import 'package:flutter/material.dart';
import 'package:outbag_app/backend/request.dart';
import 'package:outbag_app/backend/room.dart';
import 'package:outbag_app/backend/user.dart';
import 'package:outbag_app/screens/room/pages/about.dart';
import 'package:outbag_app/screens/room/pages/categories.dart';
import 'package:outbag_app/screens/room/pages/products.dart';
import 'package:outbag_app/screens/room/pages/list.dart';
import 'package:routemaster/routemaster.dart';

class RoomPage extends StatefulWidget {
  final String server;
  final String tag;

  const RoomPage(this.server, this.tag, {super.key});

  @override
  State<StatefulWidget> createState() => _RoomPageState();
}

class _RoomPageState extends State<RoomPage> {
  RoomInfo? info;
  Room? room;

  final PageController _ctr = PageController(initialPage: 0);
  int page = 0;

  // fetch room information
  void fetchInfo() async {
    bool foundData = false;

    try {
      final diskRoom =
          await Room.fromDisk(serverTag: widget.server, id: widget.tag);
      foundData = true;
      setState(() {
        room = diskRoom;
      });
    } catch (_) {}

    // fetch additional data from web
    User user;
    try {
      user = await User.fromDisk();
    } catch (_) {
      // probably not logged in
      return;
    }

    try {
      final resp = await postWithCreadentials(
          path: 'getRoomInfo',
          credentials: user,
          target: user.server,
          body: {'room': widget.tag, 'server': widget.server});
      if (resp.res == Result.ok) {
        final info = RoomInfo.fromJSON(resp.body['data']);
        final room = Room.fromJSON(resp.body['data']);

        room.toDisk();
        foundData = true;

        setState(() {
          this.info = info;
        });
      }
    } catch (_) {}

    if (!foundData) {
      // no room data available
      // TODO: close room
      // or show snackbar
      // BUG: there is currently no way of implementing this,
      // because there is no context available here
    }
  }

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

    // schedule info-get
    fetchInfo();

    _ctr.addListener(() {
      setState(() {
        page = _ctr.page?.toInt() ?? _ctr.initialPage;
      });
    });

    Room.listen((_) async {
      // rooms changed on disk
      // probably this one,
      // because it is currently open
      // NOTE: might be a different room
      // (if a background listener is implemented at some point,
      // checking if this room changed might improve performance)
      try {
        final r = await Room.fromDisk(serverTag: widget.server, id: widget.tag);
        setState(() {
          room = r;
        });
      } catch (_) {}
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(room?.name ?? 'Unknown Room'),
        leading: IconButton(
          onPressed: () {
            // go back
            Routemaster.of(context).history.back();
          },
          icon: const Icon(Icons.arrow_back),
          tooltip: "Go back",
        ),
      ),
      body: PageView(
        controller: _ctr,
        children: [
          ShoppingListPage(room, info),
          RoomProductsPage(room, info),
          RoomCategoriesPage(room, info),
          AboutRoomPage(room, info)
        ],
      ),
      bottomNavigationBar: NavigationBar(
        onDestinationSelected: (int index) {
          _ctr.animateToPage(index,
              curve: Curves.easeInOut,
              duration: const Duration(milliseconds: 300));
        },
        selectedIndex: page,
        destinations: const [
          NavigationDestination(
              icon: Icon(Icons.list),
              label: "List",
              tooltip: 'View shopping list'),
          NavigationDestination(
              icon: Icon(Icons.inventory_2),
              label: "Products",
              tooltip: 'View saved items'),
          NavigationDestination(
              icon: Icon(Icons.category),
              label: "Categories",
              tooltip: 'View categories'),
          NavigationDestination(
              icon: Icon(Icons.info_rounded),
              label: "About",
              tooltip: 'View room info'),
        ],
      ),
    );
  }
}