export type AttachmentType = 'image' | 'video' | 'audio' | 'document' | 'other';

export interface Attachment {
  id: string;
  file: File;
  type: AttachmentType;
  url: string; // Object URL for preview
}

export interface AudioRecording {
  blob: Blob;
  url: string;
  duration: number; // in seconds
}

export interface Message {
  id: string;
  sender: 'user' | 'system';
  text: string;
  attachments?: Attachment[];
  audio?: AudioRecording;
  timestamp: Date;
  status: 'sending' | 'sent' | 'error';
}