submanager/lib/screens/analysis_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/subscription_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 = [];
  int _touchedIndex = -1;
  bool _isLoading = true;

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

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

  Future<void> _loadData() async {
    setState(() {
      _isLoading = true;
    });

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

    // 총 지출 계산
    _totalExpense = await provider.calculateTotalExpense();

    // 월별 데이터 계산
    _monthlyData = await provider.getMonthlyExpenseData();

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

    // 데이터 로드 완료 후 애니메이션 시작
    _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) {
    return Consumer<SubscriptionProvider>(
      builder: (context, provider, child) {
        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: Padding(
                padding: const EdgeInsets.all(16),
                child: _buildAnimatedAd(),
              ),
            ),

            const AnalysisScreenSpacer(),

            // 1. 구독 비율 파이 차트
            SubscriptionPieChartCard(
              subscriptions: subscriptions,
              animationController: _animationController,
              touchedIndex: _touchedIndex,
              onPieTouch: (index) => setState(() => _touchedIndex = index),
            ),

            const AnalysisScreenSpacer(),

            // 2. 총 지출 요약 카드
            TotalExpenseSummaryCard(
              subscriptions: subscriptions,
              totalExpense: _totalExpense,
              animationController: _animationController,
            ),

            const AnalysisScreenSpacer(),

            // 3. 월별 지출 차트
            MonthlyExpenseChartCard(
              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,
              ),
            ),
          ],
        );
      },
    );
  }
}