import { ChangeDetectorRef, Component, OnInit } from '@angular/core';

import * as brace from 'brace';
import 'brace/ext/modelist';

import 'brace/mode/c_cpp';
import 'brace/mode/csharp';
import 'brace/mode/java';
import 'brace/mode/javascript';
import 'brace/mode/json';
import 'brace/mode/python';
import 'brace/mode/sql';

import 'brace/theme/cobalt';
import { SourceCode } from './source-code';
import { WebSocketService } from '../services/websocket.service';
import { ProcessManagerService } from '../services/processmanager.service';
import { DeploymentNotificationService } from '../services/deployment-notification.service';
import { config } from '../config';

const modelist = brace.acequire('ace/ext/modelist');

@Component({
  selector: 'app-webide',
  templateUrl: './webide.component.html',
  styleUrls: ['./webide.component.scss']
})
export class WebideComponent implements OnInit {
  key_id = 'webide';
  filename = '';
  code: string = config.webide.defaultCode;
  language: string = config.webide.defaultLanguage;
  theme = 'cobalt';
  directory = '';
  files: string[];
  codeState = 'SAVED';
  deployButtonState = 'DEPLOYED';
  showDeployButton: boolean = config.webide.showDeployButton;
  autosave = null;
  command_handlers = {'reload':    this.reloadHandler.bind(this),
                      'read':      this.readHandler.bind(this),
                      'select':    this.selectHandler.bind(this),
                      'write':     this.writeHandler.bind(this),
                      'selectdir': this.selectdirHandler.bind(this)};

  constructor(private webSocketService: WebSocketService,
              private changeDetectorRef: ChangeDetectorRef,
              private processManagerService: ProcessManagerService,
              private deploymentNotificationService: DeploymentNotificationService) { }

  ngOnInit() {
    this.webSocketService.connect();
    this.subscribeWS();
    this.requestCode();
    this.processManagerService.init();
    this.processManagerService.subscribeCallback(config.webide.deployProcessName, (event) => { this.setDeployButtonState('DEPLOYED'); });
    this.processManagerService.subscribeErrorCallback(config.webide.deployProcessName, (event) => { this.setDeployButtonState('FAILED'); });
    this.resetAutoSaveCountdown();
  }

  subscribeWS() {
    this.webSocketService.observeKey<SourceCode>(this.key_id).subscribe((event) => {
      this.command_handlers[event.data.command](event.data);
      this.changeDetectorRef.detectChanges();
    });
  }

  updateFileData(data: SourceCode) {
    this.filename = data.filename;
    this.directory = data.directory;
    this.code = (data.content != null) ? data.content : this.code;
    this.language = modelist.getModeForPath(this.filename).name;
    this.files = data.files;
  }

  selectHandler(data: SourceCode) {
    this.updateFileData(data);
  }

  reloadHandler(data: SourceCode) {
    this.requestCode();
  }

  readHandler(data: SourceCode) {
    if (this.codeState == 'SAVED') {
      this.updateFileData(data);
    }
  }

  writeHandler() {
    this.setCodeState('SAVED');
  }

  selectdirHandler(data: SourceCode) {
    this.updateFileData(data);
  }

  resetAutoSaveCountdown() {
    if (this.autosave) {
      clearInterval(this.autosave);
    }
    this.autosave = setInterval(() => { this.sendCodeIfDirty(); }, config.webide.autoSaveInterval);
  }

  tabSwitchButtonHandler(file) {
    if (this.codeState === 'DIRTY') {
      this.sendCodeContents();
    }
    this.selectCode(file);
    this.requestCode();
  }

  setCodeState(state: string) {
    if (state.match('SAVED|DIRTY')) {
      this.codeState = state;
    }
  }

  setDeployButtonState(state: string) {
    this.deployButtonState = state;
    this.deploymentNotificationService.deploying.next(state === 'DEPLOYING' ? true : false);
  }

  deployCode() {
    this.processManagerService.restartProcess('login');
    this.setDeployButtonState('DEPLOYING');
  }

  sendCodeIfDirty() {
    if (this.codeState === 'DIRTY') {
      this.sendCodeContents();
    }
  }

  sendCodeContents() {
    this.webSocketService.send(this.key_id, {
      'command': 'write',
      'content': this.code
    });
  }

  requestCode() {
    this.webSocketService.send(this.key_id, {
      'command': 'read'
    });
  }

  selectCode(filename: string) {
    this.webSocketService.send(this.key_id, {
      'command': 'select',
      'filename': filename
    });
  }
}