/** @format */
/**
 * External dependencies
 */
import apiFetch from '@wordpress/api-fetch';

/**
 * WooCommerce dependencies
 */
import { stringifyQuery } from '@woocommerce/navigation';

/**
 * Internal dependencies
 */
import { isResourcePrefix, getResourceIdentifier, getResourceName } from '../utils';
import { NAMESPACE } from '../constants';

function read( resourceNames, fetch = apiFetch ) {
	return [ ...readOrders( resourceNames, fetch ), ...readOrderQueries( resourceNames, fetch ) ];
}

function readOrderQueries( resourceNames, fetch ) {
	const filteredNames = resourceNames.filter( name => isResourcePrefix( name, 'order-query' ) );

	return filteredNames.map( async resourceName => {
		const query = getResourceIdentifier( resourceName );
		const url = `${ NAMESPACE }/orders${ stringifyQuery( query ) }`;

		try {
			const response = await fetch( {
				parse: false,
				path: url,
			} );

			const orders = await response.json();
			const totalCount = parseInt( response.headers.get( 'x-wp-total' ) );
			const ids = orders.map( order => order.id );
			const orderResources = orders.reduce( ( resources, order ) => {
				resources[ getResourceName( 'order', order.id ) ] = { data: order };
				return resources;
			}, {} );

			return {
				[ resourceName ]: {
					data: ids,
					totalCount,
				},
				...orderResources,
			};
		} catch ( error ) {
			return { [ resourceName ]: { error } };
		}
	} );
}

function readOrders( resourceNames, fetch ) {
	const filteredNames = resourceNames.filter( name => isResourcePrefix( name, 'order' ) );
	return filteredNames.map( resourceName => readOrder( resourceName, fetch ) );
}

function readOrder( resourceName, fetch ) {
	const id = getResourceIdentifier( resourceName );
	const url = `${ NAMESPACE }/orders/${ id }`;

	return fetch( { path: url } )
		.then( order => {
			return { [ resourceName ]: { data: order } };
		} )
		.catch( error => {
			return { [ resourceName ]: { error } };
		} );
}

export default {
	read,
};