import 'package:elysia/bean/Mappable.dart';
import 'package:intl/intl.dart';

import 'package:intl/intl.dart';

import '../plugin/StringTool.dart';

class ChatCacheItem extends Mappable {
  final String roomId;
  final String roomName;
  final String roomImage;
  String lastChatMessage;
  String lastChatTime;
  final String engine;

  ChatCacheItem({
    required this.roomId,
    required this.roomName,
    required this.roomImage,
    required String lastChatMessage,
    required this.lastChatTime,
    required this.engine,
  }) : lastChatMessage = _formatMessage(lastChatMessage);

  /// 格式化消息（去掉 Markdown + 限制长度）
  static String _formatMessage(String message) {
    String text = StringTool.stripMarkdown(message);
    if (text.length > 51) {
      text = text.substring(0, 50) + "...";
    }
    return text;
  }

  void updateTime(DateTime date) {
    lastChatTime = DateFormat('HH:mm').format(date);
  }

  /// copy 方法也会自动格式化 lastChatMessage
  ChatCacheItem copy({
    String? roomId,
    String? roomName,
    String? roomImage,
    String? lastChatMessage,
    String? lastChatTime,
    String? engine,
  }) {
    return ChatCacheItem(
      roomId: roomId ?? this.roomId,
      roomName: roomName ?? this.roomName,
      roomImage: roomImage ?? this.roomImage,
      lastChatMessage: lastChatMessage ?? this.lastChatMessage,
      lastChatTime: lastChatTime ?? this.lastChatTime,
      engine: engine ?? this.engine,
    );
  }

  factory ChatCacheItem.fromJson(Map<String, dynamic> json) {
    String formatted;
    try {
      if (json['lastChatTime'] == null) {
        formatted = "";
      } else {
        DateTime dateTime;
        if (json['lastChatTime'] is int) {
          dateTime = DateTime.fromMillisecondsSinceEpoch(json['lastChatTime']);
        } else {
          dateTime = DateTime.parse(json['lastChatTime']);
        }
        formatted = DateFormat('HH:mm').format(dateTime);
      }
    } catch (e) {
      formatted = "";
    }

    return ChatCacheItem(
      roomId: json['roomId'] ?? '',
      roomName: json['roomName'] ?? '',
      roomImage: json['roomImage'] ?? '',
      lastChatMessage: json['lastChatMessage'] ?? '',
      lastChatTime: formatted,
      engine: json['engine'] ?? '',
    );
  }

  @override
  Map<String, dynamic> toMap() {
    return {
      'roomId': roomId,
      'roomName': roomName,
      'roomImage': roomImage,
      'lastChatMessage': lastChatMessage,
      'lastChatTime': lastChatTime,
      'engine': engine,
    };
  }
}