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

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

  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _serverController = TextEditingController();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _obscurePassword = true;

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

  Future<void> _loadSavedServer() async {
    const storage = FlutterSecureStorage();
    final saved = await storage.read(key: 'server_url');
    if (saved != null && mounted) {
      _serverController.text = saved;
    }
  }

  void _submit() {
    if (!_formKey.currentState!.validate()) return;

    var serverUrl = _serverController.text.trim();
    if (!serverUrl.startsWith('http')) {
      serverUrl = 'https://$serverUrl';
    }

    context.read<AuthProvider>().login(
          serverUrl,
          _usernameController.text.trim(),
          _passwordController.text,
        );
  }

  @override
  Widget build(BuildContext context) {
    final auth = context.watch<AuthProvider>();

    return Scaffold(
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(24),
            child: Form(
              key: _formKey,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(
                    Icons.phone_in_talk,
                    size: 64,
                    color: Theme.of(context).colorScheme.primary,
                  ),
                  const SizedBox(height: 16),
                  Text(
                    'TWP Softphone',
                    style: Theme.of(context).textTheme.headlineMedium,
                  ),
                  const SizedBox(height: 32),
                  TextFormField(
                    controller: _serverController,
                    decoration: const InputDecoration(
                      labelText: 'Server URL',
                      hintText: 'https://your-site.com',
                      prefixIcon: Icon(Icons.dns),
                      border: OutlineInputBorder(),
                    ),
                    keyboardType: TextInputType.url,
                    validator: (v) =>
                        v == null || v.trim().isEmpty ? 'Required' : null,
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _usernameController,
                    decoration: const InputDecoration(
                      labelText: 'Username',
                      prefixIcon: Icon(Icons.person),
                      border: OutlineInputBorder(),
                    ),
                    validator: (v) =>
                        v == null || v.trim().isEmpty ? 'Required' : null,
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _passwordController,
                    decoration: InputDecoration(
                      labelText: 'Password',
                      prefixIcon: const Icon(Icons.lock),
                      border: const OutlineInputBorder(),
                      suffixIcon: IconButton(
                        icon: Icon(_obscurePassword
                            ? Icons.visibility_off
                            : Icons.visibility),
                        onPressed: () =>
                            setState(() => _obscurePassword = !_obscurePassword),
                      ),
                    ),
                    obscureText: _obscurePassword,
                    validator: (v) =>
                        v == null || v.isEmpty ? 'Required' : null,
                  ),
                  if (auth.error != null) ...[
                    const SizedBox(height: 16),
                    Text(
                      auth.error!,
                      style: TextStyle(
                          color: Theme.of(context).colorScheme.error),
                    ),
                  ],
                  const SizedBox(height: 24),
                  SizedBox(
                    width: double.infinity,
                    height: 48,
                    child: FilledButton(
                      onPressed: auth.state == AuthState.authenticating
                          ? null
                          : _submit,
                      child: auth.state == AuthState.authenticating
                          ? const SizedBox(
                              width: 24,
                              height: 24,
                              child: CircularProgressIndicator(
                                  strokeWidth: 2, color: Colors.white),
                            )
                          : const Text('Connect'),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  @override
  void dispose() {
    _serverController.dispose();
    _usernameController.dispose();
    _passwordController.dispose();
    super.dispose();
  }
}