// Copyright (C) 2025, uvok cheetah
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import 'dart:ui';

import 'package:uvok_epaper_badge/model/badge_motive_selection_factory.dart';
import 'package:uvok_epaper_badge/model/device/device.dart';
import 'package:flutter/material.dart';
import 'package:logger/logger.dart';
import 'package:uvok_epaper_badge/model/connection/device_connection.dart';
import 'package:uvok_epaper_badge/model/motive_selection/badge_motive_selection.dart';
import 'package:uvok_epaper_badge/view_model/badge_motive_view_model.dart';
import 'package:uvok_epaper_badge/widgets/badge_motive_list.dart';

var logger = Logger();

class DeviceDetailsScreen extends StatefulWidget {
  final Device device;
  final DeviceConnection deviceConnection;

  late final BadgeMotiveSelection _motiveSelection;
  late final BadgeMotiveViewModel _motiveVM;

  DeviceDetailsScreen({
    super.key,
    required this.device,
    required this.deviceConnection,
  }) {
    _motiveSelection = BadgeMotiveSelectionFactory.createBadgeMotiveSelection(
      device,
    );
    _motiveVM = BadgeMotiveViewModel(motivSelect: _motiveSelection);
  }

  @override
  State<StatefulWidget> createState() {
    return DeviceDetailsState();
  }
}

class DeviceDetailsState extends State<DeviceDetailsScreen> {
  late final AppLifecycleListener appLL;

  /// Whether the back button should be active.
  bool backActive = false;

  DeviceDetailsState() {
    appLL = AppLifecycleListener(
      onExitRequested: () async {
        logger.i("Exit requested");
        dispose();
        return AppExitResponse.exit;
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text("Device details"),
      ),
      body: Center(
        child: ValueListenableBuilder(
          valueListenable: widget.deviceConnection.status,
          builder: (connCtx, ConnectionStatus value, child) {
            return Column(
              spacing: 20,
              children: [
                SizedBox(height: 20),
                Text("Connection state: ${value.toString()}"),
                ElevatedButton(
                  child: Text("Refresh"),
                  onPressed: () async {
                    await widget._motiveVM.updateMotives();
                    await widget._motiveVM.getCurrentMotive();
                  },
                ),
                ListenableBuilder(
                  listenable: widget._motiveVM,
                  builder: (errorCtx, child) {
                    if (widget._motiveVM.errorMessage != null) {
                      var theme = Theme.of(errorCtx);
                      return Text(
                        widget._motiveVM.errorMessage!,
                        style: TextStyle(
                          color: theme.colorScheme.error,
                          fontWeight: FontWeight.bold,
                        ),
                      );
                    }
                    return Container();
                  },
                ),
                BadgeMotiveList(motiveVM: widget._motiveVM),
              ],
            );
          },
        ),
      ),
    );
  }

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

  @override
  void deactivate() {
    logger.i("(widget deactivate)");
    // widget.device.disconnect().ignore();
    super.deactivate();
  }

  @override
  void dispose() {
    logger.i("(widget dispose)");
    widget.deviceConnection.disconnect().ignore();
    super.dispose();
  }

  void _doConnect() async {
    try {
      logger.i("Try to connect...");
      await widget.deviceConnection.connect();
    } catch (e) {
      logger.e(e);
      await widget.deviceConnection.disconnect();
    } finally {
      backActive = true;
    }
  }
}