/// Dialogue d'inscription à un événement
library inscription_event_dialog;

import 'package:flutter/material.dart';
import '../../../../shared/design_system/tokens/module_colors.dart';
import '../../../../shared/design_system/tokens/color_tokens.dart';
import '../../../../shared/design_system/tokens/app_colors.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../bloc/evenements_bloc.dart';
import '../../bloc/evenements_event.dart';
import '../../bloc/evenements_state.dart';
import '../../data/models/evenement_model.dart';

class InscriptionEventDialog extends StatefulWidget {
  final EvenementModel evenement;
  final bool isInscrit;

  const InscriptionEventDialog({
    super.key,
    required this.evenement,
    this.isInscrit = false,
  });

  @override
  State<InscriptionEventDialog> createState() => _InscriptionEventDialogState();
}

class _InscriptionEventDialogState extends State<InscriptionEventDialog> {
  final _formKey = GlobalKey<FormState>();
  final _commentaireController = TextEditingController();
  bool _actionSent = false;
  
  @override
  void dispose() {
    _commentaireController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BlocListener<EvenementsBloc, EvenementsState>(
      listenWhen: (_, state) =>
          _actionSent &&
          (state is EvenementInscrit ||
              state is EvenementDesinscrit ||
              state is EvenementsError),
      listener: (context, state) {
        if (!_actionSent || !mounted) return;
        if (state is EvenementsError) {
          setState(() => _actionSent = false);
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text(state.message), backgroundColor: ColorTokens.error),
          );
          return;
        }
        if (state is EvenementInscrit || state is EvenementDesinscrit) {
          setState(() => _actionSent = false);
          Navigator.pop(context);
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Text(
                state is EvenementInscrit
                    ? 'Inscription réussie'
                    : 'Désinscription réussie',
              ),
              backgroundColor:
                  state is EvenementInscrit ? ColorTokens.success : ColorTokens.warning,
            ),
          );
        }
      },
      child: Dialog(
      child: Container(
        width: MediaQuery.of(context).size.width * 0.9,
        constraints: const BoxConstraints(maxHeight: 500),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            _buildHeader(),
            Expanded(
              child: SingleChildScrollView(
                padding: const EdgeInsets.all(16),
                child: Form(
                  key: _formKey,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      _buildEventInfo(),
                      const SizedBox(height: 16),
                      if (!widget.isInscrit) ...[
                        _buildPlacesInfo(),
                        const SizedBox(height: 16),
                        _buildCommentaireField(),
                      ] else ...[
                        _buildDesinscriptionWarning(),
                      ],
                    ],
                  ),
                ),
              ),
            ),
            _buildActionButtons(),
          ],
        ),
      ),
    ),
    );
  }

  Widget _buildHeader() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: widget.isInscrit ? ColorTokens.error : ModuleColors.evenements,
        borderRadius: const BorderRadius.only(
          topLeft: Radius.circular(4),
          topRight: Radius.circular(4),
        ),
      ),
      child: Row(
        children: [
          Icon(
            widget.isInscrit ? Icons.cancel : Icons.event_available,
            color: Colors.white,
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Text(
              widget.isInscrit ? 'Se désinscrire' : 'S\'inscrire à l\'événement',
              style: const TextStyle(
                color: Colors.white,
                fontSize: 18,
                fontWeight: FontWeight.bold,
              ),
            ),
          ),
          IconButton(
            icon: const Icon(Icons.close, color: Colors.white),
            onPressed: () => Navigator.pop(context),
          ),
        ],
      ),
    );
  }

  Widget _buildEventInfo() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: ColorTokens.infoContainer,
        border: Border.all(color: ColorTokens.infoLight),
        borderRadius: BorderRadius.circular(4),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.event, color: ModuleColors.evenements),
              const SizedBox(width: 8),
              Expanded(
                child: Text(
                  widget.evenement.titre,
                  style: const TextStyle(
                    fontSize: 16,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          Row(
            children: [
              const Icon(Icons.calendar_today, size: 16, color: AppColors.textTertiary),
              const SizedBox(width: 8),
              Text(
                _formatDate(widget.evenement.dateDebut),
                style: const TextStyle(fontSize: 14),
              ),
            ],
          ),
          if (widget.evenement.lieu != null) ...[
            const SizedBox(height: 4),
            Row(
              children: [
                const Icon(Icons.location_on, size: 16, color: AppColors.textTertiary),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    widget.evenement.lieu!,
                    style: const TextStyle(fontSize: 14),
                  ),
                ),
              ],
            ),
          ],
        ],
      ),
    );
  }

  Widget _buildPlacesInfo() {
    final placesRestantes = (widget.evenement.maxParticipants ?? 0) -
                            widget.evenement.participantsActuels;
    final isComplet = placesRestantes <= 0 && widget.evenement.maxParticipants != null;
    
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: isComplet ? ColorTokens.errorContainer : ColorTokens.successContainer,
        border: Border.all(
          color: isComplet ? ColorTokens.errorLight : ColorTokens.successLight,
        ),
        borderRadius: BorderRadius.circular(4),
      ),
      child: Row(
        children: [
          Icon(
            isComplet ? Icons.warning : Icons.check_circle,
            color: isComplet ? ColorTokens.error : ColorTokens.success,
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  isComplet ? 'Événement complet' : 'Places disponibles',
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    color: isComplet ? ColorTokens.errorDark : ColorTokens.successDark,
                  ),
                ),
                if (widget.evenement.maxParticipants != null)
                  Text(
                    '$placesRestantes places restantes sur ${widget.evenement.maxParticipants}',
                    style: const TextStyle(fontSize: 12),
                  )
                else
                  const Text(
                    'Nombre de places illimité',
                    style: TextStyle(fontSize: 12),
                  ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildCommentaireField() {
    return TextFormField(
      controller: _commentaireController,
      decoration: const InputDecoration(
        labelText: 'Commentaire (optionnel)',
        border: OutlineInputBorder(),
        prefixIcon: Icon(Icons.comment),
        hintText: 'Ajoutez un commentaire...',
      ),
      maxLines: 3,
    );
  }

  Widget _buildDesinscriptionWarning() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: ColorTokens.warningContainer,
        border: Border.all(color: ColorTokens.warningLight),
        borderRadius: BorderRadius.circular(4),
      ),
      child: const Row(
        children: [
          Icon(Icons.warning, color: ColorTokens.warning),
          SizedBox(width: 12),
          Expanded(
            child: Text(
              'Êtes-vous sûr de vouloir vous désinscrire de cet événement ?',
              style: TextStyle(fontSize: 14),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildActionButtons() {
    final placesRestantes = (widget.evenement.maxParticipants ?? 0) -
                            widget.evenement.participantsActuels;
    final isComplet = placesRestantes <= 0 && widget.evenement.maxParticipants != null;
    
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Theme.of(context).colorScheme.surfaceContainerHighest,
        border: Border(top: BorderSide(color: Theme.of(context).colorScheme.outline)),
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('Annuler'),
          ),
          const SizedBox(width: 12),
          ElevatedButton(
            onPressed: (widget.isInscrit || !isComplet) ? _submitForm : null,
            style: ElevatedButton.styleFrom(
              backgroundColor: widget.isInscrit ? ColorTokens.error : ModuleColors.evenements,
              foregroundColor: Colors.white,
            ),
            child: Text(widget.isInscrit ? 'Se désinscrire' : 'S\'inscrire'),
          ),
        ],
      ),
    );
  }

  String _formatDate(DateTime date) {
    final months = [
      'janvier', 'février', 'mars', 'avril', 'mai', 'juin',
      'juillet', 'août', 'septembre', 'octobre', 'novembre', 'décembre'
    ];
    return '${date.day} ${months[date.month - 1]} ${date.year} à ${date.hour}:${date.minute.toString().padLeft(2, '0')}';
  }

  void _submitForm() {
    setState(() => _actionSent = true);
    if (widget.isInscrit) {
      context.read<EvenementsBloc>().add(DesinscrireEvenement(widget.evenement.id!.toString()));
    } else {
      context.read<EvenementsBloc>().add(
        InscrireEvenement(widget.evenement.id!.toString()),
      );
    }
  }
}