import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_reactive_ble/flutter_reactive_ble.dart';
import 'package:nordic_dfu/nordic_dfu.dart';
import 'package:nrf/app_subscription_state.dart';

class DFU extends StatefulWidget {
  final DiscoveredDevice device;
  final File file;

  const DFU({Key? key, required this.device, required this.file}) : super(key: key);

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

class _State extends State<DFU> with SubscriptionState {
  final ScrollController _scrollController = ScrollController();

  final List<String> _log = [];

  late int start;

  @override
  void initState() {
    super.initState();
    doDfu(widget.device.id, widget.file.path);
  }

  _addLog(String msg) {
    setState(() {
      int now = DateTime.now().millisecondsSinceEpoch;
      _log.add("${(now - start).toString().padLeft(8, "0")} -- $msg");
      _scrollController.jumpTo(_scrollController.position.maxScrollExtent);
    });
  }

  Future<String?> doDfu(String deviceId, String filePath) async {
    await Future.delayed(const Duration(seconds: 3));
    start = DateTime.now().millisecondsSinceEpoch;
    _addLog("DFU start!");
    return await NordicDfu().startDfu(
      deviceId,
      filePath,
      fileInAsset: false,
      onEnablingDfuMode: (deviceAddress) {
        _addLog("EnablingDfuMode");
      },
      onDfuProcessStarted: (deviceAddress) {
        _addLog("DfuProcessStarted");
      },
      onDfuProcessStarting: (deviceAddress) {
        _addLog("DfuProcessStarting");
      },
      onDeviceConnecting: (deviceAddress) {
        _addLog("DeviceConnecting");
      },
      onDeviceConnected: (deviceAddress) {
        _addLog("DeviceConnected");
      },
      onDfuCompleted: (deviceAddress) {
        _addLog("DfuCompleted");
      },
      onFirmwareValidating: (deviceAddress) {
        _addLog("FirmwareValidating");
      },
      onProgressChanged: (
        deviceAddress,
        percent,
        speed,
        avgSpeed,
        currentPart,
        partsTotal,
      ) {
        _addLog("ProgressChanged $percent ${speed.toStringAsFixed(2)} ${avgSpeed.toStringAsFixed(2)} $currentPart $partsTotal");
      },
      onError: (
        String? deviceAddress,
        int? error,
        int? errorType,
        String? message,
      ) {
        _addLog("Error $error $errorType $message");
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("${widget.device.name}"),
      ),
      body: ListView.builder(
        controller: _scrollController,
        itemBuilder: (context, index) {
          return Padding(
            padding: const EdgeInsets.symmetric(vertical: 4.0),
            child: Text(_log[index]),
          );
        },
        itemCount: _log.length,
      ),
    );
  }
}