import { Injectable, EventEmitter } from '@angular/core';
import { Node } from '../cartography/models/node';
import { Subject } from 'rxjs';

@Injectable()
export class NodeConsoleService {
  public nodeConsoleTrigger = new EventEmitter<Node>();
  public closeNodeConsoleTrigger = new Subject<Node>();
  public consoleResized = new Subject<ConsoleResizedEvent>();
  public openConsoles: number = 0;

  public readonly defaultConsoleWidth = 720;
  public readonly defaultConsoleHeight = 408;

  public readonly defaultNumberOfColumns = 80;
  public readonly defaultNumberOfRows = 24;

  private lastNumberOfColumns: number;
  private lastNumberOfRows: number;

  constructor() {}

  getNumberOfColumns() {
    return this.lastNumberOfColumns;
  }

  getNumberOfRows() {
    return this.lastNumberOfRows;
  }

  setNumberOfColumns(value: number) {
    this.lastNumberOfColumns = value;
  }

  setNumberOfRows(value: number) {
    this.lastNumberOfRows = value;
  }

  openConsoleForNode(node: Node) {
    this.nodeConsoleTrigger.emit(node);
  }

  closeConsoleForNode(node: Node) {
    this.closeNodeConsoleTrigger.next(node);
  }

  resizeTerminal(event: ConsoleResizedEvent) {
    this.consoleResized.next(event);
  }

  getLineWidth() {
    return this.defaultConsoleWidth / this.defaultNumberOfColumns;
  }

  getLineHeight() {
    return this.defaultConsoleHeight / this.defaultNumberOfRows;
  }
}

export interface ConsoleResizedEvent {
  width: number,
  height: number
}