import 'package:flutter/material.dart';

import '../api/odoo_client.dart';
import '../services/session.dart';
import 'home_screen.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const SaatInvestApp());
}

class SaatInvestApp extends StatelessWidget {
  const SaatInvestApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Saat Invest',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(colorSchemeSeed: const Color(0xFF0B6E4F), useMaterial3: true),
      home: const RootScreen(),
    );
  }
}

/// Jika session tersimpan -> Home, jika tidak -> Login.
class RootScreen extends StatefulWidget {
  const RootScreen({super.key});

  @override
  State<RootScreen> createState() => _RootScreenState();
}

class _RootScreenState extends State<RootScreen> {
  late Future<({String base, String db, String user, String pass})?> _check;

  @override
  void initState() {
    super.initState();
    _check = Session.load();
  }

  void _onLoginDone({required String base, required String db, required String user, required String pass}) {
    setState(() {
      _check = Future.value(
        (base: base, db: db, user: user, pass: pass),
      );
    });
  }

  Future<void> _logout() async {
    await Session.clear();
    setState(() => _check = Session.load());
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: _check,
      builder: (context, snap) {
        if (snap.connectionState != ConnectionState.done) {
          return const Scaffold(body: Center(child: CircularProgressIndicator()));
        }
        final s = snap.data;
        if (s == null) {
          return LoginScreen(onSuccess: _onLoginDone);
        }
        return HomeScreen(
          baseUrl: s.base,
          db: s.db,
          user: s.user,
          pass: s.pass,
          onLogout: _logout,
        );
      },
    );
  }
}

// ---------------------------------------------------------------------------

class LoginScreen extends StatefulWidget {
  const LoginScreen({super.key, required this.onSuccess});

  final void Function({required String base, required String db, required String user, required String pass}) onSuccess;

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

class _LoginScreenState extends State<LoginScreen> {
  final _url = TextEditingController(); // mis http://<IP>:18069
  final _db = TextEditingController(text: 'odoo');
  final _user = TextEditingController(text: 'admin');
  final _pass = TextEditingController();
  bool _busy = false;
  String? _error;

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

  Future<void> _loadUrl() async {
    final url = await Session.readLastUrl();
    if (url != null && mounted) {
      setState(() => _url.text = url);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFF0B6E4F),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Card(
            elevation: 4,
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
            child: Padding(
              padding: const EdgeInsets.all(20),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  const Icon(Icons.trending_up, color: Color(0xFF0B6E4F), size: 40),
                  const SizedBox(height: 8),
                  Text('Saat Invest', textAlign: TextAlign.center,
                      style: Theme.of(context).textTheme.headlineSmall),
                  Text('Catat Jual-Beli Saham via Odoo',
                      textAlign: TextAlign.center,
                      style: Theme.of(context).textTheme.bodySmall),
                  const SizedBox(height: 20),
                  TextField(controller: _url,
                      decoration: const InputDecoration(labelText: 'URL Server Odoo',
                          hintText: 'http://169.58.149.164:18069',
                          prefixIcon: Icon(Icons.dns))),
                  const SizedBox(height: 12),
                  TextField(controller: _db,
                      decoration: const InputDecoration(labelText: 'Database', prefixIcon: Icon(Icons.storage))),
                  const SizedBox(height: 12),
                  TextField(controller: _user,
                      decoration: const InputDecoration(labelText: 'Username', prefixIcon: Icon(Icons.person))),
                  const SizedBox(height: 12),
                  TextField(controller: _pass, obscureText: true,
                      decoration: const InputDecoration(labelText: 'Password', prefixIcon: Icon(Icons.lock))),
                  if (_error != null) ...[
                    const SizedBox(height: 12),
                    Text(_error!, style: const TextStyle(color: Colors.red)),
                  ],
                  const SizedBox(height: 20),
                  FilledButton.icon(
                    onPressed: _busy ? null : _login,
                    icon: _busy
                        ? const SizedBox(width: 18, height: 18,
                            child: CircularProgressIndicator(strokeWidth: 2))
                        : const Icon(Icons.login),
                    label: const Text('Masuk'),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _login() async {
    setState(() { _busy = true; _error = null; });
    String base = _url.text.trim();
    if (base.isNotEmpty && !base.startsWith('http')) base = 'http://$base';
    try {
      final c = OdooClient(
        baseUrl: base, db: _db.text.trim(), username: _user.text.trim(),
        password: _pass.text,
      );
      await c.authenticate(); // hit; lempar bila gagal
      await Session.save(base, _db.text.trim(), _user.text.trim(), _pass.text);
      if (!mounted) return;
      widget.onSuccess(base: base, db: _db.text.trim(), user: _user.text.trim(), pass: _pass.text);
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _busy = false;
        _error = e.toString().replaceFirst('Exception: ', '');
      });
    }
  }
}