import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/subscription_provider.dart';
import '../providers/locale_provider.dart';
import '../widgets/native_ad_widget.dart';
import '../widgets/analysis/analysis_screen_spacer.dart';
import '../widgets/analysis/subscription_pie_chart_card.dart';
import '../widgets/analysis/total_expense_summary_card.dart';
import '../widgets/analysis/monthly_expense_chart_card.dart';
import '../widgets/analysis/event_analysis_card.dart';

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

  @override
  State<AnalysisScreen> createState() => _AnalysisScreenState();
}

class _AnalysisScreenState extends State<AnalysisScreen>
    with TickerProviderStateMixin {
  late AnimationController _animationController;
  late ScrollController _scrollController;

  double _totalExpense = 0;
  List<Map<String, dynamic>> _monthlyData = [];
  bool _isLoading = true;
  String _lastDataHash = '';

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      duration: const Duration(milliseconds: 1500),
      vsync: this,
    );
    _scrollController = ScrollController();
    _loadData();
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    // Provider 변경 감지
    final provider = Provider.of<SubscriptionProvider>(context);
    final currentHash = _calculateDataHash(provider);

    debugPrint('[AnalysisScreen] didChangeDependencies: '
        '현재 해시=$currentHash, 이전 해시=$_lastDataHash, 로딩중=$_isLoading');

    // 데이터가 변경되었고 현재 로딩 중이 아닌 경우에만 리로드
    if (currentHash != _lastDataHash &&
        !_isLoading &&
        _lastDataHash.isNotEmpty) {
      debugPrint('[AnalysisScreen] 데이터 변경 감지됨, 리로드 시작');
      _loadData();
    }
  }

  @override
  void dispose() {
    _animationController.dispose();
    _scrollController.dispose();
    super.dispose();
  }

  /// 구독 데이터의 해시값을 계산하여 변경 감지
  String _calculateDataHash(SubscriptionProvider provider) {
    final subscriptions = provider.subscriptions;
    final buffer = StringBuffer();

    buffer.write(subscriptions.length);
    buffer.write('_');
    buffer.write(provider.totalMonthlyExpense.toStringAsFixed(2));

    for (final sub in subscriptions) {
      buffer.write(
          '_${sub.id}_${sub.currentPrice.toStringAsFixed(2)}_${sub.currency}');
    }

    return buffer.toString();
  }

  Future<void> _loadData() async {
    debugPrint('[AnalysisScreen] _loadData 호출됨');
    setState(() {
      _isLoading = true;
    });

    final provider = Provider.of<SubscriptionProvider>(context, listen: false);
    final localeProvider = Provider.of<LocaleProvider>(context, listen: false);
    final locale = localeProvider.locale.languageCode;

    // 총 지출 계산 (로케일별 기본 통화로 환산)
    _totalExpense = await provider.calculateTotalExpense(locale: locale);
    debugPrint('[AnalysisScreen] 총 지출 계산 완료: $_totalExpense');

    // 월별 데이터 계산 (로케일별 기본 통화로 환산)
    _monthlyData = await provider.getMonthlyExpenseData(locale: locale);
    debugPrint('[AnalysisScreen] 월별 데이터 계산 완료: ${_monthlyData.length}개월');

    // 현재 데이터 해시값 저장
    _lastDataHash = _calculateDataHash(provider);
    debugPrint('[AnalysisScreen] 데이터 해시값 저장: $_lastDataHash');

    setState(() {
      _isLoading = false;
    });

    // 데이터 로드 완료 후 애니메이션 시작
    _animationController.reset();
    _animationController.forward();
  }

  Widget _buildAnimatedAd() {
    return FadeTransition(
      opacity: CurvedAnimation(
        parent: _animationController,
        curve: const Interval(0.0, 0.5, curve: Curves.easeOut),
      ),
      child: SlideTransition(
        position: Tween<Offset>(
          begin: const Offset(0, 0.2),
          end: Offset.zero,
        ).animate(CurvedAnimation(
          parent: _animationController,
          curve: const Interval(0.0, 0.5, curve: Curves.easeOut),
        )),
        child: const NativeAdWidget(key: ValueKey('analysis_ad')),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    // Provider를 직접 사용하여 변경 감지
    final provider = Provider.of<SubscriptionProvider>(context);
    final subscriptions = provider.subscriptions;

    if (_isLoading) {
      return const Center(
        child: CircularProgressIndicator(),
      );
    }

    return CustomScrollView(
      controller: _scrollController,
      physics: const BouncingScrollPhysics(),
      slivers: <Widget>[
        SliverToBoxAdapter(
          child: SizedBox(
            height: kToolbarHeight + MediaQuery.of(context).padding.top,
          ),
        ),

        // 네이티브 광고 위젯
        SliverToBoxAdapter(
          child: _buildAnimatedAd(),
        ),

        const AnalysisScreenSpacer(),

        // 1. 구독 비율 파이 차트
        SubscriptionPieChartCard(
          subscriptions: subscriptions,
          animationController: _animationController,
        ),

        const AnalysisScreenSpacer(),

        // 2. 총 지출 요약 카드
        TotalExpenseSummaryCard(
          key: ValueKey('total_expense_$_lastDataHash'),
          subscriptions: subscriptions,
          totalExpense: _totalExpense,
          animationController: _animationController,
        ),

        const AnalysisScreenSpacer(),

        // 3. 월별 지출 차트
        MonthlyExpenseChartCard(
          key: ValueKey('monthly_expense_$_lastDataHash'),
          monthlyData: _monthlyData,
          animationController: _animationController,
        ),

        const AnalysisScreenSpacer(),

        // 4. 이벤트 분석
        EventAnalysisCard(
          animationController: _animationController,
        ),

        // FloatingNavigationBar를 위한 충분한 하단 여백
        SliverToBoxAdapter(
          child: SizedBox(
            height: 120 + MediaQuery.of(context).padding.bottom,
          ),
        ),
      ],
    );
  }
}