import 'package:flutter/material.dart';
import '../models/subscription_model.dart';
import '../widgets/subscription_group_header.dart';
import '../widgets/swipeable_subscription_card.dart';
import '../widgets/staggered_list_animation.dart';
import '../widgets/app_navigator.dart';
import 'package:provider/provider.dart';
import '../providers/subscription_provider.dart';
import '../providers/locale_provider.dart';
import '../services/subscription_url_matcher.dart';
import './dialogs/delete_confirmation_dialog.dart';
import './common/snackbar/app_snackbar.dart';
import '../l10n/app_localizations.dart';
import '../utils/logger.dart';
import '../utils/billing_cost_util.dart';
import '../utils/subscription_grouping_helper.dart';
import 'native_ad_widget.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';

/// 카테고리별로 구독 목록을 표시하는 위젯
class SubscriptionListWidget extends StatelessWidget {
  final List<SubscriptionGroupData> groups;
  final AnimationController fadeController;

  const SubscriptionListWidget({
    super.key,
    required this.groups,
    required this.fadeController,
  });

  @override
  Widget build(BuildContext context) {
    final sections = groups;
    int itemCounter = 0;
    final List<Widget> children = [];

    for (final group in sections) {
      final subscriptions = group.subscriptions;
      final List<Widget> subscriptionItems = [];

      for (var subIndex = 0; subIndex < subscriptions.length; subIndex++) {
        // 각 구독의 지연값 계산 (순차적으로 나타나도록)
        final delay = 0.05 * subIndex;
        const animationBegin = 0.2;
        const animationEnd = 1.0;
        final intervalStart = delay;
        final intervalEnd = intervalStart + 0.4;

        // 간격 계산 (0.0~1.0 사이의 값으로 정규화)
        final intervalStartNormalized = intervalStart.clamp(0.0, 0.9);
        final intervalEndNormalized = intervalEnd.clamp(0.1, 1.0);

        subscriptionItems.add(
          FadeTransition(
            opacity: Tween<double>(begin: animationBegin, end: animationEnd)
                .animate(CurvedAnimation(
                    parent: fadeController,
                    curve: Interval(
                        intervalStartNormalized, intervalEndNormalized,
                        curve: Curves.easeOut))),
            child: Padding(
              padding:
                  const EdgeInsets.symmetric(horizontal: 16, vertical: 6.0),
              child: StaggeredAnimationItem(
                index: subIndex,
                delay: const Duration(milliseconds: 50),
                child: RepaintBoundary(
                  child: SwipeableSubscriptionCard(
                    subscription: subscriptions[subIndex],
                    keepAlive: true,
                    onTap: () {
                      Log.d(
                          '[SubscriptionListWidget] SwipeableSubscriptionCard onTap 호출됨');
                      AppNavigator.toDetail(context, subscriptions[subIndex]);
                    },
                    onDelete: () async {
                      // 현재 로케일에 맞는 서비스명 가져오기
                      final localeProvider = Provider.of<LocaleProvider>(
                        context,
                        listen: false,
                      );
                      final locale = localeProvider.locale.languageCode;
                      final displayName =
                          await SubscriptionUrlMatcher.getServiceDisplayName(
                        serviceName: subscriptions[subIndex].serviceName,
                        locale: locale,
                      );

                      // 삭제 확인 다이얼로그 표시
                      if (!context.mounted) return;
                      final shouldDelete = await DeleteConfirmationDialog.show(
                        context: context,
                        serviceName: displayName,
                      );
                      if (!context.mounted) return;

                      if (shouldDelete) {
                        // 사용자가 확인한 경우에만 삭제 진행
                        final provider = Provider.of<SubscriptionProvider>(
                          context,
                          listen: false,
                        );
                        await provider.deleteSubscription(
                          subscriptions[subIndex].id,
                        );

                        if (context.mounted) {
                          AppSnackBar.showError(
                            context: context,
                            message: AppLocalizations.of(context)
                                .subscriptionDeleted(displayName),
                            icon: Icons.delete_forever_rounded,
                          );
                        }
                      }
                    },
                  ),
                ),
              ),
            ),
          ),
        );

        itemCounter++;
        if ((itemCounter - 1) % 10 == 0) {
          subscriptionItems.add(
            NativeAdWidget(
              key: ValueKey('home_list_ad_$itemCounter'),
              aspectRatioOverride: 320 / 80,
              mediaAspectRatioOverride: MediaAspectRatio.landscape,
              templateTypeOverride: TemplateType.small,
            ),
          );
        }
      }

      children.add(
        Padding(
          padding: const EdgeInsets.only(bottom: 8.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              SubscriptionGroupHeader(
                group: group,
                subscriptionCount: subscriptions.length,
                totalCostUSD: _calculateTotalByCurrency(subscriptions, 'USD'),
                totalCostKRW: _calculateTotalByCurrency(subscriptions, 'KRW'),
                totalCostJPY: _calculateTotalByCurrency(subscriptions, 'JPY'),
                totalCostCNY: _calculateTotalByCurrency(subscriptions, 'CNY'),
              ),
              ...subscriptionItems,
            ],
          ),
        ),
      );
    }

    return SliverList(
      delegate: SliverChildListDelegate(children),
    );
  }

  /// 특정 통화의 실제 결제 금액 총 합계를 계산합니다.
  double _calculateTotalByCurrency(
      List<SubscriptionModel> subscriptions, String currency) {
    return subscriptions.where((sub) => sub.currency == currency).fold(
        0.0,
        (sum, sub) =>
            sum +
            BillingCostUtil.convertFromMonthlyCost(
              sub.currentPrice,
              sub.billingCycle,
            ));
  }
}

/// 여러 Sliver 위젯을 하나의 위젯으로 감싸는 도우미 위젯
class MultiSliver extends StatelessWidget {
  final List<Widget> children;

  const MultiSliver({
    super.key,
    required this.children,
  });

  @override
  Widget build(BuildContext context) {
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          if (index >= children.length) return null;
          return children[index];
        },
        childCount: children.length,
      ),
    );
  }
}