import 'dart:async';

import 'package:english_learning/core/widgets/custom_snackbar.dart';
import 'package:english_learning/features/auth/provider/user_provider.dart';
import 'package:english_learning/features/auth/provider/validator_provider.dart';
import 'package:english_learning/features/auth/screens/signin/signin_screen.dart';
import 'package:english_learning/core/widgets/form_field/custom_field_widget.dart';
import 'package:english_learning/core/widgets/global_button.dart';
import 'package:english_learning/core/utils/styles/theme.dart';
import 'package:english_learning/features/auth/widgets/dialog/signup_verification.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class SignupScreen extends StatefulWidget {
  SignupScreen({super.key});

  @override
  State<SignupScreen> createState() => _SignupScreenState();
}

class _SignupScreenState extends State<SignupScreen> {
  final TextEditingController _emailController = TextEditingController();

  final TextEditingController _passwordController = TextEditingController();

  final TextEditingController _nisnController = TextEditingController();

  final TextEditingController _nameController = TextEditingController();
  bool isLoading = false;

  @override
  Widget build(BuildContext context) {
    final userProvider = Provider.of<UserProvider>(context, listen: false);
    Provider.of<ValidatorProvider>(context, listen: false);

    final mediaQuery = MediaQuery.of(context);
    final screenHeight = mediaQuery.size.height;

    Future<void> handleRegistration(
      BuildContext context,
      ValidatorProvider validatorProvider,
    ) async {
      if (isLoading) return; // Prevent multiple submissions

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

      try {
        // Attempt registration with timeout
        final isSuccess = await userProvider
            .register(
          name: _nameController.text,
          email: _emailController.text,
          nisn: _nisnController.text,
          password: _passwordController.text,
          confirmPassword: _passwordController.text,
        )
            .timeout(
          const Duration(seconds: 30),
          onTimeout: () {
            throw TimeoutException(
                'Registration request timed out. Please try again.');
          },
        );

        // Remove loading dialog
        Navigator.of(context).pop();

        if (isSuccess) {
          // Show success verification dialog
          if (!context.mounted) return;
          await showDialog(
            context: context,
            barrierDismissible: false,
            builder: (BuildContext dialogContext) {
              return PopScope(
                canPop: false,
                child: SignupVerification(
                  onSubmit: () {
                    // Clear the form fields
                    _emailController.clear();
                    _passwordController.clear();
                    _nisnController.clear();
                    _nameController.clear();
                    validatorProvider.resetFields();

                    // Navigate to login screen
                    Navigator.of(dialogContext).pushAndRemoveUntil(
                      MaterialPageRoute(
                        builder: (context) => SigninScreen(),
                      ),
                      (Route<dynamic> route) => false,
                    );
                  },
                ),
              );
            },
          );
        } else {
          if (!context.mounted) return;
          CustomSnackBar.show(
            context,
            message: 'Registration failed. Please try again.',
            isError: true,
          );
        }
      } catch (e) {
        // Remove loading dialog if it's showing
        if (Navigator.canPop(context)) {
          Navigator.of(context).pop();
        }

        if (!context.mounted) return;
        CustomSnackBar.show(
          context,
          message: 'An error occurred: ${e.toString()}',
          isError: true,
        );
      } finally {
        setState(() {
          isLoading = false;
        });
      }
    }

    return Scaffold(
      backgroundColor: AppColors.whiteColor,
      body: Center(
        child: Container(
          margin: const EdgeInsets.symmetric(horizontal: 16),
          child: SingleChildScrollView(
            child: Consumer<ValidatorProvider>(
              builder: (context, validatorProvider, child) {
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    SizedBox(height: screenHeight * 0.05),
                    Text(
                      '👋 Hi!, you here!',
                      style: AppTextStyles.blueTextStyle.copyWith(
                        fontSize: 24,
                        fontWeight: FontWeight.w900,
                      ),
                    ),
                    const SizedBox(height: 4),
                    Text(
                      'Let\'s start by creating your account first',
                      style: AppTextStyles.greyTextStyle.copyWith(
                        fontSize: 14,
                        fontWeight: FontWeight.w400,
                      ),
                    ),
                    const SizedBox(height: 49),
                    CustomFieldWidget(
                      controller: _nisnController,
                      fieldName: 'nisn',
                      isRequired: true,
                      textInputAction: TextInputAction.next,
                      labelText: 'NISN',
                      hintText: 'Enter Your NISN',
                      keyboardType: TextInputType.number,
                      validator: validatorProvider.nisnValidator,
                      onChanged: (value) {
                        validatorProvider.validateField('nisn', value,
                            validator: validatorProvider.nisnValidator);
                      },
                      errorText: validatorProvider.getError('nisn'),
                    ),
                    const SizedBox(height: 14),
                    CustomFieldWidget(
                      controller: _nameController,
                      fieldName: 'name',
                      isRequired: true,
                      textInputAction: TextInputAction.next,
                      labelText: 'Full Name',
                      hintText: 'Enter Your Full Name',
                      keyboardType: TextInputType.text,
                      validator: validatorProvider.fullNameValidator,
                      onChanged: (value) {
                        validatorProvider.validateField(
                          'fullname',
                          value,
                          validator: validatorProvider.fullNameValidator,
                        );
                      },
                      errorText: validatorProvider.getError('name'),
                    ),
                    const SizedBox(height: 14),
                    CustomFieldWidget(
                      controller: _emailController,
                      fieldName: 'email',
                      isRequired: true,
                      textInputAction: TextInputAction.next,
                      labelText: 'Email Address',
                      hintText: 'Enter Your Email Address',
                      keyboardType: TextInputType.emailAddress,
                      validator: validatorProvider.emailValidator,
                      onChanged: (value) {
                        validatorProvider.validateField(
                          'email',
                          value,
                          validator: validatorProvider.emailValidator,
                        );
                      },
                      errorText: validatorProvider.getError('email'),
                    ),
                    const SizedBox(height: 14),
                    CustomFieldWidget(
                      controller: _passwordController,
                      fieldName: 'password',
                      isRequired: true,
                      textInputAction: TextInputAction.next,
                      labelText: 'Password',
                      hintText: 'Create a Strong Password',
                      obscureText: validatorProvider.isObscure('password'),
                      keyboardType: TextInputType.visiblePassword,
                      validator: validatorProvider.passwordValidator,
                      onChanged: (value) {
                        validatorProvider.validateField(
                          'password',
                          value,
                          validator: validatorProvider.passwordValidator,
                        );
                      },
                      onSuffixIconTap: () =>
                          validatorProvider.toggleVisibility('password'),
                      errorText: validatorProvider.getError('password'),
                    ),
                    const SizedBox(height: 14),
                    CustomFieldWidget(
                      fieldName: 'confirmPassword',
                      isRequired: true,
                      textInputAction: TextInputAction.next,
                      labelText: 'Confirm Password',
                      hintText: 'Retype Your Password',
                      obscureText:
                          validatorProvider.isObscure('confirmPassword'),
                      keyboardType: TextInputType.visiblePassword,
                      validator: validatorProvider.confirmPasswordValidator,
                      onChanged: (value) {
                        validatorProvider.validateField(
                          'confirmPassword',
                          value,
                          validator: validatorProvider.confirmPasswordValidator,
                        );
                      },
                      onSuffixIconTap: () =>
                          validatorProvider.toggleVisibility('confirmPassword'),
                      errorText: validatorProvider.getError('confirmPassword'),
                    ),
                    const SizedBox(height: 24),
                    GlobalButton(
                      text: 'Sign Up',
                      isLoading: isLoading,
                      onPressed: isLoading
                          ? null
                          : () {
                              validatorProvider.validateField(
                                  'nisn', _nisnController.text,
                                  validator: validatorProvider.nisnValidator);
                              validatorProvider.validateField(
                                  'name', _nameController.text,
                                  validator:
                                      validatorProvider.fullNameValidator);
                              validatorProvider.validateField(
                                  'email', _emailController.text,
                                  validator: validatorProvider.emailValidator);
                              validatorProvider.validateField(
                                  'password', _passwordController.text,
                                  validator:
                                      validatorProvider.passwordValidator);
                              validatorProvider.validateField(
                                  'confirmPassword', _passwordController.text,
                                  validator: validatorProvider
                                      .confirmPasswordValidator);

                              // If no error, proceed with registration
                              if (validatorProvider.getError('nisn') == null &&
                                  validatorProvider.getError('name') == null &&
                                  validatorProvider.getError('email') == null &&
                                  validatorProvider.getError('password') ==
                                      null &&
                                  validatorProvider
                                          .getError('confirmPassword') ==
                                      null) {
                                handleRegistration(context, validatorProvider);
                              }
                            },
                    ),
                    const SizedBox(height: 8),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Text(
                          'Already have an account?',
                          style: AppTextStyles.blackTextStyle
                              .copyWith(fontSize: 14),
                        ),
                        GestureDetector(
                          onTap: () {
                            context.read<ValidatorProvider>().resetFields();
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                  builder: (context) => SigninScreen()),
                            );
                          },
                          child: Text(
                            ' Login Here',
                            style: AppTextStyles.blueTextStyle.copyWith(
                              fontSize: 14,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ],
                );
              },
            ),
          ),
        ),
      ),
    );
  }
}