/**
 * External dependencies
 */
import { useState, useEffect } from '@wordpress/element';
import { getAttributes, getTerms } from '@woocommerce/block-components/utils';
import { find } from 'lodash';

/**
 * Internal dependencies
 */
import { formatError } from '../base/utils/errors.js';

/**
 * Get attribute data (name, taxonomy etc) from server data.
 *
 * @param {number} attributeId Attribute ID to look for.
 * @param {Array} attributeList List of attributes.
 * @param {string} matchField Field to match on. e.g. id or slug.
 */
const getAttributeData = ( attributeId, attributeList, matchField = 'id' ) => {
	return attributeList
		? find( attributeList, [ matchField, attributeId ] )
		: null;
};

/**
 * HOC that calls the useAttributes hook.
 *
 * @param {Function} OriginalComponent Component being wrapped.
 */
const withAttributes = ( OriginalComponent ) => {
	return ( props ) => {
		const { selected } = props;
		const [ attributes, setAttributes ] = useState( [] );
		const [ expandedAttribute, setExpandedAttribute ] = useState( 0 );
		const [ termsList, setTermsList ] = useState( {} );
		const [ loading, setLoading ] = useState( true );
		const [ termsLoading, setTermsLoading ] = useState( false );
		const [ error, setError ] = useState( null );

		useEffect( () => {
			getAttributes()
				.then( ( newAttributes ) => {
					newAttributes = newAttributes.map( ( attribute ) => ( {
						...attribute,
						parent: 0,
					} ) );

					setAttributes( newAttributes );

					if ( selected.length > 0 ) {
						const selectedAttributeFromTerm = attributes
							? getAttributeData(
									selected[ 0 ].attr_slug,
									newAttributes,
									'slug'
							  )
							: null;

						if ( selectedAttributeFromTerm ) {
							setExpandedAttribute(
								selectedAttributeFromTerm.id
							);
						}
					}
				} )
				.catch( async ( e ) => {
					setError( await formatError( e ) );
				} )
				.finally( () => {
					setLoading( false );
				} );
		}, [] );

		useEffect( () => {
			const attributeData = attributes
				? getAttributeData( expandedAttribute, attributes )
				: null;

			if ( ! attributeData ) {
				return;
			}

			setTermsLoading( true );

			getTerms( expandedAttribute )
				.then( ( newTerms ) => {
					newTerms = newTerms.map( ( term ) => ( {
						...term,
						parent: expandedAttribute,
						attr_slug: attributeData.taxonomy,
					} ) );

					setTermsList( {
						...termsList,
						[ expandedAttribute ]: newTerms,
					} );
				} )
				.catch( async ( e ) => {
					setError( await formatError( e ) );
				} )
				.finally( () => {
					setTermsLoading( false );
				} );
		}, [ expandedAttribute, attributes ] );

		return (
			<OriginalComponent
				{ ...props }
				attributes={ attributes }
				error={ error }
				expandedAttribute={ expandedAttribute }
				onExpandAttribute={ setExpandedAttribute }
				isLoading={ loading }
				termsAreLoading={ termsLoading }
				termsList={ termsList }
			/>
		);
	};
};

export default withAttributes;