import 'dart:async';
import 'dart:io';
import 'dart:typed_data';
import 'dart:ui';

import 'package:buffer/buffer.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';
import 'package:nrf/scanner.dart';

import 'find.dart';

class DFUList extends StatefulWidget {
  final Set<DiscoveredDevice> selectedResults;
  final File file;

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

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

class Device {
  final DiscoveredDevice device;
  String? msg;
  DiscoveredDevice? updateDevice;

  Device(this.device);
}

class DfuEvent {
  final String id;
  final String msg;

  DfuEvent(this.id, this.msg);
}

class _State extends State<DFUList> with SubscriptionState {
  late List<Device> items;

  String? _finishMsg;

  StreamSubscription? scanForDevices;

  final flutterReactiveBle = FlutterReactiveBle();

  @override
  void initState() {
    super.initState();
    items = List.from(widget.selectedResults.map((e) => Device(e)));

    _startDfu().then((value) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text('任务完成，总数：${widget.selectedResults.length}，完成数：$value'),
      ));
      setState(() {
        _finishMsg = '任务完成，总数：${widget.selectedResults.length}，完成数：$value';
      });
      // _search();
    });
  }

  @override
  void dispose() {
    scanForDevices?.cancel();
    NordicDfu().abortDfu();
    super.dispose();
  }

  Future _connect(DiscoveredDevice device, Uint8List data) async {
    int tryCount = 3;
    bool _connecting = true;

    Timer timer = Timer(const Duration(seconds: 30), () {
      _connecting = false;
    });

    await Future.delayed(const Duration(seconds: 2));

    while (tryCount > 0) {
      if (!_connecting) return;

      try {
        final stream = flutterReactiveBle.connectToDevice(id: device.id, connectionTimeout: const Duration(seconds: 10));
        await for (var state in stream) {
          print("device state: $state");
          if (state.connectionState == DeviceConnectionState.connected) {
            var services = await flutterReactiveBle.discoverServices(device.id);
            for (DiscoveredService service in services) {
              for (var characteristic in service.characteristics) {
                if (characteristic.isWritableWithoutResponse) {
                  QualifiedCharacteristic characteristicWrite = QualifiedCharacteristic(serviceId: service.serviceId, characteristicId: characteristic.characteristicId, deviceId: device.id);
                  print("device characteristicWrite: ${device.id} ${service.serviceId} ${characteristic.characteristicId}");

                  for (var i = 0; i < 4; i++) {
                    print("device write light");
                    _write(characteristicWrite, Uint8List.fromList([0xB0, 0x01]));
                    _write(characteristicWrite, data);
                    await Future.delayed(const Duration(milliseconds: 500));
                  }
                  _connecting = false;
                }
              }
            }

            print("device disconnect");
            break;
          } else if (state.connectionState == DeviceConnectionState.disconnected) {
            tryCount--;
            break;
          }
        }

        if (!_connecting) {
          break;
        }
      } catch (e) {
        print("bluetooth -- connect error: $e");
      }

      await Future.delayed(const Duration(seconds: 3));
    }
    timer.cancel();
  }

  _write(QualifiedCharacteristic characteristicWrite, Uint8List data) {
    try {
      int length = data.length + 4;
      ByteDataWriter writer = ByteDataWriter();
      writer.writeUint8(0xAA);
      writer.writeUint8(length);
      writer.writeUint8(0xFF - length);
      if (data.isNotEmpty) writer.write(data);
      int ver = writer.toBytes().reduce((value, element) => value + element);
      writer.writeUint8(ver);
      Uint8List out = writer.toBytes();
      print("write ${characteristicWrite.deviceId} ${characteristicWrite.characteristicId} ${data}");
      flutterReactiveBle.writeCharacteristicWithoutResponse(characteristicWrite, value: out);
    } catch (e) {
      print("write error");
      print(e);
    }
  }

  _search() {
    scanForDevices?.cancel();

    final flutterReactiveBle = FlutterReactiveBle();
    scanForDevices = flutterReactiveBle.scanForDevices(withServices: [Uuid.parse(SH_UUID)]).listen((e) {
      if (e.name.isEmpty) return;
      final knownDeviceIndex = items.indexWhere((d) => d.device.id == e.id);
      if (knownDeviceIndex >= 0) {
        items[knownDeviceIndex].updateDevice = e;
      }
      setState(() {});
    })
      ..onError((e, s) {
        setState(() {
          scanForDevices = null;
        });
      })
      ..onDone(() {
        setState(() {
          scanForDevices = null;
        });
      });
  }

  Future<int> _startDfu() async {
    String file = widget.file.path;
    int num = 0;
    for (var e in items) {
      if (mounted) {
        try {
          print("start dfu ${e.device.id}");
          await doDfu(e.device.id, widget.file.path);
          print("start dfu ${e.device.id} done!");
          num += 1;

          // ByteDataWriter writer = ByteDataWriter();
          // writer.writeUint8(0xB2);
          // await _connect(e.device, writer.toBytes());
        } catch (e) {
          print(e);
        }
        await Future.delayed(const Duration(seconds: 3));
      }
    }
    return num;
  }

  _addLog(String deviceId, String msg) {
    setState(() {
      for (var e in items) {
        if (e.device.id == deviceId || deviceId.contains(e.device.id.substring(0, 12))) {
          e.msg = msg;
        }
      }
    });
  }

  Future<String?> doDfu(String deviceId, String filePath) async {
    DateTime start = DateTime.now();
    _addLog(deviceId, "DFU wait start!");

    return await NordicDfu().startDfu(
      deviceId,
      filePath,
      fileInAsset: false,
      onEnablingDfuMode: (deviceAddress) {
        _addLog(deviceAddress, "EnablingDfuMode");
      },
      onDfuProcessStarted: (deviceAddress) {
        _addLog(deviceAddress, "DfuProcessStarted");
      },
      onDfuProcessStarting: (deviceAddress) {
        _addLog(deviceAddress, "DfuProcessStarting");
      },
      onDeviceConnecting: (deviceAddress) {
        _addLog(deviceAddress, "DeviceConnecting");
      },
      onDeviceConnected: (deviceAddress) {
        _addLog(deviceAddress, "DeviceConnected");
      },
      onDfuCompleted: (deviceAddress) {
        _addLog(deviceAddress, "DfuCompleted use:${DateTime.now().difference(start).inSeconds}s");
      },
      onFirmwareValidating: (deviceAddress) {
        _addLog(deviceAddress, "FirmwareValidating");
      },
      onProgressChanged: (
        deviceAddress,
        percent,
        speed,
        avgSpeed,
        currentPart,
        partsTotal,
      ) {
        _addLog(deviceAddress, "$percent% speed:${avgSpeed.toStringAsFixed(2)}kb/s");
      },
      onError: (
        String? deviceAddress,
        int? error,
        int? errorType,
        String? message,
      ) {
        _addLog(deviceAddress ?? "", "Error $error $errorType $message");
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        actions: [
          if (_finishMsg?.isNotEmpty == true)
            ElevatedButton(
              onPressed: () async {
                _search();
              },
              child: Text("检测升级后版本"),
            ),
          if (scanForDevices != null)
            ElevatedButton(
              onPressed: () async {
                setState(() {
                  scanForDevices?.cancel();
                  scanForDevices = null;
                });
              },
              child: Text("搜索中..."),
            ),
          if (_finishMsg?.isNotEmpty != true)
            IconButton(
              icon: const CircularProgressIndicator(
                backgroundColor: Colors.white,
              ),
              onPressed: () {},
            ),
        ],
      ),
      body: Column(
        children: [
          Text("升级文件：${widget.file}"),
          if (_finishMsg?.isNotEmpty == true)
            Center(
              child: Text("$_finishMsg"),
            ),
          Expanded(
            child: ListView.builder(
              itemBuilder: (context, index) {
                return Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: [
                      Column(
                        children: [
                          ConstrainedBox(
                            constraints: const BoxConstraints(maxWidth: 140.0),
                            child: Text(
                              items[index].device.name,
                              style: const TextStyle(fontSize: 14, color: Color(0xff333333)),
                              softWrap: true,
                            ),
                          ),
                          ConstrainedBox(
                            constraints: const BoxConstraints(maxWidth: 140.0),
                            child: Text(
                              items[index].device.id,
                              style: const TextStyle(fontSize: 12, color: Color(0xff999999)),
                            ),
                          ),
                          Text(
                            "${items[index].device.manufacturerData}",
                            style: const TextStyle(fontSize: 12, color: Color(0xff999999)),
                          ),
                          if (items[index].updateDevice != null && items[index].updateDevice!.manufacturerData.length > 1)
                            Text(
                              " --> ${items[index].updateDevice!.manufacturerData}",
                              style: TextStyle(
                                  fontSize: 12,
                                  color: items[index].device.manufacturerData.isEmpty
                                      ? Colors.green
                                      : (items[index].updateDevice!.manufacturerData[0] > items[index].device.manufacturerData[0])
                                          ? Colors.green
                                          : Colors.redAccent),
                            ),
                        ],
                        crossAxisAlignment: CrossAxisAlignment.start,
                      ),
                      const SizedBox(
                        width: 12,
                      ),
                      Expanded(
                        child: Text("${items[index].msg}"),
                      ),
                      ElevatedButton(
                        onPressed: () async {
                          await showDialog(
                            context: context,
                            builder: (context) => Find(device: items[index].device),
                          );
                        },
                        child: const Text("找鞋"),
                      ),
                    ],
                  ),
                );
              },
              itemCount: items.length,
            ),
          ),
        ],
      ),
    );
  }
}