import {Injectable} from "@angular/core";
import {Step} from "./step";

@Injectable()
export class InputComponentManagerService {
  private components: Step[] = [];

  public constructor() {
  }

  public register(component: Step): void {
    this.components.push(component);
  }

  public getAllComponents(): Step[] {
    return this.components;
  }

  public getNext(component: Step): Step {
    let index: number = component.index;
    if (index == this.components.length - 1) {
      this.addComponent();
    }
    return this.components[index + 1];
  }

  public getFirst(): Step {
    if (this.components.length == 0) {
      this.addComponent();
    }
    return this.components[0];
  }

  private addComponent(): void {
    this.register(new Step(this.components.length));
  }
}