/**
 * @copyright 2026 NHCarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

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

export interface Toast {
  id: number;
  message: string;
  type: 'error' | 'success' | 'info' | 'warning';
  duration: number;
}

@Injectable({
  providedIn: 'root'
})
export class ToastService {
  private toasts = signal<Toast[]>([]);
  public readonly toastList = this.toasts.asReadonly();
  private nextId = 0;

  /**
   * Show an error toast notification.
   */
  error(message: string, duration = 5000): void {
    this.addToast(message, 'error', duration);
  }

  /**
   * Show a success toast notification.
   */
  success(message: string, duration = 3000): void {
    this.addToast(message, 'success', duration);
  }

  /**
   * Show an info toast notification.
   */
  info(message: string, duration = 3000): void {
    this.addToast(message, 'info', duration);
  }

  /**
   * Show a warning toast notification.
   */
  warning(message: string, duration = 4000): void {
    this.addToast(message, 'warning', duration);
  }

  /**
   * Remove a toast by ID.
   */
  remove(id: number): void {
    this.toasts.update(toasts => toasts.filter(t => t.id !== id));
  }

  private addToast(message: string, type: Toast['type'], duration: number): void {
    const id = this.nextId++;
    const toast: Toast = { id, message, type, duration };

    this.toasts.update(toasts => [...toasts, toast]);

    // Auto-remove after duration
    setTimeout(() => {
      this.remove(id);
    }, duration);
  }
}