/**
 * 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';

export type UseInstalledPlugins = {
	installedPlugins: InstalledPlugin[];
	activatingPlugins: string[];
	activateInstalledPlugin: ( slug: string ) => void;
	loadInstalledPluginsAfterActivation: ( 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 useInstalledPlugins = (): UseInstalledPlugins => {
	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< InstalledPlugin[] >(),
			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 {
		installedPlugins: loading ? [] : installedPluginsWithoutChannels,
		activatingPlugins,
		activateInstalledPlugin,
		loadInstalledPluginsAfterActivation,
	};
};