<?php
/**
 * WC_Product_Data_Store_CPT class file.
 *
 * @package ClassicCommerce/Classes
 */

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

/**
 * WC Product Data Store: Stored in CPT.
 *
 * @version  WC-3.0.0
 */
class WC_Product_Data_Store_CPT extends WC_Data_Store_WP implements WC_Object_Data_Store_Interface, WC_Product_Data_Store_Interface {

	/**
	 * Data stored in meta keys, but not considered "meta".
	 *
	 * @since WC-3.0.0
	 * @var array
	 */
	protected $internal_meta_keys = array(
		'_visibility',
		'_sku',
		'_price',
		'_regular_price',
		'_sale_price',
		'_sale_price_dates_from',
		'_sale_price_dates_to',
		'total_sales',
		'_tax_status',
		'_tax_class',
		'_manage_stock',
		'_stock',
		'_stock_status',
		'_backorders',
		'_low_stock_amount',
		'_sold_individually',
		'_weight',
		'_length',
		'_width',
		'_height',
		'_upsell_ids',
		'_crosssell_ids',
		'_purchase_note',
		'_default_attributes',
		'_product_attributes',
		'_virtual',
		'_downloadable',
		'_download_limit',
		'_download_expiry',
		'_featured',
		'_downloadable_files',
		'_wc_rating_count',
		'_wc_average_rating',
		'_wc_review_count',
		'_variation_description',
		'_thumbnail_id',
		'_file_paths',
		'_product_image_gallery',
		'_product_version',
		'_wp_old_slug',
		'_edit_last',
		'_edit_lock',
	);

	/**
	 * If we have already saved our extra data, don't do automatic / default handling.
	 *
	 * @var bool
	 */
	protected $extra_data_saved = false;

	/**
	 * Stores updated props.
	 *
	 * @var array
	 */
	protected $updated_props = array();

	/*
	|--------------------------------------------------------------------------
	| CRUD Methods
	|--------------------------------------------------------------------------
	*/

	/**
	 * Method to create a new product in the database.
	 *
	 * @param WC_Product $product Product object.
	 */
	public function create( &$product ) {
		if ( ! $product->get_date_created( 'edit' ) ) {
			$product->set_date_created( current_time( 'timestamp', true ) );
		}

		$id = wp_insert_post(
			apply_filters(
				'woocommerce_new_product_data', array(
					'post_type'      => 'product',
					'post_status'    => $product->get_status() ? $product->get_status() : 'publish',
					'post_author'    => get_current_user_id(),
					'post_title'     => $product->get_name() ? $product->get_name() : __( 'Product', 'classic-commerce' ),
					'post_content'   => $product->get_description(),
					'post_excerpt'   => $product->get_short_description(),
					'post_parent'    => $product->get_parent_id(),
					'comment_status' => $product->get_reviews_allowed() ? 'open' : 'closed',
					'ping_status'    => 'closed',
					'menu_order'     => $product->get_menu_order(),
					'post_date'      => gmdate( 'Y-m-d H:i:s', $product->get_date_created( 'edit' )->getOffsetTimestamp() ),
					'post_date_gmt'  => gmdate( 'Y-m-d H:i:s', $product->get_date_created( 'edit' )->getTimestamp() ),
					'post_name'      => $product->get_slug( 'edit' ),
				)
			), true
		);

		if ( $id && ! is_wp_error( $id ) ) {
			$product->set_id( $id );

			$this->update_post_meta( $product, true );
			$this->update_terms( $product, true );
			$this->update_visibility( $product, true );
			$this->update_attributes( $product, true );
			$this->update_version_and_type( $product );
			$this->handle_updated_props( $product );

			$product->save_meta_data();
			$product->apply_changes();

			$this->clear_caches( $product );

			do_action( 'woocommerce_new_product', $id );
		}
	}

	/**
	 * Method to read a product from the database.
	 *
	 * @param WC_Product $product Product object.
	 * @throws Exception If invalid product.
	 */
	public function read( &$product ) {
		$product->set_defaults();
		$post_object = get_post( $product->get_id() );

		if ( ! $product->get_id() || ! $post_object || 'product' !== $post_object->post_type ) {
			throw new Exception( __( 'Invalid product.', 'classic-commerce' ) );
		}

		$product->set_props(
			array(
				'name'              => $post_object->post_title,
				'slug'              => $post_object->post_name,
				'date_created'      => 0 < $post_object->post_date_gmt ? wc_string_to_timestamp( $post_object->post_date_gmt ) : null,
				'date_modified'     => 0 < $post_object->post_modified_gmt ? wc_string_to_timestamp( $post_object->post_modified_gmt ) : null,
				'status'            => $post_object->post_status,
				'description'       => $post_object->post_content,
				'short_description' => $post_object->post_excerpt,
				'parent_id'         => $post_object->post_parent,
				'menu_order'        => $post_object->menu_order,
				'reviews_allowed'   => 'open' === $post_object->comment_status,
			)
		);

		$this->read_attributes( $product );
		$this->read_downloads( $product );
		$this->read_visibility( $product );
		$this->read_product_data( $product );
		$this->read_extra_data( $product );
		$product->set_object_read( true );
	}

	/**
	 * Method to update a product in the database.
	 *
	 * @param WC_Product $product Product object.
	 */
	public function update( &$product ) {
		$product->save_meta_data();
		$changes = $product->get_changes();

		// Only update the post when the post data changes.
		if ( array_intersect( array( 'description', 'short_description', 'name', 'parent_id', 'reviews_allowed', 'status', 'menu_order', 'date_created', 'date_modified', 'slug' ), array_keys( $changes ) ) ) {
			$post_data = array(
				'post_content'   => $product->get_description( 'edit' ),
				'post_excerpt'   => $product->get_short_description( 'edit' ),
				'post_title'     => $product->get_name( 'edit' ),
				'post_parent'    => $product->get_parent_id( 'edit' ),
				'comment_status' => $product->get_reviews_allowed( 'edit' ) ? 'open' : 'closed',
				'post_status'    => $product->get_status( 'edit' ) ? $product->get_status( 'edit' ) : 'publish',
				'menu_order'     => $product->get_menu_order( 'edit' ),
				'post_name'      => $product->get_slug( 'edit' ),
				'post_type'      => 'product',
			);
			if ( $product->get_date_created( 'edit' ) ) {
				$post_data['post_date']     = gmdate( 'Y-m-d H:i:s', $product->get_date_created( 'edit' )->getOffsetTimestamp() );
				$post_data['post_date_gmt'] = gmdate( 'Y-m-d H:i:s', $product->get_date_created( 'edit' )->getTimestamp() );
			}
			if ( isset( $changes['date_modified'] ) && $product->get_date_modified( 'edit' ) ) {
				$post_data['post_modified']     = gmdate( 'Y-m-d H:i:s', $product->get_date_modified( 'edit' )->getOffsetTimestamp() );
				$post_data['post_modified_gmt'] = gmdate( 'Y-m-d H:i:s', $product->get_date_modified( 'edit' )->getTimestamp() );
			} else {
				$post_data['post_modified']     = current_time( 'mysql' );
				$post_data['post_modified_gmt'] = current_time( 'mysql', 1 );
			}

			/**
			 * When updating this object, to prevent infinite loops, use $wpdb
			 * to update data, since wp_update_post spawns more calls to the
			 * save_post action.
			 *
			 * This ensures hooks are fired by either WP itself (admin screen save),
			 * or an update purely from CRUD.
			 */
			if ( doing_action( 'save_post' ) ) {
				$GLOBALS['wpdb']->update( $GLOBALS['wpdb']->posts, $post_data, array( 'ID' => $product->get_id() ) );
				clean_post_cache( $product->get_id() );
			} else {
				wp_update_post( array_merge( array( 'ID' => $product->get_id() ), $post_data ) );
			}
			$product->read_meta_data( true ); // Refresh internal meta data, in case things were hooked into `save_post` or another WP hook.

		} else { // Only update post modified time to record this save event.
			$GLOBALS['wpdb']->update(
				$GLOBALS['wpdb']->posts,
				array(
					'post_modified'     => current_time( 'mysql' ),
					'post_modified_gmt' => current_time( 'mysql', 1 ),
				),
				array(
					'ID' => $product->get_id(),
				)
			);
			clean_post_cache( $product->get_id() );
		}

		$this->update_post_meta( $product );
		$this->update_terms( $product );
		$this->update_visibility( $product );
		$this->update_attributes( $product );
		$this->update_version_and_type( $product );
		$this->handle_updated_props( $product );

		$product->apply_changes();

		$this->clear_caches( $product );

		do_action( 'woocommerce_update_product', $product->get_id() );
	}

	/**
	 * Method to delete a product from the database.
	 *
	 * @param WC_Product $product Product object.
	 * @param array      $args Array of args to pass to the delete method.
	 */
	public function delete( &$product, $args = array() ) {
		$id        = $product->get_id();
		$post_type = $product->is_type( 'variation' ) ? 'product_variation' : 'product';

		$args = wp_parse_args(
			$args, array(
				'force_delete' => false,
			)
		);

		if ( ! $id ) {
			return;
		}

		if ( $args['force_delete'] ) {
			do_action( 'woocommerce_before_delete_' . $post_type, $id );
			wp_delete_post( $id );
			$product->set_id( 0 );
			do_action( 'woocommerce_delete_' . $post_type, $id );
		} else {
			wp_trash_post( $id );
			$product->set_status( 'trash' );
			do_action( 'woocommerce_trash_' . $post_type, $id );
		}
	}

	/*
	|--------------------------------------------------------------------------
	| Additional Methods
	|--------------------------------------------------------------------------
	*/

	/**
	 * Read product data. Can be overridden by child classes to load other props.
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function read_product_data( &$product ) {
		$id             = $product->get_id();
		$review_count   = get_post_meta( $id, '_wc_review_count', true );
		$rating_counts  = get_post_meta( $id, '_wc_rating_count', true );
		$average_rating = get_post_meta( $id, '_wc_average_rating', true );

		if ( '' === $review_count ) {
			WC_Comments::get_review_count_for_product( $product );
		} else {
			$product->set_review_count( $review_count );
		}

		if ( '' === $rating_counts ) {
			WC_Comments::get_rating_counts_for_product( $product );
		} else {
			$product->set_rating_counts( $rating_counts );
		}

		if ( '' === $average_rating ) {
			WC_Comments::get_average_rating_for_product( $product );
		} else {
			$product->set_average_rating( $average_rating );
		}

		$product->set_props(
			array(
				'sku'                => get_post_meta( $id, '_sku', true ),
				'regular_price'      => get_post_meta( $id, '_regular_price', true ),
				'sale_price'         => get_post_meta( $id, '_sale_price', true ),
				'price'              => get_post_meta( $id, '_price', true ),
				'date_on_sale_from'  => get_post_meta( $id, '_sale_price_dates_from', true ),
				'date_on_sale_to'    => get_post_meta( $id, '_sale_price_dates_to', true ),
				'total_sales'        => get_post_meta( $id, 'total_sales', true ),
				'tax_status'         => get_post_meta( $id, '_tax_status', true ),
				'tax_class'          => get_post_meta( $id, '_tax_class', true ),
				'manage_stock'       => get_post_meta( $id, '_manage_stock', true ),
				'stock_quantity'     => get_post_meta( $id, '_stock', true ),
				'stock_status'       => get_post_meta( $id, '_stock_status', true ),
				'backorders'         => get_post_meta( $id, '_backorders', true ),
				'low_stock_amount'   => get_post_meta( $id, '_low_stock_amount', true ),
				'sold_individually'  => get_post_meta( $id, '_sold_individually', true ),
				'weight'             => get_post_meta( $id, '_weight', true ),
				'length'             => get_post_meta( $id, '_length', true ),
				'width'              => get_post_meta( $id, '_width', true ),
				'height'             => get_post_meta( $id, '_height', true ),
				'upsell_ids'         => get_post_meta( $id, '_upsell_ids', true ),
				'cross_sell_ids'     => get_post_meta( $id, '_crosssell_ids', true ),
				'purchase_note'      => get_post_meta( $id, '_purchase_note', true ),
				'default_attributes' => get_post_meta( $id, '_default_attributes', true ),
				'category_ids'       => $this->get_term_ids( $product, 'product_cat' ),
				'tag_ids'            => $this->get_term_ids( $product, 'product_tag' ),
				'shipping_class_id'  => current( $this->get_term_ids( $product, 'product_shipping_class' ) ),
				'virtual'            => get_post_meta( $id, '_virtual', true ),
				'downloadable'       => get_post_meta( $id, '_downloadable', true ),
				'gallery_image_ids'  => array_filter( explode( ',', get_post_meta( $id, '_product_image_gallery', true ) ) ),
				'download_limit'     => get_post_meta( $id, '_download_limit', true ),
				'download_expiry'    => get_post_meta( $id, '_download_expiry', true ),
				'image_id'           => get_post_thumbnail_id( $id ),
			)
		);

		// Handle sale dates on the fly in case of missed cron schedule.
		if ( $product->is_type( 'simple' ) && $product->is_on_sale( 'edit' ) && $product->get_sale_price( 'edit' ) !== $product->get_price( 'edit' ) ) {
			update_post_meta( $product->get_id(), '_price', $product->get_sale_price( 'edit' ) );
			$product->set_price( $product->get_sale_price( 'edit' ) );
		}
	}

	/**
	 * Read extra data associated with the product, like button text or product URL for external products.
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function read_extra_data( &$product ) {
		foreach ( $product->get_extra_data_keys() as $key ) {
			$function = 'set_' . $key;
			if ( is_callable( array( $product, $function ) ) ) {
				$product->{$function}( get_post_meta( $product->get_id(), '_' . $key, true ) );
			}
		}
	}

	/**
	 * Convert visibility terms to props.
	 * Catalog visibility valid values are 'visible', 'catalog', 'search', and 'hidden'.
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function read_visibility( &$product ) {
		$terms           = get_the_terms( $product->get_id(), 'product_visibility' );
		$term_names      = is_array( $terms ) ? wp_list_pluck( $terms, 'name' ) : array();
		$featured        = in_array( 'featured', $term_names, true );
		$exclude_search  = in_array( 'exclude-from-search', $term_names, true );
		$exclude_catalog = in_array( 'exclude-from-catalog', $term_names, true );

		if ( $exclude_search && $exclude_catalog ) {
			$catalog_visibility = 'hidden';
		} elseif ( $exclude_search ) {
			$catalog_visibility = 'catalog';
		} elseif ( $exclude_catalog ) {
			$catalog_visibility = 'search';
		} else {
			$catalog_visibility = 'visible';
		}

		$product->set_props(
			array(
				'featured'           => $featured,
				'catalog_visibility' => $catalog_visibility,
			)
		);
	}

	/**
	 * Read attributes from post meta.
	 *
	 * @param WC_Product $product Product object.
	 */
	protected function read_attributes( &$product ) {
		$meta_attributes = get_post_meta( $product->get_id(), '_product_attributes', true );

		if ( ! empty( $meta_attributes ) && is_array( $meta_attributes ) ) {
			$attributes = array();
			foreach ( $meta_attributes as $meta_attribute_key => $meta_attribute_value ) {
				$meta_value = array_merge(
					array(
						'name'         => '',
						'value'        => '',
						'position'     => 0,
						'is_visible'   => 0,
						'is_variation' => 0,
						'is_taxonomy'  => 0,
					), (array) $meta_attribute_value
				);

				// Check if is a taxonomy attribute.
				if ( ! empty( $meta_value['is_taxonomy'] ) ) {
					if ( ! taxonomy_exists( $meta_value['name'] ) ) {
						continue;
					}
					$id      = wc_attribute_taxonomy_id_by_name( $meta_value['name'] );
					$options = wc_get_object_terms( $product->get_id(), $meta_value['name'], 'term_id' );
				} else {
					$id      = 0;
					$options = wc_get_text_attributes( $meta_value['value'] );
				}

				$attribute = new WC_Product_Attribute();
				$attribute->set_id( $id );
				$attribute->set_name( $meta_value['name'] );
				$attribute->set_options( $options );
				$attribute->set_position( $meta_value['position'] );
				$attribute->set_visible( $meta_value['is_visible'] );
				$attribute->set_variation( $meta_value['is_variation'] );
				$attributes[] = $attribute;
			}
			$product->set_attributes( $attributes );
		}
	}

	/**
	 * Read downloads from post meta.
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function read_downloads( &$product ) {
		$meta_values = array_filter( (array) get_post_meta( $product->get_id(), '_downloadable_files', true ) );

		if ( $meta_values ) {
			$downloads = array();
			foreach ( $meta_values as $key => $value ) {
				if ( ! isset( $value['name'], $value['file'] ) ) {
					continue;
				}
				$download = new WC_Product_Download();
				$download->set_id( $key );
				$download->set_name( $value['name'] ? $value['name'] : wc_get_filename_from_url( $value['file'] ) );
				$download->set_file( apply_filters( 'woocommerce_file_download_path', $value['file'], $product, $key ) );
				$downloads[] = $download;
			}
			$product->set_downloads( $downloads );
		}
	}

	/**
	 * Helper method that updates all the post meta for a product based on it's settings in the WC_Product class.
	 *
	 * @param WC_Product $product Product object.
	 * @param bool       $force Force update. Used during create.
	 * @since WC-3.0.0
	 */
	protected function update_post_meta( &$product, $force = false ) {
		$meta_key_to_props = array(
			'_sku'                   => 'sku',
			'_regular_price'         => 'regular_price',
			'_sale_price'            => 'sale_price',
			'_sale_price_dates_from' => 'date_on_sale_from',
			'_sale_price_dates_to'   => 'date_on_sale_to',
			'total_sales'            => 'total_sales',
			'_tax_status'            => 'tax_status',
			'_tax_class'             => 'tax_class',
			'_manage_stock'          => 'manage_stock',
			'_backorders'            => 'backorders',
			'_low_stock_amount'      => 'low_stock_amount',
			'_sold_individually'     => 'sold_individually',
			'_weight'                => 'weight',
			'_length'                => 'length',
			'_width'                 => 'width',
			'_height'                => 'height',
			'_upsell_ids'            => 'upsell_ids',
			'_crosssell_ids'         => 'cross_sell_ids',
			'_purchase_note'         => 'purchase_note',
			'_default_attributes'    => 'default_attributes',
			'_virtual'               => 'virtual',
			'_downloadable'          => 'downloadable',
			'_product_image_gallery' => 'gallery_image_ids',
			'_download_limit'        => 'download_limit',
			'_download_expiry'       => 'download_expiry',
			'_thumbnail_id'          => 'image_id',
			'_stock'                 => 'stock_quantity',
			'_stock_status'          => 'stock_status',
			'_wc_average_rating'     => 'average_rating',
			'_wc_rating_count'       => 'rating_counts',
			'_wc_review_count'       => 'review_count',
		);

		// Make sure to take extra data (like product url or text for external products) into account.
		$extra_data_keys = $product->get_extra_data_keys();

		foreach ( $extra_data_keys as $key ) {
			$meta_key_to_props[ '_' . $key ] = $key;
		}

		$props_to_update = $force ? $meta_key_to_props : $this->get_props_to_update( $product, $meta_key_to_props );

		foreach ( $props_to_update as $meta_key => $prop ) {
			$value = $product->{"get_$prop"}( 'edit' );
			$value = is_string( $value ) ? wp_slash( $value ) : $value;
			switch ( $prop ) {
				case 'virtual':
				case 'downloadable':
				case 'manage_stock':
				case 'sold_individually':
					$updated = update_post_meta( $product->get_id(), $meta_key, wc_bool_to_string( $value ) );
					break;
				case 'gallery_image_ids':
					$updated = update_post_meta( $product->get_id(), $meta_key, implode( ',', $value ) );
					break;
				case 'image_id':
					if ( ! empty( $value ) ) {
						set_post_thumbnail( $product->get_id(), $value );
					} else {
						delete_post_meta( $product->get_id(), '_thumbnail_id' );
					}
					$updated = true;
					break;
				case 'date_on_sale_from':
				case 'date_on_sale_to':
					$updated = update_post_meta( $product->get_id(), $meta_key, $value ? $value->getTimestamp() : '' );
					break;
				default:
					$updated = update_post_meta( $product->get_id(), $meta_key, $value );
					break;
			}
			if ( $updated ) {
				$this->updated_props[] = $prop;
			}
		}

		// Update extra data associated with the product like button text or product URL for external products.
		if ( ! $this->extra_data_saved ) {
			foreach ( $extra_data_keys as $key ) {
				if ( ! array_key_exists( '_' . $key, $props_to_update ) ) {
					continue;
				}
				$function = 'get_' . $key;
				if ( is_callable( array( $product, $function ) ) ) {
					$value = $product->{$function}( 'edit' );
					$value = is_string( $value ) ? wp_slash( $value ) : $value;

					if ( update_post_meta( $product->get_id(), '_' . $key, $value ) ) {
						$this->updated_props[] = $key;
					}
				}
			}
		}

		if ( $this->update_downloads( $product, $force ) ) {
			$this->updated_props[] = 'downloads';
		}
	}

	/**
	 * Handle updated meta props after updating meta data.
	 *
	 * @since WC-3.0.0
	 * @param WC_Product $product Product Object.
	 */
	protected function handle_updated_props( &$product ) {
		$price_is_synced = $product->is_type( array( 'variable', 'grouped' ) );

		if ( ! $price_is_synced ) {
			if ( in_array( 'regular_price', $this->updated_props, true ) || in_array( 'sale_price', $this->updated_props, true ) ) {
				if ( $product->get_sale_price( 'edit' ) >= $product->get_regular_price( 'edit' ) ) {
					update_post_meta( $product->get_id(), '_sale_price', '' );
					$product->set_sale_price( '' );
				}
			}

			if ( in_array( 'date_on_sale_from', $this->updated_props, true ) || in_array( 'date_on_sale_to', $this->updated_props, true ) || in_array( 'regular_price', $this->updated_props, true ) || in_array( 'sale_price', $this->updated_props, true ) || in_array( 'product_type', $this->updated_props, true ) ) {
				if ( $product->is_on_sale( 'edit' ) ) {
					update_post_meta( $product->get_id(), '_price', $product->get_sale_price( 'edit' ) );
					$product->set_price( $product->get_sale_price( 'edit' ) );
				} else {
					update_post_meta( $product->get_id(), '_price', $product->get_regular_price( 'edit' ) );
					$product->set_price( $product->get_regular_price( 'edit' ) );
				}
			}
		}

		if ( in_array( 'stock_quantity', $this->updated_props, true ) ) {
			if ( $product->is_type( 'variation' ) ) {
				do_action( 'woocommerce_variation_set_stock', $product );
			} else {
				do_action( 'woocommerce_product_set_stock', $product );
			}
		}

		if ( in_array( 'stock_status', $this->updated_props, true ) ) {
			if ( $product->is_type( 'variation' ) ) {
				do_action( 'woocommerce_variation_set_stock_status', $product->get_id(), $product->get_stock_status(), $product );
			} else {
				do_action( 'woocommerce_product_set_stock_status', $product->get_id(), $product->get_stock_status(), $product );
			}
		}

		// Trigger action so 3rd parties can deal with updated props.
		do_action( 'woocommerce_product_object_updated_props', $product, $this->updated_props );

		// After handling, we can reset the props array.
		$this->updated_props = array();
	}

	/**
	 * For all stored terms in all taxonomies, save them to the DB.
	 *
	 * @param WC_Product $product Product object.
	 * @param bool       $force Force update. Used during create.
	 * @since WC-3.0.0
	 */
	protected function update_terms( &$product, $force = false ) {
		$changes = $product->get_changes();

		if ( $force || array_key_exists( 'category_ids', $changes ) ) {
			$categories = $product->get_category_ids( 'edit' );

			if ( empty( $categories ) && get_option( 'default_product_cat', 0 ) ) {
				$categories = array( get_option( 'default_product_cat', 0 ) );
			}

			wp_set_post_terms( $product->get_id(), $categories, 'product_cat', false );
		}
		if ( $force || array_key_exists( 'tag_ids', $changes ) ) {
			wp_set_post_terms( $product->get_id(), $product->get_tag_ids( 'edit' ), 'product_tag', false );
		}
		if ( $force || array_key_exists( 'shipping_class_id', $changes ) ) {
			wp_set_post_terms( $product->get_id(), array( $product->get_shipping_class_id( 'edit' ) ), 'product_shipping_class', false );
		}
	}

	/**
	 * Update visibility terms based on props.
	 *
	 * @since WC-3.0.0
	 *
	 * @param WC_Product $product Product object.
	 * @param bool       $force Force update. Used during create.
	 */
	protected function update_visibility( &$product, $force = false ) {
		$changes = $product->get_changes();

		if ( $force || array_intersect( array( 'featured', 'stock_status', 'average_rating', 'catalog_visibility' ), array_keys( $changes ) ) ) {
			$terms = array();

			if ( $product->get_featured() ) {
				$terms[] = 'featured';
			}

			if ( 'outofstock' === $product->get_stock_status() ) {
				$terms[] = 'outofstock';
			}

			$rating = min( 5, round( $product->get_average_rating(), 0 ) );

			if ( $rating > 0 ) {
				$terms[] = 'rated-' . $rating;
			}

			switch ( $product->get_catalog_visibility() ) {
				case 'hidden':
					$terms[] = 'exclude-from-search';
					$terms[] = 'exclude-from-catalog';
					break;
				case 'catalog':
					$terms[] = 'exclude-from-search';
					break;
				case 'search':
					$terms[] = 'exclude-from-catalog';
					break;
			}

			if ( ! is_wp_error( wp_set_post_terms( $product->get_id(), $terms, 'product_visibility', false ) ) ) {
				delete_transient( 'wc_featured_products' );
				do_action( 'woocommerce_product_set_visibility', $product->get_id(), $product->get_catalog_visibility() );
			}
		}
	}

	/**
	 * Update attributes which are a mix of terms and meta data.
	 *
	 * @param WC_Product $product Product object.
	 * @param bool       $force Force update. Used during create.
	 * @since WC-3.0.0
	 */
	protected function update_attributes( &$product, $force = false ) {
		$changes = $product->get_changes();

		if ( $force || array_key_exists( 'attributes', $changes ) ) {
			$attributes  = $product->get_attributes();
			$meta_values = array();

			if ( $attributes ) {
				foreach ( $attributes as $attribute_key => $attribute ) {
					$value = '';

					delete_transient( 'wc_layered_nav_counts_' . $attribute_key );

					if ( is_null( $attribute ) ) {
						if ( taxonomy_exists( $attribute_key ) ) {
							// Handle attributes that have been unset.
							wp_set_object_terms( $product->get_id(), array(), $attribute_key );
						}
						continue;

					} elseif ( $attribute->is_taxonomy() ) {
						wp_set_object_terms( $product->get_id(), wp_list_pluck( (array) $attribute->get_terms(), 'term_id' ), $attribute->get_name() );
					} else {
						$value = wc_implode_text_attributes( $attribute->get_options() );
					}

					// Store in format WC uses in meta.
					$meta_values[ $attribute_key ] = array(
						'name'         => $attribute->get_name(),
						'value'        => $value,
						'position'     => $attribute->get_position(),
						'is_visible'   => $attribute->get_visible() ? 1 : 0,
						'is_variation' => $attribute->get_variation() ? 1 : 0,
						'is_taxonomy'  => $attribute->is_taxonomy() ? 1 : 0,
					);
				}
			}
			update_post_meta( $product->get_id(), '_product_attributes', $meta_values );
		}
	}

	/**
	 * Update downloads.
	 *
	 * @since WC-3.0.0
	 * @param WC_Product $product Product object.
	 * @param bool       $force Force update. Used during create.
	 * @return bool If updated or not.
	 */
	protected function update_downloads( &$product, $force = false ) {
		$changes = $product->get_changes();

		if ( $force || array_key_exists( 'downloads', $changes ) ) {
			$downloads   = $product->get_downloads();
			$meta_values = array();

			if ( $downloads ) {
				foreach ( $downloads as $key => $download ) {
					// Store in format WC uses in meta.
					$meta_values[ $key ] = $download->get_data();
				}
			}

			if ( $product->is_type( 'variation' ) ) {
				do_action( 'woocommerce_process_product_file_download_paths', $product->get_parent_id(), $product->get_id(), $downloads );
			} else {
				do_action( 'woocommerce_process_product_file_download_paths', $product->get_id(), 0, $downloads );
			}

			return update_post_meta( $product->get_id(), '_downloadable_files', $meta_values );
		}
		return false;
	}

	/**
	 * Make sure we store the product type and version (to track data changes).
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function update_version_and_type( &$product ) {
		$old_type = WC_Product_Factory::get_product_type( $product->get_id() );
		$new_type = $product->get_type();

		wp_set_object_terms( $product->get_id(), $new_type, 'product_type' );
		update_post_meta( $product->get_id(), '_product_version', WC_VERSION );

		// Action for the transition.
		if ( $old_type !== $new_type ) {
			$this->updated_props[] = 'product_type';
			do_action( 'woocommerce_product_type_changed', $product, $old_type, $new_type );
		}
	}

	/**
	 * Clear any caches.
	 *
	 * @param WC_Product $product Product object.
	 * @since WC-3.0.0
	 */
	protected function clear_caches( &$product ) {
		wc_delete_product_transients( $product->get_id() );
		WC_Cache_Helper::incr_cache_prefix( 'product_' . $product->get_id() );
	}

	/*
	|--------------------------------------------------------------------------
	| wc-product-functions.php methods
	|--------------------------------------------------------------------------
	*/

	/**
	 * Returns an array of on sale products, as an array of objects with an
	 * ID and parent_id present. Example: $return[0]->id, $return[0]->parent_id.
	 *
	 * @return array
	 * @since WC-3.0.0
	 */
	public function get_on_sale_products() {
		global $wpdb;

		$decimals                    = absint( wc_get_price_decimals() );
		$exclude_term_ids            = array();
		$outofstock_join             = '';
		$outofstock_where            = '';
		$non_published_where         = '';
		$product_visibility_term_ids = wc_get_product_visibility_term_ids();

		if ( 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) && $product_visibility_term_ids['outofstock'] ) {
			$exclude_term_ids[] = $product_visibility_term_ids['outofstock'];
		}

		if ( count( $exclude_term_ids ) ) {
			$outofstock_join  = " LEFT JOIN ( SELECT object_id FROM {$wpdb->term_relationships} WHERE term_taxonomy_id IN ( " . implode( ',', array_map( 'absint', $exclude_term_ids ) ) . ' ) ) AS exclude_join ON exclude_join.object_id = id';
			$outofstock_where = ' AND exclude_join.object_id IS NULL';
		}

		// Fetch a list of non-published parent products and exlude them, quicker than joining in the main query below.
		$non_published_products = $wpdb->get_col(
			"SELECT post.ID as id FROM `$wpdb->posts` AS post
			WHERE post.post_type = 'product'
			AND post.post_parent = 0
			AND post.post_status != 'publish'"
		);
		if ( 0 < count( $non_published_products ) ) {
			$non_published_where = ' AND post.post_parent NOT IN ( ' . implode( ',', $non_published_products ) . ')';
		}

		return $wpdb->get_results(
			// phpcs:disable WordPress.WP.PreparedSQL.NotPrepared
			$wpdb->prepare(
				"SELECT post.ID as id, post.post_parent as parent_id FROM `$wpdb->posts` AS post
				LEFT JOIN `$wpdb->postmeta` AS meta ON post.ID = meta.post_id
				LEFT JOIN `$wpdb->postmeta` AS meta2 ON post.ID = meta2.post_id
				$outofstock_join
				WHERE post.post_type IN ( 'product', 'product_variation' )
					AND post.post_status = 'publish'
					AND meta.meta_key = '_sale_price'
					AND meta2.meta_key = '_price'
					AND CAST( meta.meta_value AS DECIMAL ) >= 0
					AND CAST( meta.meta_value AS CHAR ) != ''
					AND CAST( meta.meta_value AS DECIMAL( 10, %d ) ) = CAST( meta2.meta_value AS DECIMAL( 10, %d ) )
					$outofstock_where
					$non_published_where
				GROUP BY post.ID",
				$decimals,
				$decimals
			)
			// phpcs:enable
		);
	}

	/**
	 * Returns a list of product IDs ( id as key => parent as value) that are
	 * featured. Uses get_posts instead of wc_get_products since we want
	 * some extra meta queries and ALL products (posts_per_page = -1).
	 *
	 * @return array
	 * @since WC-3.0.0
	 */
	public function get_featured_product_ids() {
		$product_visibility_term_ids = wc_get_product_visibility_term_ids();

		return get_posts(
			array(
				'post_type'      => array( 'product', 'product_variation' ),
				'posts_per_page' => -1,
				'post_status'    => 'publish',
				// phpcs:ignore WordPress.VIP.SlowDBQuery.slow_db_query_tax_query
				'tax_query'      => array(
					'relation' => 'AND',
					array(
						'taxonomy' => 'product_visibility',
						'field'    => 'term_taxonomy_id',
						'terms'    => array( $product_visibility_term_ids['featured'] ),
					),
					array(
						'taxonomy' => 'product_visibility',
						'field'    => 'term_taxonomy_id',
						'terms'    => array( $product_visibility_term_ids['exclude-from-catalog'] ),
						'operator' => 'NOT IN',
					),
				),
				'fields'         => 'id=>parent',
			)
		);
	}

	/**
	 * Check if product sku is found for any other product IDs.
	 *
	 * @since WC-3.0.0
	 * @param int    $product_id Product ID.
	 * @param string $sku Will be slashed to work around https://core.trac.wordpress.org/ticket/27421.
	 * @return bool
	 */
	public function is_existing_sku( $product_id, $sku ) {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		return $wpdb->get_var(
			$wpdb->prepare(
				"SELECT $wpdb->posts.ID
				FROM $wpdb->posts
				LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )
				WHERE $wpdb->posts.post_type IN ( 'product', 'product_variation' )
					AND $wpdb->posts.post_status != 'trash'
					AND $wpdb->postmeta.meta_key = '_sku' AND $wpdb->postmeta.meta_value = %s
					AND $wpdb->postmeta.post_id <> %d
				LIMIT 1",
				wp_slash( $sku ), $product_id
			)
		);
	}

	/**
	 * Return product ID based on SKU.
	 *
	 * @since WC-3.0.0
	 * @param string $sku Product SKU.
	 * @return int
	 */
	public function get_product_id_by_sku( $sku ) {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		$id = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT posts.ID
				FROM $wpdb->posts AS posts
				LEFT JOIN $wpdb->postmeta AS postmeta ON ( posts.ID = postmeta.post_id )
				WHERE posts.post_type IN ( 'product', 'product_variation' )
					AND posts.post_status != 'trash'
					AND postmeta.meta_key = '_sku'
					AND postmeta.meta_value = %s
				LIMIT 1",
				$sku
			)
		);

		return (int) apply_filters( 'woocommerce_get_product_id_by_sku', $id, $sku );
	}

	/**
	 * Returns an array of IDs of products that have sales starting soon.
	 *
	 * @since WC-3.0.0
	 * @return array
	 */
	public function get_starting_sales() {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		return $wpdb->get_col(
			$wpdb->prepare(
				"SELECT postmeta.post_id FROM {$wpdb->postmeta} as postmeta
				LEFT JOIN {$wpdb->postmeta} as postmeta_2 ON postmeta.post_id = postmeta_2.post_id
				LEFT JOIN {$wpdb->postmeta} as postmeta_3 ON postmeta.post_id = postmeta_3.post_id
				WHERE postmeta.meta_key = '_sale_price_dates_from'
					AND postmeta_2.meta_key = '_price'
					AND postmeta_3.meta_key = '_sale_price'
					AND postmeta.meta_value > 0
					AND postmeta.meta_value < %s
					AND postmeta_2.meta_value != postmeta_3.meta_value",
				current_time( 'timestamp', true )
			)
		);
	}

	/**
	 * Returns an array of IDs of products that have sales which are due to end.
	 *
	 * @since WC-3.0.0
	 * @return array
	 */
	public function get_ending_sales() {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		return $wpdb->get_col(
			$wpdb->prepare(
				"SELECT postmeta.post_id FROM {$wpdb->postmeta} as postmeta
				LEFT JOIN {$wpdb->postmeta} as postmeta_2 ON postmeta.post_id = postmeta_2.post_id
				LEFT JOIN {$wpdb->postmeta} as postmeta_3 ON postmeta.post_id = postmeta_3.post_id
				WHERE postmeta.meta_key = '_sale_price_dates_to'
					AND postmeta_2.meta_key = '_price'
					AND postmeta_3.meta_key = '_regular_price'
					AND postmeta.meta_value > 0
					AND postmeta.meta_value < %s
					AND postmeta_2.meta_value != postmeta_3.meta_value",
				current_time( 'timestamp', true )
			)
		);
	}

	/**
	 * Find a matching (enabled) variation within a variable product.
	 *
	 * @since  WC-3.0.0
	 * @param  WC_Product $product Variable product.
	 * @param  array      $match_attributes Array of attributes we want to try to match.
	 * @return int Matching variation ID or 0.
	 */
	public function find_matching_product_variation( $product, $match_attributes = array() ) {
		$query_args = array(
			'post_parent' => $product->get_id(),
			'post_type'   => 'product_variation',
			'orderby'     => 'menu_order',
			'order'       => 'ASC',
			'fields'      => 'ids',
			'post_status' => 'publish',
			'numberposts' => 1,
			'meta_query'  => array(), // phpcs:ignore WordPress.VIP.SlowDBQuery.slow_db_query_meta_query
		);

		// Allow large queries in case user has many variations or attributes.
		$GLOBALS['wpdb']->query( 'SET SESSION SQL_BIG_SELECTS=1' );

		foreach ( $product->get_attributes() as $attribute ) {
			if ( ! $attribute->get_variation() ) {
				continue;
			}

			$attribute_field_name = 'attribute_' . sanitize_title( $attribute->get_name() );

			if ( ! isset( $match_attributes[ $attribute_field_name ] ) ) {
				return 0;
			}

			// Note not wc_clean here to prevent removal of entities.
			$value = $match_attributes[ $attribute_field_name ];

			$query_args['meta_query'][] = array(
				'relation' => 'OR',
				array(
					'key'     => $attribute_field_name,
					'value'   => array( '', $value ),
					'compare' => 'IN',
				),
				array(
					'key'     => $attribute_field_name,
					'compare' => 'NOT EXISTS',
				),
			);
		}

		$variations = get_posts( $query_args );

		if ( $variations && ! is_wp_error( $variations ) ) {
			return current( $variations );
		} elseif ( version_compare( get_post_meta( $product->get_id(), '_product_version', true ), '2.4.0', '<' ) ) {
			/**
			 * Pre 2.4 handling where 'slugs' were saved instead of the full text attribute.
			 * Fallback is here because there are cases where data will be 'synced' but the product version will remain the same.
			 */
			return ( array_map( 'sanitize_title', $match_attributes ) === $match_attributes ) ? 0 : $this->find_matching_product_variation( $product, array_map( 'sanitize_title', $match_attributes ) );
		}

		return 0;
	}

	/**
	 * Make sure all variations have a sort order set so they can be reordered correctly.
	 *
	 * @param int $parent_id Product ID.
	 */
	public function sort_all_product_variations( $parent_id ) {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		$ids   = $wpdb->get_col(
			$wpdb->prepare(
				"SELECT ID FROM {$wpdb->posts} WHERE post_type = 'product_variation' AND post_parent = %d AND post_status = 'publish' ORDER BY menu_order ASC, ID ASC",
				$parent_id
			)
		);
		$index = 1;

		foreach ( $ids as $id ) {
			// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
			$wpdb->update( $wpdb->posts, array( 'menu_order' => ( $index++ ) ), array( 'ID' => absint( $id ) ) );
		}
	}

	/**
	 * Return a list of related products (using data like categories and IDs).
	 *
	 * @since WC-3.0.0
	 * @param array $cats_array  List of categories IDs.
	 * @param array $tags_array  List of tags IDs.
	 * @param array $exclude_ids Excluded IDs.
	 * @param int   $limit       Limit of results.
	 * @param int   $product_id  Product ID.
	 * @return array
	 */
	public function get_related_products( $cats_array, $tags_array, $exclude_ids, $limit, $product_id ) {
		global $wpdb;

		$args = array(
			'categories'  => $cats_array,
			'tags'        => $tags_array,
			'exclude_ids' => $exclude_ids,
			'limit'       => $limit + 10,
		);

		$related_product_query = (array) apply_filters( 'woocommerce_product_related_posts_query', $this->get_related_products_query( $cats_array, $tags_array, $exclude_ids, $limit + 10 ), $product_id, $args );

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery, WordPress.WP.PreparedSQL.NotPrepared
		return $wpdb->get_col( implode( ' ', $related_product_query ) );
	}

	/**
	 * Builds the related posts query.
	 *
	 * @since WC-3.0.0
	 *
	 * @param array $cats_array  List of categories IDs.
	 * @param array $tags_array  List of tags IDs.
	 * @param array $exclude_ids Excluded IDs.
	 * @param int   $limit       Limit of results.
	 *
	 * @return array
	 */
	public function get_related_products_query( $cats_array, $tags_array, $exclude_ids, $limit ) {
		global $wpdb;

		$include_term_ids            = array_merge( $cats_array, $tags_array );
		$exclude_term_ids            = array();
		$product_visibility_term_ids = wc_get_product_visibility_term_ids();

		if ( $product_visibility_term_ids['exclude-from-catalog'] ) {
			$exclude_term_ids[] = $product_visibility_term_ids['exclude-from-catalog'];
		}

		if ( 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) && $product_visibility_term_ids['outofstock'] ) {
			$exclude_term_ids[] = $product_visibility_term_ids['outofstock'];
		}

		$query = array(
			'fields' => "
				SELECT DISTINCT ID FROM {$wpdb->posts} p
			",
			'join'   => '',
			'where'  => "
				WHERE 1=1
				AND p.post_status = 'publish'
				AND p.post_type = 'product'

			",
			'limits' => '
				LIMIT ' . absint( $limit ) . '
			',
		);

		if ( count( $exclude_term_ids ) ) {
			$query['join']  .= " LEFT JOIN ( SELECT object_id FROM {$wpdb->term_relationships} WHERE term_taxonomy_id IN ( " . implode( ',', array_map( 'absint', $exclude_term_ids ) ) . ' ) ) AS exclude_join ON exclude_join.object_id = p.ID';
			$query['where'] .= ' AND exclude_join.object_id IS NULL';
		}

		if ( count( $include_term_ids ) ) {
			$query['join'] .= " INNER JOIN ( SELECT object_id FROM {$wpdb->term_relationships} INNER JOIN {$wpdb->term_taxonomy} using( term_taxonomy_id ) WHERE term_id IN ( " . implode( ',', array_map( 'absint', $include_term_ids ) ) . ' ) ) AS include_join ON include_join.object_id = p.ID';
		}

		if ( count( $exclude_ids ) ) {
			$query['where'] .= ' AND p.ID NOT IN ( ' . implode( ',', array_map( 'absint', $exclude_ids ) ) . ' )';
		}

		return $query;
	}

	/**
	 * Update a product's stock amount directly.
	 *
	 * Uses queries rather than update_post_meta so we can do this in one query (to avoid stock issues).
	 *
	 * @since  WC-3.0.0 this supports set, increase and decrease.
	 * @param  int      $product_id_with_stock Product ID.
	 * @param  int|null $stock_quantity Stock quantity.
	 * @param  string   $operation Set, increase and decrease.
	 */
	public function update_product_stock( $product_id_with_stock, $stock_quantity = null, $operation = 'set' ) {
		global $wpdb;
		add_post_meta( $product_id_with_stock, '_stock', 0, true );

		// Update stock in DB directly.
		switch ( $operation ) {
			case 'increase':
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = meta_value + %f WHERE post_id = %d AND meta_key='_stock'", $stock_quantity, $product_id_with_stock
					)
				);
				break;
			case 'decrease':
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = meta_value - %f WHERE post_id = %d AND meta_key='_stock'", $stock_quantity, $product_id_with_stock
					)
				);
				break;
			default:
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = %f WHERE post_id = %d AND meta_key='_stock'", $stock_quantity, $product_id_with_stock
					)
				);
				break;
		}

		wp_cache_delete( $product_id_with_stock, 'post_meta' );
	}

	/**
	 * Update a product's sale count directly.
	 *
	 * Uses queries rather than update_post_meta so we can do this in one query for performance.
	 *
	 * @since  WC-3.0.0 this supports set, increase and decrease.
	 * @param  int      $product_id Product ID.
	 * @param  int|null $quantity Quantity.
	 * @param  string   $operation set, increase and decrease.
	 */
	public function update_product_sales( $product_id, $quantity = null, $operation = 'set' ) {
		global $wpdb;
		add_post_meta( $product_id, 'total_sales', 0, true );

		// Update stock in DB directly.
		switch ( $operation ) {
			case 'increase':
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = meta_value + %f WHERE post_id = %d AND meta_key='total_sales'", $quantity, $product_id
					)
				);
				break;
			case 'decrease':
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = meta_value - %f WHERE post_id = %d AND meta_key='total_sales'", $quantity, $product_id
					)
				);
				break;
			default:
				// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
				$wpdb->query(
					$wpdb->prepare(
						"UPDATE {$wpdb->postmeta} SET meta_value = %f WHERE post_id = %d AND meta_key='total_sales'", $quantity, $product_id
					)
				);
				break;
		}

		wp_cache_delete( $product_id, 'post_meta' );
	}

	/**
	 * Update a products average rating meta.
	 *
	 * @since WC-3.0.0
	 * @param WC_Product $product Product object.
	 */
	public function update_average_rating( $product ) {
		update_post_meta( $product->get_id(), '_wc_average_rating', $product->get_average_rating( 'edit' ) );
		self::update_visibility( $product, true );
	}

	/**
	 * Update a products review count meta.
	 *
	 * @since WC-3.0.0
	 * @param WC_Product $product Product object.
	 */
	public function update_review_count( $product ) {
		update_post_meta( $product->get_id(), '_wc_review_count', $product->get_review_count( 'edit' ) );
	}

	/**
	 * Update a products rating counts.
	 *
	 * @since WC-3.0.0
	 * @param WC_Product $product Product object.
	 */
	public function update_rating_counts( $product ) {
		update_post_meta( $product->get_id(), '_wc_rating_count', $product->get_rating_counts( 'edit' ) );
	}

	/**
	 * Get shipping class ID by slug.
	 *
	 * @since WC-3.0.0
	 * @param string $slug Product shipping class slug.
	 * @return int|false
	 */
	public function get_shipping_class_id_by_slug( $slug ) {
		$shipping_class_term = get_term_by( 'slug', $slug, 'product_shipping_class' );
		if ( $shipping_class_term ) {
			return $shipping_class_term->term_id;
		} else {
			return false;
		}
	}

	/**
	 * Returns an array of products.
	 *
	 * @param  array $args Args to pass to WC_Product_Query().
	 * @return array|object
	 * @see wc_get_products
	 */
	public function get_products( $args = array() ) {
		$query = new WC_Product_Query( $args );
		return $query->get_products();
	}

	/**
	 * Search product data for a term and return ids.
	 *
	 * @param  string   $term Search term.
	 * @param  string   $type Type of product.
	 * @param  bool     $include_variations Include variations in search or not.
	 * @param  bool     $all_statuses Should we search all statuses or limit to published.
	 * @param  null|int $limit Limit returned results. @since WC-3.5.0.
	 * @return array of ids
	 */
	public function search_products( $term, $type = '', $include_variations = false, $all_statuses = false, $limit = null ) {
		global $wpdb;

		$post_types    = $include_variations ? array( 'product', 'product_variation' ) : array( 'product' );
		$post_statuses = current_user_can( 'edit_private_products' ) ? array( 'private', 'publish' ) : array( 'publish' );
		$type_join     = '';
		$type_where    = '';
		$status_where  = '';
		$limit_query   = '';
		$term          = wc_strtolower( $term );

		// See if search term contains OR keywords.
		if ( strstr( $term, ' or ' ) ) {
			$term_groups = explode( ' or ', $term );
		} else {
			$term_groups = array( $term );
		}

		$search_where   = '';
		$search_queries = array();

		foreach ( $term_groups as $term_group ) {
			// Parse search terms.
			if ( preg_match_all( '/".*?("|$)|((?<=[\t ",+])|^)[^\t ",+]+/', $term_group, $matches ) ) {
				$search_terms = $this->get_valid_search_terms( $matches[0] );
				$count        = count( $search_terms );

				// if the search string has only short terms or stopwords, or is 10+ terms long, match it as sentence.
				if ( 9 < $count || 0 === $count ) {
					$search_terms = array( $term_group );
				}
			} else {
				$search_terms = array( $term_group );
			}

			$term_group_query = '';
			$searchand        = '';

			foreach ( $search_terms as $search_term ) {
				$like              = '%' . $wpdb->esc_like( $search_term ) . '%';
				$term_group_query .= $wpdb->prepare( " {$searchand} ( ( posts.post_title LIKE %s) OR ( posts.post_excerpt LIKE %s) OR ( posts.post_content LIKE %s ) OR ( postmeta.meta_key = '_sku' AND postmeta.meta_value LIKE %s ) )", $like, $like, $like, $like ); // @codingStandardsIgnoreLine.
				$searchand         = ' AND ';
			}

			if ( $term_group_query ) {
				$search_queries[] = $term_group_query;
			}
		}

		if ( ! empty( $search_queries ) ) {
			$search_where = 'AND (' . implode( ') OR (', $search_queries ) . ')';
		}

		if ( $type && in_array( $type, array( 'virtual', 'downloadable' ), true ) ) {
			$type_join  = " LEFT JOIN {$wpdb->postmeta} postmeta_type ON posts.ID = postmeta_type.post_id ";
			$type_where = " AND ( postmeta_type.meta_key = '_{$type}' AND postmeta_type.meta_value = 'yes' ) ";
		}

		if ( ! $all_statuses ) {
			$status_where = " AND posts.post_status IN ('" . implode( "','", $post_statuses ) . "') ";
		}

		if ( $limit ) {
			$limit_query = $wpdb->prepare( ' LIMIT %d ', $limit );
		}

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		$search_results = $wpdb->get_results(
			// phpcs:disable
			"SELECT DISTINCT posts.ID as product_id, posts.post_parent as parent_id FROM {$wpdb->posts} posts
			LEFT JOIN {$wpdb->postmeta} postmeta ON posts.ID = postmeta.post_id
			$type_join
			WHERE posts.post_type IN ('" . implode( "','", $post_types ) . "')
			$search_where
			$status_where
			$type_where
			ORDER BY posts.post_parent ASC, posts.post_title ASC
			$limit_query
			"
			// phpcs:enable
		);

		$product_ids = wp_parse_id_list( array_merge( wp_list_pluck( $search_results, 'product_id' ), wp_list_pluck( $search_results, 'parent_id' ) ) );

		if ( is_numeric( $term ) ) {
			$post_id   = absint( $term );
			$post_type = get_post_type( $post_id );

			if ( 'product_variation' === $post_type && $include_variations ) {
				$product_ids[] = $post_id;
			} elseif ( 'product' === $post_type ) {
				$product_ids[] = $post_id;
			}

			$product_ids[] = wp_get_post_parent_id( $post_id );
		}

		return wp_parse_id_list( $product_ids );
	}

	/**
	 * Get the product type based on product ID.
	 *
	 * @since WC-3.0.0
	 * @param int $product_id Product ID.
	 * @return bool|string
	 */
	public function get_product_type( $product_id ) {
		$post_type = get_post_type( $product_id );
		if ( 'product_variation' === $post_type ) {
			return 'variation';
		} elseif ( 'product' === $post_type ) {
			$terms = get_the_terms( $product_id, 'product_type' );
			return ! empty( $terms ) ? sanitize_title( current( $terms )->name ) : 'simple';
		} else {
			return false;
		}
	}

	/**
	 * Add ability to get products by 'reviews_allowed' in WC_Product_Query.
	 *
	 * @since WC-3.2.0
	 * @param string   $where Where clause.
	 * @param WP_Query $wp_query WP_Query instance.
	 * @return string
	 */
	public function reviews_allowed_query_where( $where, $wp_query ) {
		global $wpdb;

		if ( isset( $wp_query->query_vars['reviews_allowed'] ) && is_bool( $wp_query->query_vars['reviews_allowed'] ) ) {
			if ( $wp_query->query_vars['reviews_allowed'] ) {
				$where .= " AND $wpdb->posts.comment_status = 'open'";
			} else {
				$where .= " AND $wpdb->posts.comment_status = 'closed'";
			}
		}

		return $where;
	}

	/**
	 * Get valid WP_Query args from a WC_Product_Query's query variables.
	 *
	 * @since WC-3.2.0
	 * @param array $query_vars Query vars from a WC_Product_Query.
	 * @return array
	 */
	protected function get_wp_query_args( $query_vars ) {

		// Map query vars to ones that get_wp_query_args or WP_Query recognize.
		$key_mapping = array(
			'status'         => 'post_status',
			'page'           => 'paged',
			'include'        => 'post__in',
			'stock_quantity' => 'stock',
			'average_rating' => 'wc_average_rating',
			'review_count'   => 'wc_review_count',
		);
		foreach ( $key_mapping as $query_key => $db_key ) {
			if ( isset( $query_vars[ $query_key ] ) ) {
				$query_vars[ $db_key ] = $query_vars[ $query_key ];
				unset( $query_vars[ $query_key ] );
			}
		}

		// Map boolean queries that are stored as 'yes'/'no' in the DB to 'yes' or 'no'.
		$boolean_queries = array(
			'virtual',
			'downloadable',
			'sold_individually',
			'manage_stock',
		);
		foreach ( $boolean_queries as $boolean_query ) {
			if ( isset( $query_vars[ $boolean_query ] ) && '' !== $query_vars[ $boolean_query ] ) {
				$query_vars[ $boolean_query ] = $query_vars[ $boolean_query ] ? 'yes' : 'no';
			}
		}

		// These queries cannot be auto-generated so we have to remove them and build them manually.
		$manual_queries = array(
			'sku'        => '',
			'featured'   => '',
			'visibility' => '',
		);
		foreach ( $manual_queries as $key => $manual_query ) {
			if ( isset( $query_vars[ $key ] ) ) {
				$manual_queries[ $key ] = $query_vars[ $key ];
				unset( $query_vars[ $key ] );
			}
		}

		$wp_query_args = parent::get_wp_query_args( $query_vars );

		if ( ! isset( $wp_query_args['date_query'] ) ) {
			$wp_query_args['date_query'] = array();
		}
		if ( ! isset( $wp_query_args['meta_query'] ) ) {
			// phpcs:ignore WordPress.VIP.SlowDBQuery.slow_db_query_meta_query
			$wp_query_args['meta_query'] = array();
		}

		// Handle product types.
		if ( 'variation' === $query_vars['type'] ) {
			$wp_query_args['post_type'] = 'product_variation';
		} elseif ( is_array( $query_vars['type'] ) && in_array( 'variation', $query_vars['type'], true ) ) {
			$wp_query_args['post_type']   = array( 'product_variation', 'product' );
			$wp_query_args['tax_query'][] = array(
				'relation' => 'OR',
				array(
					'taxonomy' => 'product_type',
					'field'    => 'slug',
					'terms'    => $query_vars['type'],
				),
				array(
					'taxonomy' => 'product_type',
					'field'    => 'id',
					'operator' => 'NOT EXISTS',
				),
			);
		} else {
			$wp_query_args['post_type']   = 'product';
			$wp_query_args['tax_query'][] = array(
				'taxonomy' => 'product_type',
				'field'    => 'slug',
				'terms'    => $query_vars['type'],
			);
		}

		// Handle product categories.
		if ( ! empty( $query_vars['category'] ) ) {
			$wp_query_args['tax_query'][] = array(
				'taxonomy' => 'product_cat',
				'field'    => 'slug',
				'terms'    => $query_vars['category'],
			);
		}

		// Handle product tags.
		if ( ! empty( $query_vars['tag'] ) ) {
			unset( $wp_query_args['tag'] );
			$wp_query_args['tax_query'][] = array(
				'taxonomy' => 'product_tag',
				'field'    => 'slug',
				'terms'    => $query_vars['tag'],
			);
		}

		// Handle shipping classes.
		if ( ! empty( $query_vars['shipping_class'] ) ) {
			$wp_query_args['tax_query'][] = array(
				'taxonomy' => 'product_shipping_class',
				'field'    => 'slug',
				'terms'    => $query_vars['shipping_class'],
			);
		}

		// Handle total_sales.
		// This query doesn't get auto-generated since the meta key doesn't have the underscore prefix.
		if ( isset( $query_vars['total_sales'] ) && '' !== $query_vars['total_sales'] ) {
			$wp_query_args['meta_query'][] = array(
				'key'     => 'total_sales',
				'value'   => absint( $query_vars['total_sales'] ),
				'compare' => '=',
			);
		}

		// Handle SKU.
		if ( $manual_queries['sku'] ) {
			// Check for existing values if wildcard is used.
			if ( '*' === $manual_queries['sku'] ) {
				$wp_query_args['meta_query'][] = array(
					array(
						'key'     => '_sku',
						'compare' => 'EXISTS',
					),
					array(
						'key'     => '_sku',
						'value'   => '',
						'compare' => '!=',
					),
				);
			} else {
				$wp_query_args['meta_query'][] = array(
					'key'     => '_sku',
					'value'   => $manual_queries['sku'],
					'compare' => 'LIKE',
				);
			}
		}

		// Handle featured.
		if ( '' !== $manual_queries['featured'] ) {
			$product_visibility_term_ids = wc_get_product_visibility_term_ids();
			if ( $manual_queries['featured'] ) {
				$wp_query_args['tax_query'][] = array(
					'taxonomy' => 'product_visibility',
					'field'    => 'term_taxonomy_id',
					'terms'    => array( $product_visibility_term_ids['featured'] ),
				);
				$wp_query_args['tax_query'][] = array(
					'taxonomy' => 'product_visibility',
					'field'    => 'term_taxonomy_id',
					'terms'    => array( $product_visibility_term_ids['exclude-from-catalog'] ),
					'operator' => 'NOT IN',
				);
			} else {
				$wp_query_args['tax_query'][] = array(
					'taxonomy' => 'product_visibility',
					'field'    => 'term_taxonomy_id',
					'terms'    => array( $product_visibility_term_ids['featured'] ),
					'operator' => 'NOT IN',
				);
			}
		}

		// Handle visibility.
		if ( $manual_queries['visibility'] ) {
			switch ( $manual_queries['visibility'] ) {
				case 'search':
					$wp_query_args['tax_query'][] = array(
						'taxonomy' => 'product_visibility',
						'field'    => 'slug',
						'terms'    => array( 'exclude-from-search' ),
						'operator' => 'NOT IN',
					);
					break;
				case 'catalog':
					$wp_query_args['tax_query'][] = array(
						'taxonomy' => 'product_visibility',
						'field'    => 'slug',
						'terms'    => array( 'exclude-from-catalog' ),
						'operator' => 'NOT IN',
					);
					break;
				case 'visible':
					$wp_query_args['tax_query'][] = array(
						'taxonomy' => 'product_visibility',
						'field'    => 'slug',
						'terms'    => array( 'exclude-from-catalog', 'exclude-from-search' ),
						'operator' => 'NOT IN',
					);
					break;
				case 'hidden':
					$wp_query_args['tax_query'][] = array(
						'taxonomy' => 'product_visibility',
						'field'    => 'slug',
						'terms'    => array( 'exclude-from-catalog', 'exclude-from-search' ),
						'operator' => 'AND',
					);
					break;
			}
		}

		// Handle date queries.
		$date_queries = array(
			'date_created'      => 'post_date',
			'date_modified'     => 'post_modified',
			'date_on_sale_from' => '_sale_price_dates_from',
			'date_on_sale_to'   => '_sale_price_dates_to',
		);
		foreach ( $date_queries as $query_var_key => $db_key ) {
			if ( isset( $query_vars[ $query_var_key ] ) && '' !== $query_vars[ $query_var_key ] ) {

				// Remove any existing meta queries for the same keys to prevent conflicts.
				$existing_queries = wp_list_pluck( $wp_query_args['meta_query'], 'key', true );
				foreach ( $existing_queries as $query_index => $query_contents ) {
					unset( $wp_query_args['meta_query'][ $query_index ] );
				}

				$wp_query_args = $this->parse_date_for_wp_query( $query_vars[ $query_var_key ], $db_key, $wp_query_args );
			}
		}

		// Handle paginate.
		if ( ! isset( $query_vars['paginate'] ) || ! $query_vars['paginate'] ) {
			$wp_query_args['no_found_rows'] = true;
		}

		// Handle reviews_allowed.
		if ( isset( $query_vars['reviews_allowed'] ) && is_bool( $query_vars['reviews_allowed'] ) ) {
			add_filter( 'posts_where', array( $this, 'reviews_allowed_query_where' ), 10, 2 );
		}

		return apply_filters( 'woocommerce_product_data_store_cpt_get_products_query', $wp_query_args, $query_vars, $this );
	}

	/**
	 * Query for Products matching specific criteria.
	 *
	 * @since WC-3.2.0
	 *
	 * @param array $query_vars Query vars from a WC_Product_Query.
	 *
	 * @return array|object
	 */
	public function query( $query_vars ) {
		$args = $this->get_wp_query_args( $query_vars );

		if ( ! empty( $args['errors'] ) ) {
			$query = (object) array(
				'posts'         => array(),
				'found_posts'   => 0,
				'max_num_pages' => 0,
			);
		} else {
			$query = new WP_Query( $args );
		}

		if ( isset( $query_vars['return'] ) && 'objects' === $query_vars['return'] && ! empty( $query->posts ) ) {
			// Prime caches before grabbing objects.
			update_post_caches( $query->posts, array( 'product', 'product_variation' ) );
		}

		$products = ( isset( $query_vars['return'] ) && 'ids' === $query_vars['return'] ) ? $query->posts : array_filter( array_map( 'wc_get_product', $query->posts ) );

		if ( isset( $query_vars['paginate'] ) && $query_vars['paginate'] ) {
			return (object) array(
				'products'      => $products,
				'total'         => $query->found_posts,
				'max_num_pages' => $query->max_num_pages,
			);
		}

		return $products;
	}
}
