import _Vue from "vue";
import {
	ITelemetrySettings,
	ITelemetryTrackProperties,
	IDataObject,
} from 'n8n-workflow';
import { Route } from "vue-router";

import type { INodeCreateElement, IRootState } from "@/Interface";
import type { Store } from "vuex";
import type { IUserNodesPanelSession } from "./telemetry.types";

export function TelemetryPlugin(vue: typeof _Vue): void {
	const telemetry = new Telemetry();

	Object.defineProperty(vue, '$telemetry', {
		get() { return telemetry; },
	});
	Object.defineProperty(vue.prototype, '$telemetry', {
		get() { return telemetry; },
	});
}

export class Telemetry {

	private pageEventQueue: Array<{route: Route}>;
	private previousPath: string;
	private store: Store<IRootState> | null;

	private get rudderStack() {
		return window.rudderanalytics;
	}

	private userNodesPanelSession: IUserNodesPanelSession = {
		sessionId: '',
		data: {
			nodeFilter: '',
			resultsNodes: [],
			filterMode: 'Regular',
		},
	};

	constructor() {
		this.pageEventQueue = [];
		this.previousPath = '';
		this.store = null;
	}

	init(
		telemetrySettings: ITelemetrySettings,
		{ instanceId, userId, store }: {
			instanceId: string;
			userId?: string;
			store: Store<IRootState>;
	 },
	) {
		if (!telemetrySettings.enabled || !telemetrySettings.config || this.rudderStack) return;

		const { config: { key, url } } = telemetrySettings;

		this.store = store;

		const logLevel = store.getters['settings/logLevel'];

		const logging = logLevel === 'debug' ? { logLevel: 'DEBUG' } : {};

		this.initRudderStack(
			key,
			url,
			{
				integrations: { All: false },
				loadIntegration: false,
				...logging,
			},
		);

		this.identify(instanceId, userId);

		this.flushPageEvents();
		this.track('Session started', { session_id: store.getters.sessionId });
	}

	identify(instanceId: string, userId?: string) {
		const traits = { instance_id: instanceId };
		if (userId) {
			this.rudderStack.identify(`${instanceId}#${userId}`, traits);
		}
		else {
			this.rudderStack.reset();
			this.rudderStack.identify(undefined, traits);
		}
	}

	track(event: string, properties?: ITelemetryTrackProperties) {
		if (!this.rudderStack) return;

		const updatedProperties = {
			...properties,
			version_cli: this.store && this.store.getters.versionCli,
		};

		this.rudderStack.track(event, updatedProperties);
	}

	page(route: Route) {
		if (this.rudderStack)	{
			if (route.path === this.previousPath) { // avoid duplicate requests query is changed for example on search page
				return;
			}
			this.previousPath = route.path;

			const pageName = route.name;
			let properties: {[key: string]: string} = {};
			if (this.store && route.meta && route.meta.telemetry && typeof route.meta.telemetry.getProperties === 'function') {
				properties = route.meta.telemetry.getProperties(route, this.store);
			}

			const category = (route.meta && route.meta.telemetry && route.meta.telemetry.pageCategory) || 'Editor';
			this.rudderStack.page(category, pageName!, properties);
		}
		else {
			this.pageEventQueue.push({
				route,
			});
		}
	}

	flushPageEvents() {
		const queue = this.pageEventQueue;
		this.pageEventQueue = [];
		queue.forEach(({route}) => {
			this.page(route);
		});
	}

	trackNodesPanel(event: string, properties: IDataObject = {}) {
		if (this.rudderStack) {
			properties.nodes_panel_session_id = this.userNodesPanelSession.sessionId;
			switch (event) {
				case 'nodeView.createNodeActiveChanged':
					if (properties.createNodeActive !== false) {
						this.resetNodesPanelSession();
						properties.nodes_panel_session_id = this.userNodesPanelSession.sessionId;
						this.track('User opened nodes panel', properties);
					}
					break;
				case 'nodeCreateList.selectedTypeChanged':
					this.userNodesPanelSession.data.filterMode = properties.new_filter as string;
					this.track('User changed nodes panel filter', properties);
					break;
				case 'nodeCreateList.destroyed':
					if(this.userNodesPanelSession.data.nodeFilter.length > 0 && this.userNodesPanelSession.data.nodeFilter !== '') {
						this.track('User entered nodes panel search term', this.generateNodesPanelEvent());
					}
					break;
				case 'nodeCreateList.nodeFilterChanged':
					if((properties.newValue as string).length === 0 && this.userNodesPanelSession.data.nodeFilter.length > 0) {
						this.track('User entered nodes panel search term', this.generateNodesPanelEvent());
					}

					if((properties.newValue as string).length > (properties.oldValue as string || '').length) {
						this.userNodesPanelSession.data.nodeFilter = properties.newValue as string;
						this.userNodesPanelSession.data.resultsNodes = ((properties.filteredNodes || []) as INodeCreateElement[]).map((node: INodeCreateElement) => node.key);
					}
					break;
				case 'nodeCreateList.onCategoryExpanded':
					properties.is_subcategory = false;
					this.track('User viewed node category', properties);
					break;
				case 'nodeCreateList.onSubcategorySelected':
					const selectedProperties = (properties.selected as IDataObject).properties as IDataObject;
					if(selectedProperties && selectedProperties.subcategory) {
						properties.category_name = selectedProperties.subcategory;
					}
					properties.is_subcategory = true;
					delete properties.selected;
					this.track('User viewed node category', properties);
					break;
				case 'nodeView.addNodeButton':
					this.track('User added node to workflow canvas', properties);
					break;
				case 'nodeView.addSticky':
					this.track('User inserted workflow note', properties);
					break;
				default:
					break;
			}
		}
	}

	private resetNodesPanelSession() {
		this.userNodesPanelSession.sessionId = `nodes_panel_session_${(new Date()).valueOf()}`;
		this.userNodesPanelSession.data = {
			nodeFilter: '',
			resultsNodes: [],
			filterMode: 'All',
		};
	}

	private generateNodesPanelEvent() {
		return {
			search_string: this.userNodesPanelSession.data.nodeFilter,
			results_count: this.userNodesPanelSession.data.resultsNodes.length,
			filter_mode: this.userNodesPanelSession.data.filterMode,
			nodes_panel_session_id: this.userNodesPanelSession.sessionId,
		};
	}

	private initRudderStack(key: string, url: string, options: IDataObject) {
		window.rudderanalytics = window.rudderanalytics || [];

		this.rudderStack.methods = [
			"load",
			"page",
			"track",
			"identify",
			"alias",
			"group",
			"ready",
			"reset",
			"getAnonymousId",
			"setAnonymousId",
		];

		this.rudderStack.factory = (method: string) => {
			return (...args: unknown[]) => {
				const argsCopy = [method, ...args];
				this.rudderStack.push(argsCopy);

				return this.rudderStack;
			};
		};

		for (const method of this.rudderStack.methods) {
			this.rudderStack[method] = this.rudderStack.factory(method);
		}

		this.rudderStack.loadJS = () => {
			const script = document.createElement("script");

			script.type = "text/javascript";
			script.async = !0;
			script.src = "https://cdn.rudderlabs.com/v1/rudder-analytics.min.js";

			const element: Element = document.getElementsByTagName("script")[0];

			if (element && element.parentNode) {
				element.parentNode.insertBefore(script, element);
			}
		};

		this.rudderStack.loadJS();
		this.rudderStack.load(key, url, options);
	}
}