<?php
/**
 * Mutation - addToCart
 *
 * Registers mutation for adding a cart item to the cart.
 *
 * @package WPGraphQL\WooCommerce\Mutation
 * @since 0.1.0
 */

namespace WPGraphQL\WooCommerce\Mutation;

use GraphQL\Error\UserError;
use GraphQL\Type\Definition\ResolveInfo;
use WPGraphQL\AppContext;
use WPGraphQL\WooCommerce\Data\Mutation\Cart_Mutation;

/**
 * Class - Cart_Add_Item
 */
class Cart_Add_Item {
	/**
	 * Registers mutation
	 *
	 * @return void
	 */
	public static function register_mutation() {
		register_graphql_mutation(
			'addToCart',
			[
				'inputFields'         => self::get_input_fields(),
				'outputFields'        => self::get_output_fields(),
				'mutateAndGetPayload' => self::mutate_and_get_payload(),
			]
		);
	}

	/**
	 * Defines the mutation input field configuration
	 *
	 * @return array
	 */
	public static function get_input_fields() {
		return [
			'productId'   => [
				'type'        => [ 'non_null' => 'Int' ],
				'description' => static function () {
					return __( 'Cart item product database ID or global ID', 'graphql-for-ecommerce' );
				},
			],
			'quantity'    => [
				'type'        => 'Int',
				'description' => static function () {
					return __( 'Cart item quantity', 'graphql-for-ecommerce' );
				},
			],
			'variationId' => [
				'type'        => 'Int',
				'description' => static function () {
					return __( 'Cart item product variation database ID or global ID', 'graphql-for-ecommerce' );
				},
			],
			'variation'   => [
				'type'        => [ 'list_of' => 'ProductAttributeInput' ],
				'description' => static function () {
					return __( 'Cart item product variation attributes', 'graphql-for-ecommerce' );
				},
			],
			'extraData'   => [
				'type'        => 'String',
				'description' => static function () {
					return __( 'JSON string representation of extra cart item data', 'graphql-for-ecommerce' );
				},
			],
		];
	}

	/**
	 * Defines the mutation output field configuration
	 *
	 * @return array
	 */
	public static function get_output_fields() {
		return [
			'cartItem' => [
				'type'    => 'CartItem',
				'resolve' => static function ( $payload ) {
					return \WC()->cart->get_cart_item( $payload['key'] );
				},
			],
			'cart'     => Cart_Mutation::get_cart_field( true ),
		];
	}

	/**
	 * Defines the mutation data modification closure.
	 *
	 * @return callable
	 */
	public static function mutate_and_get_payload() {
		return static function ( $input, AppContext $context, ResolveInfo $info ) {
			Cart_Mutation::check_session_token();

			// Prepare args for "add_to_cart" from input data.
			$cart_item_args = Cart_Mutation::prepare_cart_item( $input, $context, $info );

			// Add item to cart and get item key.
			try {
				$cart_item_key = \WC()->cart->add_to_cart( ...$cart_item_args );
			} catch ( \Throwable $e ) {
				// Repackage any errors.
				throw new UserError( $e->getMessage() );
			}

			// If cart item key valid return payload.
			if ( false !== $cart_item_key ) {
				return [ 'key' => $cart_item_key ];
			}

			// Process errors.
			$notices = \WC()->session->get( 'wc_notices' );
			if ( ! empty( $notices['error'] ) ) {
				$cart_error_messages = implode( ' ', array_column( $notices['error'], 'notice' ) );
				\wc_clear_notices();
				throw new UserError( $cart_error_messages );
			} else {
				throw new UserError( __( 'Failed to add cart item. Please check input.', 'graphql-for-ecommerce' ) );
			}
		};
	}
}