import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:outbag_app/backend/errors.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/tools/fetch_wrapper.dart';
import 'package:provider/provider.dart';
import 'package:routemaster/routemaster.dart';
import 'dart:math';

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

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

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

class _EditRoomPageState extends State<EditRoomPage> {
  final TextEditingController _ctrName = TextEditingController();
  final TextEditingController _ctrID = TextEditingController();
  final TextEditingController _ctrDescription = TextEditingController();
  RoomIcon _ctrIcon = RoomIcon.other;
  Room? room;

  // show spinner by default
  // until data has been fetched
  bool showSpinner = true;

  void initFromRoom(Room room) {
    _ctrID.text = room.id;
    _ctrName.text = room.name;
    _ctrDescription.text = room.description;
    _ctrIcon = room.icon!;

    setState(() {
        this.room = room;
    });
  }

  // fetch room information
  void fetchInfo() {
    final sm = ScaffoldMessenger.of(context);
    final rmaster = Routemaster.of(context);
    final user = context.read<User>();

    doNetworkRequest(
      sm,
      req: () => postWithCreadentials(
        path: 'getRoomInfo',
        credentials: user,
        target: user.server,
        body: {'room': widget.tag, 'server': widget.server}),
      onOK: (body) async {
        final room = Room.fromJSON(body['data']);
        room.toDisk();
      },
      onNetworkErr: () {
        // no room data available
        // use data from disk
        (() async {
            try {
              final diskRoom =
              await Room.fromDisk(serverTag: widget.server, id: widget.tag);
              initFromRoom(diskRoom);
            } catch (_) {
              // no room data available
              // close screen
              rmaster.replace('/');
            }
        })();
        return true;
      },
      onServerErr: (json) {
        // user not allowed to be here
        // close screen
        rmaster.replace('/');
        return true;
      },
    );
  }

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

    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 room =
          await Room.fromDisk(serverTag: widget.server, id: widget.tag);

          initFromRoom(room);

          setState(() {
              showSpinner = false;
          });
        } catch (_) {}
    });

    WidgetsBinding.instance.addPostFrameCallback((_) => fetchInfo());
  }

  @override
  Widget build(BuildContext context) {
    final textTheme = Theme.of(context)
    .textTheme
    .apply(displayColor: Theme.of(context).colorScheme.onSurface);

    double width = MediaQuery.of(context).size.width;
    double height = MediaQuery.of(context).size.height;
    double smallest = min(min(width, height), 400);

    return showSpinner
    ? Scaffold(
      body: Center(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const CircularProgressIndicator(),
            Text('Loading', style: textTheme.titleLarge),
    ])))
    : Scaffold(
      appBar: AppBar(
        title: const Text('Edit Room'),
        leading: IconButton(
          onPressed: () {
            // go back
            Navigator.of(context).pop();
          },
          icon: const Icon(Icons.arrow_back),
          tooltip: "Go back",
        ),
      ),
      body: SingleChildScrollView(
        child: Center(
          child: Padding(
            padding: const EdgeInsets.all(14),
            child: ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 400),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  IconButton(
                    icon: SvgPicture.asset(
                      _ctrIcon.img,
                      width: smallest * 0.3,
                      height: smallest * 0.3,
                    ),
                    tooltip: 'Change room icon',
                    onPressed: () {
                      showDialog(
                        context: context,
                        builder: (ctx) => AlertDialog(
                          title: const Text(
                            'Choose a room Icon'),
                          actions: const [],
                          content: SizedBox(
                            width: smallest * 0.3 * 3,
                            height: smallest * 0.3 * 3,
                            child: GridView.count(
                              crossAxisCount: 3,
                              children: RoomIcon.list()
                              .map((icon) {
                                  return GridTile(
                                    child: IconButton(
                                      icon: SvgPicture
                                      .asset(
                                        icon.img,
                                        width:
                                        smallest *
                                        0.3,
                                        height:
                                        smallest *
                                        0.3,
                                      ),
                                      tooltip:
                                      icon.text,
                                      onPressed: () {
                                        setState(() {
                                            _ctrIcon =
                                            icon;
                                        });
                                        Navigator.of(
                                          context)
                                        .pop();
                                  }));
                              }).toList())),
                      ));
                    },
                  ),
                  Padding(
                    padding: const EdgeInsets.all(8),
                    child: TextField(
                      enabled: false,
                      controller: _ctrID,
                      keyboardType: TextInputType.emailAddress,
                      decoration: const InputDecoration(
                        prefixIcon: Icon(Icons.fact_check),
                        labelText: 'Room ID',
                        hintText: 'Unique room id',
                        helperText:
                        'the room id and server tag allow the room to be identified',
                        border: OutlineInputBorder(),
                      ),
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(8),
                    child: TextField(
                      controller: _ctrName,
                      keyboardType: TextInputType.name,
                      decoration: const InputDecoration(
                        prefixIcon: Icon(Icons.badge),
                        labelText: 'Room Name',
                        hintText: 'Give your room a name',
                        helperText:
                        'Easily identify a room with a human readable name',
                        border: OutlineInputBorder(),
                      ),
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(8),
                    child: TextField(
                      controller: _ctrDescription,
                      keyboardType: TextInputType.text,
                      decoration: const InputDecoration(
                        prefixIcon: Icon(Icons.dns),
                        labelText: 'Room Description',
                        hintText: 'Briefly describe your Room',
                        helperText:
                        'Make it easier for other to know what this room is used for',
                        border: OutlineInputBorder(),
                      ),
                    ),
                  ),
                ],
      ))))),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () async {
          final scaffMgr = ScaffoldMessenger.of(context);
          final nav = Navigator.of(context);

          // name may not be empty
          if (_ctrName.text.isEmpty) {
            final snackBar = SnackBar(
              behavior: SnackBarBehavior.floating,
              content: const Text('Please specify a room name'),
              action: SnackBarAction(
                label: 'Ok',
                onPressed: () {
                  scaffMgr.hideCurrentSnackBar();
                },
              ),
            );

            scaffMgr.hideCurrentSnackBar();
            scaffMgr.showSnackBar(snackBar);

            return;
          }

          User user;
          try {
            user = await User.fromDisk();
          } catch (_) {
            // user data invalid
            // shouldn't happen
            return;
          }

          Room clone = room!;
          clone.name = _ctrName.text;
          clone.description = _ctrDescription.text;
          clone.icon = _ctrIcon;

          try {
            final resp = await postWithCreadentials(
              target: user.server,
              credentials: user,
              path: 'changeRoomMeta',
              body: {
                'room': clone.id,
                'server': clone.serverTag,
                'title': clone.name,
                'description': clone.description,
                'icon': clone.icon?.type,
            });
            if (resp.res == Result.ok) {
              // room was created
              // save room
              await clone.toDisk();
              nav.pop();
            } else {
              // error
              final snackBar = SnackBar(
                behavior: SnackBarBehavior.floating,
                content: Text(errorAsString(resp.body)),
                action: SnackBarAction(
                  label: 'Dismiss',
                  onPressed: () {
                    scaffMgr.hideCurrentSnackBar();
                  },
                ),
              );

              scaffMgr.hideCurrentSnackBar();
              scaffMgr.showSnackBar(snackBar);
            }
          } catch (_) {
            final snackBar = SnackBar(
              behavior: SnackBarBehavior.floating,
              content: const Text('Network error'),
              action: SnackBarAction(
                label: 'Dismiss',
                onPressed: () {
                  scaffMgr.hideCurrentSnackBar();
                },
              ),
            );

            scaffMgr.hideCurrentSnackBar();
            scaffMgr.showSnackBar(snackBar);
          }
        },
        label: const Text('Update'),
        icon: const Icon(Icons.edit)),
    );
  }
}