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<?php
/**
 * Wishlist data
 *
 * @version 1.0.0
 *
 * @package WCBoost\Wishlist
 */

namespace WCBoost\Wishlist;

defined( 'ABSPATH' ) || exit;

use WCBoost\Wishlist\Helper;

/**
 * Class \WCBoost\Wishlist\Wishlist
 */
class Wishlist extends \WC_Data {

/**
	 * Data array, with defaults.
	 *
	 * @var array
	 */
	protected $data = [
		'wishlist_id'    => '',
		'wishlist_title' => '',
		'wishlist_slug'  => '',
		'wishlist_token' => '',
		'description'    => '',
		'menu_order'     => 0,
		'status'         => 'shared',
		'user_id'        => 0,
		'session_id'     => '',
		'date_created'   => '',
		'date_modified'  => '',
		'date_expires'   => '',
		'is_default'     => false,
	];

/**
	 * Wishlist items
	 *
	 * @var array
	 */
	protected $items = [];

/**
	 * Wishlist items that will be removed
	 *
	 * @var array
	 */
	protected $removing_items = [];

/**
	 * This is the name of this object type.
	 *
	 * @var string
	 */
	protected $object_type = 'wcboost_wishlist';

/**
	 * Cache group.
	 *
	 * @var string
	 */
	protected $cache_group = 'wishlists';

/**
	 * Stores if the items have been read from the database.
	 *
	 * @var bool
	 */
	private $items_read = false;

/**
	 * Total number of items in the wishlist.
	 *
	 * @var int
	 */
	protected $total_items = 0;

/**
	 * Wishlist constructor. Loads wishlist data.
	 *
	 * @param mixed $data Wishlist data, object, ID or token.
	 */
	public function __construct( $data = '' ) {
		parent::__construct( $data );

$this->data_store = \WC_Data_Store::load( 'wcboost_wishlist' );

// If we already have a wishlist object, read it again.
		if ( $data instanceof self ) {
			$this->set_id( absint( $data->get_wishlist_id() ) );
			$this->set_wishlist_id( absint( $data->get_wishlist_id() ) );
			$this->read_object_from_database();
			return;
		}

// Set the data manually.
		if ( is_array( $data ) ) {
			$this->read_manual_data( $data );
			return;
		}

// Try to load wishlist using ID or token.
		if ( is_int( $data ) && $data ) {
			$this->set_id( $data );
			$this->set_wishlist_id( $data );
		} elseif ( ! empty( $data ) && is_string( $data ) ) {
			$this->set_wishlist_token( $data );
		} else {
			$this->read_new_data();
			$this->set_object_read( true );
		}

$this->read_object_from_database();
	}

/**
	 * If the object has an ID, read using the data store.
	 */
	protected function read_object_from_database() {
		if ( $this->get_wishlist_id() <= 0 && empty( $this->get_wishlist_token() ) ) {
			return;
		}

try {
			$this->data_store->read( $this );
			$this->read_totlal_items();
		} catch ( \Exception $e ) {
			if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
				// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
				error_log( 'Error reading wishlist: ' . $e->getMessage() );
			}
		}
	}

/**
	 * Developers can programmatically return wishlists.
	 *
	 * @param array $data Array of wishlist properties.
	 */
	protected function read_manual_data( $data ) {
		if ( ! empty( $data['expiry_date'] ) && empty( $data['date_expires'] ) ) {
			$data['date_expires'] = $data['expiry_date'];
		}

$this->set_props( $data );
		$this->set_id( 0 );

if ( $this->get_wishlist_id() > 0 ) {
			$this->read_totlal_items();
		}
	}

/**
	 * Get the total count of items in the wishlist from database.
	 *
	 * @since 1.1.6
	 *
	 * @return void
	 */
	public function read_totlal_items() {
		$this->total_items = $this->get_data_store()->get_items_count( $this );
	}

/**
	 * Set the data for new wishlist
	 */
	protected function read_new_data() {
		$this->set_user_id( get_current_user_id() );
		$this->set_date_created( time() );
		$this->set_date_modified( time() );

if ( ! is_user_logged_in() ) {
			$this->set_date_expires( strtotime( '+30 days' ) );
			$this->set_session_id( $this->data_store->generate_session_id() );
		}
	}

/**
	 * Set wishlist id
	 *
	 * @param int $id Wishlist ID.
	 */
	public function set_wishlist_id( $id ) {
		$this->set_prop( 'wishlist_id', absint( $id ) );
	}

/**
	 * Set wishlist title
	 *
	 * @param string $title Wishlist title.
	 */
	public function set_wishlist_title( $title ) {
		$this->set_prop( 'wishlist_title', $title );
	}

/**
	 * Set wishlist slug
	 *
	 * @param string $slug Wishlist slug.
	 */
	public function set_wishlist_slug( $slug ) {
		$this->set_prop( 'wishlist_slug', $slug );
	}

/**
	 * Set wishlist token
	 *
	 * @param string $token Wishlist token.
	 */
	public function set_wishlist_token( $token ) {
		$this->set_prop( 'wishlist_token', (string) $token );
	}

/**
	 * Set wishlist description
	 *
	 * @param string $description Wishlist description.
	 */
	public function set_description( $description ) {
		$this->set_prop( 'description', $description );
	}

/**
	 * Set menu order
	 *
	 * @param int $order Menu order.
	 */
	public function set_menu_order( $order ) {
		$this->set_prop( 'menu_order', absint( $order ) );
	}

/**
	 * Set wishlist status
	 *
	 * @since 1.2.2 Support multi-status format (for deleted wishlists)
	 * @param string $status The wishlist status "shared", "private", "publish" or "trash".
	 */
	public function set_status( $status ) {
		$status_parts   = array_map( 'trim', explode( ',', $status ) );
		$valid_statuses = [ 'shared', 'private', 'publish', 'trash' ];

$all_valid = true;
		foreach ( $status_parts as $part ) {
			if ( ! in_array( $part, $valid_statuses, true ) ) {
				$all_valid = false;
				break;
			}
		}

if ( $all_valid ) {
			$this->set_prop( 'status', (string) $status );
		}
	}

/**
	 * Set wishlist user id
	 *
	 * @param int $user_id The ID of user who created the wishlist.
	 */
	public function set_user_id( $user_id ) {
		$this->set_prop( 'user_id', absint( $user_id ) );
	}

/**
	 * Set wishlist user id
	 *
	 * @param string $session_id Wishlist session ID.
	 */
	public function set_session_id( $session_id ) {
		$this->set_prop( 'session_id', $session_id );
	}

/**
	 * Set created date.
	 *
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_created( $date ) {
		$this->set_date_prop( 'date_created', $date );
	}

/**
	 * Set modified date.
	 *
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_modified( $date ) {
		$this->set_date_prop( 'date_modified', $date );
	}

/**
	 * Set expiration date.
	 *
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_expires( $date ) {
		$this->set_date_prop( 'date_expires', $date );
	}

/**
	 * Set wishlist title
	 *
	 * @param bool $is_default Whether the wishlist is default.
	 */
	public function set_is_default( $is_default ) {
		$this->set_prop( 'is_default', (bool) $is_default );
	}

/**
	 * Get wishlist title
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return int Wishlist ID.
	 */
	public function get_wishlist_id( $context = 'view' ) {
		return intval( $this->get_prop( 'wishlist_id', $context ) );
	}

/**
	 * Get wishlist title
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Wishlist title.
	 */
	public function get_wishlist_title( $context = 'view' ) {
		return $this->get_prop( 'wishlist_title', $context );
	}

/**
	 * Get wishlist slug
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Wishlist slug.
	 */
	public function get_wishlist_slug( $context = 'view' ) {
		return $this->get_prop( 'wishlist_slug', $context );
	}

/**
	 * Get wishlist token
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Wishlist token.
	 */
	public function get_wishlist_token( $context = 'view' ) {
		return trim( $this->get_prop( 'wishlist_token', $context ) );
	}

/**
	 * Get wishlist description
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Wishlist description.
	 */
	public function get_description( $context = 'view' ) {
		return $this->get_prop( 'description', $context );
	}

/**
	 * Get menu order
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return int Menu order.
	 */
	public function get_menu_order( $context = 'view' ) {
		return intval( $this->get_prop( 'menu_order', $context ) );
	}

/**
	 * Get wishlist status
	 *
	 * @since 1.2.2 Support multi-status format. The primary status is the first part of the comma-separated string.
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Wishlist status (the primary status).
	 */
	public function get_status( $context = 'view' ) {
		$status = $this->get_prop( 'status', $context );

// Return raw status for edit context (used by data store).
		if ( 'edit' === $context ) {
			return $status;
		}

// Return only primary status for view context (public API).
		return explode( ',', $status )[0];
	}

/**
	 * Get user id
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return int User ID.
	 */
	public function get_user_id( $context = 'view' ) {
		return intval( $this->get_prop( 'user_id', $context ) );
	}

/**
	 * Get session id
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return string Session ID.
	 */
	public function get_session_id( $context = 'view' ) {
		return $this->get_prop( 'session_id', $context );
	}

/**
	 * Get created date
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return \WC_DateTime|null
	 */
	public function get_date_created( $context = 'view' ) {
		return $this->get_prop( 'date_created', $context );
	}

/**
	 * Get modified date
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return \WC_DateTime|null
	 */
	public function get_date_modified( $context = 'view' ) {
		return $this->get_prop( 'date_modified', $context );
	}

/**
	 * Get expire date
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return \WC_DateTime|null
	 */
	public function get_date_expires( $context = 'view' ) {
		return $this->get_prop( 'date_expires', $context );
	}

/**
	 * Get value of the prop is_default
	 *
	 * @param string $context What the value is for. Valid values are 'view' and 'edit'.
	 *
	 * @return bool Whether the wishlist is default.
	 */
	public function get_is_default( $context = 'view' ) {
		return \wc_string_to_bool( $this->get_prop( 'is_default', $context ) );
	}

/**
	 * Check if current wishlist is default
	 *
	 * @return bool Whether the wishlist is default.
	 */
	public function is_default() {
		return $this->get_is_default();
	}

/**
	 * Move the wishlist to trash by updating the status and set the expires date.
	 *
	 * @return bool Whether the wishlist is moved to trash.
	 */
	public function trash() {
		if ( 'trash' === $this->get_status() ) {
			return false;
		}

if ( $this->data_store ) {
			do_action( 'wcboost_wishlist_move_to_trash', $this );

$this->set_status( 'trash,' . $this->get_status() );
			$this->set_date_expires( strtotime( '+30 days' ) );
			$this->save();

do_action( 'wcboost_wishlist_moved_to_trash', $this );

return true;
		}

return false;
	}

/**
	 * Restore trashed wishlist
	 *
	 * @return bool Whether the wishlist is restored.
	 */
	public function restore() {
		if ( $this->data_store && 'trash' === $this->get_status() ) {
			do_action( 'wcboost_wishlist_restore', $this );

// Extract previous status from multi-status format.
			$full_status     = $this->get_prop( 'status' );
			$status_parts    = explode( ',', $full_status );
			$previous_status = isset( $status_parts[1] ) ? trim( $status_parts[1] ) : 'private';

$this->set_status( $previous_status );
			$this->set_date_expires( '' );
			$this->save();

do_action( 'wcboost_wishlist_restored', $this );

return true;
		}

return false;
	}

/**
	 * Add a new item to the wishlist
	 *
	 * @param \WCBoost\Wishlist\Wishlist_Item $item Item to be added.
	 *
	 * @return bool|\WP_Error Returns TRUE on success, FALSE on failure. WP_Error on invalid.
	 */
	public function add_item( $item ) {
		if ( ! $item instanceof Wishlist_Item || ! $item->get_product_id() ) {
			return false;
		}

if ( $this->has_item( $item ) ) {
			return new \WP_Error( 'item_exists', esc_html__( 'This item already exists', 'wcboost-wishlist' ) );
		}

$product = $item->get_product();

if ( ! $product || ! $product->exists() || ( 'publish' !== $product->get_status() && ! current_user_can( 'edit_post', $product->get_id() ) ) ) {
			$item->trash();

if ( ! $product || ! $product->exists() ) {
				$message = esc_html__( 'A product has been removed from your wishlist because it does not exist anymore.', 'wcboost-wishlist' );
			} else {
				/* translators: %s product name */
				$message = sprintf( esc_html__( 'The product "%s" has been removed from your wishlist because it can no longer be purchased.', 'wcboost-wishlist' ), $product->get_title() );
			}

wc_add_notice( $message, 'error' );
			return false;
		}

// Update the item data.
		$item->set_wishlist_id( $this->get_wishlist_id() );

if ( ! $item->get_id() ) {
			$item->set_date_added( time() );
		}

$this->items[ $item->get_item_key() ] = $item;

// Save to database if this is a new item.
		if ( ! $item->get_id() ) {
			$item->save();
			$this->save();
		}

// If this is not initial loading, trigger the action.
		if ( ! $this->get_data_store()->is_reading() ) {
			do_action( 'wcboost_wishlist_add_item', $item );
		}

return true;
	}

/**
	 * Remove a wishlist item
	 *
	 * @param string $item_key The item key or item object.
	 *
	 * @return bool|\WP_Error Returns TRUE on success, WP_Error on invalid.
	 */
	public function remove_item( $item_key ) {
		if ( ! $this->can_edit() ) {
			return new \WP_Error( 'no_permission', esc_html__( 'You are not allowed to edit the wishlist', 'wcboost-wishlist' ) );
		}

if ( ! $this->has_item( $item_key ) ) {
			return new \WP_Error( 'not_exists', esc_html__( 'Invalid wishlist item', 'wcboost-wishlist' ) );
		}

$item = $this->get_item( $item_key );

do_action( 'wcboost_wishlist_remove_item', $item );

if ( $item->trash() ) {
			$this->add_item_to_trash( $item );
			$this->save();

do_action( 'wcboost_wishlist_removed_item', $item );

return true;
		}

return false;
	}

/**
	 * Restore an item
	 *
	 * @param string|\WCBoost\Wishlist\Wishlist_Item $item Item to be restored.
	 *
	 * @return bool|\WP_Error Returns TRUE on success, WP_Error on invalid.
	 */
	public function restore_item( $item ) {
		if ( ! $this->can_edit() ) {
			return new \WP_Error( 'no_permission', esc_html__( 'You are not allowed to edit the wishlist', 'wcboost-wishlist' ) );
		}

// Load items if not already loaded.
		if ( ! $this->get_items_read() ) {
			$this->get_items();
		}

$item_key = is_string( $item ) ? $item : $item->get_item_key();

if ( ! array_key_exists( $item_key, $this->removing_items ) ) {
			return new \WP_Error( 'not_exists', esc_html__( 'Invalid wishlist item', 'wcboost-wishlist' ) );
		}

$item = $this->removing_items[ $item_key ];

do_action( 'wcboost_wishlist_restore_item', $item );

if ( $item->restore() ) {
			$this->items[ $item_key ] = $item;
			$this->remove_item_from_trash( $item );
			$this->save();

do_action( 'wcboost_wishlist_restored_item', $item );

return true;
		}

return false;
	}

/**
	 * Check if an item exists in the wishlist
	 *
	 * @param \WCBoost\Wishlist\Wishlist_Item|string $item Item object or item key.
	 *
	 * @return bool Whether the item exists in the wishlist.
	 */
	public function has_item( $item ) {
		if ( ! is_string( $item ) && ! is_a( $item, '\WCBoost\Wishlist\Wishlist_Item' ) ) {
			return false;
		}

// Always return false if the wishlist is empty.
		if ( $this->is_empty() ) {
			return false;
		}

// If this initial loading, should return false to avoid race conditions and infinite loops.
		if ( $this->get_data_store()->is_reading() ) {
			return false;
		}

// Ensure items are loaded.
		if ( ! $this->get_items_read() ) {
			$this->get_items();
		}

$item_key = is_string( $item ) ? $item : $item->get_item_key();

// Only check the items array without loading items if they're not read yet.
		return array_key_exists( $item_key, $this->items );
	}

/**
	 * Get item object.
	 *
	 * @param string $item_key Item key.
	 *
	 * @return \WCBoost\Wishlist\Wishlist_Item|bool
	 */
	public function get_item( $item_key ) {
		if ( ! $this->has_item( $item_key ) ) {
			return false;
		}

return $this->items[ $item_key ];
	}

/**
	 * Get the list of items.
	 *
	 * @return \WCBoost\Wishlist\Wishlist_Item[]
	 */
	public function get_items() {
		if ( $this->get_items_read() ) {
			return $this->items;
		}

// No need to load items for non-existing wishlists.
		if ( ! $this->get_wishlist_id() ) {
			return $this->items;
		}

// Don't check for items count, because we need to load trashed items too (for the `restore` action).
		try {
			$this->get_data_store()->read_items( $this );
			$this->set_items_read( true );
		} catch ( \Exception $e ) {
			if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
				// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
				error_log( 'Error loading wishlist items: ' . $e->getMessage() );
			}
		}

return $this->items;
	}

/**
	 * Count items in the wishlist.
	 *
	 * @return int Number of items in the wishlist.
	 */
	public function count_items() {
		// If items are already loaded, count from the items array.
		if ( $this->get_items_read() ) {
			return count( $this->items );
		}

// Otherwise use the total_items property which was loaded with the wishlist data.
		return $this->total_items;
	}

/**
	 * Test if the wishlist is empty.
	 *
	 * @return bool Whether the wishlist is empty.
	 */
	public function is_empty() {
		return $this->count_items() > 0 ? false : true;
	}

/**
	 * Check if current user can edit the wishlist.
	 *
	 * @return bool Whether the current user can edit the wishlist.
	 */
	public function can_edit() {
		if ( ! $this->get_id() ) {
			return false;
		}

if ( 'trash' === $this->get_status() ) {
			return false;
		}

if ( is_user_logged_in() ) {
			$user_id = get_current_user_id();

return ( $user_id && $user_id === $this->get_user_id() );
		}

if ( $this->get_session_id() ) {
			return ( Session::get_session_id() === $this->get_session_id() );
		}

return false;
	}

/**
	 * Check if current user can delete the wishlist.
	 *
	 * @return bool Whether the current user can delete the wishlist.
	 */
	public function can_delete() {
		return $this->can_edit() && ! $this->is_default();
	}

/**
	 * Check if the wishlist is public.
	 *
	 * @return bool Whether the wishlist is public.
	 */
	public function is_public() {
		return $this->get_status() === 'publish';
	}

/**
	 * Check if the wishlist is shareable.
	 *
	 * @return bool Whether the wishlist is shareable.
	 */
	public function is_shareable() {
		return in_array( $this->get_status(), [ 'publish', 'shared' ], true );
	}

/**
	 * Save should create or update based on object existence.
	 * Also set the session id for guests.
	 *
	 * @return int
	 */
	public function save() {
		$this->set_date_modified( time() );

parent::save();

if ( ! is_user_logged_in() ) {
			Session::set_session_id( $this->get_session_id() );
		}

return $this->get_id();
	}

/**
	 * Save wishlist items.
	 *
	 * @return int Wishlist ID.
	 */
	public function save_items() {
		if ( ! $this->data_store ) {
			return $this->get_id();
		}

foreach ( $this->items as $item ) {
			$item->save();
		}

return $this->get_id();
	}

/**
	 * Add an item to trash
	 *
	 * @param \WCBoost\Wishlist\Wishlist_Item $item Item to be added to trash.
	 *
	 * @return bool Whether the item is added to trash.
	 */
	public function add_item_to_trash( $item ) {
		if ( ! $item instanceof Wishlist_Item ) {
			return false;
		}

// Ensure the item status is correct.
		$item->set_status( 'trash' );
		$this->removing_items[ $item->get_item_key() ] = $item;

if ( $this->has_item( $item ) ) {
			unset( $this->items[ $item->get_item_key() ] );
			$this->save();
		}

return true;
	}

/**
	 * Remove an item from the trash
	 *
	 * @param \WCBoost\Wishlist\Wishlist_Item $item Item to be removed from trash.
	 *
	 * @return bool Whether the item is removed from trash.
	 */
	public function remove_item_from_trash( $item ) {
		if ( ! $item instanceof Wishlist_Item ) {
			return false;
		}

unset( $this->removing_items[ $item->get_item_key() ] );

return true;
	}

/**
	 * Empty the wishlist.
	 *
	 * @since 1.1.4
	 *
	 * @return void
	 */
	public function empty() {
		foreach ( $this->items as $item ) {
			$item->trash();
			$this->add_item_to_trash( $item );
		}

$this->items = [];
		$this->save();

do_action( 'wcboost_wishlist_emptied', $this );
	}

/**
	 * Check if the wishlist has a product.
	 *
	 * @since 1.1.4
	 *
	 * @param int $product_id Product ID.
	 *
	 * @return bool Whether the wishlist has the product.
	 */
	public function has_product( $product_id ) {
		foreach ( $this->items as $item ) {
			if ( $item->get_product_id() === $product_id ) {
				return true;
			}
		}

return false;
	}

/**
	 * Get the public URL of the wishlist.
	 *
	 * @return string Wishlist public URL.
	 */
	public function get_public_url() {
		$url = Plugin::instance()->query->get_endpoint_url( 'wishlist-token', $this->get_wishlist_token() );

return apply_filters( 'wcboost_wishlist_public_url', $url, $this );
	}

/**
	 * Get the edit URL of the wishlist
	 *
	 * @return string Wishlist edit URL.
	 */
	public function get_edit_url() {
		$url = Plugin::instance()->query->get_endpoint_url( 'edit-wishlist', $this->get_wishlist_token() );

return apply_filters( 'wcboost_wishlist_edit_url', $url, $this );
	}

/**
	 * Get the restore URL of the wishlist
	 *
	 * @since 1.2.2
	 *
	 * @return string Wishlist restore URL.
	 */
	public function get_restore_url() {
		$url = add_query_arg(
			[
				'untrash-wishlist' => $this->get_wishlist_token(),
				'_wpnonce'         => wp_create_nonce( 'wcboost-wishlist-untrash' ),
			],
			wc_get_page_permalink( 'wishlist' )
		);

return apply_filters( 'wcboost_wishlist_restore_url', $url, $this );
	}

/**
	 * Get the delete URL of the wishlist
	 *
	 * @since 1.2.2
	 *
	 * @return string Wishlist delete URL.
	 */
	public function get_delete_url() {
		$url = add_query_arg(
			[
				'remove-wishlist' => $this->get_wishlist_token(),
				'_wpnonce'        => wp_create_nonce( 'wcboost-wishlist-remove' ),
			],
			wc_get_page_permalink( 'wishlist' )
		);

return apply_filters( 'wcboost_wishlist_delete_url', $url, $this );
	}

/**
	 * Get unique hash key for the wishlist.
	 * For all temporary wishlists, the Key is the same.
	 *
	 * @since 1.1.1
	 * @since 1.1.2 Always generate the hash key. A fixed key is generated for temporary wishlists.
	 * @since 1.1.6 Using the helper function and allow fillter hooks.
	 *
	 * @return string
	 */
	public function get_hash_key() {
		return Helper::get_wishlist_hash_key( $this );
	}

/**
	 * Get hash content for the wishlist.
	 * For all temporary wishlists, the content is the same because all params are the same,
	 * which are: { wishlist_token: '', date_modified: '', count: 0 }
	 *
	 * @since 1.1.1
	 * @since 1.1.2 Always generate hash content
	 * @since 1.1.6 Replace hash param `items` by `date_modified`
	 *
	 * @return string
	 */
	public function get_hash_content() {
		$token         = $this->get_wishlist_token();
		$date_modified = $this->get_date_modified();
		$count_items   = $this->count_items();

// With temporary wishlists, empty the `date_modified` to generate the same hash content.
		if ( ! $this->get_id() ) {
			$date_modified = '';
		}

$hash = md5( $token . $date_modified . $count_items );

return apply_filters( 'wcboost_wishlist_hash', $hash, $this );
	}

/**
	 * Get hash for the wishlist.
	 * Generated by combining the hash_key and hash_content.
	 *
	 * @since 1.1.1
	 *
	 * @return string Wishlist hash in format HASH_KEY::HASH_CONTENTS
	 */
	public function get_hash() {
		return $this->get_hash_key() . '::' . $this->get_hash_content();
	}

/**
	 * Merge items from another wishlist.
	 *
	 * @since 1.1.4
	 *
	 * @param \WCBoost\Wishlist\Wishlist $wishlist Wishlist to merge.
	 *
	 * @return int Number of items merged.
	 */
	public function merge( $wishlist ) {
		$this->data_store->set_is_reading( true );

$merged_count = 0;

foreach ( $wishlist->get_items() as $item ) {
			$adding_product = $item->get_product();
			$merging_item   = new Wishlist_Item( $adding_product );

$merged = $this->add_item( $merging_item );

if ( $merged && ! is_wp_error( $merged ) ) {
				++$merged_count;
			}
		}

$this->data_store->set_is_reading( false );

return $merged_count;
	}

/**
	 * Set if items have been read from the database.
	 *
	 * @param bool $read Whether items have been read from the database.
	 */
	public function set_items_read( $read = true ) {
		$this->items_read = (bool) $read;
	}

/**
	 * Return if items have been read from the database.
	 *
	 * @return bool Whether items have been read from the database.
	 */
	public function get_items_read() {
		return (bool) $this->items_read;
	}
}