import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../providers/auth_provider.dart';

class SignUpScreen extends ConsumerStatefulWidget {
  const SignUpScreen({super.key});

  @override
  ConsumerState<SignUpScreen> createState() => _SignUpScreenState();
}

class _SignUpScreenState extends ConsumerState<SignUpScreen> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _confirmPasswordController = TextEditingController();
  final _organizationIdController = TextEditingController();
  bool _isLoading = false;
  bool _obscurePassword = true;
  bool _obscureConfirmPassword = true;

  @override
  void dispose() {
    _nameController.dispose();
    _emailController.dispose();
    _passwordController.dispose();
    _confirmPasswordController.dispose();
    _organizationIdController.dispose();
    super.dispose();
  }

  Future<void> _handleSignUp() async {
    if (!_formKey.currentState!.validate()) return;

    setState(() => _isLoading = true);

    try {
      final signUp = ref.read(signUpProvider);
      await signUp(
        email: _emailController.text.trim(),
        password: _passwordController.text,
        displayName: _nameController.text.trim(),
        organizationId: _organizationIdController.text.trim(),
      );
      
      if (mounted) {
        Navigator.pop(context);
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(e.toString()),
            backgroundColor: Colors.red,
          ),
        );
      }
    } finally {
      if (mounted) {
        setState(() => _isLoading = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Opprett konto'),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                // Navn
                TextFormField(
                  controller: _nameController,
                  decoration: const InputDecoration(
                    labelText: 'Fullt navn',
                    prefixIcon: Icon(Icons.person_outlined),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Vennligst skriv inn navn';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                
                // E-post
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(
                    labelText: 'E-post',
                    prefixIcon: Icon(Icons.email_outlined),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Vennligst skriv inn e-post';
                    }
                    if (!value.contains('@')) {
                      return 'Vennligst skriv inn en gyldig e-post';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                
                // Organisasjons-ID
                TextFormField(
                  controller: _organizationIdController,
                  decoration: const InputDecoration(
                    labelText: 'Organisasjons-ID',
                    prefixIcon: Icon(Icons.business_outlined),
                    helperText: 'Kontakt administrator for organisasjons-ID',
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Vennligst skriv inn organisasjons-ID';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                
                // Passord
                TextFormField(
                  controller: _passwordController,
                  obscureText: _obscurePassword,
                  decoration: InputDecoration(
                    labelText: 'Passord',
                    prefixIcon: const Icon(Icons.lock_outlined),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscurePassword
                            ? Icons.visibility_outlined
                            : Icons.visibility_off_outlined,
                      ),
                      onPressed: () {
                        setState(() {
                          _obscurePassword = !_obscurePassword;
                        });
                      },
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Vennligst skriv inn passord';
                    }
                    if (value.length < 6) {
                      return 'Passordet må være minst 6 tegn';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                
                // Bekreft passord
                TextFormField(
                  controller: _confirmPasswordController,
                  obscureText: _obscureConfirmPassword,
                  decoration: InputDecoration(
                    labelText: 'Bekreft passord',
                    prefixIcon: const Icon(Icons.lock_outlined),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscureConfirmPassword
                            ? Icons.visibility_outlined
                            : Icons.visibility_off_outlined,
                      ),
                      onPressed: () {
                        setState(() {
                          _obscureConfirmPassword = !_obscureConfirmPassword;
                        });
                      },
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Vennligst bekreft passord';
                    }
                    if (value != _passwordController.text) {
                      return 'Passordene matcher ikke';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 32),
                
                // Opprett konto knapp
                FilledButton(
                  onPressed: _isLoading ? null : _handleSignUp,
                  style: FilledButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 16),
                  ),
                  child: _isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Opprett konto'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}