import * as bodyParser from 'body-parser';
import * as cookieParser from 'cookie-parser';
import {join} from 'path'
import {Application, Express, Request, Response, NextFunction} from 'express'
import {resolve, serve} from './router-config';
import {AppRequest, AppResponse} from './types';
import {serverConfig} from './server-config';

export function configureRest(
    app: Application,
    express: any) {
  // session limit in seconds
  if (serverConfig.sessionAge) {
    app.set('sessionAge', app.get('sessionAge') || serverConfig.sessionAge || 60);
  }
  if (serverConfig.secret) {
    app.set('secret', app.get('secret') || serverConfig.secret);
  }
  if (serverConfig.useCookie) {
    app.set('cookiePath', serverConfig.cookiePath || app.get('cookiePath') || '/');
    app.set('httpOnly', serverConfig.cookiePath || app.get('httpOnly'));
    app.locals.cookieOptions = {
      path: app.get('cookiePath'),
      maxAge: app.get('cookiePath'),
      httpOnly: app.get('httpOnly'),
    };

    /**
     * Add parser to get/set cookies.
     */
    app.use(cookieParser());
  }

  /**
   * Set the public path fo the application
   */
  app.set('publicPath', serverConfig.publicPath || app.get('publicPath'));
  app.set('maxAge', serverConfig.maxAge || app.get('maxAge'));
  if (!app.get('publicPath')) {
    throw new Error('public path is missing');
  }
  app.use(express.static(app.get('publicPath'), {maxAge: app.get('maxAge')}));
  console.log(__dirname);

  /**
   * Define default headers for the application.
   */
  app.use((req: Request, res: Response, next: NextFunction) => {
    res.setHeader('Access-Control-Allow-Origin', serverConfig.controlOrigin);
    res.setHeader('Access-Control-Allow-Methods',
      serverConfig.allowMethods.join(', '));
    res.setHeader('Access-Control-Allow-Headers',
      'Content-Type,accept,access_token,X-Requested-With');
    res.setHeader('Date', (new Date()).toString());
    next();
  });

  /**
   * Initialize body parser for POST methods
   */
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));

  /**
   * Set the view path for ejs render
   */
  app.set('templatePath', serverConfig.templatePath || app.get('templatePath'));
  if (!app.get('templatePath')) {
    throw new Error('template path is missing');
  }
  app.set('view engine', 'ejs');
  app.set('views',  app.get('templatePath'));

  /**
   * Helper function to use with res.
   */
  app.use((req: Request, res: Response, next: NextFunction) => {
    resolve(req as AppRequest, res as AppResponse);
    serve(req as AppRequest, res as AppResponse);
    next();
  });
};