import 'dart:io';

import 'package:path_provider/path_provider.dart';

class Message {
  final bool isUser; //标识信息是否来自用户还是AI
  final String text; //信息文本内容
  final DateTime timestamp; // 消息时间戳
  final bool isRecognizing; // 是否为语音识别中的临时消息
  final bool hasImage; // 是否包含图片
  final String? imagePath; // 图片路径
  final Map? meta; //卡片数据

  Message({
    // 构造函数
    required this.isUser,
    required this.text,
    DateTime? timestamp,
    this.isRecognizing = false,
    this.hasImage = false,
    this.imagePath,
    this.meta,
  }) : this.timestamp = timestamp ?? DateTime.now();

  // 从JSON构造函数
  factory Message.fromJson(Map<String, dynamic> json) {
    return Message(
      isUser: json['isUser'] as bool,
      text: json['text'] as String,
      timestamp: DateTime.parse(json['timestamp'] as String),
      isRecognizing: json['isRecognizing'] as bool? ?? false,
      hasImage: json['hasImage'] as bool? ?? false,
      imagePath: json['imagePath'] as String?,
      meta: json['meta'] as Map?,
    );
  }

  // 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'isUser': isUser,
      'text': text,
      'timestamp': timestamp.toIso8601String(),
      'isRecognizing': isRecognizing,
      'hasImage': hasImage,
      'imagePath': imagePath,
      'meta': meta,
    };
  }

  // 创建一个加载中的消息
  factory Message.loading() {
    return Message(
      isUser: false,
      text: '',
      timestamp: DateTime.now(),
      isRecognizing: true,
    );
  }

  // 复制并修改
  Message copyWith({
    bool? isUser,
    String? text,
    DateTime? timestamp,
    bool? isRecognizing,
    bool? hasImage,
    String? imagePath,
    Map? meta,
  }) {
    return Message(
      isUser: isUser ?? this.isUser,
      text: text ?? this.text,
      timestamp: timestamp ?? this.timestamp,
      isRecognizing: isRecognizing ?? this.isRecognizing,
      hasImage: hasImage ?? this.hasImage,
      imagePath: imagePath ?? this.imagePath,
      meta: meta ?? this.meta,
    );
  }
}