/**
 * External dependencies
 */
import { useSelect, useDispatch } from '@wordpress/data';
import { chain } from 'lodash';

/**
 * Internal dependencies
 */
import { STORE_KEY } from '~/marketing/data/constants';
import { InstalledPlugin } from '~/marketing/types';
import { useRecommendedChannels } from './useRecommendedChannels';
import { useRegisteredChannels } from './useRegisteredChannels';

type InstalledExtension = InstalledPlugin;

export type UseInstalledExtensions = {
	installedExtensionsWithoutChannels: InstalledExtension[];
	activatingExtensions: string[];
	activateInstalledExtension: ( slug: string ) => void;
	loadInstalledExtensionsAfterActivation: ( slug: string ) => void;
};

/**
 * Hook to return plugins and methods for "Installed extensions" card.
 *
 * The list of installed plugins will not include registered and recommended marketing channels.
 */
export const useInstalledExtensions = (): UseInstalledExtensions => {
	const { loading: loadingRegisteredChannels, data: dataRegisteredChannels } =
		useRegisteredChannels();
	const {
		loading: loadingRecommendedChannels,
		data: dataRecommendedChannels,
	} = useRecommendedChannels();

	const { installedPlugins, activatingPlugins } = useSelect( ( select ) => {
		const { getInstalledPlugins, getActivatingPlugins } =
			select( STORE_KEY );

		return {
			installedPlugins: getInstalledPlugins< InstalledExtension[] >(),
			activatingPlugins: getActivatingPlugins(),
		};
	}, [] );

	const { activateInstalledPlugin, loadInstalledPluginsAfterActivation } =
		useDispatch( STORE_KEY );

	const loading = loadingRegisteredChannels || loadingRecommendedChannels;
	const installedPluginsWithoutChannels = chain( installedPlugins )
		.differenceWith(
			dataRegisteredChannels || [],
			( a, b ) => a.slug === b.slug
		)
		.differenceWith(
			dataRecommendedChannels || [],
			( a, b ) => a.slug === b.product
		)
		.value();

	return {
		installedExtensionsWithoutChannels: loading
			? []
			: installedPluginsWithoutChannels,
		activatingExtensions: activatingPlugins,
		activateInstalledExtension: activateInstalledPlugin,
		loadInstalledExtensionsAfterActivation:
			loadInstalledPluginsAfterActivation,
	};
};