import { Injectable } from '@angular/core';

import { WebSocketService } from './websocket.service';
import { ProcessMessage } from '../message-types/process-message';
import { filter } from 'rxjs/operators';

@Injectable()
export class ProcessManagerService {
  process_name: string;

  constructor(private webSocketService: WebSocketService) {}

  init() {
    this.webSocketService.connect();
  }

  subscribeCallback(process_name: string, callback: (message: ProcessMessage) => void) {
    this.observeProcessMessage(process_name).subscribe(callback);
  }

  subscribeSuccessCallback(process_name: string, callback: (message: ProcessMessage) => void) {
    this.observeProcessMessage(process_name).pipe(filter(message => !('error' in message))).subscribe(callback);
  }

  subscribeErrorCallback(process_name: string, callback: (message: ProcessMessage) => void) {
    this.observeProcessMessage(process_name).pipe(filter(message => 'error' in message)).subscribe(callback);
  }

  observeProcessMessage(process_name: string) {
    return this.webSocketService.observeKey<ProcessMessage>('process')
      .pipe(filter(message => message.name === process_name));
  }

  startProcess(process_name: string) {
    this.sendCommand('start', process_name);
  }

  stopProcess(process_name: string) {
    this.sendCommand('stop', process_name);
  }

  restartProcess(process_name: string) {
    this.sendCommand('restart', process_name);
  }

  sendCommand(command: string, process_name: string) {
    this.webSocketService.sendJSON({
      'key': 'process.' + command,
      'name': process_name
    });
  }
}