// Flutter
import 'package:flutter/material.dart';

// Local
import '/pages/expense.dart';
import '/pages/income.dart';
import '/pages/asset.dart';
import '/pages/report.dart';
import '/pages/settings.dart';
import '/db.dart';

void main() {
  loadDB();
  runApp(const MainApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Recurring Expense Tracker',
      theme: ThemeData(
        useMaterial3: true,
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
      ),
      darkTheme: ThemeData(
        useMaterial3: true,
        brightness: Brightness.dark,
        colorSchemeSeed: Colors.green,
      ),
      themeMode: ThemeMode.system,
      home: HomePage(),
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  var pageSelected = 0;

  refresh() {
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    Widget page;
    Widget? dialog;
    switch (pageSelected) {
      case 0:
        page = ExpensePage();
        dialog = ExpenseInputDialog(
          notifyParent: refresh,
        );
      case 1:
        page = IncomePage();
      case 2:
        page = AssetPage();
      case 3:
        page = ProjectionPage();
      case 4:
        page = SettingsPage();
      default:
        throw UnimplementedError('No widget for page $pageSelected yet!');
    }

    Future<void> addNewValue(BuildContext context) {
      return showDialog(
        context: context,
        builder: (_) => AlertDialog(content: dialog),
      );
    }

    Widget? floatingButton;
    if (dialog != null) {
      floatingButton = IconButton(
        onPressed: () {
          addNewValue(context);
        },
        icon: Icon(Icons.add),
        color: Theme.of(context).colorScheme.onSurface,
      );
    }

    return LayoutBuilder(builder: (context, constraints) {
      return Scaffold(
        appBar: AppBar(title: Text("Expense Tracker")),
        drawer: NavigationRail(
          extended: true,
          destinations: [
            NavigationRailDestination(
              icon: Icon(Icons.payment),
              label: Text('Expenses'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.account_balance),
              label: Text('Income'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.attach_money),
              label: Text('Liquid Assets'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.bar_chart),
              label: Text('Reports'),
            ),
            NavigationRailDestination(
              icon: Icon(Icons.settings),
              label: Text('Settings'),
            ),
          ],
          selectedIndex: pageSelected,
          onDestinationSelected: (value) {
            setState(() {
              pageSelected = value;
              Navigator.pop(context);
            });
          },
        ),
        body: Container(
          color: Theme.of(context).colorScheme.primaryContainer,
          child: Center(child: page),
        ),
        floatingActionButton: floatingButton,
      );
    });
  }
}