<?php
/**
 * Registers WooCommerce post types and related schema filters.
 *
 * @package \WPGraphQL\WooCommerce
 * @since   0.0.1
 */

namespace WPGraphQL\WooCommerce;

use GraphQL\Error\UserError;
use WPGraphQL\WooCommerce\Data\Factory;
use WPGraphQL\WooCommerce\Data\Loader\WC_CPT_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Cart_Item_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Customer_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Downloadable_Item_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Order_Item_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Shipping_Method_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Shipping_Zone_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Tax_Class_Loader;
use WPGraphQL\WooCommerce\Data\Loader\WC_Tax_Rate_Loader;
use WPGraphQL\WooCommerce\WP_GraphQL_WooCommerce as WooGraphQL;

/**
 * Class Post_Types
 */
class Post_Types {
	/**
	 * Register filters
	 *
	 * @return void
	 */
	public static function init() {
		// Registers WooCommerce CPTs.
		add_filter( 'register_post_type_args', [ self::class, 'register_post_types' ], 10, 2 );
		add_filter( 'graphql_post_entities_allowed_post_types', [ self::class, 'skip_type_registry' ], 10 );

		// Add data-loaders to AppContext.
		add_filter( 'graphql_data_loader_classes', [ self::class, 'graphql_data_loader_classes' ], 10 );

		// Add node resolvers.
		add_filter(
			'graphql_resolve_node',
			[ '\WPGraphQL\WooCommerce\Data\Factory', 'resolve_node' ],
			10,
			4
		);
		add_filter(
			'graphql_resolve_node_type',
			[ '\WPGraphQL\WooCommerce\Data\Factory', 'resolve_node_type' ],
			10,
			2
		);

		// Filter Unions.
		add_filter(
			'graphql_wp_union_type_config',
			[ self::class, 'inject_union_types' ],
			10,
			2
		);

		add_filter(
			'graphql_union_resolve_type',
			[ self::class, 'inject_type_resolver' ],
			10,
			2
		);

		add_filter(
			'graphql_interface_resolve_type',
			[ self::class, 'inject_type_resolver' ],
			10,
			2
		);

		add_filter(
			'graphql_dataloader_pre_get_model',
			[ '\WPGraphQL\WooCommerce\Data\Loader\WC_CPT_Loader', 'inject_post_loader_models' ],
			10,
			3
		);

		// Filter to allow order notes to be visible in GraphQL queries.
		add_filter(
			'graphql_data_is_private',
			[ self::class, 'make_order_notes_visible' ],
			10,
			3
		);

		// Filter to set order notes visibility to public for authorized users.
		add_filter(
			'graphql_object_visibility',
			[ self::class, 'set_order_notes_visibility' ],
			10,
			5
		);

		add_filter(
			'graphql_dataloader_get_model',
			[ '\WPGraphQL\WooCommerce\Data\Loader\WC_Customer_Loader', 'inject_user_loader_models' ],
			10,
			3
		);

		add_filter(
			'graphql_map_input_fields_to_wp_query',
			[ '\WPGraphQL\WooCommerce\Connection\Coupons', 'map_input_fields_to_wp_query' ],
			10,
			7
		);

		add_filter(
			'graphql_map_input_fields_to_wp_user_query',
			[ '\WPGraphQL\WooCommerce\Connection\Customers', 'map_input_fields_to_wp_query' ],
			10,
			6
		);

		add_filter(
			'graphql_connection',
			[ '\WPGraphQL\WooCommerce\Connection\Customers', 'upgrade_models' ],
			10,
			2
		);

		add_filter(
			'graphql_wp_connection_type_config',
			[ '\WPGraphQL\WooCommerce\Connection\Products', 'set_connection_config' ]
		);
	}

	/**
	 * Registers WooCommerce post-types to be used in GraphQL schema
	 *
	 * @param array  $args      - allowed post-types.
	 * @param string $post_type - name of taxonomy being checked.
	 *
	 * @return array
	 */
	public static function register_post_types( $args, $post_type ) {
		if ( 'product' === $post_type ) {
			$args['show_in_graphql']                  = true;
			$args['model']                            = \WPGraphQL\WooCommerce\Model\Product::class;
			$args['graphql_single_name']              = 'Product';
			$args['graphql_plural_name']              = 'Products';
			$args['graphql_kind']                     = 'interface';
			$args['graphql_interfaces']               = [ 'ContentNode', 'ProductUnion' ];
			$args['graphql_register_root_field']      = false;
			$args['graphql_register_root_connection'] = false;
			$args['graphql_resolve_type']             = [ self::class, 'resolve_product_type' ];
			$args['graphql_exclude_mutations']        = [ 'create', 'delete', 'update' ];
		}//end if
		if ( 'product_variation' === $post_type ) {
			$args['show_in_graphql']                  = true;
			$args['model']                            = \WPGraphQL\WooCommerce\Model\Product_Variation::class;
			$args['graphql_single_name']              = 'ProductVariation';
			$args['graphql_plural_name']              = 'ProductVariations';
			$args['publicly_queryable']               = true;
			$args['graphql_kind']                     = 'interface';
			$args['graphql_interfaces']               = [
				'Node',
				'NodeWithFeaturedImage',
				'ContentNode',
				'ProductUnion',
				'UniformResourceIdentifiable',
				'ProductWithPricing',
				'ProductWithDimensions',
				'InventoriedProduct',
				'DownloadableProduct',
			];
			$args['graphql_register_root_field']      = false;
			$args['graphql_register_root_connection'] = false;
			$args['graphql_resolve_type']             = [ self::class, 'resolve_product_variation_type' ];
			$args['graphql_exclude_mutations']        = [ 'create', 'delete', 'update' ];
		}
		if ( 'shop_coupon' === $post_type ) {
			$args['show_in_graphql']            = true;
			$args['graphql_single_name']        = 'Coupon';
			$args['graphql_plural_name']        = 'Coupons';
			$args['publicly_queryable']         = true;
			$args['skip_graphql_type_registry'] = true;
		}
		if ( 'shop_order' === $post_type ) {
			$args['show_in_graphql']            = true;
			$args['graphql_single_name']        = 'Order';
			$args['graphql_plural_name']        = 'Orders';
			$args['skip_graphql_type_registry'] = true;
		}
		if ( 'shop_order_refund' === $post_type ) {
			$args['show_in_graphql']            = true;
			$args['graphql_single_name']        = 'Refund';
			$args['graphql_plural_name']        = 'Refunds';
			$args['skip_graphql_type_registry'] = true;
		}

		return $args;
	}

	/**
	 * Filters "allowed_post_types" and removed Woocommerce CPTs.
	 *
	 * @param array $post_types  Post types registered in GraphQL schema.
	 *
	 * @return array
	 */
	public static function skip_type_registry( $post_types ) {
		return array_diff(
			$post_types,
			get_post_types(
				[
					'show_in_graphql'            => true,
					'skip_graphql_type_registry' => true,
				]
			)
		);
	}

	/**
	 * Registers data-loaders to be used when resolving WooCommerce-related GraphQL types
	 *
	 * @param array $loaders  Assigned loaders.
	 *
	 * @return array
	 */
	public static function graphql_data_loader_classes( $loaders ) {
		// WooCommerce customer loader.
		$loaders['wc_customer'] = WC_Customer_Loader::class;

		// WooCommerce CPT loader.
		$loaders['wc_post'] = WC_CPT_Loader::class;

		// WooCommerce DB loaders.
		$loaders['cart_item']         = WC_Cart_Item_Loader::class;
		$loaders['downloadable_item'] = WC_Downloadable_Item_Loader::class;
		$loaders['tax_class']         = WC_Tax_Class_Loader::class;
		$loaders['tax_rate']          = WC_Tax_Rate_Loader::class;
		$loaders['order_item']        = WC_Order_Item_Loader::class;
		$loaders['shipping_method']   = WC_Shipping_Method_Loader::class;
		$loaders['shipping_zone']     = WC_Shipping_Zone_Loader::class;
		return $loaders;
	}

	/**
	 * Inject Union types that resolve to Product with Product types
	 *
	 * @param array                       $config    WPUnion config.
	 * @param \WPGraphQL\Type\WPUnionType $wp_union  WPUnion object.
	 *
	 * @return array
	 */
	public static function inject_union_types( $config, $wp_union ) {
		$refresh_callback = false;
		if ( in_array( 'Product', $config['typeNames'], true ) ) {
			// Strip 'Product' from config and child product types.
			$config['typeNames'] = array_merge(
				array_filter(
					$config['typeNames'],
					static function ( $type ) {
						return 'Product' !== $type;
					}
				),
				array_values( WooGraphQL::get_enabled_product_types() ),
				[ WooGraphQL::get_supported_product_type() ]
			);
			$refresh_callback    = true;
		}

		// Update 'types' callback.
		if ( $refresh_callback ) {
			$config['types'] = static function () use ( $config, $wp_union ) {
				$prepared_types = [];
				foreach ( $config['typeNames'] as $type_name ) {
					$prepared_types[] = $wp_union->type_registry->get_type( $type_name );
				}
				return $prepared_types;
			};
		}

		return $config;
	}

	/**
	 * Inject Union type resolver that resolve to Product with Product types
	 *
	 * @param \WPGraphQL\Type\WPObjectType $type      Type be resolve to.
	 * @param mixed                        $value     Object for which the type is being resolve config.
	 * @param \WPGraphQL\Type\WPUnionType  $wp_union  WPUnion object.
	 *
	 * @return \WPGraphQL\Type\WPObjectType
	 */
	public static function inject_union_type_resolver( $type, $value, $wp_union ) {
		switch ( get_class( $value ) ) {
			case 'WPGraphQL\WooCommerce\Model\Product':
			case 'WPGraphQL\WooCommerce\Model\Coupon':
			case 'WPGraphQL\WooCommerce\Model\Order':
				$new_type = Factory::resolve_node_type( $type, $value );
				if ( $new_type ) {
					$type = $wp_union->type_registry->get_type( $new_type );
				}
				break;
		}

		return $type;
	}

	/**
	 * Inject Union type resolver that resolve to Product with Product types
	 *
	 * @param \WPGraphQL\Type\WPObjectType|null $type   Type be resolve to.
	 * @param mixed                             $value  Object for which the type is being resolve config.
	 *
	 * @throws \GraphQL\Error\UserError Invalid product type received.
	 *
	 * @return \WPGraphQL\Type\WPObjectType|null
	 */
	public static function inject_type_resolver( $type, $value ) {

		$type_registry = \WPGraphQL::get_type_registry();
		switch ( $type ) {
			case 'Coupon':
			case 'Order':
				$new_type = Factory::resolve_node_type( $type, $value );
				if ( $new_type ) {
					$type = $type_registry->get_type( $new_type );
				}
				break;
			case 'ProductVariation':
				$type = self::resolve_product_variation_type( $value );
				break;
			case 'Product':
				$type = self::resolve_product_type( $value );
		}//end switch

		return $type;
	}

	/**
	 * Resolves GraphQL type for provided product model.
	 *
	 * @param \WPGraphQL\WooCommerce\Model\Product|\WPGraphQL\WooCommerce\Model\Product_Variation $value  Product model.
	 *
	 * @throws \GraphQL\Error\UserError Invalid product type requested.
	 *
	 * @return mixed
	 */
	public static function resolve_product_type( $value ) {
		$type_registry  = \WPGraphQL::get_type_registry();
		$possible_types = WooGraphQL::get_enabled_product_types();

		if ( $value instanceof \WPGraphQL\Model\Post && ( 'product' === $value->post_type || 'product_variation' === $value->post_type ) ) {
			$product_model = \WPGraphQL::get_app_context()
				->get_loader( 'wc_post' )
				->load( $value->ID );
		} elseif ( $value instanceof \WPGraphQL\Model\Post && ( 'product' !== $value->post_type && 'product_variation' !== $value->post_type ) ) {
			throw new UserError(
				sprintf(
					/* translators: %s: Post type slug */
					__( 'The "%s" post type is not a valid product type.', 'graphql-for-ecommerce' ),
					$value->post_type
				)
			);
		} else {
			$product_model = $value;
		}

		$product_type = $product_model->get_type();
		if ( isset( $possible_types[ $product_type ] ) ) {
			return $type_registry->get_type( $possible_types[ $product_type ] );
		} elseif ( $product_model instanceof \WPGraphQL\WooCommerce\Model\Product_Variation ) {
			return self::resolve_product_variation_type( $product_model );
		} elseif ( 'on' === woographql_setting( 'enable_unsupported_product_type', 'off' ) ) {
			$unsupported_type = WooGraphQL::get_supported_product_type();
			return $type_registry->get_type( $unsupported_type );
		}

		throw new UserError(
			sprintf(
			/* translators: %s: Product type */
				__( 'The "%s" product type is not supported by the core GraphQL for eCommerce schema.', 'graphql-for-ecommerce' ),
				$product_model->type
			)
		);
	}

	/**
	 * Resolves GraphQL type for provided product variation model.
	 *
	 * @param \WPGraphQL\WooCommerce\Model\Product_Variation $value  Product model.
	 *
	 * @throws \GraphQL\Error\UserError Invalid product type requested.
	 *
	 * @return mixed
	 */
	public static function resolve_product_variation_type( $value ) {
		$type_registry  = \WPGraphQL::get_type_registry();
		$possible_types = WooGraphQL::get_enabled_product_variation_types();

		// Normally $value is a Product_Variation model. In some setups the
		// variation node is loaded through the generic post loader (e.g. a cart
		// item's variation under Polylang, which doesn't manage the
		// product_variation post-type) and arrives as a base
		// \WPGraphQL\Model\Post with no get_type(). Fall back to resolving the
		// variation's product type from its ID.
		if ( is_callable( [ $value, 'get_type' ] ) ) {
			$product_type = $value->get_type();
		} else {
			$variation_id = $value->databaseId ?? ( $value->ID ?? 0 );
			$product      = $variation_id ? wc_get_product( $variation_id ) : false;
			$product_type = $product ? $product->get_type() : null;
		}

		if ( $product_type && isset( $possible_types[ $product_type ] ) ) {
			return $type_registry->get_type( $possible_types[ $product_type ] );
		}

		throw new UserError(
			sprintf(
			/* translators: %s: Product type */
				__( 'The "%s" product variation type is not supported by the core GraphQL for eCommerce schema.', 'graphql-for-ecommerce' ),
				$product_type ?? ''
			)
		);
	}

	/**
	 * Filter to make order notes visible in GraphQL queries for authorized users.
	 *
	 * @param bool   $is_private Whether the data is private.
	 * @param string $model_name The name of the model being checked.
	 * @param mixed  $data       The data being checked.
	 *
	 * @return bool
	 */
	public static function make_order_notes_visible( $is_private, $model_name, $data ) {
		// Only apply to Comment models.
		if ( 'CommentObject' !== $model_name ) {
			return $is_private;
		}

		// Check if this is an order note.
		if ( $data instanceof \WP_Comment && 'order_note' === $data->comment_type ) {
			// Get the parent order.
			$order_id = absint( $data->comment_post_ID );
			$order    = wc_get_order( $order_id );

			if ( ! $order ) {
				return true; // Keep it private if order not found.
			}

			// Allow shop managers and admins to see all order notes.
			if ( current_user_can( 'edit_shop_orders' ) ) {
				return false; // Not private.
			}

			// Allow customers to see customer notes on their own orders.
			$comment_id       = absint( $data->comment_ID );
			$is_customer_note = get_comment_meta( $comment_id, 'is_customer_note', true );
			if ( $is_customer_note && ! is_bool( $order ) && is_a( $order, \WC_Order::class ) ) {
				if ( get_current_user_id() === $order->get_customer_id() ) {
					return false; // Not private.
				}
			} elseif ( $is_customer_note && ! is_bool( $order ) && is_a( $order, \WC_Order_Refund::class ) ) {
				/** @var \WC_Order|false $parent */
				$parent = wc_get_order( $order->get_parent_id() );
				if ( $parent && get_current_user_id() === $parent->get_customer_id() ) {
					return false; // Not private.
				}
			}

			// Otherwise keep it private.
			return true;
		}

		return $is_private;
	}

	/**
	 * Filter to set order notes visibility to public for authorized users.
	 *
	 * @param string   $visibility   The visibility of the object.
	 * @param string   $model_name   The name of the model being checked.
	 * @param mixed    $data         The data being checked.
	 * @param int|null $owner        The owner of the object.
	 * @param \WP_User $current_user The current user.
	 *
	 * @return string
	 */
	public static function set_order_notes_visibility( $visibility, $model_name, $data, $owner, $current_user ) {
		// Only apply to Comment models.
		if ( 'CommentObject' !== $model_name ) {
			return $visibility;
		}

		// Check if this is an order note and if user owns the order.
		if ( $data instanceof \WP_Comment && 'order_note' === $data->comment_type ) {
			$order = wc_get_order( $data->comment_post_ID );

			// If user is the order owner, make it public.
			if ( $order && ! is_bool( $order ) && is_a( $order, \WC_Order::class ) ) {
				return get_current_user_id() === $order->get_customer_id() ? 'public' : $visibility;
			} elseif ( $order && ! is_bool( $order ) && is_a( $order, \WC_Order_Refund::class ) ) {
				/** @var \WC_Order|false $parent */
				$parent = wc_get_order( $order->get_parent_id() );
				return $parent && get_current_user_id() === $parent->get_customer_id() ? 'public' : $visibility;
			}
		}

		return $visibility;
	}
}