/// Email/password sign-in against PocketBase.
library;

import 'package:flutter/material.dart';
import 'package:pocketbase/pocketbase.dart';
import 'package:provider/provider.dart';

import '../providers/auth_provider.dart';
import '../utils/constants.dart';
import '../widgets/app_text_field.dart';
import '../widgets/responsive_body.dart';

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

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

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

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

  Future<void> _submit() async {
    if (_busy) return;
    if (!(_formKey.currentState?.validate() ?? false)) return;

    setState(() => _busy = true);
    final auth = context.read<AuthController>();
    try {
      await auth.login(
        email: _emailController.text,
        password: _passwordController.text,
      );
      if (!mounted) return;
      Navigator.of(context).pop(true);
    } on ClientException catch (error) {
      if (!mounted) return;
      final message = error.response['message'] as String? ??
          'Sign-in failed. Check email and password.';
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(message)),
      );
    } catch (error) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Could not reach $kPocketBaseUrl')),
      );
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Scaffold(
      appBar: AppBar(title: const Text('Sign in')),
      body: ResponsiveBody(
        child: ListView(
          padding: const EdgeInsets.fromLTRB(16, 24, 16, 32),
          children: [
            Text(
              'Sync account',
              style: theme.textTheme.headlineSmall,
            ),
            const SizedBox(height: 8),
            Text(
              'Sign in to link this device with PocketBase. Your labels, '
              'notes, and bank cache stay on this phone until sync is added.',
              style: theme.textTheme.bodyMedium?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: 24),
            Form(
              key: _formKey,
              child: Column(
                children: [
                  AppTextField(
                    controller: _emailController,
                    label: 'Email',
                    keyboardType: TextInputType.emailAddress,
                    textInputAction: TextInputAction.next,
                    autofocus: true,
                    validator: (value) {
                      final text = value?.trim() ?? '';
                      if (text.isEmpty) return 'Enter your email';
                      if (!text.contains('@')) return 'Enter a valid email';
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _passwordController,
                    obscureText: _obscurePassword,
                    textInputAction: TextInputAction.done,
                    onFieldSubmitted: (_) => _submit(),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'Enter your password';
                      }
                      return null;
                    },
                    decoration: InputDecoration(
                      labelText: 'Password',
                      suffixIcon: IconButton(
                        tooltip: _obscurePassword
                            ? 'Show password'
                            : 'Hide password',
                        onPressed: () => setState(
                          () => _obscurePassword = !_obscurePassword,
                        ),
                        icon: Icon(
                          _obscurePassword
                              ? Icons.visibility_outlined
                              : Icons.visibility_off_outlined,
                        ),
                      ),
                    ),
                  ),
                  const SizedBox(height: 24),
                  FilledButton.icon(
                    onPressed: _busy ? null : _submit,
                    icon: _busy
                        ? SizedBox(
                            width: 18,
                            height: 18,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                              color: theme.colorScheme.onPrimary,
                            ),
                          )
                        : const Icon(Icons.login),
                    label: Text(_busy ? 'Signing in…' : 'Sign in'),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}