<?php
/**
 * Product function class
 *
 * @since             1.5.0
 * @package           TInvWishlist\Products
 */

// If this file is called directly, abort.
if ( ! defined( 'ABSPATH' ) ) {
	die;
}

/**
 * Product function class
 */
class TInvWL_Product {

	/**
	 * Table name
	 *
	 * @var string
	 */
	private $table;
	/**
	 * Plugin name
	 *
	 * @var string
	 */
	private $_name;
	/**
	 * Wishlist object
	 *
	 * @var array
	 */
	public $wishlist;
	/**
	 * User id
	 *
	 * @var integer
	 */
	public $user;

	/**
	 * Constructor
	 *
	 * @param array $wishlist Object wishlist.
	 * @param string $plugin_name Plugin name.
	 *
	 * @global wpdb $wpdb
	 *
	 */
	function __construct( $wishlist = array(), $plugin_name = TINVWL_PREFIX ) {
		global $wpdb;

		$this->wishlist = (array) $wishlist;
		$this->_name    = $plugin_name;
		$this->table    = sprintf( '%s%s_%s', $wpdb->prefix, $this->_name, 'items' );
		$this->user     = $this->wishlist_author();
		if ( empty( $this->user ) ) {
			$user = wp_get_current_user();
			if ( $user->exists() ) {
				$this->user = $user->ID;
			}
		}

		add_filter( 'tinvwl_addtowishlist_add_form', array( $this, 'clean_meta' ), 10, 1 );
	}

	/**
	 * Get wishlist id
	 *
	 * @return int
	 */
	function wishlist_id() {
		if ( is_array( $this->wishlist ) && array_key_exists( 'ID', $this->wishlist ) ) {
			return $this->wishlist['ID'];
		}

		return 0;
	}

	/**
	 * Get author wishlist
	 *
	 * @return int
	 */
	function wishlist_author() {
		if ( is_array( $this->wishlist ) && array_key_exists( 'author', $this->wishlist ) ) {
			return $this->wishlist['author'];
		}

		return 0;
	}

	/**
	 * Add\Update product
	 *
	 * @param array $data Object product.
	 * @param array $meta Object meta form data.
	 *
	 * @return boolean
	 */
	function add_product( $data = array(), $meta = array() ) {
		$_data = filter_var_array( $data, array(
			'product_id'   => FILTER_VALIDATE_INT,
			'variation_id' => FILTER_VALIDATE_INT,
			'wishlist_id'  => FILTER_VALIDATE_INT,
			'quantity'     => FILTER_FORCE_ARRAY | FILTER_FLAG_ALLOW_FRACTION,
		) );

		if ( empty( $_data['quantity'] ) ) {
			$_data['quantity'] = 1;
		}
		if ( array_key_exists( 'quantity', $data ) && 0 === $data['quantity'] ) {
			$_data['quantity'] = 0;
		}
		if ( empty( $_data['wishlist_id'] ) ) {
			$_data['wishlist_id'] = $this->wishlist_id();
		}
		$product_data = $this->check_product( $_data['product_id'], $_data['variation_id'], $_data['wishlist_id'], $meta );
		if ( false === $product_data ) {
			return false;
		}
		if ( $product_data ) {
			$data['quantity'] = $product_data['quantity'] + $_data['quantity'];

			return $this->update( $data, $meta, $product_data['ID'] );
		} else {
			return $this->add( $data, $meta );
		}
	}

	/**
	 * Add product
	 *
	 * @param array $data Object product.
	 * @param array $meta Object meta form data.
	 *
	 * @return boolean
	 * @global wpdb $wpdb
	 *
	 */
	function add( $data = array(), $meta = array() ) {

		$data_original = $data;

		$default = array(
			'author'       => $this->user,
			'date'         => current_time( 'Y-m-d H:i:s' ),
			'in_stock'     => 1,
			'price'        => 0,
			'product_id'   => 0,
			'quantity'     => 1,
			'variation_id' => 0,
			'wishlist_id'  => $this->wishlist_id(),
		);
		$data    = apply_filters( 'tinvwl_wishlist_product_add_field', filter_var_array( $data, array(
			'author'       => FILTER_VALIDATE_INT,
			'product_id'   => FILTER_VALIDATE_INT,
			'quantity'     => FILTER_SANITIZE_NUMBER_FLOAT | FILTER_FLAG_ALLOW_FRACTION,
			'variation_id' => FILTER_VALIDATE_INT,
			'wishlist_id'  => FILTER_VALIDATE_INT,
		) ) );
		$data    = array_filter( $data );

		if ( array_key_exists( 'quantity', $data_original ) && 0 === $data_original['quantity'] ) {
			$data['quantity'] = 0;
		}

		$data = tinv_array_merge( $default, $data );

		if ( empty( $data['wishlist_id'] ) || empty( $data['product_id'] ) ) {
			return false;
		}

		$product_data = $this->product_data( $data['product_id'], $data['variation_id'] );

		if ( $data['quantity'] < 0 || ! $product_data ) {
			return false;
		}

		if ( $product_data->is_sold_individually() ) {
			$data['quantity'] = 1;
		}

		$data                 = apply_filters( 'tinvwl_wishlist_product_add', $data );
		$data['product_id']   = $product_data->is_type( 'variation' ) ? $product_data->get_parent_id() : $product_data->get_id();
		$data['variation_id'] = $product_data->is_type( 'variation' ) ? $product_data->get_id() : 0;
		$data['in_stock']     = $product_data->is_in_stock();

		$data['formdata'] = $this->prepare_save_meta( $meta, $data['product_id'], $data['variation_id'] );

		if ( $product_data->is_type( 'variable' ) ) {
			$data['price'] = filter_var( $product_data->get_variation_price( 'max', false ), FILTER_VALIDATE_FLOAT );
		} else {
			$data['price'] = filter_var( $product_data->get_price(), FILTER_VALIDATE_FLOAT );
		}

		global $wpdb;
		if ( $wpdb->insert( $this->table, $data ) ) { // @codingStandardsIgnoreLine WordPress.VIP.DirectDatabaseQuery.DirectQuery
			$id = $wpdb->insert_id;

			/* Run a 3rd party code when product added to a wishlist.
			 *
			 * @param array $data product data including author and wishlist IDs.
			 * */
			do_action( 'tinvwl_product_added', $data );
			$wla = new TInvWL_Analytics( $this->wishlist );
			$wla->cart_product( $data['product_id'], $data['variation_id'] );

			return $id;
		}

		return false;
	}

	/**
	 * Get products by wishlist
	 *
	 * @param array $data Request.
	 *
	 * @return array
	 */
	function get_wishlist( $data = array(), $count = false ) {
		if ( ! array_key_exists( 'wishlist_id', $data ) ) {
			$data['wishlist_id'] = $this->wishlist_id();
		}
		if ( empty( $data['wishlist_id'] ) ) {
			return array();
		}

		return $this->get( $data, $count );
	}

	/**
	 * Check existing product
	 *
	 * @param integer $product_id Product id.
	 * @param integer $variation_id Product variaton id.
	 * @param integer $wishlist_id If exist wishlist object, you can put 0.
	 * @param array $meta Object meta form data.
	 *
	 * @return mixed
	 */
	function check_product( $product_id, $variation_id = 0, $wishlist_id = 0, $meta = array() ) {
		$product_id   = absint( $product_id );
		$variation_id = absint( $variation_id );
		$wishlist_id  = absint( $wishlist_id );

		if ( empty( $wishlist_id ) ) {
			$wishlist_id = $this->wishlist_id();
		}
		if ( empty( $wishlist_id ) || empty( $product_id ) ) {
			return false;
		}

		$product_data = $this->product_data( $product_id, $variation_id );

		if ( ! $product_data ) {
			return false;
		}

		$product_id   = $product_data->is_type( 'variation' ) ? $product_data->get_parent_id() : $product_data->get_id();
		$variation_id = $product_data->is_type( 'variation' ) ? $product_data->get_id() : 0;

		$products = $this->get( array(
			'product_id'   => $product_id,
			'variation_id' => $variation_id,
			'wishlist_id'  => $wishlist_id,
			'formdata'     => $this->prepare_save_meta( $meta, $product_id, $variation_id ),
			'count'        => 1,
			'external'     => false,
		) );

		return array_shift( $products );
	}

	/**
	 * Get products
	 *
	 * @param array $data Request.
	 * @param bool $count COUNT QUERY.
	 *
	 * @return array
	 * @global wpdb $wpdb
	 *
	 */
	function get( $data = array(), $count = false ) {
		global $wpdb;

		$default = array(
			'count'    => 10,
			'field'    => null,
			'offset'   => 0,
			'order'    => 'DESC',
			'order_by' => 'date',
			'external' => true,
			'sql'      => '',
		);

		foreach ( $default as $_k => $_version ) {
			if ( array_key_exists( $_k, $data ) ) {
				$default[ $_k ] = $data[ $_k ];
				unset( $data[ $_k ] );
			}
		}

		$default['offset'] = absint( $default['offset'] );
		$default['count']  = absint( $default['count'] );
		//the order value is passed directly to the db so it needs to be protected against sql_injections
		$valid_order_values = array( 'ASC', 'DESC' );
		if ( ! in_array( strtoupper( $default['order'] ), $valid_order_values, true ) ) {
			$default['order'] = 'DESC';
		}
		if ( is_array( $default['field'] ) ) {
			$default['field'] = '`' . implode( '`,`', $default['field'] ) . '`';
		} elseif ( is_string( $default['field'] ) ) {
			$default['field'] = array( 'ID', $default['field'] );
			$default['field'] = '`' . implode( '`,`', $default['field'] ) . '`';
		} else {
			$default['field'] = '*';
		}
		if ( $count ) {
			$default['field'] = 'COUNT(`ID`) as `count`';
		}

		$sql = "SELECT {$default[ 'field' ]} FROM `{$this->table}`";

		$where = '1';

		if ( ! empty( $data ) && is_array( $data ) ) {
			if ( array_key_exists( 'meta', $data ) ) {
				unset( $data['meta'] );
			}
			foreach ( $data as $f => $v ) {
				$s = is_array( $v ) ? ' IN ' : '=';
				if ( is_array( $v ) ) {
					foreach ( $v as $_f => $_version ) {
						$v[ $_f ] = $wpdb->prepare( '%s', $_version );
					}
					$v = implode( ',', $v );
					$v = "($v)";
				} else {
					$v = $wpdb->prepare( '%s', $v );
				}
				$data[ $f ] = sprintf( '`%s`%s%s', $f, $s, $v );
			}
			$where = implode( ' AND ', $data );
			$sql   .= ' WHERE ' . $where;
		}

		$sql .= sprintf( ' ORDER BY `%s` %s LIMIT %d,%d;', $default['order_by'], $default['order'], $default['offset'], $default['count'] );
		if ( ! empty( $default['sql'] ) ) {
			$replacer    = $replace = array();
			$replace[0]  = '{table}';
			$replacer[0] = $this->table;
			$replace[1]  = '{where}';
			$replacer[1] = $where;

			foreach ( $default as $key => $value ) {
				$i = count( $replace );

				$replace[ $i ]  = '{' . $key . '}';
				$replacer[ $i ] = $value;
			}

			$sql = str_replace( $replace, $replacer, $default['sql'] );
		}

		$products = $wpdb->get_results( $sql, ARRAY_A ); // WPCS: db call ok; no-cache ok; unprepared SQL ok.

		if ( empty( $products ) || is_wp_error( $products ) ) {
			return array();
		}

		if ( $count ) {
			return $products[0]['count'];
		}
		$ids = array();
		foreach ( $products as $k => $product ) {
			if ( empty( $default['sql'] ) ) {
				$product = filter_var_array( $product, array(
					'ID'           => FILTER_VALIDATE_INT,
					'wishlist_id'  => FILTER_VALIDATE_INT,
					'product_id'   => FILTER_VALIDATE_INT,
					'variation_id' => FILTER_VALIDATE_INT,
					'author'       => FILTER_VALIDATE_INT,
					'date'         => FILTER_DEFAULT,
					'formdata'     => FILTER_DEFAULT,
					'quantity'     => FILTER_SANITIZE_NUMBER_FLOAT | FILTER_FLAG_ALLOW_FRACTION,
					'price'        => FILTER_SANITIZE_NUMBER_FLOAT | FILTER_FLAG_ALLOW_FRACTION,
					'in_stock'     => FILTER_VALIDATE_BOOLEAN,
				) );
				if ( ! tinv_get_option( 'general', 'quantity_func' ) ) {
					$product['quantity'] = 1;
				}
			}

			if ( $default['external'] ) {
				if ( isset( $product['product_id'] ) ) {
					$ids[] = ( apply_filters( 'wpml_object_id', $product['product_id'], 'product', false ) ) ? apply_filters( 'wpml_object_id', $product['product_id'], 'product', false ) : $product['product_id'];
				}
			}
			$product['meta'] = array();
			if ( array_key_exists( 'formdata', $product ) ) {
				$meta = $product['formdata'];
				unset( $product['formdata'] );

				$product['meta'] = $this->prepare_retrun_meta( $meta, $product['product_id'], $product['variation_id'], $product['quantity'] );
			}
			$products[ $k ] = apply_filters( 'tinvwl_wishlist_product_get', $product );
		}

		if ( ! empty( $ids ) ) {
			$args      = array(
				'include' => $ids,
				'limit'   => count( $ids ),
			);
			$_products = wc_get_products( $args );

			foreach ( $_products as $_product ) {

				foreach ( $products as $key => $wlproduct ) {
					if ( ! isset( $wlproduct['product_id'] ) ) {
						continue;
					}

					if ( $_product->get_id() === absint( ( apply_filters( 'wpml_object_id', $wlproduct['product_id'], 'product', false ) ) ? apply_filters( 'wpml_object_id', $wlproduct['product_id'], 'product', false ) : $wlproduct['product_id'] ) ) {
						if ( in_array( $_product->get_type(), array( 'variable', 'grouped' ) ) ) {
							$use_original_id = false;

							if ( function_exists( 'pll_is_translated_post_type' ) ) {
								$use_original_id = true;
							}

							if ( function_exists( 'wpml_get_current_language' ) ) {

								global $sitepress;

								if ( $sitepress && $sitepress instanceof SitePress ) {
									$wpml_settings = $sitepress->get_settings();
									if ( isset( $wpml_settings['custom_posts_sync_option'] ) && isset( $wpml_settings['custom_posts_sync_option']['product_variation'] ) && in_array( $wpml_settings['custom_posts_sync_option']['product_variation'], array(
											1,
											2,
										) ) ) {
										$use_original_id = true;
									}
								}
							}

							$products[ $key ]['data'] = $wlproduct['variation_id'] ? wc_get_product( apply_filters( 'wpml_object_id', $wlproduct['variation_id'], 'product_variation', $use_original_id ) ) : $_product;
						} else {
							$products[ $key ]['data'] = $_product;
						}
					}
				}
			}

			// remove deleted products from database
			if ( $default['external'] && ! function_exists( 'wpml_get_current_language' ) ) {
				foreach ( $products as $key => $product ) {
					if ( empty( $product['data'] ) ) {
						unset( $products[ $key ] );
						$this->remove( $product );
					}
				}
			}
		}

		// Filter wishlist products
		$products = apply_filters( 'tinvwl_wishlist_get_products', $products, $this );

		return $products;
	}

	/**
	 * Get product info
	 *
	 * @param integer $product_id Product id.
	 * @param integer $variation_id Product variation id.
	 *
	 * @return mixed
	 */
	function product_data( $product_id, $variation_id = 0 ) {
		$product_id   = absint( $product_id );
		$variation_id = absint( $variation_id );

		$product_data = apply_filters( 'tinvwl_product_data', wc_get_product( $variation_id ? $variation_id : $product_id ), $product_id, $variation_id );

		if ( ! $product_data || 'trash' === get_post( $product_data->get_id() )->post_status ) {
			return null;
		}

		return $product_data;
	}

	/**
	 * Update product
	 *
	 * @param array $data Object product.
	 * @param array $meta Object meta form data.
	 * @param int $id Wishlist item ID.
	 *
	 * @return boolean
	 * @global wpdb $wpdb
	 *
	 */
	function update( $data = array(), $meta = array(), $id = 0 ) {
		if ( empty( $meta ) && array_key_exists( 'meta', $data ) && ! empty( $data['meta'] ) ) {
			$meta = $data['meta'];
		}

		$data_original = $data;

		$data = filter_var_array( $data, apply_filters( 'tinvwl_wishlist_product_update_field', array(
			'product_id'   => FILTER_VALIDATE_INT,
			'quantity'     => FILTER_FORCE_ARRAY | FILTER_FLAG_ALLOW_FRACTION,
			'variation_id' => FILTER_VALIDATE_INT,
			'wishlist_id'  => FILTER_VALIDATE_INT,
			'author'       => FILTER_VALIDATE_INT,
			'order'        => FILTER_VALIDATE_INT,
		) ) );
		$data = array_filter( $data );

		if ( ! array_key_exists( 'wishlist_id', $data ) ) {
			$data['wishlist_id'] = $this->wishlist_id();
		}
		if ( ! array_key_exists( 'variation_id', $data ) ) {
			$data['variation_id'] = 0;
		}
		if ( array_key_exists( 'quantity', $data_original ) && 0 === $data_original['quantity'] ) {
			$data['quantity'] = 0;
		}
		if ( ! array_key_exists( 'order', $data ) ) {
			$data['order'] = 0;
		}

		if ( empty( $data['wishlist_id'] ) || empty( $data['product_id'] ) ) {
			return false;
		}
		$product_data = $this->product_data( $data['product_id'], $data['variation_id'] );
		if ( ! $product_data ) {
			return false;
		}

		if ( $product_data->is_sold_individually() ) {
			$data['quantity'] = 1;
		}

		$data                 = apply_filters( 'tinvwl_wishlist_product_update', $data );
		$data['product_id']   = $product_data->is_type( 'variation' ) ? $product_data->get_parent_id() : $product_data->get_id();
		$data['variation_id'] = $product_data->is_type( 'variation' ) ? $product_data->get_id() : 0;
		$data['in_stock']     = $product_data->is_in_stock();

		if ( $product_data->is_type( 'variable' ) ) {
			$data['price'] = filter_var( $product_data->get_variation_price( 'max', false ), FILTER_VALIDATE_FLOAT );
		} else {
			$data['price'] = filter_var( $product_data->get_price(), FILTER_VALIDATE_FLOAT );
		}

		global $wpdb;

		$res_update = $wpdb->update( $this->table, $data, array(
			'product_id'   => $data['product_id'],
			'variation_id' => $data['variation_id'],
			'wishlist_id'  => $data['wishlist_id'],
			'formdata'     => $this->prepare_save_meta( $meta, $data['product_id'], $data['variation_id'] ),
		) ); // WPCS: db call ok; no-cache ok; unprepared SQL ok.

		if ( $res_update !== false ) { // @codingStandardsIgnoreLine WordPress.VIP.DirectDatabaseQuery.DirectQuery

			/* Run a 3rd party code when product updated on a wishlist.
			 *
			 * @param array $data product data including author and wishlist IDs.
			 * */
			do_action( 'tinvwl_product_updated', $data );

			return ( $id ) ? $id : true;
		}

		return false;
	}

	/**
	 * Remove product from wishlist.
	 *
	 * @param int $wishlist_id If exist wishlist object, you can put 0.
	 * @param int $product_id Product ID.
	 * @param int $variation_id Product variation ID.
	 * @param array $meta Object meta form data.
	 *
	 * @return bool
	 */
	function remove_product_from_wl( int $wishlist_id = 0, int $product_id = 0, int $variation_id = 0, array $meta = [] ): bool {
		global $wpdb;
		$wishlist_id  = absint( $wishlist_id );
		$product_id   = absint( $product_id );
		$variation_id = absint( $variation_id );

		if ( empty( $wishlist_id ) ) {
			$wishlist_id = $this->wishlist_id();
		}

		if ( empty( $wishlist_id ) ) {
			return false;
		}

		if ( empty( $product_id ) ) {
			return false !== $wpdb->delete( $this->table, [ 'wishlist_id' => $wishlist_id ] ); // WPCS: db call ok; no-cache ok; unprepared SQL ok.
		}

		$original_meta = $meta;

		if ( ! empty( $meta ) && array_key_exists( 'tinvwl-hidden-fields', $meta ) ) {
			unset( $meta['tinvwl-hidden-fields'] );
		}

		$data                  = [
			'wishlist_id'  => $wishlist_id,
			'product_id'   => $product_id,
			'variation_id' => $variation_id,
		];
		$data['formdata']      = $this->prepare_save_meta( $meta, $data['product_id'], $data['variation_id'] );
		$data['original_meta'] = $this->prepare_save_meta( $original_meta, $data['product_id'], $data['variation_id'] );

		$sql  = "DELETE FROM $this->table WHERE `wishlist_id` = %d AND `product_id` = %d AND `variation_id` = %d";
		$args = [ $data['wishlist_id'], $data['product_id'], $data['variation_id'] ];

		if ( ! empty( $meta ) ) {
			$sql    .= " AND (`formdata` = %s OR `formdata` = %s OR `formdata` = %s OR `formdata` = %s)";
			$args[] = $data['formdata'];
			$args[] = $data['original_meta'];
			$args[] = '{"tinvwl-hidden-fields":"[]"}';
			$args[] = '';
		}

		$prepared_sql = $wpdb->prepare( $sql, $args );
		$result       = $wpdb->query( $prepared_sql );

		if ( $result ) {
			do_action( 'tinvwl_wishlist_product_removed_from_wishlist', $wishlist_id, $product_id, $variation_id );
		}

		return (bool) $result;
	}

	/**
	 * Remove product
	 *
	 * @param integer $product_id Product id.
	 *
	 * @return boolean
	 * @global wpdb $wpdb
	 *
	 */
	function remove_product( $product_id = 0 ) {
		global $wpdb;
		if ( empty( $product_id ) ) {
			return false;
		}
		$product_id = absint( $product_id );

		$result = false !== $wpdb->delete( $this->table, array( 'product_id' => $product_id ) ); // WPCS: db call ok; no-cache ok; unprepared SQL ok.
		if ( $result ) {
			do_action( 'tinvwl_wishlist_product_removed_by_product', $product_id );
		}

		return $result;
	}

	/**
	 * Get wishlist data by product from wishlist
	 *
	 * @param integer $product_id Product id.
	 *
	 * @return bool|array
	 * @global wpdb $wpdb
	 *
	 */
	function get_wishlist_by_product_id( $product_id = 0 ) {
		global $wpdb;
		if ( empty( $product_id ) ) {
			return false;
		}
		$product_id = absint( $product_id );

		$prepared_sql = $wpdb->prepare( "SELECT `wishlist_id` FROM `{$this->table}` WHERE `ID`=%d", $product_id );
		$result       = $wpdb->get_results( $prepared_sql, ARRAY_A );

		if ( ! $result ) {
			return false;
		}

		$wl = new TInvWL_Wishlist();

		return $wl->get_by_id( $result[0]['wishlist_id'] );
	}


	/**
	 * Remove product by ID
	 *
	 * @param array $data Product data.
	 *
	 * @return boolean
	 * @global wpdb $wpdb
	 *
	 */
	function remove( $data ) {
		if ( ! isset( $data['ID'] ) || empty( $data['ID'] ) ) {
			return false;
		}

		global $wpdb;
		$result = false !== $wpdb->delete( $this->table, array( 'ID' => $data['ID'] ) ); // WPCS: db call ok; no-cache ok; unprepared SQL ok.
		if ( $result ) {
			/* Run a 3rd party code when product removed from a wishlist.
			 *
			 * @param array $data product data including author and wishlist IDs.
			 * */
			do_action( 'tinvwl_product_removed', $data );
		}

		return $result;
	}

	/**
	 * Clean meta from default values.
	 *
	 * @param array $meta Meta array.
	 *
	 * @return array
	 */
	function clean_meta( $meta ) {

		foreach (
			array(
				'add-to-cart',
				'product_id',
				'variation_id',
				'quantity',
				'undefined',
				'product_sku',
			) as $field
		) {
			if ( array_key_exists( $field, $meta ) ) {
				unset( $meta[ $field ] );
			}
		}
		$meta = array_filter( $meta );

		return $meta;
	}

	/**
	 * Prepare to save meta in database
	 *
	 * @param array $meta Meta array.
	 * @param ineger $product_id Woocommerce product ID.
	 * @param ineger $variation_id Woocommerce product variation ID.
	 *
	 * @return string
	 */
	function prepare_save_meta( $meta = array(), $product_id = 0, $variation_id = 0 ) {
		if ( ! is_array( $meta ) ) {
			$meta = array();
		}
		$meta = apply_filters( 'tinvwl_product_prepare_meta', $meta, $product_id, $variation_id );
		foreach (
			array(
				'add-to-cart',
				'product_id',
				'variation_id',
				'quantity',
				'undefined',
				'product_sku',
			) as $field
		) {
			if ( array_key_exists( $field, $meta ) ) {
				unset( $meta[ $field ] );
			}
		}
		$meta = array_filter( $meta );
		if ( empty( $meta ) ) {
			return '';
		}

		return json_encode( $meta );
	}

	/**
	 * Convert meta string to array
	 *
	 * @param string $meta Meta array.
	 * @param integer $product_id Product ID.
	 * @param integer $variation_id Variation product ID.
	 * @param integer $quantity Quantity product.
	 *
	 * @return array
	 */
	function prepare_retrun_meta( $meta = '', $product_id = 0, $variation_id = 0, $quantity = 1 ) {
		if ( empty( $meta ) ) {
			return array();
		}
		$meta = @json_decode( $meta, true );
		if ( empty( $meta ) || ! is_array( $meta ) ) {
			return array();
		}
		if ( ! empty( $product_id ) ) {
			$meta['add-to-cart'] = $product_id;
			$meta['product_id']  = $product_id;
			$meta['quantity']    = $quantity;
			if ( ! empty( $variation_id ) ) {
				$meta['variation_id'] = $variation_id;
			}
		}

		return apply_filters( 'tinvwl_wishlist_product_unprepare_meta', $meta );
	}
}
