import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'youtube_player_page.dart'; // YoutubePlayerPage import
import 'common/widgets/custom_bottom_nav_bar.dart';

// PlanDetailItem 클래스 (이전과 동일)
class PlanDetailItem {
  final String lessonId;
  final String lessonTag;
  final String lessonUrl;
  final String thumbnail;

  PlanDetailItem({
    required this.lessonId,
    required this.lessonTag,
    required this.lessonUrl,
    required this.thumbnail,
  });

  factory PlanDetailItem.fromJson(Map<String, dynamic> json) {
    return PlanDetailItem(
      lessonId: json['casestudy lesson id'] ?? 'ID 없음',
      lessonTag: json['lesson tag'] ?? '태그 없음',
      lessonUrl: json['lesson url'] ?? 'URL 없음',
      thumbnail: json['thumbnail'] ?? '',
    );
  }
}

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

  @override
  State<PlanPageDetail> createState() => _PlanPageDetailState();
}

class _PlanPageDetailState extends State<PlanPageDetail> {
  String? _planId;
  String? _planTitle; // <<< planTitle을 저장할 상태 변수 추가 >>>
  Future<List<PlanDetailItem>>? _planDetails;
  late int _currentBottomNavIndex;
  String? _selectedYoutubeUrl;

  @override
  void initState() {
    super.initState();
    _currentBottomNavIndex = 0;
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    // 인자를 한 번만 처리하도록 조건 추가
    if (_planId == null && _planTitle == null) {
      final Object? arguments = ModalRoute.of(context)?.settings.arguments;
      if (arguments is Map<String, String>) { // <<< 전달받은 인자가 Map인지 확인 >>>
        setState(() { // <<< setState로 상태 변수 업데이트 >>>
          _planId = arguments['planId'];
          _planTitle = arguments['planTitle'];
        });

        if (_planId != null) {
          _planDetails = _fetchPlanDetails(_planId!);
        } else {
          // Map에는 있지만 planId 키가 없는 경우 (이론상 발생하기 어려움)
          setState(() {
            _planTitle = arguments['planTitle'] ?? 'Error'; // planTitle은 있을 수 있음
          });
          _planDetails =
              Future.error(Exception("Plan ID가 Map에 포함되지 않았습니다."));

        }
      } else {
        // 인자가 Map이 아니거나 null인 경우
        setState(() {
          _planTitle = 'Error'; // AppBar에 오류 표시
        });
        _planDetails =
            Future.error(Exception("전달된 인자가 올바르지 않습니다. (Map<String, String> 형태여야 함)"));

      }
    }
  }

  Future<List<PlanDetailItem>> _fetchPlanDetails(String planId) async {
    final response = await http.get(
        Uri.parse('https://helloworld1-ad2uqhckxq-uc.a.run.app/?id=$planId'));

    if (response.statusCode == 200) {
      final Map<String, dynamic> decodedJson = json.decode(response.body);
      if (decodedJson.containsKey('data') && decodedJson['data'] is List) {
        final List<dynamic> detailsJson = decodedJson['data'];
        return detailsJson
            .map((jsonItem) =>
            PlanDetailItem.fromJson(jsonItem as Map<String, dynamic>))
            .toList();
      } else {
        throw Exception(
            'Invalid API response format: "data" field is missing or not a list.');
      }
    } else {
      throw Exception(
          'Failed to load plan details. Status code: ${response.statusCode}');
    }
  }

  void _onBottomNavItemTapped(int index) {
    setState(() {
      _currentBottomNavIndex = index;
    });
    if (index == 0) {
      Navigator.of(context).popUntil((route) => route.isFirst);
    } else {
      String tabName = '';
      switch (index) {
        case 1:
          tabName = 'Plan';
          break;
        case 2:
          tabName = 'Statistics';
          break;
        case 3:
          tabName = 'Jobs'; // New case for Jobs
          break;
        case 4:
          tabName = 'More'; // Updated case for More
          break;
      }
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('$tabName 탭으로 이동 (구현 필요)')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        toolbarHeight: 40,
        title: Text(_planTitle.toString()),
      ),
      body: _planId == null && _planTitle == null && _planDetails == null
          ? Center( // 초기 로딩 상태 또는 인자 오류
        child: _planTitle == 'Error'
            ? const Text(
          '플랜 정보를 불러올 수 없습니다.',
          style: TextStyle(fontSize: 18, color: Colors.red),
          textAlign: TextAlign.center,
          maxLines: 3,
          overflow: TextOverflow.ellipsis,
        )
            : const CircularProgressIndicator(),
      )
          : FutureBuilder<List<PlanDetailItem>>(
        future: _planDetails,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          } else if (snapshot.hasError) {
            return Center(
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Text('Error loading details: ${snapshot.error}', textAlign: TextAlign.center,
                  maxLines: 3,
                  overflow: TextOverflow.ellipsis,
              )));
          } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
            return const Center(child: Text('세부 계획 데이터가 없습니다.'));
          } else {
            final details = snapshot.data!;

            // 첫 번째 비디오의 URL을 가져와 _selectedYoutubeUrl을 초기화합니다.
            if (_selectedYoutubeUrl == null && details.isNotEmpty) {
              _selectedYoutubeUrl = details.firstWhere(
                (item) => item.lessonUrl.isNotEmpty &&
                          (item.lessonUrl.contains('youtube.com') ||
                           item.lessonUrl.contains('youtu.be')),
                orElse: () => PlanDetailItem(lessonId: '', lessonTag: '', lessonUrl: '', thumbnail: ''),
              ).lessonUrl.isNotEmpty ? details.firstWhere(
                (item) => item.lessonUrl.isNotEmpty &&
                          (item.lessonUrl.contains('youtube.com') ||
                           item.lessonUrl.contains('youtu.be')),
                orElse: () => PlanDetailItem(lessonId: '', lessonTag: '', lessonUrl: '', thumbnail: ''),
              ).lessonUrl : null;
            }

            return Column( // ListView와 YoutubePlayerPage를 세로로 배치하기 위해 Column 사용
              children: [
                SizedBox(
                  height: 150, // 가로 스크롤 리스트의 높이
                  child: ListView.builder(
                    scrollDirection: Axis.horizontal,
                    padding: const EdgeInsets.symmetric(horizontal: 8.0),
                    itemCount: details.length,
                    itemBuilder: (context, index) {
                      final item = details[index];
                      return GestureDetector(
                        onTap: () {
                          if (item.lessonUrl.isNotEmpty &&
                              (item.lessonUrl.contains('youtube.com') ||
                                  item.lessonUrl.contains('youtu.be'))) {
                            setState(() {
                              _selectedYoutubeUrl = item.lessonUrl;
                            });
                          } else {
                            ScaffoldMessenger.of(context).showSnackBar(
                              SnackBar(
                                  content: Text(
                                      '유효한 YouTube URL이 아닙니다: ${item.lessonUrl}')),
                            );
                          }
                        },
                        child: Container(
                          width: 110,
                          margin: const EdgeInsets.symmetric(
                              horizontal: 8.0, vertical: 8.0),
                          child: Column(
                            mainAxisSize: MainAxisSize.min,
                            crossAxisAlignment: CrossAxisAlignment.center,
                            children: <Widget>[
                              SizedBox(
                                width: 100,
                                height: 100,
                                child: ClipRRect(
                                  borderRadius:
                                      BorderRadius.circular(8.0),
                                  child: item.thumbnail.isNotEmpty
                                      ? Image.network(
                                          item.thumbnail,
                                          fit: BoxFit.cover,
                                          errorBuilder: (context, error,
                                              stackTrace) {
                                            return Container(
                                              color: Colors.grey[200],
                                              child: const Icon(
                                                  Icons.broken_image,
                                                  size: 40,
                                                  color: Colors.grey),
                                            );
                                          },
                                          loadingBuilder: (BuildContext
                                                  context,
                                              Widget child,
                                              ImageChunkEvent?
                                                  loadingProgress) {
                                            if (loadingProgress == null)
                                              return child;
                                            return Center(
                                              child:
                                                  CircularProgressIndicator(
                                                value: loadingProgress
                                                            .expectedTotalBytes !=
                                                        null
                                                    ? loadingProgress
                                                            .cumulativeBytesLoaded /
                                                        loadingProgress
                                                            .expectedTotalBytes!
                                                    : null,
                                                strokeWidth: 2.0,
                                              ),
                                            );
                                          },
                                        )
                                      : Container(
                                          color: Colors.grey[200],
                                          child: const Icon(
                                              Icons.image_not_supported,
                                              size: 40,
                                              color: Colors.grey),
                                        ),
                                ),
                              ),
                              const SizedBox(height: 6),
                              Text(
                                item.lessonTag,
                                style: const TextStyle(
                                    fontSize: 13,
                                    fontWeight: FontWeight.w500),
                                maxLines: 2,
                                overflow: TextOverflow.ellipsis,
                                textAlign: TextAlign.center,
                              ),
                            ],
                          ),
                        ),
                      );
                    },
                  ),
                )],
            );
          }
        },
      ),
      bottomNavigationBar: CustomBottomNavBar(
        currentIndex: _currentBottomNavIndex,
        onTap: _onBottomNavItemTapped,
      ),
    );
  }
}