import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';

export interface Toast {
  message: string;
  type: 'success' | 'error';
}

@Injectable({ providedIn: 'root' })
export class ToastService {
  private readonly subject = new BehaviorSubject<Toast | null>(null);
  readonly current$: Observable<Toast | null> = this.subject.asObservable();
  private timer: ReturnType<typeof setTimeout> | null = null;

  show(message: string, type: 'success' | 'error' = 'success', duration = 3000): void {
    if (this.timer !== null) {
      clearTimeout(this.timer);
    }
    this.subject.next({ message, type });
    this.timer = setTimeout(() => {
      this.subject.next(null);
      this.timer = null;
    }, duration);
  }
}