import 'dart:convert';
import 'package:blind_master/BlindMasterResources/error_snackbar.dart';
import 'package:blind_master/BlindMasterResources/secure_transmissions.dart';
import 'package:blind_master/BlindMasterScreens/accountManagement/change_password_screen.dart';
import 'package:blind_master/BlindMasterScreens/accountManagement/verify_email_change_screen.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';

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

  @override
  State<AccountScreen> createState() => _AccountScreenState();
}

class _AccountScreenState extends State<AccountScreen> {
  String? name;
  String? email;
  String? createdAt;
  bool isLoading = true;

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

  Future<void> fetchAccountInfo() async {
    try {
      final response = await secureGet('account_info');
      
      if (response == null) {
        throw Exception('No response from server');
      }

      if (response.statusCode == 200) {
        final body = json.decode(response.body);
        setState(() {
          name = body['name'] ?? 'N/A';
          email = body['email'] ?? 'N/A';
          
          // Parse and format the created_at timestamp
          if (body['created_at'] != null) {
            try {
              final DateTime dateTime = DateTime.parse(body['created_at']);
              final months = ['January', 'February', 'March', 'April', 'May', 'June',
                             'July', 'August', 'September', 'October', 'November', 'December'];
              createdAt = '${months[dateTime.month - 1]} ${dateTime.day}, ${dateTime.year}';
            } catch (e) {
              createdAt = 'N/A';
            }
          } else {
            createdAt = 'N/A';
          }
          
          isLoading = false;
        });
      } else {
        throw Exception('Failed to load account info');
      }
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(errorSnackbar(e));
      setState(() {
        isLoading = false;
      });
    }
  }

  Future<void> _handleChangeEmail() async {
    final TextEditingController emailController = TextEditingController();
    final formKey = GlobalKey<FormState>();
    final primaryColor = Theme.of(context).primaryColorLight;

    final result = await showDialog<bool>(
      context: context,
      builder: (BuildContext dialogContext) {
        return AlertDialog(
          title: Text('Change Email'),
          content: Form(
            key: formKey,
            child: TextFormField(
              controller: emailController,
              decoration: InputDecoration(
                labelText: 'New Email Address',
                border: OutlineInputBorder(),
                prefixIcon: Icon(Icons.email),
              ),
              keyboardType: TextInputType.emailAddress,
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter an email address';
                }
                final emailRegex = RegExp(r'^[^\s@]+@[^\s@]+\.[^\s@]+$');
                if (!emailRegex.hasMatch(value)) {
                  return 'Please enter a valid email';
                }
                if (value == email) {
                  return 'This is your current email';
                }
                return null;
              },
            ),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(false),
              child: Text('Cancel'),
            ),
            ElevatedButton(
              style: ElevatedButton.styleFrom(
                backgroundColor: primaryColor,
                foregroundColor: Colors.white,
              ),
              onPressed: () async {
                if (formKey.currentState!.validate()) {
                  Navigator.of(dialogContext).pop(true);
                }
              },
              child: Text('Send Verification'),
            ),
          ],
        );
      },
    );

    // Allow dialog to fully close before disposing controller
    await Future.delayed(Duration(milliseconds: 100));
    
    if (result == true && mounted) {
      final newEmail = emailController.text.trim();
      
      try {
        // Show loading indicator
        showDialog(
          context: context,
          barrierDismissible: false,
          builder: (BuildContext loadingContext) {
            return Center(
              child: CircularProgressIndicator(
                color: primaryColor,
              ),
            );
          },
        );

        final localHour = DateTime.now().hour;
        final response = await securePost(
          {
            'newEmail': newEmail,
            'localHour': localHour,
          },
          'request-email-change',
        );

        // Remove loading indicator
        if (mounted) Navigator.of(context).pop();

        if (response == null) {
          throw Exception('No response from server');
        }

        if (response.statusCode == 200) {
          if (!mounted) return;
          
          // Navigate to waiting screen
          final success = await Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => EmailChangeWaitingScreen(newEmail: newEmail),
            ),
          );

          // If email was changed successfully, refresh account info
          if (success == true && mounted) {
            await fetchAccountInfo();
          }
        } else {
          final body = json.decode(response.body);
          throw Exception(body['error'] ?? 'Failed to send verification email');
        }
      } catch (e) {
        // Remove loading indicator if still showing
        if (mounted && Navigator.of(context).canPop()) {
          Navigator.of(context).pop();
        }

        if (!mounted) return;
        ScaffoldMessenger.of(context).showSnackBar(errorSnackbar(e));
      } finally {
        emailController.dispose();
      }
    } else {
      emailController.dispose();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).primaryColorLight,
        foregroundColor: Colors.white,
        title: Text(
          'Account',
          style: GoogleFonts.aBeeZee(),
        ),
      ),
      body: isLoading
          ? Center(
              child: CircularProgressIndicator(
                color: Theme.of(context).primaryColorLight,
              ),
            )
          : SingleChildScrollView(
              child: Padding(
                padding: const EdgeInsets.all(20.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    // Account Info Section
                    Card(
                      elevation: 2,
                      child: Padding(
                        padding: const EdgeInsets.all(20.0),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Center(
                              child: CircleAvatar(
                                radius: 50,
                                backgroundColor: Theme.of(context).primaryColorLight,
                                child: Icon(
                                  Icons.person,
                                  size: 60,
                                  color: Colors.white,
                                ),
                              ),
                            ),
                            SizedBox(height: 20),
                            _buildInfoRow('Name', name ?? 'N/A'),
                            Divider(height: 30),
                            _buildInfoRow('Email', email ?? 'N/A'),
                            Divider(height: 30),
                            _buildInfoRow('Member Since', createdAt ?? 'N/A'),
                          ],
                        ),
                      ),
                    ),
                    SizedBox(height: 30),
                    
                    // Account Options Section
                    Text(
                      'Account Options',
                      style: GoogleFonts.aBeeZee(
                        fontSize: 20,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    SizedBox(height: 15),
                    Card(
                      elevation: 2,
                      child: Column(
                        children: [
                          ListTile(
                            leading: Icon(Icons.email_outlined),
                            title: Text('Change Email'),
                            trailing: Icon(Icons.arrow_forward_ios, size: 16),
                            onTap: _handleChangeEmail,
                          ),
                          Divider(height: 1),
                          ListTile(
                            leading: Icon(Icons.lock_outline),
                            title: Text('Change Password'),
                            trailing: Icon(Icons.arrow_forward_ios, size: 16),
                            onTap: () {
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context) => ChangePasswordScreen(),
                                ),
                              );
                            },
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
              ),
            ),
    );
  }

  Widget _buildInfoRow(String label, String value) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: TextStyle(
            fontSize: 14,
            color: Colors.grey[600],
            fontWeight: FontWeight.w500,
          ),
        ),
        SizedBox(height: 5),
        Text(
          value,
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.w600,
          ),
        ),
      ],
    );
  }
}