/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { Component, OnInit, ElementRef, ViewEncapsulation, ViewChild, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import { ActivatedRoute } from '@angular/router';
import Guacamole from 'guacamole-common-js';

import { environment } from '../../environments/environment';

// we can now access environment.apiUrl
const API_URL = environment.apiUrl;

import { StorageService } from '../core/services';

@Component({
  selector: 'datalab-webterminal',
  templateUrl: './webterminal.component.html',
  styleUrls: ['./webterminal.component.scss'],
  encapsulation: ViewEncapsulation.None
})
export class WebterminalComponent implements OnInit {
  public id: string;
  public endpoint: string;
  public state: string = '';
  public layer;
  @ViewChild('terminal', { read: ElementRef }) terminal: ElementRef;
  @ViewChild('clip', { static: true }) clip;


  constructor(
    private route: ActivatedRoute,
    private storageService: StorageService,
    @Inject(DOCUMENT) private document) {
  }

  ngOnInit() {
    this.id = this.route.snapshot.paramMap.get('id');
    this.endpoint = this.route.snapshot.paramMap.get('endpoint');
    this.open(this.id, this.endpoint);
  }

  public open(id_parameter: string, endpoint_parameter: string) {
    // added to simplify development process
    const url = environment.production ? window.location.origin : API_URL;
    const tunnel = new Guacamole.HTTPTunnel(
      `${url}/api/tunnel`, false,
      { 'DataLab-Authorization': `Bearer ${this.storageService.getToken()}` }
    );

    const guac = new Guacamole.Client(tunnel);
    const display = document.getElementById('display');

    display.appendChild(guac.getDisplay().getElement());
    this.layer = guac.getDisplay().getDefaultLayer();

    guac.connect(`{"host" : "${id_parameter}", "endpoint" : "${endpoint_parameter}"}`);

    // Error handler
    guac.onerror = (error) => console.log(error.message);
    window.onunload = () => guac.disconnect();

    // Mouse
    const mouse = new Guacamole.Mouse(guac.getDisplay().getElement());
    mouse.onmousemove = (mouseState) => {
      // if (navigator.userAgent.indexOf('Firefox') === -1) {
      //   mouseState.x = mouseState.x + 125;
      //   mouseState.y = mouseState.y + 65;
      // }
      guac.sendMouseState(mouseState);
    };

    const keyboard = new Guacamole.Keyboard(document);
    keyboard.onkeydown = (keysym) => guac.sendKeyEvent(1, keysym);
    keyboard.onkeyup = (keysym) => guac.sendKeyEvent(0, keysym);
  }
}