import 'package:flutter/material.dart';
import 'package:mileograph_flutter/services/apiService.dart';
import 'package:mileograph_flutter/services/authservice.dart';
import 'package:mileograph_flutter/services/dataService.dart';

import 'package:provider/provider.dart';
import 'components/login/login.dart';
import 'components/pages/dashboard.dart';

late ApiService api;

void main() {
  runApp(
    MultiProvider(
      providers: [
        Provider<ApiService>(
          create: (_) {
            api = ApiService(baseUrl: 'https://dev.mileograph.co.uk/api/v1');
            return api;
          },
        ),
        ChangeNotifierProxyProvider<ApiService, AuthService>(
          create: (context) => AuthService(api: context.read<ApiService>()),
          update: (_, api, previous) {
            return previous ?? AuthService(api: api);
          },
        ),
        ProxyProvider<AuthService, void>(
          update: (_, auth, __) {
            api.setTokenProvider(() => auth.token);
          },
        ),
        ChangeNotifierProxyProvider<ApiService, DataService>(
          create: (context) => DataService(api: context.read<ApiService>()),
          update: (_, api, previous) => previous ?? DataService(api: api),
        ),
      ],
      child: MyApp(),
    ),
  );
}

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

  @override
  Widget build(BuildContext context) {
    return Consumer<AuthService>(
      builder: (context, auth, child) {
        return auth.isLoggedIn ? MyHomePage() : LoginScreen();
      },
    );
  }
}

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        useMaterial3: true,
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //fullPage
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.blueGrey),
      ),
      darkTheme: ThemeData(
        useMaterial3: true,
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.blueGrey,
          brightness: Brightness.dark,
        ),
      ),
      themeMode: ThemeMode.system,
      home: AppRoot(),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int pageIndex = 0;
  final List<Widget> contentPages = [
    Dashboard(),
    Center(child: Text("Calculator Page")),
    Center(child: Text("Entries Page")),
    Center(child: Text("Traction Page")),
    Center(child: Text("Trips Page")),
  ];

  bool loggedIn = false;
  bool _fetched = false;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();

    if (!_fetched) {
      _fetched = true;
      WidgetsBinding.instance.addPostFrameCallback((_) {
        final data = context.read<DataService>();
        final auth = context.read<AuthService>();
        api.setTokenProvider(() => auth.token);
        if (data.homepageStats == null) {
          data.fetchHomepageStats();
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    Widget currentPage;

    final data = context.watch<DataService>();
    final auth = context.read<AuthService>();

    if (data.homepageStats != null) {
      currentPage = contentPages[pageIndex];
    } else {
      currentPage = Center(
        child: FilledButton(
          onPressed: data.fetchHomepageStats,
          child: Text("Fetch"),
        ),
      );
    }
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text.rich(
          TextSpan(
            children: [
              TextSpan(text: "Mile"),
              TextSpan(
                text: "O",
                style: TextStyle(color: Colors.red),
              ),
              TextSpan(text: "graph"),
            ],
            style: TextStyle(
              decoration: TextDecoration.none,
              color: Colors.white,
              fontFamily: "Tomatoes",
            ),
          ),
        ),
        actions: [
          IconButton(onPressed: null, icon: Icon(Icons.account_circle)),
          IconButton(onPressed: auth.logout, icon: Icon(Icons.logout)),
        ],
      ),
      bottomNavigationBar: NavigationBar(
        selectedIndex: pageIndex,
        onDestinationSelected: (int index) {
          setState(() {
            pageIndex = index;
          });
        },
        destinations: [
          NavigationDestination(icon: Icon(Icons.home), label: "Home"),
          NavigationDestination(icon: Icon(Icons.route), label: "Calculator"),
          NavigationDestination(icon: Icon(Icons.list), label: "Entries"),
          NavigationDestination(icon: Icon(Icons.train), label: "Traction"),
          NavigationDestination(icon: Icon(Icons.book), label: "Trips"),
        ],
      ),
      body: currentPage,
      floatingActionButton: FloatingActionButton(
        onPressed: null,
        tooltip: 'New Entry',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}