/**
 * External dependencies
 */
import { __ } from '@wordpress/i18n';
import { difference } from 'lodash';
import { useEffect, useState } from '@wordpress/element';
import { Stepper } from '@woocommerce/components';
import {
	OPTIONS_STORE_NAME,
	PLUGINS_STORE_NAME,
	SETTINGS_STORE_NAME,
} from '@woocommerce/data';
import { useSelect, select as wpDataSelect } from '@wordpress/data';

/**
 * Internal dependencies
 */
import { AUTOMATION_PLUGINS, SettingsSelector } from '../utils';
import { Connect } from './connect';
import { Plugins } from './plugins';
import { StoreLocation } from '../components/store-location';
import './setup.scss';

export type SetupProps = {
	isPending: boolean;
	onDisable: () => void;
	onAutomate: () => void;
	onManual: () => void;
};

export type SetupStepProps = {
	isPending: boolean;
	isResolving: boolean;
	nextStep: () => void;
	onDisable: () => void;
	onAutomate: () => void;
	onManual: () => void;
	pluginsToActivate: string[];
};

export const Setup: React.FC< SetupProps > = ( {
	isPending,
	onDisable,
	onAutomate,
	onManual,
} ) => {
	const [ pluginsToActivate, setPluginsToActivate ] = useState< string[] >(
		[]
	);
	const { activePlugins, isResolving } = useSelect(
		( select: typeof wpDataSelect ) => {
			const { getSettings } = select(
				SETTINGS_STORE_NAME
			) as SettingsSelector;
			const { hasFinishedResolution } = select(
				OPTIONS_STORE_NAME
			) as SettingsSelector;
			const { getActivePlugins } = select( PLUGINS_STORE_NAME );

			return {
				activePlugins: getActivePlugins(),
				generalSettings: getSettings( 'general' )?.general,
				isResolving:
					! hasFinishedResolution( 'getOption', [
						'woocommerce_setup_jetpack_opted_in',
					] ) ||
					! hasFinishedResolution( 'getOption', [
						'wc_connect_options',
					] ),
			};
		}
	);
	const [ stepIndex, setStepIndex ] = useState( 0 );

	useEffect( () => {
		const remainingPlugins = difference(
			AUTOMATION_PLUGINS,
			activePlugins
		);
		if ( remainingPlugins.length <= pluginsToActivate.length ) {
			return;
		}
		setPluginsToActivate( remainingPlugins );
	}, [ activePlugins ] );

	const nextStep = () => {
		setStepIndex( stepIndex + 1 );
	};

	const stepProps = {
		isPending,
		isResolving,
		onAutomate,
		onDisable,
		nextStep,
		onManual,
		pluginsToActivate,
	};

	const steps = [
		{
			key: 'store_location',
			label: __( 'Set store location', 'woocommerce' ),
			description: __(
				'The address from which your business operates',
				'woocommerce'
			),
			content: <StoreLocation { ...stepProps } />,
		},
		{
			key: 'plugins',
			label: pluginsToActivate.includes( 'woocommerce-services' )
				? __( 'Install Jetpack and WooCommerce Tax', 'woocommerce' )
				: __( 'Install Jetpack', 'woocommerce' ),
			description: __(
				'Jetpack and WooCommerce Tax allow you to automate sales tax calculations',
				'woocommerce'
			),
			content: <Plugins { ...stepProps } />,
		},
		{
			key: 'connect',
			label: __( 'Connect your store', 'woocommerce' ),
			description: __(
				'Connect your store to WordPress.com to enable automated sales tax calculations',
				'woocommerce'
			),
			content: <Connect { ...stepProps } />,
		},
	];

	const step = steps[ stepIndex ];

	return (
		<Stepper
			isPending={ isResolving }
			isVertical={ true }
			currentStep={ step.key }
			steps={ steps }
		/>
	);
};