import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:travel_mate/data/models/trip.dart';
import '../../blocs/user/user_bloc.dart';
import '../../blocs/user/user_state.dart' as user_state;
import '../../blocs/trip/trip_bloc.dart';
import '../../blocs/trip/trip_event.dart';
import '../../blocs/group/group_bloc.dart';
import '../../blocs/group/group_event.dart';
import '../../data/models/group.dart';
import '../../services/user_service.dart';

class CreateTripContent extends StatefulWidget {
  const CreateTripContent({super.key});

  @override
  State<CreateTripContent> createState() => _CreateTripContentState();
}

class _CreateTripContentState extends State<CreateTripContent> {
  final _formKey = GlobalKey<FormState>();
  final _titleController = TextEditingController();
  final _descriptionController = TextEditingController();
  final _locationController = TextEditingController();
  final _budgetController = TextEditingController();
  final _userService = UserService();

  DateTime? _startDate;
  DateTime? _endDate;
  bool _isLoading = false;

  final List<String> _participants = [];
  final _participantController = TextEditingController();

  @override
  void dispose() {
    _titleController.dispose();
    _descriptionController.dispose();
    _locationController.dispose();
    _budgetController.dispose();
    _participantController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<UserBloc, user_state.UserState>(
      builder: (context, userState) {
        if (userState is! user_state.UserLoaded) {
          return Scaffold(
            appBar: AppBar(title: Text('Créer un voyage')),
            body: Center(child: Text('Veuillez vous connecter')),
          );
        }

        return Scaffold(
          appBar: AppBar(
            title: Text('Créer un voyage'),
            backgroundColor: Theme.of(context).colorScheme.primary,
            foregroundColor: Colors.white,
          ),
          body: SingleChildScrollView(
            padding: EdgeInsets.all(16),
            child: Form(
              key: _formKey,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  _buildSectionTitle('Informations générales'),
                  SizedBox(height: 16),

                  TextFormField(
                    controller: _titleController,
                    validator: (value) {
                      if (value == null || value.trim().isEmpty) {
                        return 'Titre requis';
                      }
                      return null;
                    },
                    decoration: InputDecoration(
                      labelText: 'Titre du voyage *',
                      hintText: 'ex: Voyage à Paris',
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      prefixIcon: Icon(Icons.travel_explore),
                    ),
                  ),

                  SizedBox(height: 16),

                  TextFormField(
                    controller: _descriptionController,
                    maxLines: 3,
                    decoration: InputDecoration(
                      labelText: 'Description',
                      hintText: 'Décrivez votre voyage...',
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      prefixIcon: Icon(Icons.description),
                    ),
                  ),

                  SizedBox(height: 16),

                  TextFormField(
                    controller: _locationController,
                    validator: (value) {
                      if (value == null || value.trim().isEmpty) {
                        return 'Destination requise';
                      }
                      return null;
                    },
                    decoration: InputDecoration(
                      labelText: 'Destination *',
                      hintText: 'ex: Paris, France',
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      prefixIcon: Icon(Icons.location_on),
                    ),
                  ),

                  SizedBox(height: 24),

                  _buildSectionTitle('Dates du voyage'),
                  SizedBox(height: 16),

                  Row(
                    children: [
                      Expanded(
                        child: _buildDateField(
                          label: 'Date de début *',
                          date: _startDate,
                          onTap: () => _selectStartDate(context),
                        ),
                      ),
                      SizedBox(width: 16),
                      Expanded(
                        child: _buildDateField(
                          label: 'Date de fin *',
                          date: _endDate,
                          onTap: () => _selectEndDate(context),
                        ),
                      ),
                    ],
                  ),

                  SizedBox(height: 24),

                  _buildSectionTitle('Budget'),
                  SizedBox(height: 16),

                  TextFormField(
                    controller: _budgetController,
                    keyboardType: TextInputType.numberWithOptions(decimal: true),
                    decoration: InputDecoration(
                      labelText: 'Budget estimé',
                      hintText: 'ex: 1200.50',
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      prefixIcon: Icon(Icons.euro),
                      suffixText: '€',
                    ),
                  ),

                  SizedBox(height: 24),

                  _buildSectionTitle('Participants'),
                  SizedBox(height: 8),
                  Text(
                    'Ajoutez les emails des personnes que vous souhaitez inviter',
                    style: TextStyle(color: Colors.grey[600], fontSize: 14),
                  ),
                  SizedBox(height: 16),

                  Row(
                    children: [
                      Expanded(
                        child: TextFormField(
                          controller: _participantController,
                          keyboardType: TextInputType.emailAddress,
                          decoration: InputDecoration(
                            labelText: 'Email du participant',
                            hintText: 'ex: ami@email.com',
                            border: OutlineInputBorder(
                              borderRadius: BorderRadius.circular(12),
                            ),
                            prefixIcon: Icon(Icons.person_add),
                          ),
                        ),
                      ),
                      SizedBox(width: 8),
                      ElevatedButton(
                        onPressed: _addParticipant,
                        style: ElevatedButton.styleFrom(
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(12),
                          ),
                          padding: EdgeInsets.all(16),
                        ),
                        child: Icon(Icons.add),
                      ),
                    ],
                  ),

                  SizedBox(height: 16),

                  if (_participants.isNotEmpty) ...[
                    Text(
                      'Participants ajoutés (${_participants.length})',
                      style: TextStyle(fontWeight: FontWeight.w500),
                    ),
                    SizedBox(height: 8),
                    Container(
                      width: double.infinity,
                      padding: EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey[300]!),
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: Wrap(
                        spacing: 8,
                        runSpacing: 8,
                        children: _participants
                            .map(
                              (email) => Chip(
                                label: Text(email, style: TextStyle(fontSize: 12)),
                                deleteIcon: Icon(Icons.close, size: 18),
                                onDeleted: () => _removeParticipant(email),
                                backgroundColor: Theme.of(
                                  context,
                                ).colorScheme.primary.withAlpha(25),
                              ),
                            )
                            .toList(),
                      ),
                    ),
                  ],

                  SizedBox(height: 32),

                  SizedBox(
                    width: double.infinity,
                    height: 50,
                    child: ElevatedButton(
                      onPressed: _isLoading ? null : () => _saveTrip(userState.user),
                      style: ElevatedButton.styleFrom(
                        backgroundColor: Theme.of(context).colorScheme.primary,
                        foregroundColor: Colors.white,
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(12),
                        ),
                      ),
                      child: _isLoading
                          ? CircularProgressIndicator(color: Colors.white)
                          : Text(
                              'Créer le voyage',
                              style: TextStyle(
                                fontSize: 16,
                                fontWeight: FontWeight.bold,
                              ),
                            ),
                    ),
                  ),

                  SizedBox(height: 20),
                ],
              ),
            ),
          ),
        );
      },
    );
  }

  Widget _buildSectionTitle(String title) {
    return Text(
      title,
      style: TextStyle(
        fontSize: 18,
        fontWeight: FontWeight.bold,
        color: Colors.grey[700],
      ),
    );
  }

  Widget _buildDateField({
    required String label,
    required DateTime? date,
    required VoidCallback onTap,
  }) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    final textColor = isDarkMode ? Colors.white : Colors.black;
    final labelColor = isDarkMode ? Colors.white70 : Colors.grey[600];
    final iconColor = isDarkMode ? Colors.white70 : Colors.grey[600];
    final placeholderColor = isDarkMode ? Colors.white38 : Colors.grey[500];
    
    return InkWell(
      onTap: onTap,
      child: Container(
        padding: EdgeInsets.all(16),
        decoration: BoxDecoration(
          border: Border.all(color: isDarkMode ? Colors.white24 : Colors.grey[400]!),
          borderRadius: BorderRadius.circular(12),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(label, style: TextStyle(fontSize: 12, color: labelColor)),
            SizedBox(height: 8),
            Row(
              children: [
                Icon(Icons.calendar_today, size: 16, color: iconColor),
                SizedBox(width: 8),
                Text(
                  date != null
                      ? '${date.day}/${date.month}/${date.year}'
                      : 'Sélectionner',
                  style: TextStyle(
                    fontSize: 16,
                    color: date != null ? textColor : placeholderColor,
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _selectStartDate(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: _startDate ?? DateTime.now(),
      firstDate: DateTime.now(),
      lastDate: DateTime.now().add(Duration(days: 365 * 2)),
    );
    if (picked != null) {
      setState(() {
        _startDate = picked;
        if (_endDate != null && _endDate!.isBefore(picked)) {
          _endDate = null;
        }
      });
    }
  }

  Future<void> _selectEndDate(BuildContext context) async {
    if (_startDate == null) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Veuillez d\'abord sélectionner la date de début')),
        );
      }
      return;
    }

    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: _endDate ?? _startDate!.add(Duration(days: 1)),
      firstDate: _startDate!,
      lastDate: DateTime.now().add(Duration(days: 365 * 2)),
    );
    if (picked != null && mounted) {
      setState(() {
        _endDate = picked;
      });
    }
  }

  void _addParticipant() {
    final email = _participantController.text.trim();
    if (email.isEmpty) return;

    final emailRegex = RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$');
    if (!emailRegex.hasMatch(email)) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Email invalide'))
        );
      }
      return;
    }

    if (_participants.contains(email)) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Ce participant est déjà ajouté'))
        );
      }
      return;
    }

    setState(() {
      _participants.add(email);
      _participantController.clear();
    });
  }

  void _removeParticipant(String email) {
    setState(() {
      _participants.remove(email);
    });
  }

  Future<void> _saveTrip(user_state.UserModel currentUser) async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    if (_startDate == null || _endDate == null) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Veuillez sélectionner les dates')),
        );
      }
      return;
    }

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

    try {
      // Convertir les emails en IDs
      List<String> participantIds = await _changeUserEmailById(_participants);
      
      // Ajouter le créateur
      if (!participantIds.contains(currentUser.id)) {
        participantIds.insert(0, currentUser.id);
      }

      // Créer le voyage
      final trip = Trip(
        id: '',
        title: _titleController.text.trim(),
        description: _descriptionController.text.trim(),
        location: _locationController.text.trim(),
        startDate: _startDate!,
        endDate: _endDate!,
        budget: double.tryParse(_budgetController.text) ?? 0.0,
        createdBy: currentUser.id,
        participants: participantIds,
        createdAt: DateTime.now(),
        updatedAt: DateTime.now(),
      );

      // Créer le groupe
      final group = Group(
        id: '',
        name: _titleController.text.trim(),
        members: participantIds,
      );

      // Utiliser les BLoCs pour créer
      context.read<TripBloc>().add(TripCreateRequested(trip: trip));
      context.read<GroupBloc>().add(GroupCreateRequested(group: group));

      if (mounted) {
        Navigator.pop(context, true);
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Erreur: $e'),
            backgroundColor: Colors.red,
          ),
        );
      }
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  Future<List<String>> _changeUserEmailById(List<String> participants) async {
    List<String> ids = [];

    for (String email in participants) {
      try {
        final id = await _userService.getUserIdByEmail(email);
        if (id != null) {
          ids.add(id);
        } else {
          if (mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: Text('Utilisateur non trouvé: $email'),
                backgroundColor: Colors.orange,
              ),
            );
          }
        }
      } catch (e) {
        print('Erreur: $e');
      }
    }

    return ids;
  }
}