import 'zone.js/dist/zone-node';

import {ngExpressEngine} from '@nguniversal/express-engine';
import * as express from 'express';
import * as compression from 'compression';
import {join} from 'path';

import {AppServerModule} from './src/main.server';
import {APP_BASE_HREF} from '@angular/common';
import {existsSync} from 'fs';
import {REQUEST, RESPONSE} from "./src/app/openaireLibrary/utils/tokens";
import {isArray} from "util";

// The Express app is exported so that it can be used by serverless Functions.
export function app() {
  const server = express();
  server.use(compression());
  const distFolder = join(process.cwd(), 'dist/connect/browser');
  const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';
  
  // Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
  server.engine('html', ngExpressEngine({
    bootstrap: AppServerModule,
  }));
  
  server.set('view engine', 'html');
  server.set('views', distFolder);
  
  server.use(function (req, res, next) {
    var XFRAME_WHITELIST = [ 'http://spitoo.di.uoa.gr:5000/','http://scoobydoo.di.uoa.gr:5000/', 'https://beta.admin.connect.openaire.eu/','https://admin.connect.openaire.eu/'  ];
    let referer: string;
    if(req.headers.referer){
      referer = isArray(req.headers.referer)?req.headers.referer[0]:(<string>req.headers.referer);
      referer = referer.split("?")[0];
    }
    if (  referer &&  (XFRAME_WHITELIST.indexOf(referer) != -1 || referer.indexOf("/customize-layout") !=-1 || referer.indexOf(".d4science.org") != -1)) {
      // res.header('X-FRAME-OPTIONS', 'allow from ' +req.headers.referer);
    }else {
      res.header('X-FRAME-OPTIONS', 'SAMEORIGIN');
    }
    next();
  });
  
  // - Serve sitemap based on the host -
  server.get('/sitemap.xml', (req, res) => {
    let host = req.get("host").split(":")[0];
    let connectLinks= ["/","/about/learn-how","/about/learn-in-depth", "/about/faq","/search/find/communities"];
    let communityLinks= ["/","/search/find/research-outcomes?size=20","/search/advanced/research-outcomes?size=20","/participate/deposit/learn-how","/organizations", "/content"];
    let sitemap = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
      "<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\">";
    let urlPre = "<url>\n" +
      "    <loc>";
    let urlSuf = "</loc>\n" +
      "    </url>";
    for(let link of (host.indexOf("connect.openaire.eu") == -1 ?communityLinks:connectLinks)){
      sitemap += urlPre + "https://" + host + link + urlSuf;
    }
    sitemap += "\n</urlset>";
    res.setHeader('content-type', 'application/xml');
    res.send( sitemap);
  });
  
  // - Serve robots based on the host -
  server.get('/robots.txt', (req, res) => {
    let host = req.get("host").split(":")[0];
    let robots = "";
    if (host.indexOf(".openaire.eu") != -1 && host.indexOf("beta.") == -1) {
      //link to disallow
      let connectLinks = ["/about/*", "/search/find/communities"];
      let communityLinks = ["/search/advanced/*", "/participate/*",
        "/search/project", '/search/result', '/search/publication', '/search/dataset', '/search/software', '/search/other', '/search/dataprovider', '/search/organization', '/project-report',
        '/search/find/publications', '/search/find/datasets', '/search/find/software', '/search/find/other', '/search/find/projects', '/search/find/dataproviders', '/search/find/research-outcomes'
      
      ];
      robots = "User-Agent: *\n" +
        "Crawl-delay: 30\n" +
        "Sitemap: /sitemap.xml\n";
      for (let link of (host.indexOf("connect.openaire.eu") == -1 ? connectLinks : communityLinks)) {
        robots += "Disallow: " + link + "\n";
      }
    } else {
      robots = "User-Agent: *\n" +
        "Disallow: /\n"
    }
    res.setHeader('content-type', 'text/plain');
    res.send(robots);
  });
  
  // Example Express Rest API endpoints
  // server.get('/api/**', (req, res) => { });
  // Serve static files from /browser
  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));
  
  // All regular routes use the Universal engine
  server.get('*', (req, res) => {
    res.render(indexHtml, {
        req, providers: [
          {
            provide: APP_BASE_HREF,
            useValue: req.baseUrl
          },
          {
            provide: REQUEST, useValue: (req)
          },
          {
            provide: RESPONSE, useValue: (res)
          }
        ]
      }
    );
  });
  
  return server;
}

function run() {
  const port = process.env.PORT || 4000;
  
  // Start up the Node server
  const server = app();
  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
  run();
}

export * from './src/main.server';