import 'dart:io';
import 'dart:typed_data';

import 'package:buffer/buffer.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_reactive_ble/flutter_reactive_ble.dart';
import 'package:nrf/app_subscription_state.dart';
import 'package:nrf/dfu_list.dart';
import 'package:nrf/scanner.dart';
import 'package:nrf/test.dart';

class Connector extends StatefulWidget {
  final DiscoveredDevice device;

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

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

class _State extends State<Connector> with SubscriptionState {
  final flutterReactiveBle = FlutterReactiveBle();

  ConnectionStateUpdate? _connectionStateUpdate;
  Object? _connectError;
  QualifiedCharacteristic? characteristicWrite, characteristicNotify;
  final Map<String, String> _writeData = {};
  final Map<String, String> _readData = {};

  late TextEditingController _textEditingController;
  final ValueNotifier<Map> _infoNotifier = ValueNotifier({});
  final ValueNotifier<Map> _electricityNotifier = ValueNotifier({});

  @override
  void initState() {
    super.initState();
    _textEditingController = TextEditingController();
    _connect();
  }

  _connect() {
    cancel();
    setState(() {
      _writeData.clear();
      _readData.clear();
      _infoNotifier.value = {};
      _electricityNotifier.value = {};
      characteristicWrite = characteristicNotify = null;
      _connectionStateUpdate = null;
    });

    addSubscription(flutterReactiveBle
        .connectToDevice(
      id: widget.device.id,
      connectionTimeout: const Duration(seconds: 5),
    )
        .listen((connectionState) {
      if (connectionState.connectionState == DeviceConnectionState.connected) {
        _discoverService();
      }
      setState(() {
        _connectionStateUpdate = connectionState;
      });
    }, onError: (Object error) {
      setState(() {
        _connectError = error;
      });
    }));
  }

  _discoverService() {
    characteristicWrite = characteristicNotify = null;
    final deviceId = widget.device.id;
    flutterReactiveBle.discoverServices(widget.device.id).then((services) {
      for (DiscoveredService service in services) {
        for (var characteristic in service.characteristics) {
          if (characteristic.isWritableWithoutResponse) {
            characteristicWrite = QualifiedCharacteristic(serviceId: service.serviceId, characteristicId: characteristic.characteristicId, deviceId: deviceId);
          }
          if (characteristic.isNotifiable) {
            characteristicNotify = QualifiedCharacteristic(serviceId: service.serviceId, characteristicId: characteristic.characteristicId, deviceId: deviceId);
          }
        }
      }
      if (characteristicNotify != null) {
        addSubscription(flutterReactiveBle.subscribeToCharacteristic(characteristicNotify!).listen((event) {
          _parse(event);
        })..onError((error){setState(() {
          _connectError = error;
        });}));
      }
      setState(() {});
    }).then((value) {
      if (characteristicWrite != null) {
        Stream.periodic(const Duration(seconds: 1)).take(5).forEach((element) {
          _write(Uint8List.fromList([0xB0, 0x01]));
        });
        _write(Uint8List.fromList([0xA1, 0x00]));
      }
    });
  }

  void _parse(List<int> event) {
    if (!mounted) return;
    if (event.isEmpty == true) return;
    print("parse data $event");
    List<int> header = event.sublist(0, 4);
    List<int> content = event.sublist(4, event.length - 1);
    String headerStr = header.map((e) => e.toRadixString(16).padLeft(2, "0")).join(" ").toUpperCase();
    String contentStr = content.map((e) => e.toRadixString(16).padLeft(2, "0")).join(" ").toUpperCase();
    setState(() {
      _readData[headerStr] = headerStr + " " + contentStr;
    });
    switch (event[3]) {
      case 0xA1:
        ByteDataReader reader = ByteDataReader();
        reader.add(content);
        int cmd = reader.readUint8();
        switch (cmd) {
          case 0: // 设备基本信息
            Map<String, dynamic> info = {};
            List<int> name = [];
            for (var i = 0; i < 64; i++) {
              name.add(reader.readUint8());
            }
            info['name'] = String.fromCharCodes(name).replaceAll("\u0000", "");
            List<int> softwareVer = [];
            List<int> hardwareVer = [];
            List<String> device = [];

            for (var i = 0; i < 2; i++) {
              List<String> macList = [];
              for (var j = 0; j < 6; j++) {
                macList.add(reader.readUint8().toRadixString(16).padLeft(2, "0"));
              }
              var mac = macList.join(":").toUpperCase();
              print("mac $i = $mac");

              for (var k = 0; k < 4; k++) {
                hardwareVer.add(reader.readUint8());
              }
              softwareVer.add(reader.readUint16());

              device.add(mac);
            }
            print("bluetooth dfu info $hardwareVer $softwareVer");

            if (hardwareVer.length != 8 || softwareVer.length != 2) return;
            String leftHardware = hardwareVer.sublist(1, 4).join(".");
            String rightHardware = hardwareVer.sublist(4 + 1, hardwareVer.length).join(".");
            int compareHardware = versionCompare(leftHardware, rightHardware);
            String minHardwareVersion = compareHardware < 0 ? leftHardware : rightHardware;
            print("bluetooth hardwareVer  $leftHardware $rightHardware $compareHardware $minHardwareVersion");

            String leftSoftware = hardwareVer.sublist(1, 3).join(".") + ".${softwareVer[0]}";
            String rightSoftware = hardwareVer.sublist(4 + 1, 4 + 1 + 2).join(".") + ".${softwareVer[1]}";
            int compareSoftware = versionCompare(leftSoftware, rightSoftware);
            String minSoftwareVersion = compareSoftware < 0 ? leftSoftware : rightSoftware;
            print("bluetooth softwareVer  $leftSoftware $rightSoftware $compareSoftware $minSoftwareVersion");

            info['softwareVer'] = minSoftwareVersion;
            info['hardwareVer'] = minHardwareVersion;
            info['mac'] = device.length > 1 ? device.first : "";
            info['device'] = device;
            _infoNotifier.value = info;

            break;
          case 1:
            Map<String, dynamic> info = {};
            for (var i = 0; i < 2; i++) {
              info['${i}_electricity'] = reader.readUint8();
              info['${i}_temperature'] = reader.readUint8();
              info['${i}_pressure'] = reader.readUint(4);
              reader.readUint(4);
            }
            if (reader.remainingLength >= 4) {
              info['0_adc'] = reader.readUint16();
              info['1_adc'] = reader.readUint16();
            }
            _electricityNotifier.value = info;
            break;
          default:
            break;
        }
        break;
      default:
        break;
    }
  }

  static int toInt(dynamic v) {
    if (v == null) return 0;
    if (v is String) {
      try {
        return int.parse(v);
      } catch (e) {
        return 0;
      }
    } else if (v is double) {
      try {
        return v.toInt();
      } catch (e) {
        return 0;
      }
    } else if (v is int) {
      return v;
    } else if (v is num) {
      return v.toInt();
    }
    return 0;
  }

  List<int> version(String versionName) {
    if (versionName.isEmpty == true) return [0, 0, 0];
    var arr = versionName.split(".");
    while (arr.length < 3) arr.add("0");
    return arr.map((e) => toInt(e)).toList();
  }

  int versionCompare(String v1, String v2) {
    if (v1 == v2) return 0;
    var clientVersion = version(v1);
    var baseVersion = version(v2);
    int client = (clientVersion[0] << 20) | (clientVersion[1] << 10) | clientVersion[2];
    int base = (baseVersion[0] << 20) | (baseVersion[1] << 10) | baseVersion[2];
    int result = 0;
    if (client > base) {
      result = 1;
    } else if (client == base) {
      result = 0;
    } else {
      result = -1;
    }
    print("versionCompare $clientVersion $baseVersion == $result");
    return result;
  }

  Future _write(Uint8List data) async {
    if (!mounted) return;
    if (characteristicWrite == null) return;
    if (_connectionStateUpdate?.connectionState != DeviceConnectionState.connected) return;

    int length = data.length + 4;
    ByteDataWriter writer = ByteDataWriter();
    writer.writeUint8(0xAA);
    // writer.writeUint8(0xBB);
    // writer.writeUint8(0xCC);
    writer.writeUint8(length);
    writer.writeUint8(0xFF - length);
    // writer.writeUint8(0x00);
    if (data.isNotEmpty) writer.write(data);
    int ver = writer.toBytes().reduce((value, element) => value + element);
    writer.writeUint8(ver);
    Uint8List out = writer.toBytes();
    await flutterReactiveBle.writeCharacteristicWithoutResponse(characteristicWrite!, value: out);
    setState(() {
      _writeData["${data[0]}"] = out.map((e) => e.toRadixString(16).padLeft(2, "0")).join(" ").toUpperCase();
    });
  }

  @override
  Widget build(BuildContext context) {
    List<String> readData = _readData.values.toList();
    List<String> writeData = _writeData.values.toList();
    return Scaffold(
      appBar: AppBar(title: Text("${widget.device.name}"), actions: [
        if (_connectionStateUpdate?.connectionState == DeviceConnectionState.disconnected)
          IconButton(
              onPressed: () {
                _connect();
              },
              icon: const Icon(Icons.link))
      ]),
      body: CustomScrollView(
        slivers: [
          SliverToBoxAdapter(
            child: Column(
              children: [
                Container(
                  padding: const EdgeInsets.all(8.0),
                  child: Text("连接状态: $_connectionStateUpdate, $_connectError"),
                  color: _connectionStateUpdate?.connectionState == DeviceConnectionState.connected ? Colors.green : Colors.grey,
                ),
                ValueListenableBuilder<Map>(
                  valueListenable: _infoNotifier,
                  builder: (_, value, __) => Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Text("鞋子信息: $value"),
                  ),
                ),
                if (_connectionStateUpdate?.connectionState == DeviceConnectionState.connected)
                  Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: GridView(
                      physics: const NeverScrollableScrollPhysics(),
                      shrinkWrap: true,
                      gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3, crossAxisSpacing: 2, mainAxisSpacing: 4, childAspectRatio: 1.78),
                      children: [
                        ElevatedButton(
                          onPressed: () {
                            _discoverService();
                          },
                          child: const Text("发现服务"),
                        ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () async {
                              clearCache();

                              FilePickerResult? result = await FilePicker.platform.pickFiles();

                              String? path = result?.files.single.path ?? "";
                              if (path.isNotEmpty == true) {
                                File file = File(path);

                                Set<DiscoveredDevice> selectedResults = {};
                                List<String> device = _infoNotifier.value["device"];
                                for (var element in device) {
                                  selectedResults.add(DiscoveredDevice(id: element, name: element, manufacturerData: Uint8List.fromList([]), rssi: 0, serviceUuids: [], serviceData: {}));
                                }

                                Navigator.of(context).push(MaterialPageRoute(builder: (context) {
                                  return DFUList(
                                    selectedResults: selectedResults,
                                    file: file,
                                  );
                                })).then((value) => _connect());
                              } else {
                                // User canceled the picker
                              }
                            },
                            child: const Text("DFU"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              ByteDataWriter writer = ByteDataWriter();
                              writer.writeUint8(0xAC);
                              writer.writeUint16(10000);
                              _write(writer.toBytes());
                            },
                            child: const Text("亮灯-(10s)"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              ByteDataWriter writer = ByteDataWriter();
                              writer.writeUint8(0xA4);
                              writer.writeUint16(500);
                              writer.writeUint8(1);
                              _write(writer.toBytes());
                            },
                            child: const Text("震动(左500ms)"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              ByteDataWriter writer = ByteDataWriter();
                              writer.writeUint8(0xA4);
                              writer.writeUint16(500);
                              writer.writeUint8(2);
                              _write(writer.toBytes());
                            },
                            child: const Text("震动(右500ms)"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              ByteDataWriter writer = ByteDataWriter();
                              writer.writeUint8(0xA4);
                              writer.writeUint16(500);
                              writer.writeUint8(0);
                              _write(writer.toBytes());
                            },
                            child: const Text("震动(500ms)"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              _write(Uint8List.fromList([0xA2, 0x01]));
                            },
                            child: const Text("游戏模式 - 开"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () {
                              _write(Uint8List.fromList([0xA2, 0x00]));
                            },
                            child: const Text("游戏模式 - 关"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () async {
                              if (characteristicNotify != null) {
                                _write(Uint8List.fromList([0xA2, 0x02]));
                                await SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: []);
                                await SystemChrome.setPreferredOrientations(Platform.isIOS ? [DeviceOrientation.landscapeRight] : [DeviceOrientation.landscapeLeft]);
                                await Navigator.of(context).push(MaterialPageRoute(builder: (context) {
                                  return Test(
                                    device: widget.device,
                                    characteristicNotify: characteristicNotify!,
                                  );
                                }));
                                _write(Uint8List.fromList([0xA2, 0x00]));
                                await SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: [SystemUiOverlay.bottom, SystemUiOverlay.top]);
                                await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
                              }
                            },
                            child: const Text("硬件数据"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () async {
                              while (characteristicNotify != null) {
                                ByteDataWriter writer = ByteDataWriter();
                                writer.writeUint8(0xAC);
                                writer.writeUint16(10000);
                                _write(writer.toBytes());

                                await Future.delayed(const Duration(seconds: 1));

                                writer = ByteDataWriter();
                                writer.writeUint8(0xA4);
                                writer.writeUint16(500);
                                writer.writeUint8(0);
                                _write(writer.toBytes());
                                await Future.delayed(const Duration(seconds: 1));
                              }
                            },
                            child: const Text("放电"),
                          ),
                        if (characteristicWrite != null)
                          ElevatedButton(
                            onPressed: () async {
                              _write(Uint8List.fromList([0xA1, 0x01]));
                            },
                            child: const Text("电量"),
                          ),
                        ElevatedButton(
                          onPressed: () async {
                            while (mounted) {
                              cancel();
                              await Future.delayed(const Duration(seconds: 3));
                              _connect();
                              await Future.delayed(const Duration(seconds: 5));
                            }
                          },
                          child: const Text("测试10秒重新连接循化"),
                        ),ElevatedButton(
                          onPressed: () async {
                            cancel();
                            await Future.delayed(const Duration(seconds: 3));
                            _connect();
                          },
                          child: const Text("重新连接"),
                        ),
                      ],
                    ),
                  ),
                if (characteristicWrite != null)
                  Container(
                    padding: const EdgeInsets.all(12.0),
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Row(
                          children: [
                            Expanded(
                                child: CupertinoTextField(
                              cursorColor: const Color(0xffFFC400),
                              controller: _textEditingController,
                            )),
                            ElevatedButton(
                              onPressed: () {
                                var data = _textEditingController.value.text;
                                if (data.isEmpty) return;
                                List<int> list = data.split(" ").where((element) => element.isNotEmpty).map((e) => int.parse(e, radix: 16)).toList();
                                _write(Uint8List.fromList(list));
                              },
                              child: const Text("发送"),
                            ),
                          ],
                        ),
                        ValueListenableBuilder(
                          valueListenable: _electricityNotifier,
                          builder: (BuildContext context, value, Widget? child) => Text(
                            "电量: $value",
                          ),
                        ),
                      ],
                    ),
                  ),
              ],
            ),
          ),
          if (characteristicWrite != null)
            const SliverToBoxAdapter(
              child: Padding(
                padding: EdgeInsets.all(12.0),
                child: Text("发送历史"),
              ),
            ),
          if (characteristicWrite != null)
            SliverList(
              delegate: SliverChildBuilderDelegate((content, index) {
                return Padding(
                  padding: const EdgeInsets.symmetric(vertical: 4.0),
                  child: Text("--> ${writeData[index]}"),
                );
              }, childCount: writeData.length),
            ),
          if (characteristicNotify != null)
            const SliverToBoxAdapter(
              child: Padding(
                padding: EdgeInsets.all(12.0),
                child: Text("接收历史"),
              ),
            ),
          if (characteristicWrite != null)
            SliverList(
              delegate: SliverChildBuilderDelegate((content, index) {
                return Padding(
                  padding: const EdgeInsets.symmetric(vertical: 4.0),
                  child: Text("<-- ${readData[index]}"),
                );
              }, childCount: readData.length),
            ),
        ],
      ),
    );
  }
}