/**
 * External dependencies
 */
import { Component } from '@wordpress/element';
import { createHigherOrderComponent } from '@wordpress/compose';
import PropTypes from 'prop-types';
import { debounce } from 'lodash';

/**
 * Internal dependencies
 */
import { getAttributes, getTerms } from '@woocommerce/block-components/utils';
import { formatError } from '../base/utils/errors.js';

const withAttributes = createHigherOrderComponent( ( OriginalComponent ) => {
	class WrappedComponent extends Component {
		constructor() {
			super( ...arguments );
			this.state = {
				attributes: [],
				error: null,
				expandedAttribute: null,
				loading: false,
				termsList: {},
				termsLoading: false,
			};

			this.loadAttributes = this.loadAttributes.bind( this );
			this.onExpandAttribute = this.onExpandAttribute.bind( this );
			this.debouncedLoadTerms = debounce(
				this.loadTerms.bind( this ),
				200
			);
		}

		componentDidMount() {
			this.loadAttributes();
		}

		componentWillUnmount() {
			this.debouncedLoadTerms.cancel();
		}

		componentDidUpdate( prevProps, prevState ) {
			if (
				prevState.expandedAttribute !== this.state.expandedAttribute
			) {
				this.debouncedLoadTerms();
			}
		}

		loadAttributes() {
			const { selected } = this.props;
			const { expandedAttribute } = this.state;
			this.setState( { loading: true } );

			getAttributes()
				.then( ( attributes ) => {
					attributes = attributes.map( ( item ) => ( {
						...item,
						parent: 0,
					} ) );
					let newExpandedAttribute = expandedAttribute;
					if ( ! expandedAttribute && selected.length > 0 ) {
						const attr = attributes.find(
							( item ) => item.slug === selected[ 0 ].attr_slug
						);
						if ( attr ) {
							newExpandedAttribute = attr.id;
						}
					}
					this.setState( {
						attributes,
						expandedAttribute: newExpandedAttribute,
						loading: false,
						error: null,
					} );
				} )
				.catch( async ( e ) => {
					const error = await formatError( e );

					this.setState( {
						attributes: [],
						expandedAttribute: null,
						loading: false,
						error,
					} );
				} );
		}

		loadTerms() {
			const { expandedAttribute, termsList } = this.state;
			if ( ! expandedAttribute ) {
				return;
			}
			if ( ! termsList[ expandedAttribute ] ) {
				this.setState( { termsLoading: true } );
			}

			getTerms( expandedAttribute )
				.then( ( terms ) => {
					terms = terms.map( ( term ) => ( {
						...term,
						parent: expandedAttribute,
						attr_slug: term.attribute.slug,
					} ) );
					this.setState( ( prevState ) => ( {
						termsList: {
							...prevState.termsList,
							[ expandedAttribute ]: terms,
						},
						termsLoading: false,
					} ) );
				} )
				.catch( async ( e ) => {
					const error = await formatError( e );

					this.setState( {
						termsList: {},
						termsLoading: false,
						error,
					} );
				} );
		}

		onExpandAttribute( attributeId ) {
			const { expandedAttribute } = this.state;

			this.setState( {
				expandedAttribute:
					attributeId === expandedAttribute ? null : attributeId,
			} );
		}

		render() {
			const {
				error,
				expandedAttribute,
				loading,
				attributes,
				termsList,
				termsLoading,
			} = this.state;

			return (
				<OriginalComponent
					{ ...this.props }
					attributes={ attributes }
					error={ error }
					expandedAttribute={ expandedAttribute }
					onExpandAttribute={ this.onExpandAttribute }
					isLoading={ loading }
					termsAreLoading={ termsLoading }
					termsList={ termsList }
				/>
			);
		}
	}
	WrappedComponent.propTypes = {
		selected: PropTypes.array,
	};
	WrappedComponent.defaultProps = {
		selected: [],
	};
	return WrappedComponent;
}, 'withAttributes' );

export default withAttributes;