import { AppStatusUtils } from '@rocket.chat/apps-engine/definition/AppStatus';

import { SystemLogger } from '../../../../server/lib/logger/system';
import notifications from '../../../notifications/server/lib/Notifications';

export const AppEvents = Object.freeze({
	APP_ADDED: 'app/added',
	APP_REMOVED: 'app/removed',
	APP_UPDATED: 'app/updated',
	APP_STATUS_CHANGE: 'app/statusUpdate',
	APP_SETTING_UPDATED: 'app/settingUpdated',
	COMMAND_ADDED: 'command/added',
	COMMAND_DISABLED: 'command/disabled',
	COMMAND_UPDATED: 'command/updated',
	COMMAND_REMOVED: 'command/removed',
	ACTIONS_CHANGED: 'actions/changed',
});

export class AppServerListener {
	constructor(orch, engineStreamer, clientStreamer, received) {
		this.orch = orch;
		this.engineStreamer = engineStreamer;
		this.clientStreamer = clientStreamer;
		this.received = received;

		this.engineStreamer.on(AppEvents.APP_STATUS_CHANGE, this.onAppStatusUpdated.bind(this));
		this.engineStreamer.on(AppEvents.APP_REMOVED, this.onAppRemoved.bind(this));
		this.engineStreamer.on(AppEvents.APP_UPDATED, this.onAppUpdated.bind(this));
		this.engineStreamer.on(AppEvents.APP_ADDED, this.onAppAdded.bind(this));
		this.engineStreamer.on(AppEvents.ACTIONS_CHANGED, this.onActionsChanged.bind(this));

		this.engineStreamer.on(AppEvents.APP_SETTING_UPDATED, this.onAppSettingUpdated.bind(this));
		this.engineStreamer.on(AppEvents.COMMAND_ADDED, this.onCommandAdded.bind(this));
		this.engineStreamer.on(AppEvents.COMMAND_DISABLED, this.onCommandDisabled.bind(this));
		this.engineStreamer.on(AppEvents.COMMAND_UPDATED, this.onCommandUpdated.bind(this));
		this.engineStreamer.on(AppEvents.COMMAND_REMOVED, this.onCommandRemoved.bind(this));
	}

	async onAppAdded(appId) {
		await this.orch.getManager().loadOne(appId);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_ADDED, appId);
	}

	async onAppStatusUpdated({ appId, status }) {
		const app = this.orch.getManager().getOneById(appId);

		if (!app || app.getStatus() === status) {
			return;
		}

		this.received.set(`${AppEvents.APP_STATUS_CHANGE}_${appId}`, {
			appId,
			status,
			when: new Date(),
		});

		if (AppStatusUtils.isEnabled(status)) {
			await this.orch.getManager().enable(appId).catch(SystemLogger.error);
			this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_STATUS_CHANGE, { appId, status });
		} else if (AppStatusUtils.isDisabled(status)) {
			await this.orch.getManager().disable(appId, status, true).catch(SystemLogger.error);
			this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_STATUS_CHANGE, { appId, status });
		}
	}

	async onAppSettingUpdated({ appId, setting }) {
		this.received.set(`${AppEvents.APP_SETTING_UPDATED}_${appId}_${setting.id}`, {
			appId,
			setting,
			when: new Date(),
		});
		await this.orch.getManager().getSettingsManager().updateAppSetting(appId, setting);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_SETTING_UPDATED, { appId });
	}

	async onAppUpdated(appId) {
		this.received.set(`${AppEvents.APP_UPDATED}_${appId}`, { appId, when: new Date() });

		const storageItem = await this.orch.getStorage().retrieveOne(appId);

		const appPackage = await this.orch.getAppSourceStorage().fetch(storageItem);

		await this.orch.getManager().updateLocal(storageItem, appPackage);

		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_UPDATED, appId);
	}

	async onAppRemoved(appId) {
		const app = this.orch.getManager().getOneById(appId);

		if (!app) {
			return;
		}

		await this.orch.getManager().removeLocal(appId);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_REMOVED, appId);
	}

	async onCommandAdded(command) {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_ADDED, command);
	}

	async onCommandDisabled(command) {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_DISABLED, command);
	}

	async onCommandUpdated(command) {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_UPDATED, command);
	}

	async onCommandRemoved(command) {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_REMOVED, command);
	}

	async onActionsChanged() {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.ACTIONS_CHANGED);
	}
}

export class AppServerNotifier {
	constructor(orch) {
		this.engineStreamer = notifications.streamAppsEngine;

		// This is used to broadcast to the web clients
		this.clientStreamer = notifications.streamApps;

		this.received = new Map();
		this.listener = new AppServerListener(orch, this.engineStreamer, this.clientStreamer, this.received);
	}

	async appAdded(appId) {
		this.engineStreamer.emit(AppEvents.APP_ADDED, appId);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_ADDED, appId);
	}

	async appRemoved(appId) {
		this.engineStreamer.emit(AppEvents.APP_REMOVED, appId);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_REMOVED, appId);
	}

	async appUpdated(appId) {
		if (this.received.has(`${AppEvents.APP_UPDATED}_${appId}`)) {
			this.received.delete(`${AppEvents.APP_UPDATED}_${appId}`);
			return;
		}

		this.engineStreamer.emit(AppEvents.APP_UPDATED, appId);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_UPDATED, appId);
	}

	async appStatusUpdated(appId, status) {
		if (this.received.has(`${AppEvents.APP_STATUS_CHANGE}_${appId}`)) {
			const details = this.received.get(`${AppEvents.APP_STATUS_CHANGE}_${appId}`);
			if (details.status === status) {
				this.received.delete(`${AppEvents.APP_STATUS_CHANGE}_${appId}`);
				return;
			}
		}

		this.engineStreamer.emit(AppEvents.APP_STATUS_CHANGE, { appId, status });
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_STATUS_CHANGE, { appId, status });
	}

	async appSettingsChange(appId, setting) {
		if (this.received.has(`${AppEvents.APP_SETTING_UPDATED}_${appId}_${setting.id}`)) {
			this.received.delete(`${AppEvents.APP_SETTING_UPDATED}_${appId}_${setting.id}`);
			return;
		}

		this.engineStreamer.emit(AppEvents.APP_SETTING_UPDATED, { appId, setting });
		this.clientStreamer.emitWithoutBroadcast(AppEvents.APP_SETTING_UPDATED, { appId });
	}

	async commandAdded(command) {
		this.engineStreamer.emit(AppEvents.COMMAND_ADDED, command);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_ADDED, command);
	}

	async commandDisabled(command) {
		this.engineStreamer.emit(AppEvents.COMMAND_DISABLED, command);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_DISABLED, command);
	}

	async commandUpdated(command) {
		this.engineStreamer.emit(AppEvents.COMMAND_UPDATED, command);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_UPDATED, command);
	}

	async commandRemoved(command) {
		this.engineStreamer.emit(AppEvents.COMMAND_REMOVED, command);
		this.clientStreamer.emitWithoutBroadcast(AppEvents.COMMAND_REMOVED, command);
	}

	async actionsChanged() {
		this.clientStreamer.emitWithoutBroadcast(AppEvents.ACTIONS_CHANGED);
	}
}