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import 'zone.js/dist/zone-node';
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import 'reflect-metadata';
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import { renderModuleFactory } from '@angular/platform-server';
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import { enableProdMode } from '@angular/core';
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import * as express from 'express';
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import { join } from 'path';
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import { readFileSync } from 'fs';
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// Faster server renders w/ Prod mode (dev mode never needed)
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enableProdMode();
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// Express server
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const app = express();
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const PORT = process.env.PORT || 4000;
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const DIST_FOLDER = join(process.cwd(), 'dist');
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// Our index.html we'll use as our template
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const template = readFileSync(join(DIST_FOLDER, 'browser', 'index.html')).toString();
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// * NOTE :: leave this as require() since this file is built Dynamically from webpack
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const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('./dist/server/main');
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// Express Engine
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import {ngExpressEngine, RenderOptions} from '@nguniversal/express-engine';
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// Import module map for lazy loading
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import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';
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import {REQUEST, RESPONSE} from "@nguniversal/express-engine/tokens";
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import {isArray} from "util";
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// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
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// app.engine('html', ngExpressEngine({
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//   bootstrap: AppServerModuleNgFactory,
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//   providers: [
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//      { provide: 'request', useFactory: () => options.req, deps: [] },
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//     provideModuleMap(LAZY_MODULE_MAP)
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//   ]
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// }));
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// be able to get request and get domain from there
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app.engine('html', (_, options: any, callback) => {
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  const opts = {
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    document: template,
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    url: options.req.url,
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    extraProviders: [
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      provideModuleMap(LAZY_MODULE_MAP),
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      {
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        provide: REQUEST,
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        useValue: options.req
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      },
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      {
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        provide: RESPONSE,
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        useValue: options.req.res,
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      },
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    ]
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  };
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  renderModuleFactory(AppServerModuleNgFactory, opts)
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    .then(html => callback(null, html)
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    );
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});
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app.set('view engine', 'html');
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app.set('views', join(DIST_FOLDER, 'browser'));
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// Allow frames from specific domains
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app.use(function (req, res, next) {
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  var XFRAME_WHITELIST = [ 'http://scoobydoo.di.uoa.gr:5000/customize-layout', 'https://beta.admin.connect.openaire.eu/customize-layout','https://admin.connect.openaire.eu/customize-layout'  ];
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  let referer: string;
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  if(req.headers.referer){
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    referer = isArray(req.headers.referer)?req.headers.referer[0]:(<string>req.headers.referer);
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    referer = referer.split("?")[0];
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  }
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  if (  referer &&  (XFRAME_WHITELIST.indexOf(referer) != -1  || referer.indexOf(".d4science.org") != -1)) {
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    // res.header('X-FRAME-OPTIONS', 'allow from ' +req.headers.referer);
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  }else {
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    res.header('X-FRAME-OPTIONS', 'SAMEORIGIN');
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  }
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  next();
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});
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 // - Serve sitemap based on the host -
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  app.get('/sitemap.xml', (req, res) => {
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    let host = req.get("host").split(":")[0];
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    let connectLinks= ["/","/about/learn-how","/about/learn-in-depth", "/about/faq","/search/find/communities"];
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    let communityLinks= ["/","/search/find/research-outcomes?size=20","/search/advanced/research-outcomes?size=20","/participate/deposit/learn-how","/organizations", "/content"];
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    let sitemap = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
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      "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd\">";
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    let urlPre = "<url>\n" +
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      "    <loc>";
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    let urlSuf = "</loc>\n" +
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      "    </url>";
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    for(let link of (host.indexOf("connect.openaire.eu") == -1 ?communityLinks:connectLinks)){
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      sitemap += urlPre + "https://" + host + link + urlSuf;
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     }
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    sitemap += "\n</urlset>";
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    res.setHeader('content-type', 'application/xml');
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    res.send( sitemap);
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  });
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app.get('/robots.txt', (req, res) => {
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  let host = req.get("host").split(":")[0];
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  let robots = "";
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  if(host.indexOf(".openaire.eu") != -1 && host.indexOf("beta.") == -1 ){
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    //link to disallow
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    let connectLinks= ["/about/*","/search/find/communities"];
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    let communityLinks= ["/search/advanced/*","/participate/*",
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      "/search/project",'/search/result', '/search/publication', '/search/dataset','/search/software','/search/other','/search/dataprovider','/search/organization','/project-report',
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      '/search/find/publications','/search/find/datasets','/search/find/software','/search/find/other','/search/find/projects','/search/find/dataproviders','/search/find/research-outcomes'
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    ];
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    robots = "User-Agent: *\n"+
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    "Crawl-delay: 30\n" +
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      "Sitemap: /sitemap.xml\n";
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    for(let link of (host.indexOf("connect.openaire.eu") == -1 ?connectLinks:communityLinks)){
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      robots +=  "Disallow: " + link +  "\n";
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    }
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  }else{
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    robots = "User-Agent: *\n" +
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      "Disallow: /\n"
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  }
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  res.setHeader('content-type', 'text/plain');
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  res.send( robots);
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});
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/* - Example Express Rest API endpoints -
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  app.get('/api/**', (req, res) => { });
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*/
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// Server static files from /browser
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app.get('*.*', express.static(join(DIST_FOLDER, 'browser'), {
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  maxAge: '1y'
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}));
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// ALl regular routes use the Universal engine
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app.get('*', (req, res) => {
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  res.render('index', { req });
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});
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// Start up the Node server
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app.listen(PORT, () => {
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  console.log(`Node Express server listening on http://localhost:${PORT}`);
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});
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