import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:intl/intl.dart';
import 'package:medora/data/models/consultation_center.dart';
import 'package:medora/data/models/doctor.dart';
import 'package:medora/data/models/patient.dart';
import 'package:medora/data/services/consultation_booking_service.dart';
import 'package:medora/data/services/patient_registration_service.dart';
import 'package:medora/route/route_names.dart';
import 'package:medora/widgets/alert_screen.dart';

class ConsultationBookingScreen extends StatefulWidget {
  final Doctor doctor;
  final ConsultationCenter selectedConsultation;
  final DateTime selectedDate;
  final String selectedTime;

  const ConsultationBookingScreen({
    super.key,
    required this.doctor,
    required this.selectedConsultation,
    required this.selectedDate,
    required this.selectedTime,
  });

  @override
  State<ConsultationBookingScreen> createState() =>
      _ConsultationBookingScreenState();
}

class _ConsultationBookingScreenState extends State<ConsultationBookingScreen> {
  PatientModel? selectedPatient;
  List<PatientModel> familyMembers = [];
  FamilyMember? selectedFamilyMember;
  bool isLoading = true;
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _relationController = TextEditingController();
  DateTime? _selectedDateOfBirth;
  String _selectedGender = 'Male';

  @override
  void dispose() {
    _nameController.dispose();
    _relationController.dispose();
    super.dispose();
  }

  @override
  void initState() {
    super.initState();
    _loadPatientProfile();
  }

  Future<void> _loadPatientProfile() async {
    setState(() => isLoading = true);
    try {
      final currentPatient = await PatientProfileService.getPatientProfile();
      if (currentPatient != null) {
        setState(() {
          selectedPatient = currentPatient;
        });
      }
    } catch (e) {
      print('Error loading patient data: $e');
    } finally {
      setState(() => isLoading = false);
    }
  }

  String get formattedAddress {
    final parts = [
      widget.selectedConsultation.floorBuilding,
      widget.selectedConsultation.street,
      widget.selectedConsultation.city,
      widget.selectedConsultation.state,
      widget.selectedConsultation.postalCode
    ].where((part) => part != null && part.isNotEmpty).toList();
    return parts.join(', ');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFF5F7FF),
      appBar: _buildAppBar(context),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              _buildAppointmentCard(),
              const SizedBox(height: 24),
              _buildDoctorDetails(),
              const SizedBox(height: 24),
              _buildLocationDetails(),
              const SizedBox(height: 24),
              _buildPaymentDetails(),
              const SizedBox(height: 24),
              _buildInClinicAppointmentText(),
              const SizedBox(height: 24),
              _buildConfirmButton(context),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildInClinicAppointmentText() {
    String patientName =
        selectedFamilyMember?.name ?? selectedPatient?.name ?? 'Select Patient';
    String relation = selectedFamilyMember?.relation != null
        ? ' (${selectedFamilyMember!.relation})'
        : '';

    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Expanded(
            child: RichText(
              text: TextSpan(
                style: GoogleFonts.poppins(
                  fontSize: 16,
                  color: Colors.black87,
                ),
                children: [
                  const TextSpan(text: 'In-clinic appointment for '),
                  TextSpan(
                    text: '$patientName$relation',
                    style: const TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ],
              ),
            ),
          ),
          TextButton(
            onPressed: _showPatientSelectionDialog,
            child: Text(
              'Change',
              style: GoogleFonts.poppins(
                color: Colors.blue,
                fontWeight: FontWeight.w500,
              ),
            ),
          ),
        ],
      ),
    );
  }

  PreferredSizeWidget _buildAppBar(BuildContext context) {
    return AppBar(
      backgroundColor: Colors.white,
      elevation: 0,
      leading: IconButton(
        icon: const Icon(Icons.arrow_back, color: Colors.black87),
        onPressed: () => Navigator.pop(context),
      ),
      title: Text(
        'Booking Overview',
        style: GoogleFonts.poppins(
          color: Colors.black87,
          fontWeight: FontWeight.w600,
          fontSize: 20,
        ),
      ),
      centerTitle: true,
    );
  }

  Widget _buildAppointmentCard() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.blue,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.blue.withOpacity(0.3),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        children: [
          Row(
            children: [
              const Icon(Icons.calendar_today, color: Colors.white),
              const SizedBox(width: 12),
              Text(
                DateFormat('EEEE, MMMM d').format(widget.selectedDate),
                style: GoogleFonts.poppins(
                  color: Colors.white,
                  fontSize: 16,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),
          const SizedBox(height: 12),
          Row(
            children: [
              const Icon(Icons.access_time, color: Colors.white),
              const SizedBox(width: 12),
              Text(
                widget.selectedTime,
                style: GoogleFonts.poppins(
                  color: Colors.white,
                  fontSize: 16,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildDoctorDetails() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        children: [
          ClipRRect(
            borderRadius: BorderRadius.circular(12),
            child: Image.network(
              widget.doctor.profileImage!,
              width: 80,
              height: 80,
              fit: BoxFit.cover,
              errorBuilder: (context, error, stackTrace) {
                return Container(
                  width: 80,
                  height: 80,
                  color: Colors.grey[300],
                  child: Icon(Icons.person, size: 40, color: Colors.grey[600]),
                );
              },
            ),
          ),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  widget.doctor.firstName ?? '',
                  style: GoogleFonts.poppins(
                    fontSize: 18,
                    fontWeight: FontWeight.w600,
                  ),
                ),
                Text(
                  widget.doctor.speciality!,
                  style: GoogleFonts.poppins(
                    fontSize: 14,
                    color: Colors.grey[600],
                  ),
                ),
                Text(
                  '${widget.doctor.yearsOfExperience} years experience',
                  style: GoogleFonts.poppins(
                    fontSize: 14,
                    color: Colors.grey[600],
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildLocationDetails() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Location',
            style: GoogleFonts.poppins(
              fontSize: 16,
              fontWeight: FontWeight.w600,
            ),
          ),
          const SizedBox(height: 8),
          Text(
            formattedAddress,
            style: GoogleFonts.poppins(
              fontSize: 14,
              color: Colors.grey[600],
            ),
          ),
          const SizedBox(height: 8),
          Text(
            'Average consultation time: ${widget.selectedConsultation.averageDurationMinutes} minutes',
            style: GoogleFonts.poppins(
              fontSize: 14,
              color: Colors.grey[600],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildPaymentDetails() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Payment Details',
            style: GoogleFonts.poppins(
              fontSize: 16,
              fontWeight: FontWeight.w600,
            ),
          ),
          const SizedBox(height: 16),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'Consultation Fee',
                style: GoogleFonts.poppins(
                  fontSize: 14,
                  color: Colors.grey[600],
                ),
              ),
              Text(
                '₹${widget.selectedConsultation.consultationFee ?? "500"}',
                style: GoogleFonts.poppins(
                  fontSize: 14,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildConfirmButton(BuildContext context) {
    return SizedBox(
      width: double.infinity,
      child: ElevatedButton(
        onPressed: () {
          // Handle payment and booking confirmation
          _showConfirmationDialog(context);
        },
        style: ElevatedButton.styleFrom(
          backgroundColor: Colors.blue,
          padding: const EdgeInsets.symmetric(vertical: 16),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
        ),
        child: Text(
          'Confirm & Pay',
          style: GoogleFonts.poppins(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            color: Colors.white,
          ),
        ),
      ),
    );
  }

  void _showConfirmationDialog(BuildContext context) async {
    if (selectedPatient == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('Please select a patient for the appointment'),
          backgroundColor: Colors.red,
        ),
      );
      return;
    }

    final bookingService = BookingService();
    final currentUser = FirebaseAuth.instance.currentUser;

    // Get the correct patient name based on selection
    final patientName = selectedFamilyMember != null
        ? selectedFamilyMember!.name
        : selectedPatient!.name;

    try {
      if (context.mounted) {
        showDialog(
          context: context,
          barrierDismissible: false,
          builder: (context) => const Center(
            child: CircularProgressIndicator(),
          ),
        );
      }

      final bookingId = await bookingService.createBooking(
        doctorName: widget.doctor.firstName ?? 'Doctor',
        patientId: currentUser!.uid,
        patientName: patientName ?? 'Patient',
        location: formattedAddress,
        appointmentDate: widget.selectedDate,
        appointmentTime: widget.selectedTime,
        consultationFee:
            int.parse(widget.selectedConsultation.consultationFee ?? "500"),
        specialization: widget.doctor.speciality!,
      );

      if (context.mounted) {
        Navigator.pop(context);
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => AlertScreen(
              arguments: AlertArguments(
                title: 'Booking Confirmed',
                message:
                    'Your in-clinic appointment has been successfully booked for $patientName. Booking ID: ${bookingId.substring(0, 8)}\n\nPlease complete the payment to confirm your appointment.',
                actionTitle: 'View Appointments',
                type: AlertType.success,
                onActionPressed: () {
                  Navigator.pushReplacementNamed(
                      context, RouteNames.patientDashboardScreen);
                },
              ),
            ),
          ),
        );
      }
    } catch (e) {
      if (context.mounted) {
        Navigator.pop(context);
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => AlertScreen(
              arguments: AlertArguments(
                title: 'Booking Failed',
                message: 'Unable to create booking. ${e.toString()}',
                actionTitle: 'Try Again',
                type: AlertType.error,
                onActionPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ),
          ),
        );
      }
    }
  }

  Future<void> _showAddFamilyMemberDialog() async {
    _nameController.clear();
    _relationController.clear();
    setState(() {
      _selectedDateOfBirth = null;
      _selectedGender = 'Male';
    });

    return showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext dialogContext) => StatefulBuilder(
        builder: (BuildContext context, StateSetter setDialogState) {
          return AlertDialog(
            shape:
                RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
            title: Text(
              'Add Family Member',
              style: GoogleFonts.poppins(fontWeight: FontWeight.w600),
            ),
            content: AnimatedContainer(
              duration: const Duration(milliseconds: 300),
              child: SingleChildScrollView(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    TextFormField(
                      controller: _nameController,
                      decoration: InputDecoration(
                        labelText: 'Full Name',
                        labelStyle: GoogleFonts.poppins(),
                        border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(12),
                        ),
                        prefixIcon: const Icon(
                          Icons.person_outline,
                          color: Colors.blue,
                        ),
                      ),
                    ),
                    const SizedBox(height: 16),
                    TextFormField(
                      controller: _relationController,
                      decoration: InputDecoration(
                        labelText: 'Relation',
                        labelStyle: GoogleFonts.poppins(),
                        border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(12),
                        ),
                        prefixIcon: const Icon(
                          Icons.family_restroom,
                          color: Colors.blue,
                        ),
                      ),
                    ),
                    const SizedBox(height: 16),
                    InkWell(
                      onTap: () async {
                        final DateTime? picked = await showDatePicker(
                          context: context,
                          initialDate: DateTime.now(),
                          firstDate: DateTime(1900),
                          lastDate: DateTime.now(),
                          builder: (context, child) {
                            return Theme(
                              data: Theme.of(context).copyWith(
                                colorScheme: ColorScheme.light(
                                  primary: Colors.blue,
                                  onPrimary: Colors.white,
                                  surface: Colors.grey[100]!,
                                ),
                              ),
                              child: child!,
                            );
                          },
                        );
                        if (picked != null) {
                          setDialogState(() {
                            _selectedDateOfBirth = picked;
                          });
                        }
                      },
                      child: Container(
                        padding: const EdgeInsets.all(16),
                        decoration: BoxDecoration(
                          border: Border.all(color: Colors.grey[300]!),
                          borderRadius: BorderRadius.circular(12),
                        ),
                        child: Row(
                          children: [
                            const Icon(Icons.calendar_today,
                                color: Colors.blue),
                            const SizedBox(width: 12),
                            Text(
                              _selectedDateOfBirth != null
                                  ? DateFormat('dd/MM/yyyy')
                                      .format(_selectedDateOfBirth!)
                                  : 'Select Date of Birth',
                              style: GoogleFonts.poppins(),
                            ),
                          ],
                        ),
                      ),
                    ),
                    const SizedBox(height: 16),
                    Container(
                      padding: const EdgeInsets.symmetric(horizontal: 12),
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey[300]!),
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: DropdownButtonHideUnderline(
                        child: DropdownButtonFormField<String>(
                          value: _selectedGender,
                          decoration: InputDecoration(
                            prefixIcon: const Icon(Icons.person_outline,
                                color: Colors.blue),
                            border: InputBorder.none,
                            labelStyle: GoogleFonts.poppins(),
                          ),
                          items: ['Male', 'Female', 'Other']
                              .map((gender) => DropdownMenuItem(
                                    value: gender,
                                    child: Text(gender,
                                        style: GoogleFonts.poppins()),
                                  ))
                              .toList(),
                          onChanged: (value) {
                            if (value != null) {
                              setDialogState(() => _selectedGender = value);
                            }
                          },
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context),
                child: Text(
                  'Cancel',
                  style: GoogleFonts.poppins(color: Colors.grey),
                ),
              ),
              ElevatedButton(
                onPressed: () => _addFamilyMember(context),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Colors.blue,
                  padding:
                      const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                ),
                child: Text(
                  'Add Member',
                  style: GoogleFonts.poppins(color: Colors.white),
                ),
              ),
            ],
          );
        },
      ),
    );
  }

  Future<void> _addFamilyMember(BuildContext context) async {
    if (_nameController.text.isEmpty ||
        _relationController.text.isEmpty ||
        _selectedDateOfBirth == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            'Please fill in all fields',
            style: GoogleFonts.poppins(),
          ),
          backgroundColor: Colors.red,
          behavior: SnackBarBehavior.floating,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(10),
          ),
        ),
      );
      return;
    }

    try {
      final newFamilyMember = FamilyMember(
        name: _nameController.text,
        relation: _relationController.text,
        gender: _selectedGender,
        dateOfBirth: _selectedDateOfBirth,
      );

      if (selectedPatient != null) {
        selectedPatient!.familyMembers.add(newFamilyMember);
        await PatientProfileService.updatePatientProfile(selectedPatient!);

        setState(() {
          selectedFamilyMember = newFamilyMember;
        });
      }

      if (context.mounted) {
        Navigator.pop(context);

        _showPatientSelectionDialog();
      }
    } catch (e) {
      if (context.mounted) {
        Navigator.pop(context); // Pop add family member dialog
      }
    }
  }

  void _showPatientSelectionDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
        title: Text(
          'Select Patient',
          style: GoogleFonts.poppins(fontWeight: FontWeight.w600),
        ),
        content: SizedBox(
          width: double.maxFinite,
          child: ListView(
            shrinkWrap: true,
            children: [
              // Main patient
              _buildPatientTile(
                name: selectedPatient?.name ?? '',
                subtitle: 'Primary Patient',
                isSelected: selectedFamilyMember == null,
                onTap: () {
                  setState(() {
                    selectedFamilyMember = null;
                  });
                  Navigator.pop(context);
                },
              ),
              const Divider(),
              // Family members
              ...selectedPatient?.familyMembers.map(
                    (member) => _buildPatientTile(
                      name: member.name ?? '',
                      subtitle: member.relation ?? '',
                      isSelected: selectedFamilyMember == member,
                      onTap: () {
                        setState(() {
                          selectedFamilyMember = member;
                        });
                        Navigator.pop(context);
                      },
                    ),
                  ) ??
                  [],
              const Divider(),
              ListTile(
                leading: Container(
                  padding: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.blue.withOpacity(0.1),
                    shape: BoxShape.circle,
                  ),
                  child: const Icon(Icons.person_add, color: Colors.blue),
                ),
                title: Text(
                  'Add Family Member',
                  style: GoogleFonts.poppins(
                    color: Colors.blue,
                    fontWeight: FontWeight.w500,
                  ),
                ),
                onTap: () {
                  Navigator.pop(context);
                  _showAddFamilyMemberDialog();
                },
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildPatientTile({
    required String name,
    required String subtitle,
    required bool isSelected,
    required VoidCallback onTap,
  }) {
    return ListTile(
      leading: Container(
        padding: const EdgeInsets.all(8),
        decoration: BoxDecoration(
          color: isSelected
              ? Colors.blue.withOpacity(0.1)
              : Colors.grey.withOpacity(0.1),
          shape: BoxShape.circle,
        ),
        child: Icon(
          Icons.person,
          color: isSelected ? Colors.blue : Colors.grey,
        ),
      ),
      title: Text(
        name,
        style: GoogleFonts.poppins(
          fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
          color: isSelected ? Colors.blue : Colors.black87,
        ),
      ),
      subtitle: Text(
        subtitle,
        style: GoogleFonts.poppins(
          color: Colors.grey[600],
        ),
      ),
      trailing: isSelected
          ? const Icon(Icons.check_circle, color: Colors.blue)
          : null,
      onTap: onTap,
    );
  }
}