import 'package:flutter/material.dart';
import '../api_service.dart';
import '../settings.dart';
import '../theme.dart';
import 'home_screen.dart';
import 'settings_screen.dart';

class LoginScreen extends StatefulWidget {
  final ApiService api;
  final Settings settings;
  const LoginScreen({super.key, required this.api, required this.settings});

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

class _LoginScreenState extends State<LoginScreen> {
  final _email = TextEditingController();
  final _pin = TextEditingController();
  bool _busy = false;
  String? _error;

  Future<void> _login() async {
    if (_email.text.trim().isEmpty || _pin.text.isEmpty) {
      setState(() => _error = 'Enter your work email and PIN');
      return;
    }
    setState(() { _busy = true; _error = null; });
    try {
      await widget.api.login(_email.text, _pin.text);
      if (!mounted) return;
      Navigator.pushReplacement(context,
          MaterialPageRoute(builder: (_) => HomeScreen(api: widget.api, settings: widget.settings)));
    } on ApiException catch (e) {
      setState(() => _error = e.message);
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(24),
            child: ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 420),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
                    Row(children: [
                      Container(
                        width: 40, height: 40,
                        decoration: BoxDecoration(color: AppColors.emerald, borderRadius: BorderRadius.circular(12)),
                        child: const Icon(Icons.badge_outlined, color: Colors.white),
                      ),
                      const SizedBox(width: 10),
                      const Text('Scalar360', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: AppColors.navy)),
                    ]),
                    IconButton(
                      icon: const Icon(Icons.settings_outlined, color: AppColors.muted),
                      onPressed: () => Navigator.push(context,
                          MaterialPageRoute(builder: (_) => SettingsScreen(settings: widget.settings))),
                    ),
                  ]),
                  const SizedBox(height: 28),
                  const Text('Employee sign in',
                      style: TextStyle(fontSize: 26, fontWeight: FontWeight.bold, color: AppColors.navy)),
                  const SizedBox(height: 4),
                  const Text('Use your work email and the PIN from HR', style: TextStyle(color: AppColors.muted)),
                  const SizedBox(height: 24),
                  TextField(
                    controller: _email,
                    keyboardType: TextInputType.emailAddress,
                    autocorrect: false,
                    decoration: const InputDecoration(labelText: 'Work email', prefixIcon: Icon(Icons.mail_outline)),
                  ),
                  const SizedBox(height: 14),
                  TextField(
                    controller: _pin,
                    obscureText: true,
                    keyboardType: TextInputType.number,
                    onSubmitted: (_) => _login(),
                    decoration: const InputDecoration(labelText: 'PIN', prefixIcon: Icon(Icons.pin_outlined)),
                  ),
                  if (_error != null) ...[
                    const SizedBox(height: 14),
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(color: AppColors.danger.withValues(alpha: 0.08), borderRadius: BorderRadius.circular(12)),
                      child: Row(children: [
                        const Icon(Icons.error_outline, color: AppColors.danger, size: 18),
                        const SizedBox(width: 8),
                        Expanded(child: Text(_error!, style: const TextStyle(color: AppColors.danger))),
                      ]),
                    ),
                  ],
                  const SizedBox(height: 22),
                  FilledButton(
                    onPressed: _busy ? null : _login,
                    child: _busy
                        ? const SizedBox(height: 22, width: 22, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
                        : const Text('Sign in'),
                  ),
                  const SizedBox(height: 16),
                  Text('Server: ${widget.settings.baseUrl}',
                      textAlign: TextAlign.center, style: const TextStyle(color: AppColors.muted, fontSize: 12)),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}