/**
 * Notification Center for React Native
 * Mimics the Swift NotificationCenter functionality
 */

export interface NotificationInfo {
  [key: string]: any;
}

export interface NotificationObserver {
  name: string;
  callback: (info: NotificationInfo) => void;
}

export class NotificationCenter {
  private static instance: NotificationCenter;
  private observers: Map<string, NotificationObserver[]> = new Map();

  public static getInstance(): NotificationCenter {
    if (!NotificationCenter.instance) {
      NotificationCenter.instance = new NotificationCenter();
    }
    return NotificationCenter.instance;
  }

  public addObserver(name: string, callback: (info: NotificationInfo) => void): void {
    if (!this.observers.has(name)) {
      this.observers.set(name, []);
    }
    this.observers.get(name)!.push({ name, callback });
  }

  public removeObserver(name: string, callback?: (info: NotificationInfo) => void): void {
    if (!this.observers.has(name)) return;
    
    if (callback) {
      const observers = this.observers.get(name)!;
      const index = observers.findIndex(obs => obs.callback === callback);
      if (index !== -1) {
        observers.splice(index, 1);
      }
    } else {
      this.observers.delete(name);
    }
  }

  public post(name: string, object: any = null, userInfo: NotificationInfo = {}): void {
    if (!this.observers.has(name)) return;
    
    const observers = this.observers.get(name)!;
    observers.forEach(observer => {
      try {
        observer.callback(userInfo);
      } catch (error) {
        console.error(`🎯 NotificationCenter: Error in observer for ${name}:`, error);
      }
    });
  }
}

// Notification names matching Swift version
export const NotificationNames = {
  toneListenSpectrumDidUpdate: 'toneListenSpectrumDidUpdate',
  toneListenFullSpectrumDidUpdate: 'toneListenFullSpectrumDidUpdate',
  toneListenAmplitudeDidUpdate: 'toneListenAmplitudeDidUpdate',
  toneListenFrequencyDidUpdate: 'toneListenFrequencyDidUpdate',
  toneListenSequenceDidUpdate: 'toneListenSequenceDidUpdate'
} as const;