider/custom_table/meta_value_column_key', 'meta_value', $post_type ) );
	}

	function _get_meta_key_column_key( $post_type ) {
		return VGSE()->helpers->sanitize_table_key( apply_filters( 'vg_sheet_editor/provider/custom_table/meta_key_column_key', 'meta_key', $post_type ) );
	}

	function get_item_meta( $id, $key, $single = true, $context = 'save', $bypass_cache = false ) {
		global $wpdb;
		$value                = '';
		$meta_table_name      = $this->get_meta_table_name();
		$meta_table_id_column = $this->get_meta_table_post_id_key();
		$post_type            = $this->get_sheet_key();
		$meta_value_column    = $this->_get_meta_value_column_key( $post_type );
		$meta_key_column      = $this->_get_meta_key_column_key( $post_type );

		if ( $meta_table_id_column && $meta_table_name ) {
			$value = $wpdb->get_var( $wpdb->prepare( 'SELECT %i FROM %i WHERE %i = %s AND %i = %d LIMIT 1', $meta_value_column, $meta_table_name, $meta_key_column, $key, $meta_table_id_column, $id ) );
		}
		return apply_filters( 'vg_sheet_editor/provider/custom_table/get_item_meta', $value, $id, $key, $single, $context );
	}

	function get_item_data( $id, $key ) {
		$item  = $this->get_item( $id );
		$value = ( isset( $item->$key ) ) ? $item->$key : '';
		return apply_filters( 'vg_sheet_editor/provider/custom_table/get_item_data', $value, $id, $key, true, 'read' );
	}

	function update_item_data( $values, $wp_error = false ) {
		$post_type       = $this->get_sheet_key();
		$edit_capability = $this->get_provider_edit_capability( $post_type );
		if ( ! WP_Sheet_Editor_Helpers::current_user_can( $edit_capability ) ) {
			return false;
		}

		$id = $values['ID'];
		if ( ! empty( $values['wpse_status'] ) && $values['wpse_status'] === 'delete' ) {
			do_action( 'vg_sheet_editor/provider/custom_table/before_delete_row', $id, $post_type );
			if ( apply_filters( 'vg_sheet_editor/provider/custom_table/delete_row_handler', null, $id, $post_type ) === null ) {
				$this->_delete_row( $id, $post_type );
			}
			VGSE()->deleted_rows_ids[] = (int) $id;
		} else {
			$this->_insert_row( $values );
		}

		return $id;
	}

	function delete_item_meta( $id, $key ) {
		global $wpdb;
		$meta_table_name      = $this->get_meta_table_name();
		$meta_table_id_column = $this->get_meta_table_post_id_key();

		if ( ! $meta_table_name || ! $meta_table_id_column ) {
			return false;
		}
		$post_type       = $this->get_sheet_key();
		$meta_key_column = $this->_get_meta_key_column_key( $post_type );

		$meta_row_exists = (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM %i WHERE %i = %s AND %i = %d', $meta_table_name, $meta_key_column, $key, $meta_table_id_column, $id ) );

		if ( $meta_row_exists ) {
			$wpdb->delete(
				$meta_table_name,
				array(
					$meta_key_column      => $key,
					$meta_table_id_column => $id,
				)
			);
		}

		return true;
	}

	function update_item_meta( $id, $key, $value ) {
		global $wpdb;
		$meta_table_name      = $this->get_meta_table_name();
		$meta_table_id_column = $this->get_meta_table_post_id_key();

		if ( ! $meta_table_name || ! $meta_table_id_column ) {
			return false;
		}
		$post_type         = $this->get_sheet_key();
		$meta_value_column = $this->_get_meta_value_column_key( $post_type );
		$meta_key_column   = $this->_get_meta_key_column_key( $post_type );

		$meta_row_exists = (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM %i WHERE %i = %s AND %i = %d', $meta_table_name, $meta_key_column, $key, $meta_table_id_column, $id ) );

		if ( $meta_row_exists ) {
			$wpdb->update(
				$meta_table_name,
				array(
					$meta_value_column => wp_kses_post( apply_filters( 'vg_sheet_editor/provider/custom_table/update_item_meta', $value, $id, $key ) ),
				),
				array(
					$meta_key_column      => $key,
					$meta_table_id_column => $id,
				)
			);
		} else {
			$wpdb->insert(
				$meta_table_name,
				array(
					$meta_value_column    => wp_kses_post( apply_filters( 'vg_sheet_editor/provider/custom_table/update_item_meta', $value, $id, $key ) ),
					$meta_key_column      => $key,
					$meta_table_id_column => $id,
				)
			);
		}

		return true;
	}

	function set_object_terms( $post_id, $terms_saved, $key ) {
		// Custom tables don't have taxonomies
	}

	function get_object_taxonomies( $post_type = null ) {
		return get_taxonomies( array(), 'objects' );
	}

	function create_item( $values ) {
		$post_type       = $this->get_sheet_key();
		$edit_capability = $this->get_provider_edit_capability( $post_type );
		if ( ! WP_Sheet_Editor_Helpers::current_user_can( $edit_capability ) ) {
			return false;
		}

		$new_id = $this->_insert_row( $values );

		return $new_id;
	}

	function get_searchable_column_keys( $post_type ) {
		$all_columns = $this->_get_table_columns( $post_type );
		$out         = array();
		foreach ( $all_columns as $column ) {
			// We only search in date, text, varchar columns (text columns)
			if ( ! preg_match( '/date|text|varchar/', $column['Type'] ) ) {
				continue;
			}
			$out[] = $column['Field'];
		}
		return $out;
	}

	function get_item_ids_by_keyword( $keyword, $post_type, $operator = 'LIKE' ) {
		global $wpdb;
		$operator = ( $operator === 'LIKE' ) ? 'LIKE' : 'NOT LIKE';

		$primary_key_column = esc_sql( $this->get_post_data_table_id_key( $post_type ) );
		$searchable_columns = $this->get_searchable_column_keys( $post_type );

		$checks        = array();
		$keywords      = array_map( 'trim', explode( ';', $keyword ) );
		$prepared_data = array();
		foreach ( $keywords as $single_keyword ) {
			$single_check = array();
			foreach ( $searchable_columns as $column ) {
				$single_check[]  = $column . ' LIKE %s ';
				$prepared_data[] = '%' . $wpdb->esc_like( $single_keyword ) . '%';
			}
			if ( ! empty( $single_check ) ) {
				$checks[] = ' (' . implode( ' OR  ', $single_check ) . ' ) ';
			}
		}

		$ids = $wpdb->get_col( $wpdb->prepare( "SELECT $primary_key_column FROM " . VGSE()->helpers->sanitize_table_key( $post_type ) . ' WHERE ' . implode( ' OR ', $checks ), $prepared_data ) );
		return $ids;
	}

	function get_meta_object_id_field( $field_key, $column_settings ) {
		$id_key = $this->get_meta_table_post_id_key();
		return $id_key;
	}

	function get_table_name_for_field( $field_key, $column_settings ) {
		global $wpdb;

		$sheet_key            = $this->get_sheet_key();
		$post_data_table_name = $this->get_table_name( $sheet_key );

		$meta_table = $this->get_meta_table_name( $sheet_key );
		if ( $meta_table && ! $wpdb->get_var( $wpdb->prepare( 'SELECT COLUMN_NAME FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s AND COLUMN_NAME = %s', DB_NAME, $post_data_table_name, $field_key ) ) ) {
			$out = $meta_table;
		} else {
			$out = $this->get_table_name( $sheet_key );
		}

		if ( method_exists( VGSE()->helpers, 'sanitize_table_key' ) ) {
			$out = VGSE()->helpers->sanitize_table_key( $out );
		}
		return $out;
	}

	function get_meta_field_unique_values( $meta_key, $post_type = null ) {
		global $wpdb;
		$post_meta_table   = $this->get_meta_table_name( $post_type );
		$meta_value_column = $this->_get_meta_value_column_key( $post_type );

		if ( $post_meta_table === $post_type ) {
			$values = apply_filters( 'vg_sheet_editor/provider/custom_table/meta_field_unique_values', array(), $meta_key, $post_type );
			return $values;
		}

		$sql    = $wpdb->prepare( 'SELECT m.%i FROM %i m WHERE m.meta_key = %s GROUP BY m.%i ORDER BY LENGTH(m.%i) DESC LIMIT 4', $meta_value_column, $post_meta_table, $meta_key, $meta_value_column, $meta_value_column );
		$values = apply_filters( 'vg_sheet_editor/provider/custom_table/meta_field_unique_values', $wpdb->get_col( $sql ), $meta_key, $post_type );

		// Remove any field value with extremely long length (5mb) to avoid high memory usage
		foreach ( $values as $index => $value ) {
			if ( is_string( $value ) && strlen( $value ) > 5000000 ) {
				unset( $values[ $index ] );
			}
		}
		return $values;
	}

	function get_all_meta_fields( $post_type = null ) {
		global $wpdb;
		$pre_value = apply_filters( 'vg_sheet_editor/provider/custom_table/all_meta_fields_pre_value', null, $post_type );

		if ( is_array( $pre_value ) ) {
			return $pre_value;
		}
		$max_fields_limit      = VGSE()->get_option( 'meta_fields_scan_limit', 2500 );
		$post_meta_table       = $this->get_meta_table_name( $post_type );
		$post_meta_post_id_key = $this->get_meta_table_post_id_key( $post_type );
		$meta_value_column     = $this->_get_meta_value_column_key( $post_type );
		$meta_key_column       = $this->_get_meta_key_column_key( $post_type );

		if ( ! empty( $post_meta_table ) && ! empty( $post_meta_post_id_key ) ) {
			$meta_keys_sql = $wpdb->prepare( "SELECT m.$meta_key_column FROM $post_meta_table m WHERE m.$meta_key_column NOT LIKE '%oembed%' AND m.$meta_value_column NOT LIKE 'field_%' GROUP BY m.$meta_key_column LIMIT %d", $max_fields_limit );
			$meta_keys     = $wpdb->get_col( $meta_keys_sql );
		} else {
			$meta_keys = array();
		}
		return apply_filters( 'vg_sheet_editor/provider/custom_table/all_meta_fields', $meta_keys, $post_type );
	}
}
