import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:ontime_merchant_flutter/core/fcm_service.dart';
import 'package:ontime_merchant_flutter/features/auth/application/auth_controller.dart';

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

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

class _LoginScreenState extends ConsumerState<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _phoneController = TextEditingController();
  final _passwordController = TextEditingController();

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

  Future<void> _submit() async {
    if (!_formKey.currentState!.validate()) return;
    final fcmToken = await FcmService.getToken();
    final auth = ref.read(authControllerProvider.notifier);
    await auth.login(
      noTelepon: _phoneController.text.trim(),
      password: _passwordController.text,
      fcmToken: fcmToken,
    );
    final state = ref.read(authControllerProvider);
    if (state.merchant != null && mounted) context.go('/home');
  }

  @override
  Widget build(BuildContext context) {
    final state = ref.watch(authControllerProvider);
    return Scaffold(
      appBar: AppBar(title: const Text('Masuk Merchant')),
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                TextFormField(
                  controller: _phoneController,
                  decoration: const InputDecoration(labelText: 'No. Telepon'),
                  keyboardType: TextInputType.phone,
                  validator: (v) =>
                      (v == null || v.isEmpty) ? 'No. telepon wajib diisi' : null,
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _passwordController,
                  decoration: const InputDecoration(labelText: 'Kata sandi'),
                  obscureText: true,
                  validator: (v) =>
                      (v == null || v.isEmpty) ? 'Password wajib diisi' : null,
                ),
                if (state.errorMessage != null) ...[
                  const SizedBox(height: 8),
                  Text(
                    state.errorMessage!,
                    style: TextStyle(color: Theme.of(context).colorScheme.error),
                  ),
                ],
                const Spacer(),
                ElevatedButton(
                  onPressed: state.isLoading ? null : _submit,
                  child: state.isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Masuk'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}