import 'package:cdb_ui/api.dart';
import 'package:cdb_ui/pages/itemview.dart';
import 'package:cdb_ui/pages/setup.dart';
import 'package:flutter/material.dart';

Future<void> main() async {
  await API().init();
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CDB',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
            seedColor: Colors.deepPurple, brightness: Brightness.dark),
        useMaterial3: true,
      ),
      home: API().isInit() ? const MyHomePage() : const SetupPage(),
    );
  }
}

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

  Future<(List<MinItem>, List<Transaction>)> _fetchData() async {
    return (await API().getItemsUnderMin(), await API().getExpiredItems());
  }

  @override
  Widget build(BuildContext context) {
    // todo : add global statistics
    // todo : demand stat
    // todo : stat on origin + destination

    return Scaffold(
      body: FutureBuilder(
        future: _fetchData(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return const CircularProgressIndicator();
          }

          var data = snapshot.data!;
          var min = data.$1;
          var expired = data.$2;

          return Column(
            children: [
              if (min.isNotEmpty)
                const ListTile(title: Text("Items under Minimum")),
              ...min.map((item) {
                return ListTile(
                  title: Text(
                      "Item ${item.itemVariant} under minimum. Needs ${item.need} more."),
                );
              }).toList(),

              if (expired.isNotEmpty)
                const ListTile(title: Text("Expired Items")),

              // Mapping expired list to widgets
              ...expired.map((item) {
                return ListTile(
                  title: TransactionCard(item, () {}),
                );
              }).toList(),
            ],
          );
        },
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    // todo : add flow list
    // todo : flows by item produced
    // todo : flow page
    return const Scaffold();
  }
}

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

  @override
  Widget build(BuildContext context) {
    // todo : add locations tree view
    return const Scaffold();
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Items"),
      ),
      body: FutureBuilder(
          future: API().getItems(),
          builder: (context, snapshot) {
            if (!snapshot.hasData) {
              return const CircularProgressIndicator();
            }

            var items = snapshot.data!;

            return ListView(
                children: items.map((x) {
              return ItemTile(x);
            }).toList());
          }),
    );
  }
}

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

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

class _MyHomePageState extends State<MyHomePage> {
  int pageIndex = 0;

  List<Widget> pages = [
    const StatsPage(),
    const ItemsPage(),
    const FlowsPage(),
    const LocationsPage()
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: BottomNavigationBar(
        fixedColor: Colors.white,
        unselectedItemColor: Colors.white70,
        items: const [
          BottomNavigationBarItem(icon: Icon(Icons.home), label: "Home"),
          BottomNavigationBarItem(
              icon: Icon(Icons.data_object), label: "Items"),
          BottomNavigationBarItem(icon: Icon(Icons.receipt), label: "Flows"),
          BottomNavigationBarItem(
              icon: Icon(Icons.location_city), label: "Locations"),
        ],
        currentIndex: pageIndex,
        onTap: (value) {
          setState(() {
            pageIndex = value;
          });
        },
      ),
      body: pages[pageIndex],
    );
  }
}

class ItemTile extends StatelessWidget {
  final String item;

  const ItemTile(this.item, {super.key});

  @override
  Widget build(BuildContext context) {
    return ListTile(
      onTap: () {
        API().getItem(item).then((itemInfo) => Navigator.push(context,
            MaterialPageRoute(builder: (context) => ItemView(item: itemInfo))));
      },
      title: Text(item),
    );
  }
}