// 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 'package:uvok_epaper_badge/control/scanner_controller.dart';
import 'package:uvok_epaper_badge/widgets/device_details.dart';
import 'package:uvok_epaper_badge/widgets/device_scan_select.dart';
import 'package:uvok_epaper_badge/model/device/device.dart';
import 'package:flutter/material.dart';
import 'package:logger/logger.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:uvok_epaper_badge/model/device_connection.dart';
import 'package:uvok_epaper_badge/model/device_connection_factory.dart';

var logger = Logger();

class ScanPage extends StatefulWidget {
  const ScanPage({super.key, required this.title, required this.deviceScanner});

  // Original doc: Fields in a Widget subclass are always marked "final".

  final String title;
  final ScannerController deviceScanner;

  @override
  State<ScanPage> createState() => _ScanPageState();
}

class _ScanPageState extends State<ScanPage> {
  Device? selectedDevice;

  void _doConnect() async {
    final Device? dev = selectedDevice;
    if (dev == null) return;

    final DeviceConnection connection =
        DeviceConnectionFactory.createConnection(dev);
    //???
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) =>
            DeviceDetailsScreen(device: dev, deviceConnection: connection),
      ),
    );
  }

  void _doScan() async {
    setState(() {
      selectedDevice = null;
    });

    // ...
    await widget.deviceScanner.startScan();
  }

  Future getPermissions() async {
    try {
      await Permission.bluetooth.request();
    } catch (e) {
      logger.e(e.toString());
    }
  }

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

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: widget.deviceScanner.statusStream,
      initialData: ScanStatus.idle,
      builder: (context, asyncSnapshot) {
        bool isScanning = asyncSnapshot.data == ScanStatus.scanning;
        return Scaffold(
          appBar: AppBar(
            backgroundColor: Theme.of(context).colorScheme.inversePrimary,
            title: Text(widget.title),
          ),
          body: Center(
            child: Column(
              // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
              // action in the IDE, or press "p" in the console), to see the
              // wireframe for each widget.
              mainAxisAlignment: MainAxisAlignment.center,
              spacing: 24,
              children: <Widget>[
                SizedBox(height: 15),
                Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  spacing: 15.0,
                  children: [
                    ElevatedButton(
                      onPressed: isScanning ? null : _doScan,
                      child: isScanning
                          ? Text("Scanning...")
                          : Text("Start scan"),
                    ),
                    ElevatedButton(
                      onPressed: (selectedDevice == null || isScanning)
                          ? null
                          : _doConnect,
                      child: Text("Connect"),
                    ),
                  ],
                ),
                StreamBuilder(
                  stream: widget.deviceScanner.scanResultsStream,
                  initialData: <Device>[],
                  builder: (context, asyncSnapshot) {
                    return DeviceScanSelection(
                      items: asyncSnapshot.data ?? [],
                      onItemSelected: (item) {
                        setState(() => selectedDevice = item);
                      },
                    );
                  },
                ),
              ],
            ),
          ),
        );
      },
    );
  }
}