import 'zone.js/dist/zone-node';
import 'reflect-metadata';
import {enableProdMode} from '@angular/core';

import * as express from 'express';
import {join} from 'path';
import {readFileSync} from 'fs';

// Faster server renders w/ Prod mode (dev mode never needed)
enableProdMode();

// Express server
const app = express();
const compression = require('compression');
app.use(compression());
const PORT = process.env.PORT || 3000;
const DIST_FOLDER = join(process.cwd(), 'dist');

// Our index.html we'll use as our template
const template = readFileSync(join(DIST_FOLDER, 'browser', 'index.html')).toString();

// * NOTE :: leave this as require() since this file is built Dynamically from webpack
const {AppServerModuleNgFactory, LAZY_MODULE_MAP} = require('./dist/server/main');

// Express Engine
import {ngExpressEngine, RenderOptions} from '@nguniversal/express-engine';
// Import module map for lazy loading
import {provideModuleMap} from '@nguniversal/module-map-ngfactory-loader';
import {routes} from "./routes";
import * as prom from "prom-client";
import {REQUEST, RESPONSE} from "@nguniversal/express-engine/tokens";
import {renderModuleFactory} from "@angular/platform-server";

/*
// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
    provideModuleMap(LAZY_MODULE_MAP)
  ]
}));
*/
// be able to get request and get domain from there

const register = new prom.Registry();

const responses = new prom.Counter({
  name: 'portal_http_responses_total',
  help: 'A counter for portal response codes for every existed or not existed pages.',
  labelNames: ['route', 'code'],
  registers: [register]
});

const histogram = new prom.Histogram({
  name: 'portal_http_request_duration_seconds',
  help: 'A Histogram for a portal. Providing information about page visits and load latency in seconds.',
  labelNames: ['route'],
  registers: [register],
  buckets: [0.1, 0.2, 0.5, 1, 2]
});

app.engine('html', (_, options: any, callback) => {
  const opts = {
    document: template,
    url: options.req.url,
    extraProviders: [
      provideModuleMap(LAZY_MODULE_MAP),
      {
        provide: REQUEST,
        useValue: options.req
      },
      {
        provide: RESPONSE,
        useValue: options.req.res,
      },
    ]
  };

  renderModuleFactory(AppServerModuleNgFactory, opts)
    .then(html => callback(null, html)
    );
});

app.set('view engine', 'html');
app.set('views', join(DIST_FOLDER, 'browser'));

/* - Example Express Rest API endpoints -
  app.get('/api/**', (req, res) => { });
*/

// Server static files from /browser
app.get('*.*', express.static(join(DIST_FOLDER, 'browser'), {
  maxAge: '1y'
}));

app.get('/metrics', (req, res) => {
  res.set('Content-Type', register.contentType);
  res.end(register.metrics());
});

// All regular routes use the Universal engine
app.get('*', (req, res) => {
  if (routes.indexOf(req.path) !== -1) {
    const end = histogram.startTimer({route: req.path});
    res.render('index', {req});
    res.on('finish', function () {
      responses.inc({route: req.path, code: res.statusCode});
      end();
    });
  } else {
    res.render('index', {req});
    res.on('finish', function () {
      responses.inc({route: '**', code: res.statusCode});
    });
  }
});

// Start up the Node server
app.listen(PORT, () => {
  console.log(`Node Express server listening on http://localhost:${PORT}`);
});