import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:intl/intl.dart';
import '../../../../shared/design_system/unionflow_design_system.dart';
import '../../../../shared/widgets/core_card.dart';
import '../../bloc/solidarity_bloc.dart';
import '../../data/models/demande_aide_model.dart';
import '../../../authentication/presentation/bloc/auth_bloc.dart';

class DemandeAideDetailPage extends StatefulWidget {
  final String demandeId;

  const DemandeAideDetailPage({super.key, required this.demandeId});

  @override
  State<DemandeAideDetailPage> createState() => _DemandeAideDetailPageState();
}

class _DemandeAideDetailPageState extends State<DemandeAideDetailPage> {
  final _currencyFormat = NumberFormat.currency(locale: 'fr_FR', symbol: 'FCFA');

  @override
  void initState() {
    super.initState();
    context.read<SolidarityBloc>().add(LoadDemandeAideById(widget.demandeId));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: const UFAppBar(
        title: 'DÉTAIL DEMANDE',
        backgroundColor: AppColors.surface,
        foregroundColor: AppColors.textPrimaryLight,
      ),
      body: BlocConsumer<SolidarityBloc, SolidarityState>(
        listenWhen: (prev, curr) => prev.status != curr.status,
        listener: (context, state) {
          if (state.status == SolidarityStatus.error && state.message != null) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text(state.message!), backgroundColor: Colors.red),
            );
          }
        },
        buildWhen: (prev, curr) =>
            prev.demandeDetail != curr.demandeDetail || prev.status != curr.status,
        builder: (context, state) {
          if (state.status == SolidarityStatus.loading && state.demandeDetail == null) {
            return const Center(child: CircularProgressIndicator());
          }
          final d = state.demandeDetail;
          if (d == null) {
            return Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Icon(Icons.error_outline, size: 64, color: Colors.grey),
                  const SizedBox(height: 16),
                  Text(
                    'Demande introuvable',
                    style: Theme.of(context).textTheme.titleMedium,
                  ),
                ],
              ),
            );
          }
          return SingleChildScrollView(
            padding: const EdgeInsets.all(12),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _InfoCard(title: 'Référence', value: d.numeroReference ?? d.id ?? '—'),
                _InfoCard(title: 'Statut', value: d.statutLibelle),
                _InfoCard(title: 'Titre', value: d.titre ?? '—'),
                if (d.type != null) _InfoCard(title: 'Type', value: d.typeLibelle),
                if (d.description != null && d.description!.isNotEmpty)
                  _InfoCard(title: 'Description', value: d.description!),
                if (d.montantDemande != null && d.montantDemande! > 0)
                  _InfoCard(
                    title: 'Montant demandé',
                    value: _currencyFormat.format(d.montantDemande!),
                  ),
                if (d.montantAccorde != null && d.montantAccorde! > 0)
                  _InfoCard(
                    title: 'Montant accordé',
                    value: _currencyFormat.format(d.montantAccorde!),
                  ),
                if (d.demandeur != null) _InfoCard(title: 'Demandeur', value: d.demandeur!),
                if (d.dateDemande != null)
                  _InfoCard(
                    title: 'Date demande',
                    value: DateFormat('dd/MM/yyyy').format(d.dateDemande!),
                  ),
                if (d.motif != null && d.motif!.isNotEmpty)
                  _InfoCard(title: 'Motif', value: d.motif!),
                _ActionsSection(demande: d, isGestionnaire: _isGestionnaire()),
              ],
            ),
          );
        },
      ),
    );
  }

  bool _isGestionnaire() {
    final state = context.read<AuthBloc>().state;
    if (state is AuthAuthenticated) {
      return state.effectiveRole.level >= 50;
    }
    return false;
  }
}

class _InfoCard extends StatelessWidget {
  final String title;
  final String value;
  final Widget? trail;

  const _InfoCard({required this.title, required this.value, this.trail});

  @override
  Widget build(BuildContext context) {
    return CoreCard(
      margin: const EdgeInsets.only(bottom: 8),
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title.toUpperCase(),
                  style: AppTypography.subtitleSmall.copyWith(
                    fontWeight: FontWeight.bold,
                    fontSize: 9,
                    color: AppColors.textSecondaryLight,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  value,
                  style: AppTypography.bodyTextSmall.copyWith(fontSize: 12),
                ),
              ],
            ),
          ),
          if (trail != null) trail!,
        ],
      ),
    );
  }
}

class _ActionsSection extends StatelessWidget {
  final DemandeAideModel demande;
  final bool isGestionnaire;

  const _ActionsSection({required this.demande, required this.isGestionnaire});

  @override
  Widget build(BuildContext context) {
    if (!isGestionnaire) return const SizedBox.shrink();

    final bloc = context.read<SolidarityBloc>();
    if (demande.statut != 'EN_ATTENTE' && demande.statut != 'SOUMISE') {
      return const SizedBox.shrink();
    }
    if (demande.id == null) return const SizedBox.shrink();
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Padding(
          padding: const EdgeInsets.symmetric(vertical: 8),
          child: Text(
            'ACTIONS ADMINISTRATIVES',
            style: AppTypography.subtitleSmall.copyWith(
              fontWeight: FontWeight.bold,
              letterSpacing: 1.1,
            ),
          ),
        ),
        const SizedBox(height: 8),
        Row(
          children: [
            Expanded(
              child: ElevatedButton(
                onPressed: () => bloc.add(ApprouverDemandeAide(demande.id!)),
                style: ElevatedButton.styleFrom(
                  backgroundColor: AppColors.success,
                  foregroundColor: Colors.white,
                  elevation: 0,
                  padding: const EdgeInsets.symmetric(vertical: 12),
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
                ),
                child: Text('APPROUVER', style: AppTypography.actionText.copyWith(fontSize: 11, color: Colors.white)),
              ),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: OutlinedButton(
                onPressed: () => _showRejetDialog(context, demande.id!, bloc),
                style: OutlinedButton.styleFrom(
                  foregroundColor: AppColors.error,
                  side: const BorderSide(color: AppColors.error),
                  padding: const EdgeInsets.symmetric(vertical: 12),
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
                ),
                child: Text('REJETER', style: AppTypography.actionText.copyWith(fontSize: 11)),
              ),
            ),
          ],
        ),
      ],
    );
  }

  void _showRejetDialog(BuildContext context, String demandeId, SolidarityBloc bloc) {
    final motifController = TextEditingController();
    showDialog<void>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Rejeter la demande'),
        content: TextField(
          controller: motifController,
          decoration: const InputDecoration(
            labelText: 'Motif du rejet (recommandé pour traçabilité)',
            hintText: 'Saisir le motif...',
            border: OutlineInputBorder(),
          ),
          maxLines: 3,
          autofocus: true,
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('Annuler'),
          ),
          FilledButton(
            onPressed: () {
              final motif = motifController.text.trim();
              Navigator.pop(ctx);
              bloc.add(RejeterDemandeAide(demandeId, motif: motif.isNotEmpty ? motif : null));
            },
            style: FilledButton.styleFrom(backgroundColor: AppColors.error),
            child: const Text('Rejeter'),
          ),
        ],
      ),
    );
  }
}