import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../core/api/api_client.dart';
import '../../../core/chat/chat_opening_bloc.dart';
import '../../../core/chat/session_closure_bloc.dart';
import '../../../core/pairing/pairing_bloc.dart';

class PricingBottomSheet extends StatelessWidget {
  /// If set, the bottom sheet is in "extension" mode — selecting a tier extends the session.
  final String? extensionSessionId;

  const PricingBottomSheet({super.key, this.extensionSessionId});

  /// Show for new pairing (from home screen)
  static Future<void> show(BuildContext context) {
    return showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      builder: (_) => BlocProvider(
        create: (ctx) => ChatOpeningBloc(apiClient: ctx.read<ApiClient>())..add(LoadPricing()),
        child: MultiBlocProvider(
          providers: [
            BlocProvider.value(value: context.read<PairingBloc>()),
          ],
          child: const PricingBottomSheet(),
        ),
      ),
    );
  }

  /// Show for session extension (from chat screen)
  static Future<void> showForExtension(BuildContext context, {required String sessionId}) {
    return showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      builder: (_) => BlocProvider(
        create: (ctx) => ChatOpeningBloc(apiClient: ctx.read<ApiClient>())..add(LoadPricing()),
        child: MultiBlocProvider(
          providers: [
            BlocProvider.value(value: context.read<SessionClosureBloc>()),
          ],
          child: PricingBottomSheet(extensionSessionId: sessionId),
        ),
      ),
    );
  }

  String _formatPrice(int price) {
    final str = price.toString();
    final buffer = StringBuffer();
    for (var i = 0; i < str.length; i++) {
      if (i > 0 && (str.length - i) % 3 == 0) buffer.write('.');
      buffer.write(str[i]);
    }
    return 'Rp $buffer';
  }

  @override
  Widget build(BuildContext context) {
    final isExtension = extensionSessionId != null;

    return BlocBuilder<ChatOpeningBloc, ChatOpeningState>(
      builder: (context, state) {
        if (state is PricingLoading || state is PricingInitial) {
          return const SizedBox(
            height: 200,
            child: Center(child: CircularProgressIndicator()),
          );
        }

        if (state is PricingError) {
          return SizedBox(
            height: 200,
            child: Center(child: Text(state.message)),
          );
        }

        if (state is PricingLoaded) {
          return DraggableScrollableSheet(
            initialChildSize: 0.6,
            minChildSize: 0.4,
            maxChildSize: 0.8,
            expand: false,
            builder: (_, scrollController) {
              return Padding(
                padding: const EdgeInsets.all(24),
                child: ListView(
                  controller: scrollController,
                  children: [
                    Text(
                      isExtension ? 'Perpanjang Durasi' : 'Pilih Durasi Curhat',
                      style: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                      textAlign: TextAlign.center,
                    ),
                    const SizedBox(height: 16),
                    if (!isExtension && state.freeTrialEligible) ...[
                      Card(
                        color: Colors.green.shade50,
                        child: ListTile(
                          leading: const Icon(Icons.card_giftcard, color: Colors.green),
                          title: Text('Free Trial (${state.freeTrialDurationMinutes} Menit)'),
                          subtitle: const Text('Gratis untuk pertama kali!'),
                          trailing: const Icon(Icons.arrow_forward_ios, size: 16),
                          onTap: () {
                            Navigator.of(context).pop();
                            _startPairing(context, isFreeTrial: true);
                          },
                        ),
                      ),
                      const Divider(height: 24),
                    ],
                    ...state.tiers.map((tier) => Card(
                      child: ListTile(
                        title: Text(tier.label),
                        trailing: Text(
                          _formatPrice(tier.price),
                          style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                        ),
                        onTap: () {
                          Navigator.of(context).pop();
                          if (isExtension) {
                            _requestExtension(
                              context,
                              sessionId: extensionSessionId!,
                              durationMinutes: tier.durationMinutes,
                              price: tier.price,
                            );
                          } else {
                            _startPairing(
                              context,
                              durationMinutes: tier.durationMinutes,
                              price: tier.price,
                            );
                          }
                        },
                      ),
                    )),
                  ],
                ),
              );
            },
          );
        }

        return const SizedBox.shrink();
      },
    );
  }

  void _startPairing(BuildContext context, {bool isFreeTrial = false, int? durationMinutes, int? price}) {
    context.read<PairingBloc>().add(RequestPairingWithTier(
      durationMinutes: durationMinutes,
      price: price,
      isFreeTrial: isFreeTrial,
    ));
  }

  void _requestExtension(BuildContext context, {required String sessionId, required int durationMinutes, required int price}) {
    context.read<SessionClosureBloc>().add(RequestExtension(
      sessionId: sessionId,
      durationMinutes: durationMinutes,
      price: price,
    ));
  }
}