import 'dart:async';
import 'package:common_utils/common_utils.dart';
import 'package:fleather/fleather.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:parchment/codecs.dart';

import '../../../../data/services/db/sqflite_api.dart';
import '../../../../data/services/network/api.dart';
import '../../controllers/meeting_details_controller.dart';
import '../../utils/meeting_ui_utils.dart';
import '../bottomSheet/ai_bottom_sheet.dart';
import '../bottomSheet/generate_bottom_sheet.dart';
class SummaryTab extends StatefulWidget {
  const SummaryTab({super.key});

  @override
  State<SummaryTab> createState() => _SummaryTabState();
}

class _SummaryTabState extends State<SummaryTab> {
  final _controller = Get.find<MeetingDetailsController>();

  late final Worker _personnelListener;
  late final Worker _summaryListener;

  /// 上一次装进编辑器的总结原文；服务端刷新回来的内容和它一样就不重建编辑器。
  String _lastLoadedSummary = '';

  final String _addressPrefix = '${'location'.tr}:'; // 对应中文：地点
  String _addressText = '';
  final String _personnelPrefix = '${'attendees'.tr}:'; // 对应中文：与会人员
  String _personnelText = '';
  final TextEditingController _addressController = TextEditingController();
  final TextEditingController _personnelController = TextEditingController();

  final FocusNode _focusNode = FocusNode();
  final GlobalKey<EditorState> _editorKey = GlobalKey();
  FleatherController? _fleatherController;

  bool _hasFocus = false;

  @override
  void initState() {
    super.initState();
    _initController();
    _addressController.addListener(_handleAddressChanged);
    _personnelController.addListener(_handlePersonnelChanged);
    _focusNode.addListener(() {
      setState(() {
        _hasFocus = _focusNode.hasFocus;
      });
    });
    _personnelListener =
        ever(_controller.personnelNumberModifications, (value) {
      _initController();
    });
    // 总结内容变了（服务端刷新 / 总结重跑 / 别的设备改过）就重装编辑器。
    // 原来只听与会人员那个信号，summaryNumberModifications 全项目只有思维导图在听，
    // 于是第一次进详情、服务端把总结拉回来之后，本页还是空的（2026-09-20 修）。
    // 用户正在编辑（_summaryDirty）时不动它，别把没保存的改动冲掉。
    _summaryListener = ever(_controller.summaryNumberModifications, (value) {
      if (_summaryDirty) return;
      if (_controller.meetingDetails.value.summary == _lastLoadedSummary) return;
      _initController();
    });
  }

  void _initController() {
    _addressController.text = _addressPrefix +
        (_controller.meetingDetails.value.address.isNotEmpty
            ? _controller.meetingDetails.value.address
            : '[${'inputLocation'.tr}]'); // 对应中文：输入地点
    _personnelController.text = _personnelPrefix +
        (_controller.meetingDetails.value.personnel.isNotEmpty
            ? _controller.meetingDetails.value.personnel
            : '[${'inputAttendees'.tr}]'); // 对应中文：输入与会人员
    _lastLoadedSummary = _controller.meetingDetails.value.summary;
    final markdown = const ParchmentMarkdownCodec()
        .decode(_controller.meetingDetails.value.summary);
    final fc = FleatherController(document: markdown);
    // 只有用户真的动过编辑器才允许回写。理由见 _saveSummary 的注释。
    _summaryDirty = false;
    _summaryChangeSub?.cancel();
    _summaryChangeSub = fc.document.changes.listen((_) => _summaryDirty = true);
    setState(() {
      _fleatherController = fc;
    });
  }

  /// 用户是否真的编辑过纪要正文。
  ///
  /// ⚠️ 不能只靠「编码结果和原文不一样」来判断：**空文档编码出来是 `"\n\n"`**，
  /// 与空字符串永远不相等，于是只要进过一次详情页、退出时就会把服务端的纪要
  /// 覆盖成 `"\n\n"`。2026-09-06 真机丢过一次总结就是这么来的：
  /// 客户端轮询死了没拿到总结 → 详情页里是空的 → 用户退出 → dispose 回写空值。
  bool _summaryDirty = false;
  StreamSubscription? _summaryChangeSub;

  void _handleAddressChanged() {
    String currentText = _addressController.text;
    TextSelection currentSelection = _addressController.selection;
    if (!currentText.startsWith(_addressPrefix)) {
      _addressController.value = TextEditingValue(
        text: _addressPrefix + _addressText,
        selection: TextSelection.collapsed(
          offset: _addressPrefix.length + _addressText.length,
        ),
      );
      return;
    } else {
      _addressText = currentText.substring(_addressPrefix.length);
    }

    if (currentSelection.start < _addressPrefix.length ||
        currentSelection.end < _addressPrefix.length) {
      int newStart = currentSelection.start < _addressPrefix.length
          ? _addressPrefix.length
          : currentSelection.start;
      int newEnd = currentSelection.end < _addressPrefix.length
          ? _addressPrefix.length
          : currentSelection.end;
      _addressController.selection = currentSelection.copyWith(
        baseOffset: newStart,
        extentOffset: newEnd,
      );
    }
  }

  void _handlePersonnelChanged() {
    String currentText = _personnelController.text;
    TextSelection currentSelection = _personnelController.selection;
    if (!currentText.startsWith(_personnelPrefix)) {
      _personnelController.value = TextEditingValue(
        text: _personnelPrefix + _personnelText,
        selection: TextSelection.collapsed(
          offset: _personnelPrefix.length + _personnelText.length,
        ),
      );
      return;
    } else {
      _personnelText = currentText.substring(_personnelPrefix.length);
    }

    if (currentSelection.start < _personnelPrefix.length ||
        currentSelection.end < _personnelPrefix.length) {
      int newStart = currentSelection.start < _personnelPrefix.length
          ? _personnelPrefix.length
          : currentSelection.start;
      int newEnd = currentSelection.end < _personnelPrefix.length
          ? _personnelPrefix.length
          : currentSelection.end;
      _personnelController.selection = currentSelection.copyWith(
        baseOffset: newStart,
        extentOffset: newEnd,
      );
    }
  }

  void _startEditSummary() {
    final fc = _fleatherController;
    if (fc == null) return;
    final end = fc.document.length - 1;
    fc.updateSelection(
      TextSelection.collapsed(offset: end < 0 ? 0 : end),
      source: ChangeSource.local,
    );
    _focusNode.requestFocus();
  }

  void _saveSummary() async {
    if (_fleatherController == null) return;
    final markdown =
        const ParchmentMarkdownCodec().encode(_fleatherController!.document);
    final current = _controller.meetingDetails.value.summary;
    // 三道闸，缺一不可：
    //  1. 用户没动过编辑器就绝不回写——dispose 是无条件调用的，页面只是被看了
    //     一眼也会走到这里；
    //  2. 两边都是空白（含只有换行）时视为没变化——空文档编码是 "\n\n"，
    //     直接和 "" 比永远不等；
    //  3. 比较前 trim，避免尾部空行造成的假变化。
    if (!_summaryDirty) return;
    if (markdown.trim().isEmpty && current.trim().isEmpty) return;
    if (markdown.trim() == current.trim()) return;

    // 先落本地再等服务端确认：详情页每次进都会用服务端整条覆盖本地，
    // 这里不 await 的话「改完立刻退出再进」会拿到旧值把刚改的冲掉。
    SqfliteApi.editMeeting(
      _controller.id,
      {'summary': markdown},
    );
    await Api.modifyRecordEchomeet({
      'id': _controller.id,
      'summary': markdown,
    });
    _controller.meetingDetails.value.summary = markdown;
    _controller.summaryNumberModifications.value++;
    _summaryDirty = false;
  }

  @override
  void dispose() {
    _personnelListener.dispose();
    _summaryListener.dispose();
    _saveSummary();
    _summaryChangeSub?.cancel();
    _fleatherController?.dispose();
    _focusNode.dispose();
    _addressController.dispose();
    _personnelController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    final TextStyle textStyle = TextStyle(
      color: isDarkMode ? Colors.grey[400] : Colors.grey[700],
      fontSize: 16.sp,
      letterSpacing: 0,
      height: 1.5,
    );

    return Stack(
      clipBehavior: Clip.none,
      children: [
        SingleChildScrollView(
          padding: EdgeInsets.only(bottom: 80.w),
          child: Obx(
            () => Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Padding(
                  padding: EdgeInsets.symmetric(vertical: 10.w),
                  child: Text(
                    _controller.meetingData.value.title,
                    style: TextStyle(
                      fontSize: 20.sp,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                Row(
                  children: [
                    Container(
                      padding:
                          EdgeInsets.symmetric(horizontal: 5.w, vertical: 2.w),
                      margin: EdgeInsets.only(right: 10.w),
                      decoration: BoxDecoration(
                        color: isDarkMode ? Colors.grey[900] : Colors.grey[200],
                        borderRadius: BorderRadius.circular(4.w),
                      ),
                      child: Text(
                        _controller.meetingData.value.type,
                        style: TextStyle(
                          color:
                              isDarkMode ? Colors.grey[400] : Colors.grey[500],
                          fontSize: 10.sp,
                        ),
                      ),
                    ),
                    Icon(
                      Icons.calendar_month,
                      size: 14.w,
                      color: isDarkMode ? Colors.grey[400] : Colors.grey[500],
                    ),
                    2.horizontalSpace,
                    Text(
                      DateUtil.formatDateMs(
                        _controller.meetingData.value.creationtime,
                        format: DateFormats.y_mo_d_h_m,
                      ),
                      style: TextStyle(
                        color: isDarkMode ? Colors.grey[400] : Colors.grey[500],
                        fontSize: 12.sp,
                      ),
                    ),
                    10.horizontalSpace,
                    Icon(
                      Icons.access_time,
                      size: 14.w,
                      color: isDarkMode ? Colors.grey[400] : Colors.grey[500],
                    ),
                    2.horizontalSpace,
                    Text(
                      _formatDateSeconds(_controller.meetingData.value.seconds),
                      style: TextStyle(
                        color: isDarkMode ? Colors.grey[400] : Colors.grey[500],
                        fontSize: 12.sp,
                      ),
                    ),
                  ],
                ),
                Padding(
                  padding: EdgeInsets.symmetric(vertical: 10.w),
                  child: Divider(
                    height: 1,
                    color: isDarkMode ? Colors.grey[900] : Colors.grey[300],
                  ),
                ),
                Container(
                  padding: EdgeInsets.only(left: 20.w),
                  margin: EdgeInsets.symmetric(vertical: 10.w),
                  decoration: BoxDecoration(
                    border: Border(
                      left: BorderSide(
                        width: 2,
                        color: isDarkMode
                            ? Colors.white.withValues(alpha: 0.1)
                            : Colors.grey[300]!,
                      ),
                    ),
                  ),
                  child: Focus(
                    onFocusChange: (bool hasFocus) {
                      if (!hasFocus) {
                        bool isEdit = false;
                        if (_addressText.isNotEmpty &&
                            _addressText !=
                                _controller.meetingDetails.value.address) {
                          _controller.meetingDetails.value.address =
                              _addressText;
                          isEdit = true;
                        }
                        if (_personnelText.isNotEmpty &&
                            _personnelText !=
                                _controller.meetingDetails.value.personnel) {
                          _controller.meetingDetails.value.personnel =
                              _personnelText;
                          isEdit = true;
                        }
                        if (isEdit) {
                          Api.modifyRecordEchomeet({
                            'id': _controller.id,
                            'address': _controller.meetingDetails.value.address,
                            'personnel':
                                _controller.meetingDetails.value.personnel,
                          });
                          SqfliteApi.editMeeting(
                            _controller.id,
                            {
                              'address':
                                  _controller.meetingDetails.value.address,
                              'personnel':
                                  _controller.meetingDetails.value.personnel,
                            },
                          );
                        }
                      }
                    },
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          '${'dateAndTime'.tr}:${DateUtil.formatDateMs(
                            _controller.meetingData.value.creationtime,
                            format: DateFormats.y_mo_d_h_m,
                          )}',
                          style: textStyle,
                        ),
                        TextField(
                          controller: _addressController,
                          style: textStyle,
                          minLines: 1,
                          maxLines: 100,
                          decoration: const InputDecoration(
                            isDense: true,
                            fillColor: Colors.transparent,
                            border: InputBorder.none,
                            contentPadding: EdgeInsets.zero,
                          ),
                        ),
                        TextField(
                          controller: _personnelController,
                          style: textStyle,
                          minLines: 1,
                          maxLines: 100,
                          decoration: const InputDecoration(
                            isDense: true,
                            fillColor: Colors.transparent,
                            border: InputBorder.none,
                            contentPadding: EdgeInsets.zero,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
                Padding(
                  padding: EdgeInsets.only(top: 10.w),
                  child: _controller.meetingDetails.value.tasktype < 10000
                      ? FleatherEditor(
                          controller: _fleatherController!,
                          focusNode: _focusNode,
                          editorKey: _editorKey,
                        )
                      : Center(
                          child: Text(
                            'summaryFailed'.tr, // 总结失败，请稍后重试
                            style: TextStyle(
                              color: MeetingUIUtils.getSecondaryTextColor(
                                  isDarkMode),
                              fontSize: 14.sp,
                            ),
                          ),
                        ),
                ),
              ],
            ),
          ),
        ),
        if (!_hasFocus)
          Obx(
            () => Positioned(
              bottom: MediaQuery.of(context).padding.bottom + 20.w,
              left: 0,
              right: 0,
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  if (_controller.meetingDetails.value.tasktype >= 3 &&
                      _controller.meetingDetails.value.tasktype < 10000)
                    _button(
                      Icons.edit,
                      'editSpeaker'.tr, // 对应中文：编辑
                      _startEditSummary,
                    ),
                  if (_controller.meetingDetails.value.tasktype >= 3 &&
                      _controller.meetingDetails.value.tasktype < 10000)
                    _button(
                      Icons.auto_awesome,
                      'Ask AI',
                      () {
                        Get.bottomSheet(
                          const AIBottomSheet(),
                          isScrollControlled: true,
                          backgroundColor:
                              isDarkMode ? Colors.grey[800] : Colors.white,
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.vertical(
                              top: Radius.circular(12.r),
                            ),
                          ),
                        );
                      },
                    ),
                  if (_controller.meetingDetails.value.tasktype == 0)
                    SizedBox(
                      width: 150.w,
                      child: _button(
                        Icons.auto_awesome,
                        'generate'.tr, // 对应中文：生成
                        () {
                          Get.bottomSheet(
                            const GenerateBottomSheet(),
                            isScrollControlled: true,
                            backgroundColor: isDarkMode
                                ? Colors.grey[800]
                                : Colors.grey[100],
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.vertical(
                                top: Radius.circular(12.r),
                              ),
                            ),
                          );
                        },
                      ),
                    ),
                  if (_controller.meetingDetails.value.tasktype == 10002)
                    SizedBox(
                      width: 150.w,
                      child: _button(
                        Icons.auto_awesome,
                        'regenerate'.tr, // 重新生成
                        () {
                          Get.bottomSheet(
                            const GenerateBottomSheet(),
                            isScrollControlled: true,
                            backgroundColor: isDarkMode
                                ? Colors.grey[800]
                                : Colors.grey[100],
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.vertical(
                                top: Radius.circular(12.r),
                              ),
                            ),
                          );
                        },
                      ),
                    ),
                  if (_controller.meetingDetails.value.tasktype == 10001)
                    SizedBox(
                      width: 150.w,
                      child: _button(
                        Icons.auto_awesome,
                        'reSummarize'.tr, // 重新总结
                        () {
                          Get.bottomSheet(
                            const GenerateBottomSheet(
                              isSummarizeAgain: true,
                            ),
                            isScrollControlled: true,
                            backgroundColor: isDarkMode
                                ? Colors.grey[800]
                                : Colors.grey[100],
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.vertical(
                                top: Radius.circular(12.r),
                              ),
                            ),
                          );
                        },
                      ),
                    ),
                ],
              ),
            ),
          ),
        if (_hasFocus)
          Positioned(
            bottom: 0,
            left: -12.w,
            right: -12.w,
            child: SafeArea(
              top: false,
              child: Container(
                height: 40,
                color: isDarkMode ? Colors.grey[800] : Colors.white,
                alignment: Alignment.center,
                child: FleatherToolbar.basic(
                  controller: _fleatherController!,
                  editorKey: _editorKey,
                ),
              ),
            ),
          ),
      ],
    );
  }

  Widget _button(IconData icon, String title, Function() onTap) {
    return Builder(
      builder: (context) {
        final isDarkMode = Theme.of(context).brightness == Brightness.dark;
        return GestureDetector(
          onTap: onTap,
          child: Container(
            height: 42.w,
            padding: EdgeInsets.symmetric(horizontal: 15.w),
            margin: EdgeInsets.symmetric(horizontal: 4.w),
            decoration: BoxDecoration(
              color: isDarkMode ? Colors.white : Colors.black,
              borderRadius: BorderRadius.circular(42.w),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  icon,
                  color: isDarkMode ? Colors.black : Colors.white,
                  size: 20.sp,
                ),
                5.horizontalSpace,
                Text(
                  title,
                  style: TextStyle(
                    color: isDarkMode ? Colors.black : Colors.white,
                    fontSize: 14.sp,
                  ),
                ),
              ],
            ),
          ),
        );
      },
    );
  }

  String _formatDateSeconds(int seconds) {
    if (seconds < 60) {
      return '${seconds}s';
    } else if (seconds < 3600) {
      int minutes = seconds ~/ 60;
      int remainingSeconds = seconds % 60;
      return '${minutes}m ${remainingSeconds}s';
    } else {
      int hours = seconds ~/ 3600;
      int remainingMinutes = (seconds % 3600) ~/ 60;
      int remainingSeconds = seconds % 60;
      return '${hours}h ${remainingMinutes}m ${remainingSeconds}s';
    }
  }
}