dating_touchme_app/lib/widget/message/message_item.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';

import 'text_item.dart';
import 'image_item.dart';

class MessageItem extends StatelessWidget {
  final EMMessage message;
  final bool isSentByMe;
  final EMMessage? previousMessage;

  const MessageItem({
    required this.message,
    required this.isSentByMe,
    this.previousMessage,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    // 处理文本消息
    if (message.body.type == MessageType.TXT) {
      final textBody = message.body as EMTextMessageBody;
      return TextItem(
        textBody: textBody,
        isSentByMe: isSentByMe,
        showTime: shouldShowTime(),
        formattedTime: formatMessageTime(message.serverTime),
      );
    }
    // 处理图片消息
    else if (message.body.type == MessageType.IMAGE) {
      final imageBody = message.body as EMImageMessageBody;
      return ImageItem(
        imageBody: imageBody,
        isSentByMe: isSentByMe,
        showTime: shouldShowTime(),
        formattedTime: formatMessageTime(message.serverTime),
      );
    }
    
    // 非文本消息显示占位符
    return Column(
      children: [
        if (shouldShowTime()) _buildTimeLabel(),
        Container(
          padding: EdgeInsets.symmetric(
            horizontal: 16.w,
            vertical: 8.h,
          ),
          child: Text('不支持的消息类型'),
        ),
      ],
    );
  }

  // 判断是否需要显示时间
  bool shouldShowTime() {
    if (previousMessage == null) {
      return true; // 第一条消息显示时间
    }
    
    // 判断距离上一条消息是否超过20分钟（1200000毫秒）
    return (message.serverTime - previousMessage!.serverTime) > 1200000;
  }

  // 构建时间标签
  Widget _buildTimeLabel() {
    final formattedTime = formatMessageTime(message.serverTime);
    
    return Container(
      alignment: Alignment.center,
      padding: EdgeInsets.symmetric(
        horizontal: 16.w,
      ),
      child: Container(
        padding: EdgeInsets.symmetric(
          horizontal: 12.w,
        ),
        child: Text(
          formattedTime,
          style: TextStyle(
            fontSize: 12.sp,
            color: Colors.grey,
          ),
        ),
      ),
    );
  }

  // 格式化消息时间
  String formatMessageTime(int timestamp) {
    final date = DateTime.fromMillisecondsSinceEpoch(timestamp);
    final now = DateTime.now();
    final today = DateTime(now.year, now.month, now.day);
    final yesterday = DateTime(now.year, now.month, now.day - 1);
    final messageDate = DateTime(date.year, date.month, date.day);
    
    if (messageDate.isAtSameMomentAs(today)) {
      // 今天的消息显示时间
      return '今天 ${date.hour.toString().padLeft(2, '0')}:${date.minute.toString().padLeft(2, '0')}';
    } else if (messageDate.isAtSameMomentAs(yesterday)) {
      // 昨天的消息
      return '昨天 ${date.hour.toString().padLeft(2, '0')}:${date.minute.toString().padLeft(2, '0')}';
    } else {
      // 其他日期显示完整日期和时间
      return '${date.month}月${date.day}日 ${date.hour.toString().padLeft(2, '0')}:${date.minute.toString().padLeft(2, '0')}';
    }
  }


}