// 通知类型
export type NotificationType = "success" | "error" | "warning" | "info";

export interface AppNotification {
  id: string;
  type: NotificationType;
  title: string;
  message: string;
  duration?: number;
  timestamp: Date;
}

// 通知管理器
class NotificationManager {
  private notifications: AppNotification[] = [];
  private listeners: ((notifications: AppNotification[]) => void)[] = [];

  // 添加通知
  addNotification(
    type: NotificationType,
    title: string,
    message: string,
    duration: number = 5000
  ): string {
    const id = `notification-${Date.now()}-${Math.random()}`;
    const notification: AppNotification = {
      id,
      type,
      title,
      message,
      duration,
      timestamp: new Date(),
    };

    this.notifications.push(notification);
    this.notifyListeners();

    // 自动移除通知
    if (duration > 0) {
      setTimeout(() => {
        this.removeNotification(id);
      }, duration);
    }

    return id;
  }

  // 移除通知
  removeNotification(id: string): void {
    this.notifications = this.notifications.filter((n) => n.id !== id);
    this.notifyListeners();
  }

  // 清空所有通知
  clearAll(): void {
    this.notifications = [];
    this.notifyListeners();
  }

  // 获取所有通知
  getNotifications(): AppNotification[] {
    return [...this.notifications];
  }

  // 添加监听器
  addListener(listener: (notifications: AppNotification[]) => void): void {
    this.listeners.push(listener);
  }

  // 移除监听器
  removeListener(listener: (notifications: AppNotification[]) => void): void {
    this.listeners = this.listeners.filter((l) => l !== listener);
  }

  // 通知所有监听器
  private notifyListeners(): void {
    this.listeners.forEach((listener) => listener(this.notifications));
  }

  // 便捷方法
  success(title: string, message: string, duration?: number): string {
    return this.addNotification("success", title, message, duration);
  }

  error(title: string, message: string, duration?: number): string {
    return this.addNotification("error", title, message, duration);
  }

  warning(title: string, message: string, duration?: number): string {
    return this.addNotification("warning", title, message, duration);
  }

  info(title: string, message: string, duration?: number): string {
    return this.addNotification("info", title, message, duration);
  }
}

// 创建全局通知管理器实例
export const notificationManager = new NotificationManager();

// 浏览器通知 API
export class BrowserNotifications {
  static async requestPermission(): Promise<boolean> {
    if (!("Notification" in window)) {
      console.warn("此浏览器不支持通知");
      return false;
    }

    if (Notification.permission === "granted") {
      return true;
    }

    if (Notification.permission === "denied") {
      return false;
    }

    const permission = await Notification.requestPermission();
    return permission === "granted";
  }

  static async showNotification(
    title: string,
    options?: NotificationOptions
  ): Promise<globalThis.Notification | null> {
    if (!("Notification" in window)) {
      return null;
    }

    if (Notification.permission !== "granted") {
      const granted = await this.requestPermission();
      if (!granted) {
        return null;
      }
    }

    return new globalThis.Notification(title, {
      icon: "/favicon.ico",
      badge: "/favicon.ico",
      ...options,
    });
  }

  static async showRecordingComplete(): Promise<void> {
    await this.showNotification("录音完成", {
      body: "您的录音已成功保存",
      tag: "recording-complete",
    });
  }

  static async showUploadComplete(): Promise<void> {
    await this.showNotification("上传完成", {
      body: "录音文件已成功上传到服务器",
      tag: "upload-complete",
    });
  }

  static async showUploadError(): Promise<void> {
    await this.showNotification("上传失败", {
      body: "录音文件上传失败，请重试",
      tag: "upload-error",
    });
  }
}