import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_markdown/flutter_markdown.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';

import '../../../data/services/deapsound_ai_service.dart';
import '../controllers/meeting_details_controller.dart';

class AIBottomSheet extends StatefulWidget {
  const AIBottomSheet({super.key});

  @override
  State<AIBottomSheet> createState() => _AIBottomSheetState();
}

class _AIBottomSheetState extends State<AIBottomSheet> {
  final _controller = Get.find<MeetingDetailsController>();
  final ScrollController _scrollController = ScrollController();

  final _deapsoundAI = DeapsoundAIService();
  StreamSubscription? _aiResponseSubscription;

  final TextEditingController _texController = TextEditingController();

  String _allText = '';

  List _dataList = [];

  final List _cruxList = [
    '添加代办事项',
    '提取结论',
    '生成关键指标',
  ];

  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    _getAllText();
  }

  void _getAllText() {
    for (var element in _controller.textList) {
      if (element['speaker'].isNotEmpty) {
        _allText += '${element['speaker']}:';
      }
      _allText += '${element['content']}\n';
    }
  }

  @override
  void dispose() {
    _texController.dispose();
    _scrollController.dispose();
    _aiResponseSubscription?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.symmetric(horizontal: 12.w),
      constraints: BoxConstraints(
        maxHeight: 1.sh - 50.h - MediaQuery.of(context).viewInsets.bottom,
      ),
      child: Column(
        children: [
          Container(
            padding: EdgeInsets.symmetric(vertical: 10.w),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                26.horizontalSpace,
                Text(
                  'Ask AI',
                  style: TextStyle(
                    fontSize: 16.sp,
                    color: Colors.black87,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                GestureDetector(
                  onTap: () => Get.back(),
                  child: Container(
                    width: 26.w,
                    height: 26.w,
                    decoration: BoxDecoration(
                      color: Colors.grey[100],
                      borderRadius: BorderRadius.circular(26.r),
                    ),
                    child: Icon(
                      Icons.close,
                      size: 18.w,
                      color: Colors.grey[400],
                    ),
                  ),
                ),
              ],
            ),
          ),
          Expanded(
            child: _dataList.isNotEmpty
                ? Align(
                    alignment: Alignment.topCenter,
                    child: ListView.builder(
                      controller: _scrollController,
                      itemCount: _dataList.length,
                      shrinkWrap: true,
                      reverse: true,
                      itemBuilder: (BuildContext context, int index) {
                        Map data = _dataList[index];
                        return _item(data);
                      },
                    ),
                  )
                : _empty(),
          ),
          _inputBox(),
        ],
      ),
    );
  }

  Widget _item(Map data) {
    return Column(
      children: [
        Container(
          padding: EdgeInsets.symmetric(vertical: 10.w),
          alignment: Alignment.centerRight,
          child: Container(
            padding: EdgeInsets.all(10.w),
            decoration: BoxDecoration(
              color: Colors.grey[200],
              borderRadius: BorderRadius.circular(12.r),
            ),
            child: Text(
              data['user'],
              style: TextStyle(
                fontSize: 14.sp,
              ),
            ),
          ),
        ),
        if (data['assistant'].isNotEmpty)
          Container(
            padding: EdgeInsets.symmetric(vertical: 10.w),
            alignment: Alignment.centerLeft,
            child: MarkdownBody(
              data: data['assistant'],
            ),
          ),
      ],
    );
  }

  Widget _empty() {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 10.w),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '今天我能帮您做点什么呢？',
            style: TextStyle(
              fontSize: 18.sp,
              fontWeight: FontWeight.bold,
            ),
          ),
          Padding(
            padding: EdgeInsets.only(top: 10.w, bottom: 30.w),
            child: Row(
              children: [
                Icon(
                  Icons.audio_file_outlined,
                  size: 14.w,
                  color: Colors.grey[500],
                ),
                2.horizontalSpace,
                Text(
                  _controller.meetingData.value.title,
                  style: TextStyle(
                    color: Colors.grey[500],
                    fontSize: 12.sp,
                  ),
                ),
              ],
            ),
          ),
          ...List.generate(
            _cruxList.length,
            (int index) => GestureDetector(
              onTap: () {
                _sendMessage(_cruxList[index]);
              },
              child: Container(
                width: double.infinity,
                padding: EdgeInsets.symmetric(horizontal: 15.w, vertical: 8.w),
                margin: EdgeInsets.symmetric(vertical: 5.w),
                decoration: BoxDecoration(
                  color: Colors.grey[100],
                  borderRadius: BorderRadius.circular(20.r),
                  border: Border.all(
                    color: Colors.grey[300]!,
                  ),
                ),
                child: Text(
                  _cruxList[index],
                  style: TextStyle(fontSize: 12.sp),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _inputBox() {
    return Container(
      height: 42.w,
      padding: EdgeInsets.symmetric(horizontal: 10.w),
      margin: EdgeInsets.only(bottom: 10.w),
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(42.r),
        gradient: LinearGradient(
          begin: Alignment.centerLeft,
          end: Alignment.centerRight,
          colors: [
            const Color(0xFFab47bc).withOpacity(0.1), // 薰衣草紫
            const Color(0xFFec407a).withOpacity(0.2), // 品红
          ],
        ),
      ),
      child: Row(
        children: [
          5.horizontalSpace,
          Expanded(
            child: TextField(
              controller: _texController,
              style: TextStyle(
                fontSize: 16.sp,
                color: Colors.black87,
                letterSpacing: 0,
                height: 1.4,
              ),
              decoration: InputDecoration(
                hintText: '问 AI ...',
                hintStyle: TextStyle(
                  fontSize: 16.sp,
                  color: Colors.grey[400],
                  letterSpacing: 0,
                  height: 1.4,
                ),
                isDense: true,
                fillColor: Colors.transparent,
                border: InputBorder.none,
                contentPadding: EdgeInsets.zero,
              ),
              onSubmitted: _sendMessage,
            ),
          ),
          10.horizontalSpace,
          GestureDetector(
            onTap: () {
              _sendMessage(_texController.text);
            },
            child: Container(
              width: 26.w,
              height: 26.w,
              decoration: BoxDecoration(
                color: _isLoading ? Colors.black87 : Colors.grey,
                borderRadius: BorderRadius.circular(26.r),
              ),
              child: Icon(
                _isLoading ? Icons.pause : Icons.arrow_upward,
                size: 18.w,
                color: Colors.white,
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _sendMessage(String value) {
    if (_isLoading || value.isEmpty) return;
    _texController.clear();
    setState(() {
      _isLoading = true;
      _dataList.insert(0, {
        'user': value,
        'assistant': '',
      });
    });
    if (_dataList.length > 1) {
      _scrollController.jumpTo(0);
    }
    final responseStream = _deapsoundAI.sendMessageStream(
      messages: [
        ..._getUserMessage(),
        {'role': 'user', 'content': value},
      ],
    );
    _aiResponseSubscription = responseStream.listen(
      (chunk) {
        setState(() {
          _dataList.first['assistant'] += chunk;
        });
      },
      onDone: () {
        setState(() {
          _isLoading = false;
        });
      },
    );
  }

  List _getUserMessage() {
    List<Map<String, String>> messages = [
      {
        'role': 'system',
        'content': '你只能根据这段对话记录回答问题，禁止引入外部知识。对话内容：$_allText',
      },
    ];
    for (int i = _dataList.length - 1; i >= 0; i--) {
      messages.add({'role': 'user', 'content': _dataList[i]['user']});
    }
    return messages;
  }
}