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 PORT = process.env.PORT || 4000;
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";

/*
// 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 counter =  new prom.Counter({
  name: 'explore',
  help: 'Explore Counter',
  labelNames: ['route'],
  registers: [register]
});

const histogram =  new prom.Histogram({
  name: 'exploreLatency',
  help: 'Explore Histogram',
  labelNames: ['route'],
  registers: [register],
  buckets: [0.5, 1, 2, 3, 4, 5]
});

app.engine('html', (_, options:RenderOptions, callback) => {
    let engine = ngExpressEngine({
        bootstrap: AppServerModuleNgFactory,
        providers: [
            { provide: 'request', useFactory: () => options.req, deps: [] },
            provideModuleMap(LAZY_MODULE_MAP)
        ]
    });
    engine(_, options, callback);
});

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});
      counter.inc({route: req.path});
      res.render('index', { req });
      res.on('finish', function() {
        end();
      });
    } else {
      res.render('index', { req });
    }
});

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