import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:flutter/services.dart';
import 'package:go_router/go_router.dart';
import 'package:intl/intl.dart';
import '../../../../core/services/auth_service.dart';
import '../../../../core/theme/app_colors.dart';
import '../../../../core/theme/app_theme_extension.dart';

/// Página para visualizar os alunos de uma turma específica
class ClassStudentsPage extends StatefulWidget {
  final String classId;
  final String className;

  const ClassStudentsPage({
    super.key,
    required this.classId,
    required this.className,
  });

  @override
  State<ClassStudentsPage> createState() => _ClassStudentsPageState();
}

class _ClassStudentsPageState extends State<ClassStudentsPage> {
  bool _isCheckingAccess = true;
  bool _accessGranted = false;
  String _currentClassName = '';
  String? _classCode;

  @override
  void initState() {
    super.initState();
    _currentClassName = widget.className;
    _verifyOwnership();
  }

  Future<void> _verifyOwnership() async {
    final currentUser = AuthService.currentUser;
    if (currentUser == null) {
      setState(() {
        _isCheckingAccess = false;
        _accessGranted = false;
      });
      return;
    }

    final role = await AuthService.getUserRole(currentUser.uid);
    if (role != 'teacher') {
      setState(() {
        _isCheckingAccess = false;
        _accessGranted = false;
      });
      return;
    }

    final classDoc = await FirebaseFirestore.instance
        .collection('classes')
        .doc(widget.classId)
        .get();

    final teacherId = classDoc.data()?['teacherId'] as String?;
    final code = classDoc.data()?['code'] as String?;

    setState(() {
      _isCheckingAccess = false;
      _accessGranted = classDoc.exists && teacherId == currentUser.uid;
      _classCode = code ?? '----';
    });
  }

  Future<void> _updateClassName(String newName) async {
    try {
      await FirebaseFirestore.instance
          .collection('classes')
          .doc(widget.classId)
          .update({'name': newName});

      setState(() {
        _currentClassName = newName;
      });

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Row(
              children: [
                const Icon(Icons.check_circle, color: Colors.white),
                const SizedBox(width: 12),
                const Text('Nome da turma atualizado com sucesso'),
              ],
            ),
            backgroundColor: Colors.green,
            behavior: SnackBarBehavior.floating,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(10),
            ),
            duration: const Duration(seconds: 3),
          ),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Row(
              children: [
                const Icon(Icons.error_outline, color: Colors.white),
                const SizedBox(width: 12),
                Text('Erro ao atualizar nome: $e'),
              ],
            ),
            backgroundColor: Colors.red,
            behavior: SnackBarBehavior.floating,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(10),
            ),
            duration: const Duration(seconds: 4),
          ),
        );
      }
    }
  }

  Future<void> _deleteClass() async {
    try {
      // Delete all enrollments first
      final enrollmentsSnapshot = await FirebaseFirestore.instance
          .collection('enrollments')
          .where('classId', isEqualTo: widget.classId)
          .get();

      final batch = FirebaseFirestore.instance.batch();
      for (final doc in enrollmentsSnapshot.docs) {
        batch.delete(doc.reference);
      }
      await batch.commit();

      // Delete the class
      await FirebaseFirestore.instance
          .collection('classes')
          .doc(widget.classId)
          .delete();

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Row(
              children: [
                const Icon(Icons.check_circle, color: Colors.white),
                const SizedBox(width: 12),
                const Text('Turma eliminada com sucesso'),
              ],
            ),
            backgroundColor: Colors.green,
            behavior: SnackBarBehavior.floating,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(10),
            ),
            duration: const Duration(seconds: 3),
          ),
        );
        context.pop();
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Row(
              children: [
                const Icon(Icons.error_outline, color: Colors.white),
                const SizedBox(width: 12),
                Text('Erro ao eliminar turma: $e'),
              ],
            ),
            backgroundColor: Colors.red,
            behavior: SnackBarBehavior.floating,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(10),
            ),
            duration: const Duration(seconds: 4),
          ),
        );
      }
    }
  }

  void _showEditClassNameDialog() {
    final textController = TextEditingController(text: _currentClassName);

    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        title: Row(
          children: [
            Icon(Icons.edit, color: Theme.of(context).colorScheme.primary),
            const SizedBox(width: 8),
            const Text('Editar Nome'),
          ],
        ),
        content: TextField(
          controller: textController,
          decoration: InputDecoration(
            labelText: 'Nome da Turma',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            prefixIcon: const Icon(Icons.school),
          ),
          autofocus: true,
          maxLength: 50,
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Cancelar'),
          ),
          FilledButton(
            onPressed: () {
              final newName = textController.text.trim();
              if (newName.isNotEmpty && newName != _currentClassName) {
                Navigator.of(context).pop();
                _updateClassName(newName);
              }
            },
            child: const Text('Guardar'),
          ),
        ],
      ),
    );
  }

  void _showDeleteClassDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        title: Row(
          children: [
            Icon(Icons.warning, color: Theme.of(context).colorScheme.error),
            const SizedBox(width: 8),
            const Text('Eliminar Turma'),
          ],
        ),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              'Tens a certeza que desejas eliminar a turma "$_currentClassName"?',
              style: const TextStyle(fontSize: 14),
            ),
            const SizedBox(height: 12),
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Theme.of(
                  context,
                ).colorScheme.error.withValues(alpha: 0.1),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(
                  color: Theme.of(
                    context,
                  ).colorScheme.error.withValues(alpha: 0.3),
                ),
              ),
              child: Row(
                children: [
                  Icon(
                    Icons.warning_amber,
                    color: Theme.of(context).colorScheme.error,
                    size: 20,
                  ),
                  const SizedBox(width: 8),
                  Expanded(
                    child: Text(
                      'Esta ação não pode ser desfeita. Todos os alunos serão removidos.',
                      style: TextStyle(
                        fontSize: 12,
                        color: Theme.of(context).colorScheme.error,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Cancelar'),
          ),
          FilledButton(
            onPressed: () {
              Navigator.of(context).pop();
              _deleteClass();
            },
            style: FilledButton.styleFrom(
              backgroundColor: Theme.of(context).colorScheme.error,
              foregroundColor: Colors.white,
            ),
            child: const Text('Eliminar'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final themeExtras = AppThemeExtras.of(context);

    if (_isCheckingAccess) {
      return Scaffold(
        backgroundColor: cs.surface,
        body: Center(child: CircularProgressIndicator(color: cs.primary)),
      );
    }

    if (!_accessGranted) {
      return Scaffold(
        backgroundColor: cs.surface,
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(32.0),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(Icons.lock_outline, size: 64, color: cs.primary),
                const SizedBox(height: 24),
                Text(
                  'Sem permissão',
                  style: TextStyle(
                    color: cs.onSurface,
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                const SizedBox(height: 12),
                Text(
                  'Só podes ver os alunos das tuas próprias turmas.',
                  style: TextStyle(color: cs.onSurfaceVariant, fontSize: 14),
                  textAlign: TextAlign.center,
                ),
              ],
            ),
          ),
        ),
      );
    }

    return Scaffold(
      body: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: themeExtras.dashboardBackgroundGradient,
            stops: themeExtras.dashboardGradientStops,
          ),
        ),
        child: SafeArea(
          top: false,
          child: Column(
            children: [
              // Custom AppBar
              _buildAppBar(cs),
              // Main Content
              Expanded(
                child: StreamBuilder<QuerySnapshot>(
                  stream: FirebaseFirestore.instance
                      .collection('enrollments')
                      .where('classId', isEqualTo: widget.classId)
                      .orderBy('joinedAt', descending: true)
                      .snapshots(),
                  builder: (context, snapshot) {
                    if (snapshot.connectionState == ConnectionState.waiting) {
                      return Center(
                        child: CircularProgressIndicator(color: cs.primary),
                      );
                    }

                    if (snapshot.hasError) {
                      return Center(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Icon(
                              Icons.error_outline,
                              size: 48,
                              color: cs.onSurfaceVariant,
                            ),
                            const SizedBox(height: 16),
                            Text(
                              'Erro ao carregar alunos',
                              style: TextStyle(
                                color: cs.onSurfaceVariant,
                                fontSize: 16,
                              ),
                            ),
                          ],
                        ),
                      );
                    }

                    final enrollments = snapshot.data?.docs ?? [];

                    if (enrollments.isEmpty) {
                      return _buildEmptyState(cs);
                    }

                    return _buildStudentsList(cs, enrollments);
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildAppBar(ColorScheme cs) {
    return Container(
      padding: const EdgeInsets.only(left: 16, right: 16, top: 52, bottom: 16),
      child: Column(
        children: [
          // Top Row with Back and Actions
          Row(
            children: [
              Container(
                decoration: BoxDecoration(
                  color: Colors.white.withValues(alpha: 0.2),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: IconButton(
                  icon: const Icon(Icons.arrow_back, color: Colors.white),
                  onPressed: () => context.pop(),
                  tooltip: 'Voltar',
                ),
              ),
              const Spacer(),
              // Edit Button
              Container(
                decoration: BoxDecoration(
                  color: Colors.white.withValues(alpha: 0.2),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: IconButton(
                  icon: const Icon(Icons.edit, color: Colors.white),
                  onPressed: _showEditClassNameDialog,
                  tooltip: 'Editar nome',
                ),
              ),
              const SizedBox(width: 8),
              // Delete Button
              Container(
                decoration: BoxDecoration(
                  color:
                      (Theme.of(context).brightness == Brightness.dark
                              ? DarkBrandColors.primaryOrange
                              : AppColors.primaryOrange)
                          .withValues(alpha: 0.2),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: IconButton(
                  icon: Icon(
                    Icons.delete_outline,
                    color: Theme.of(context).brightness == Brightness.dark
                        ? DarkBrandColors.primaryOrange
                        : AppColors.primaryOrange,
                  ),
                  onPressed: _showDeleteClassDialog,
                  tooltip: 'Eliminar turma',
                ),
              ),
            ],
          ),
          const SizedBox(height: 20),
          // Class Info Card
          Container(
            width: double.infinity,
            padding: const EdgeInsets.all(20),
            decoration: BoxDecoration(
              color: Colors.white.withValues(alpha: 0.15),
              borderRadius: BorderRadius.circular(20),
              border: Border.all(
                color: Colors.white.withValues(alpha: 0.2),
                width: 1,
              ),
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        color: Colors.white.withValues(alpha: 0.2),
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: const Icon(
                        Icons.school,
                        color: Colors.white,
                        size: 28,
                      ),
                    ),
                    const SizedBox(width: 16),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            _currentClassName,
                            style: const TextStyle(
                              color: Colors.white,
                              fontSize: 24,
                              fontWeight: FontWeight.bold,
                            ),
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                          ),
                          const SizedBox(height: 4),
                          Text(
                            'Código: $_classCode',
                            style: TextStyle(
                              color: Colors.white.withValues(alpha: 0.8),
                              fontSize: 14,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 16),
                // Stats Row
                Container(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 16,
                    vertical: 12,
                  ),
                  decoration: BoxDecoration(
                    color: Colors.white.withValues(alpha: 0.1),
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: StreamBuilder<QuerySnapshot>(
                    stream: FirebaseFirestore.instance
                        .collection('enrollments')
                        .where('classId', isEqualTo: widget.classId)
                        .snapshots(),
                    builder: (context, snapshot) {
                      final count = snapshot.data?.docs.length ?? 0;
                      return Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          const Icon(
                            Icons.people,
                            color: Colors.white,
                            size: 20,
                          ),
                          const SizedBox(width: 8),
                          Text(
                            '$count ${count == 1 ? 'aluno matriculado' : 'alunos matriculados'}',
                            style: const TextStyle(
                              color: Colors.white,
                              fontSize: 14,
                              fontWeight: FontWeight.w500,
                            ),
                          ),
                        ],
                      );
                    },
                  ),
                ),
              ],
            ),
          ).animate().fadeIn(
            duration: const Duration(milliseconds: 400),
            curve: Curves.easeOut,
          ),
        ],
      ),
    );
  }

  Widget _buildEmptyState(ColorScheme cs) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(24),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const SizedBox(height: 40),
          Container(
                padding: const EdgeInsets.all(24),
                decoration: BoxDecoration(
                  color: cs.surface,
                  borderRadius: BorderRadius.circular(24),
                  boxShadow: [
                    BoxShadow(
                      color: cs.shadow.withValues(alpha: 0.08),
                      blurRadius: 20,
                      offset: const Offset(0, 8),
                    ),
                  ],
                ),
                child: Column(
                  children: [
                    Icon(
                      Icons.people_outline,
                      size: 80,
                      color: cs.primary.withValues(alpha: 0.5),
                    ),
                    const SizedBox(height: 24),
                    Text(
                      'Nenhum aluno entrou nesta turma ainda.',
                      style: TextStyle(
                        color: cs.onSurface,
                        fontSize: 18,
                        fontWeight: FontWeight.w600,
                      ),
                      textAlign: TextAlign.center,
                    ),
                    const SizedBox(height: 12),
                    Text(
                      'Partilha o código da turma para os alunos se juntarem.',
                      style: TextStyle(
                        color: cs.onSurfaceVariant,
                        fontSize: 14,
                      ),
                      textAlign: TextAlign.center,
                    ),
                    const SizedBox(height: 24),
                    GestureDetector(
                      onTap: _copyCodeToClipboard,
                      child: Container(
                        padding: const EdgeInsets.symmetric(
                          horizontal: 20,
                          vertical: 12,
                        ),
                        decoration: BoxDecoration(
                          color: cs.primary.withValues(alpha: 0.1),
                          borderRadius: BorderRadius.circular(12),
                          border: Border.all(
                            color: cs.primary.withValues(alpha: 0.3),
                          ),
                        ),
                        child: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            Icon(Icons.copy, color: cs.primary, size: 18),
                            const SizedBox(width: 8),
                            Text(
                              'Código: $_classCode',
                              style: TextStyle(
                                color: cs.primary,
                                fontSize: 16,
                                fontWeight: FontWeight.bold,
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ],
                ),
              )
              .animate()
              .fadeIn(
                duration: const Duration(milliseconds: 400),
                curve: Curves.easeOut,
              )
              .then(delay: const Duration(milliseconds: 100)),
        ],
      ),
    );
  }

  Widget _buildStudentsList(
    ColorScheme cs,
    List<QueryDocumentSnapshot> enrollments,
  ) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Section Title
          Container(
            margin: const EdgeInsets.only(bottom: 16, left: 8),
            child: Row(
              children: [
                Icon(Icons.people, color: cs.onSurface, size: 20),
                const SizedBox(width: 8),
                Text(
                  'Alunos Matriculados',
                  style: TextStyle(
                    color: cs.onSurface,
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                const SizedBox(width: 8),
                Container(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 8,
                    vertical: 4,
                  ),
                  decoration: BoxDecoration(
                    color: cs.primary.withValues(alpha: 0.1),
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: Text(
                    '${enrollments.length}',
                    style: TextStyle(
                      color: cs.primary,
                      fontSize: 12,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
              ],
            ),
          ),
          // Students List
          ...enrollments.asMap().entries.map((entry) {
            final index = entry.key;
            final enrollment = entry.value.data() as Map<String, dynamic>;
            final studentName =
                enrollment['studentName'] as String? ?? 'Aluno sem nome';
            final joinedAt = enrollment['joinedAt'] as Timestamp?;
            final enrollmentId = entry.value.id;

            return _buildStudentCard(
              cs,
              studentName,
              joinedAt,
              enrollmentId,
              index,
            );
          }),
          const SizedBox(height: 24),
        ],
      ),
    );
  }

  Widget _buildStudentCard(
    ColorScheme cs,
    String studentName,
    Timestamp? joinedAt,
    String enrollmentId,
    int index,
  ) {
    return Container(
          margin: const EdgeInsets.only(bottom: 12),
          decoration: BoxDecoration(
            color: cs.surface,
            borderRadius: BorderRadius.circular(16),
            boxShadow: [
              BoxShadow(
                color: cs.shadow.withValues(alpha: 0.06),
                blurRadius: 12,
                offset: const Offset(0, 4),
              ),
            ],
          ),
          child: Material(
            color: Colors.transparent,
            borderRadius: BorderRadius.circular(16),
            child: InkWell(
              borderRadius: BorderRadius.circular(16),
              onTap: null,
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Row(
                  children: [
                    // Avatar
                    Container(
                      width: 52,
                      height: 52,
                      decoration: BoxDecoration(
                        gradient: LinearGradient(
                          begin: Alignment.topLeft,
                          end: Alignment.bottomRight,
                          colors: [
                            cs.primary.withValues(alpha: 0.8),
                            cs.primary.withValues(alpha: 0.4),
                          ],
                        ),
                        borderRadius: BorderRadius.circular(14),
                      ),
                      child: Center(
                        child: Text(
                          studentName.isNotEmpty
                              ? studentName[0].toUpperCase()
                              : '?',
                          style: const TextStyle(
                            color: Colors.white,
                            fontSize: 22,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ),
                    ),
                    const SizedBox(width: 16),
                    // Info
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            studentName,
                            style: TextStyle(
                              color: cs.onSurface,
                              fontSize: 16,
                              fontWeight: FontWeight.w600,
                            ),
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                          ),
                          const SizedBox(height: 4),
                          Text(
                            joinedAt != null
                                ? 'Entrou em ${_formatDate(joinedAt.toDate())}'
                                : 'Data desconhecida',
                            style: TextStyle(
                              color: cs.onSurfaceVariant,
                              fontSize: 13,
                            ),
                          ),
                        ],
                      ),
                    ),
                    // Delete Button
                    Container(
                      decoration: BoxDecoration(
                        color: cs.error.withValues(alpha: 0.1),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: IconButton(
                        icon: Icon(
                          Icons.delete_outline,
                          color: cs.error,
                          size: 20,
                        ),
                        onPressed: () => _showRemoveStudentDialog(
                          context,
                          enrollmentId,
                          studentName,
                        ),
                        tooltip: 'Remover aluno',
                        padding: const EdgeInsets.all(10),
                        constraints: const BoxConstraints(),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        )
        .animate()
        .fadeIn(
          duration: const Duration(milliseconds: 300),
          curve: Curves.easeOut,
        )
        .then(delay: Duration(milliseconds: index * 50));
  }

  String _formatDate(DateTime date) {
    return DateFormat('dd/MM/yyyy').format(date);
  }

  void _copyCodeToClipboard() {
    Clipboard.setData(ClipboardData(text: _classCode ?? ''));
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Row(
          children: [
            const Icon(Icons.check_circle, color: Colors.white),
            const SizedBox(width: 12),
            const Text('Código copiado!'),
          ],
        ),
        backgroundColor: Colors.green,
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
        duration: const Duration(seconds: 2),
      ),
    );
  }

  Future<void> _showRemoveStudentDialog(
    BuildContext context,
    String enrollmentId,
    String studentName,
  ) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        title: Row(
          children: [
            Icon(
              Icons.person_remove,
              color: Theme.of(context).colorScheme.error,
            ),
            const SizedBox(width: 8),
            const Text('Remover Aluno'),
          ],
        ),
        content: Text(
          'Tens a certeza que desejas remover $studentName desta turma?',
          style: const TextStyle(fontSize: 14),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(false),
            child: const Text('Cancelar'),
          ),
          FilledButton(
            onPressed: () => Navigator.of(context).pop(true),
            style: FilledButton.styleFrom(
              backgroundColor: Theme.of(context).colorScheme.error,
              foregroundColor: Colors.white,
            ),
            child: const Text('Remover'),
          ),
        ],
      ),
    );

    if (confirmed == true && context.mounted) {
      try {
        await FirebaseFirestore.instance
            .collection('enrollments')
            .doc(enrollmentId)
            .delete();

        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Row(
                children: [
                  const Icon(Icons.check_circle, color: Colors.white),
                  const SizedBox(width: 12),
                  const Text('Aluno removido com sucesso'),
                ],
              ),
              backgroundColor: Colors.green,
              behavior: SnackBarBehavior.floating,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(10),
              ),
              duration: const Duration(seconds: 3),
            ),
          );
        }
      } catch (e) {
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Row(
                children: [
                  const Icon(Icons.error_outline, color: Colors.white),
                  const SizedBox(width: 12),
                  Text('Erro ao remover aluno: $e'),
                ],
              ),
              backgroundColor: Colors.red,
              behavior: SnackBarBehavior.floating,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(10),
              ),
              duration: const Duration(seconds: 4),
            ),
          );
        }
      }
    }
  }
}