import 'dart:async';
import 'dart:io';
import 'dart:math';

import 'package:file_picker/file_picker.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/connector.dart';
import 'package:nrf/dfu_list.dart';
import 'package:nrf/find.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:wakelock/wakelock.dart';

const SH_UUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";

Future clearCache() async {
  await delDir(await getTemporaryDirectory());
  if (Platform.isAndroid) {
    var dir = await getExternalStorageDirectory();
    if (dir != null) await delDir(dir);
  }
}

///递归方式删除目录
Future<Null> delDir(FileSystemEntity file) async {
  print(("del path $file"));
  if (file is Directory) {
    try {
      final List<FileSystemEntity> children = file.listSync();
      for (final FileSystemEntity child in children) {
        await delDir(child);
      }
    } catch (e) {
      print(e);
    }
  } else {
    await file.delete();
  }
}

class Scanner extends StatefulWidget {
  const Scanner({Key? key}) : super(key: key);

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

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

  bool _selectAll = false;
  double _filterRssi = 35;
  bool _filterNameEquals = true;
  bool _filterSofewareEquals = true;
  bool _filterHardwareEquals = true;
  String? _filterName = "";
  String? _filterSofeware = "";
  String? _filterHardware = "";

  StreamSubscription? scanForDevices;
  List<DiscoveredDevice> scanResults = <DiscoveredDevice>[];
  Set<DiscoveredDevice> selectedResults = {};

  bool _dfuAll = false;
  DiscoveredDevice? _targetDevice;
  int _countAll = 0;
  int _countSucc = 0;
  int _countFail = 0;
  final ValueNotifier<String> _messageNotifier = ValueNotifier<String>("");

  @override
  void initState() {
    super.initState();
    addSubscription(flutterReactiveBle.statusStream.listen((event) {
      print("bluetooth -- instance state $event");
      if (event == BleStatus.ready) {
      } else if (event == BleStatus.unknown) {
      } else if (event == BleStatus.poweredOff) {
      } else {}
    }));

    _grant();
    clearCache();
    Wakelock.enable();
  }

  _grant() async {
    if (Platform.isAndroid) {
      PermissionStatus permissions = await Permission.locationWhenInUse.request();

      if (permissions.isGranted) {
      } else {
        showDialog(
          context: context,
          builder: (context) => const SimpleDialog(title: Text('使用蓝牙功能需授权定位权限')),
        );
      }
    }
  }

  _search() {
    FocusScope.of(context).requestFocus(FocusNode());
    scanForDevices?.cancel();
    setState(() {
      selectedResults.clear();
      scanResults.clear();
    });

    scanForDevices = flutterReactiveBle.scanForDevices(withServices: [Uuid.parse(SH_UUID)]).listen((e) {
      if (e.name.isEmpty) return;
      // print("111111111111111111111111 ${e}");
      final knownDeviceIndex = scanResults.indexWhere((d) => d.id == e.id);
      if (knownDeviceIndex >= 0) {
        scanResults[knownDeviceIndex] = e;
      } else {
        scanResults.add(e);
      }
      setState(() {});
    })
      ..onDone(() {
        setState(() {
          scanForDevices = null;
        });
      });
  }

  List<DiscoveredDevice> updateResults = <DiscoveredDevice>[];
  Map<DiscoveredDevice, int> failedResults = {};

  _dfu(String path, int type) async {
    updateResults.clear();
    failedResults.clear();

    while (mounted) {
      try {
        _messageNotifier.value = "开始搜索...(M$type)";
        DiscoveredDevice device;
        if (type == 1) {
          List<DiscoveredDevice> scanResults = <DiscoveredDevice>[];
          Completer<bool> completer = Completer();
          int times = 0;
          Timer timeout = Timer.periodic(const Duration(seconds: 5), (t) {
            if(scanResults.isNotEmpty) {
              completer.complete(true);
            }else{
              _messageNotifier.value = "开始搜索...(M$type .... ${times++})";
            }
          });

          var stream = flutterReactiveBle.scanForDevices(withServices: [Uuid.parse(SH_UUID)], scanMode: ScanMode.lowPower);
          var listen = stream.listen((event) {
            if (scanResults.where((element) => element.id == event.id).isEmpty && (failedResults[event] ?? 0) < 3) {
              List<DiscoveredDevice> results = [event];
              scanResults.addAll(results
                  .where((element) => updateResults.where((event) => element.id == event.id).isEmpty)
                  .where((element) => element.rssi.abs() < _filterRssi).where((element) => element.name.contains(_filterName ?? "") == _filterNameEquals).where((element) {
                if (_filterHardware?.isNotEmpty == true) {
                  if (element.manufacturerData.length >= 6 && (_filterHardware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[5]}") == _filterHardwareEquals) {
                    return true;
                  } else {
                    return false;
                  }
                }
                return true;
              }).where((element) {
                if (_filterSofeware?.isNotEmpty == true) {
                  if (element.manufacturerData.length >= 6 && (_filterSofeware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[0]}") == _filterSofewareEquals) {
                    return true;
                  } else {
                    return false;
                  }
                }
                return true;
              }));
            }
          });
          await completer.future;
          listen.cancel();
          timeout.cancel();

          _messageNotifier.value = "搜索到 ${scanResults.map((e) => e.name).join(", ")}";

          if (scanResults.isEmpty) {
            await Future.delayed(const Duration(seconds: 2));
            continue;
          }

          device = scanResults[Random().nextInt(scanResults.length)];
        } else {
          device = await flutterReactiveBle
              .scanForDevices(withServices: [Uuid.parse(SH_UUID)])
              .where((element) => updateResults.where((event) => element.id == event.id).isEmpty)
              .where((element) => failedResults.keys.where((event) => element.id == event.id).isEmpty)
              .where((element) => element.rssi.abs() < _filterRssi)
              .where((element) => element.name.contains(_filterName ?? "") == _filterNameEquals)
              .where((element) {
                if (_filterHardware?.isNotEmpty == true) {
                  if (element.manufacturerData.length >= 6 && (_filterHardware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[5]}") == _filterHardwareEquals) {
                    return true;
                  } else {
                    return false;
                  }
                }
                return true;
              })
              .firstWhere((element) {
                if (_filterSofeware?.isNotEmpty == true) {
                  if (element.manufacturerData.length >= 6 && (_filterSofeware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[0]}") == _filterSofewareEquals) {
                    return true;
                  } else {
                    return false;
                  }
                }
                return true;
              });
        }

        setState(() {
          _countAll++;
          _targetDevice = device;
        });
        await Future.delayed(const Duration(seconds: 2));

        DateTime start = DateTime.now();
        try {
          await NordicDfu().startDfu(device.id, path, fileInAsset: false, onEnablingDfuMode: (deviceAddress) {
            _messageNotifier.value = "EnablingDfuMode";
          }, onDfuCompleted: (deviceAddress) {
            _messageNotifier.value = "DfuCompleted use:${DateTime.now().difference(start).inSeconds}s";
            _countSucc++;
            updateResults.add(device);
          }, onDfuProcessStarted: (deviceAddress) {
            _messageNotifier.value = "DfuProcessStarted";
          }, onDfuProcessStarting: (deviceAddress) {
            _messageNotifier.value = "DfuProcessStarting";
          }, onDeviceConnecting: (deviceAddress) {
            _messageNotifier.value = "DeviceConnecting";
          }, onDeviceConnected: (deviceAddress) {
            _messageNotifier.value = "DeviceConnected";
          }, onProgressChanged: (
            deviceAddress,
            percent,
            speed,
            avgSpeed,
            currentPart,
            partsTotal,
          ) {
            _messageNotifier.value = "$percent% speed:${avgSpeed.toStringAsFixed(2)}kb/s";
          }, onError: (
            String? deviceAddress,
            int? error,
            int? errorType,
            String? message,
          ) {
            _messageNotifier.value = "Error $error $errorType $message";
            _countFail++;
            failedResults[device] = (failedResults[device] ?? 0)+1;
          });
        } catch (e) {
          print(e);
          _messageNotifier.value = "升级异常: $e";
        }
      } catch (e) {
        print(e);
        _messageNotifier.value = "异常: $e";
      }
      setState(() {
        _targetDevice = null;
      });
      await Future.delayed(const Duration(seconds: 2));
    }
  }

  @override
  Widget build(BuildContext context) {
    List<DiscoveredDevice> items = <DiscoveredDevice>[];
    items.addAll(scanResults.where((element) => element.rssi.abs() < _filterRssi).where((element) => element.name.contains(_filterName ?? "") == _filterNameEquals).where((element) {
      if (_filterHardware?.isNotEmpty == true) {
        if (element.manufacturerData.length >= 6 && (_filterHardware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[5]}") == _filterHardwareEquals) {
          return true;
        } else {
          return false;
        }
      }
      return true;
    }).where((element) {
      if (_filterSofeware?.isNotEmpty == true) {
        if (element.manufacturerData.length >= 6 && (_filterSofeware == "${element.manufacturerData[3]}.${element.manufacturerData[4]}.${element.manufacturerData[0]}") == _filterSofewareEquals) {
          return true;
        } else {
          return false;
        }
      }
      return true;
    }));
    items.sort((a, b) {
      return a.rssi.abs() > b.rssi.abs() ? 1 : -1;
    });
    return Scaffold(
      appBar: _dfuAll
          ? null
          : AppBar(
              title: const Text("发现设备"),
              actions: [
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: ElevatedButton(
                      onPressed: () {
                        setState(() {
                          scanForDevices?.cancel();
                          scanForDevices = null;
                          _selectAll = !_selectAll;
                        });
                      },
                      child: _selectAll ? const Text("取消多选") : const Text("多选")),
                ),
                scanForDevices == null
                    ? IconButton(
                        onPressed: () {
                          setState(() {
                            _search();
                          });
                        },
                        icon: const Icon(Icons.search))
                    : IconButton(
                        onPressed: () {
                          setState(() {
                            scanForDevices?.cancel();
                            scanForDevices = null;
                          });
                        },
                        icon: const Icon(Icons.stop))
              ],
            ),
      body: _dfuAll
          ? Container(
              width: double.infinity,
              height: double.infinity,
              color: Colors.white,
              child: Column(
                children: [
                  const SizedBox(
                    height: 50,
                  ),
                  Text("升级固件(总数：$_countAll/成功：$_countSucc/失败：$_countFail)"),
                  const SizedBox(
                    height: 25,
                  ),
                  ConstrainedBox(
                    constraints: const BoxConstraints(maxWidth: 140.0),
                    child: Text(
                      "${_targetDevice?.name}",
                      style: const TextStyle(fontSize: 14, color: Color(0xff333333)),
                      softWrap: true,
                    ),
                  ),
                  const SizedBox(
                    height: 25,
                  ),
                  ConstrainedBox(
                    constraints: const BoxConstraints(maxWidth: 140.0),
                    child: Text(
                      "${_targetDevice?.id}",
                      style: const TextStyle(fontSize: 12, color: Color(0xff999999)),
                    ),
                  ),
                  const SizedBox(
                    height: 25,
                  ),
                  Text(
                    "${_targetDevice?..manufacturerData}",
                    style: const TextStyle(fontSize: 12, color: Color(0xff999999)),
                  ),
                  const SizedBox(
                    height: 25,
                  ),
                  ValueListenableBuilder(
                    valueListenable: _messageNotifier,
                    builder: (BuildContext context, String value, Widget? child) => Text(
                      value,
                    ),
                  ),
                  const SizedBox(
                    height: 50,
                  ),
                  Container(
                    padding: const EdgeInsets.all(12.0),
                    height: 200,
                    child: SingleChildScrollView(
                      child: Text("升级列表 ... ${updateResults.map((e) => e.name).join(", ")}"),
                    ),
                  )
                ],
              ),
            )
          : Column(
              children: [
                Container(
                  padding: const EdgeInsets.all(12.0),
                  child: Column(
                    children: [
                      Row(
                        children: [
                          const Text("rssi"),
                          Padding(
                            padding: const EdgeInsets.symmetric(horizontal: 8.0),
                            child: Text("< ${_filterRssi.toInt()}"),
                          ),
                          Expanded(
                            child: Slider(
                              min: 20,
                              max: 100,
                              value: _filterRssi,
                              onChanged: (v) {
                                setState(() {
                                  _filterRssi = v;
                                });
                              },
                            ),
                          )
                        ],
                      ),
                      Row(
                        children: [
                          const Text("关键字"),
                          Checkbox(
                            value: _filterNameEquals,
                            onChanged: (bool? value) {
                              setState(() {
                                _filterNameEquals = value ?? false;
                              });
                            },
                          ),
                          Expanded(
                            child: Padding(
                              padding: const EdgeInsets.symmetric(horizontal: 10.0),
                              child: TextField(
                                controller: TextEditingController.fromValue(TextEditingValue(
                                    text: _filterName ?? "",
                                    selection: TextSelection.fromPosition(TextPosition(
                                      affinity: TextAffinity.downstream,
                                      offset: _filterName == null ? 0 : _filterName?.length ?? 0,
                                    )))),
                                onChanged: (v) {
                                  setState(() {
                                    _filterName = v;
                                  });
                                },
                              ),
                            ),
                          ),
                          ElevatedButton(
                            onPressed: () {
                              setState(() {
                                _filterName = "FUN_";
                              });
                            },
                            child: const Text("FUN"),
                          ),
                          const SizedBox(
                            width: 10,
                          ),
                          ElevatedButton(
                            onPressed: () {
                              setState(() {
                                _filterName = "";
                              });
                            },
                            child: const Text("CLEAR"),
                          ),
                        ],
                      ),
                      Row(
                        children: [
                          Expanded(
                            child: Row(
                              children: [
                                const Text("固件"),
                                Checkbox(
                                  value: _filterSofewareEquals,
                                  onChanged: (bool? value) {
                                    setState(() {
                                      _filterSofewareEquals = value ?? false;
                                    });
                                  },
                                ),
                                Expanded(
                                  child: Padding(
                                    padding: const EdgeInsets.symmetric(horizontal: 10.0),
                                    child: TextField(
                                      keyboardType: const TextInputType.numberWithOptions(decimal: true),
                                      onChanged: (v) {
                                        setState(() {
                                          _filterSofeware = v;
                                        });
                                      },
                                    ),
                                  ),
                                ),
                              ],
                            ),
                          ),
                          Expanded(
                            child: Row(
                              children: [
                                const Text("硬件"),
                                Checkbox(
                                  value: _filterHardwareEquals,
                                  onChanged: (bool? value) {
                                    setState(() {
                                      _filterHardwareEquals = value ?? false;
                                    });
                                  },
                                ),
                                Expanded(
                                  child: Padding(
                                    padding: const EdgeInsets.symmetric(horizontal: 10.0),
                                    child: TextField(
                                      keyboardType: const TextInputType.numberWithOptions(decimal: true),
                                      onChanged: (v) {
                                        setState(() {
                                          _filterHardware = v;
                                        });
                                      },
                                    ),
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
                if (scanForDevices == null && items.isEmpty)
                  Padding(
                    padding: const EdgeInsets.all(40.0),
                    child: ElevatedButton(
                      onPressed: () {
                        _search();
                      },
                      child: const Text("搜索设备"),
                    ),
                  ),
                if (scanForDevices == null)
                  Padding(
                    padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 20),
                    child: Column(
                      children: [
                        const Padding(
                          padding:  EdgeInsets.all(16.0),
                          child:  Text("升级设备"),
                        ),
                        Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            ElevatedButton(
                              onPressed: () async {
                                setState(() {
                                  selectedResults.clear();
                                  selectedResults.addAll(items);
                                  _dfuAll = true;
                                });

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

                                String? path = result?.files.single.path ?? "";
                                if (path.isNotEmpty == true) {
                                  _dfu(path, 0);
                                }
                              },
                              child: const Text("模式 1，选取最优"),
                            ),
                            const SizedBox(
                              width: 20,
                            ),
                            ElevatedButton(
                              onPressed: () async {
                                setState(() {
                                  selectedResults.clear();
                                  selectedResults.addAll(items);
                                  _dfuAll = true;
                                });

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

                                String? path = result?.files.single.path ?? "";
                                if (path.isNotEmpty == true) {
                                  _dfu(path, 1);
                                }
                              },
                              child: const Text("模式 2，列表随机"),
                            ),
                          ],
                        ),
                      ],
                    ),
                  ),
                Expanded(
                    child: ListView.builder(
                  itemBuilder: (context, index) {
                    var e = items[index];
                    return GestureDetector(
                      child: Card(
                        child: Padding(
                          padding: const EdgeInsets.all(12.0),
                          child: Row(
                            children: [
                              Expanded(
                                child: Column(
                                  children: [
                                    Text(
                                      e.name,
                                      style: Theme.of(context).textTheme.headline6,
                                    ),
                                    ConstrainedBox(constraints: const BoxConstraints(maxWidth: 140.0), child: Text(e.id)),
                                    Text("${e.manufacturerData}"),
                                    Row(
                                      children: [
                                        Text("${e.rssi} dBm"),
                                        const SizedBox(
                                          width: 20,
                                        ),
                                        Text("#${index + 1}"),
                                      ],
                                    ),
                                  ],
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                ),
                              ),
                              Padding(
                                padding: const EdgeInsets.symmetric(horizontal: 8.0),
                                child: ElevatedButton(
                                  onPressed: () async {
                                    await showDialog(
                                      context: context,
                                      builder: (context) => Find(device: e),
                                    );
                                  },
                                  child: const Text("找鞋"),
                                ),
                              ),
                              if (!_selectAll)
                                ElevatedButton(
                                  onPressed: () {
                                    setState(() {
                                      scanForDevices?.cancel();
                                      scanForDevices = null;
                                    });

                                    Navigator.of(context).push(MaterialPageRoute(builder: (context) {
                                      return Connector(
                                        device: e,
                                      );
                                    }));
                                  },
                                  child: const Text("CONNECT"),
                                ),
                              if (_selectAll)
                                Checkbox(
                                  value: selectedResults.contains(e),
                                  onChanged: (bool? value) {
                                    setState(() {
                                      if (value == true) {
                                        selectedResults.add(e);
                                      } else {
                                        selectedResults.remove(e);
                                      }
                                    });
                                  },
                                ),
                            ],
                          ),
                        ),
                      ),
                    );
                  },
                  itemCount: items.length,
                )),
                if (_selectAll)
                  Padding(
                    padding: const EdgeInsets.all(24.0),
                    child: Row(
                      children: [
                        ElevatedButton(
                          onPressed: () async {
                            scanForDevices?.cancel();
                            clearCache();

                            if (await showDialog(
                                    context: context,
                                    builder: (context) {
                                      return SimpleDialog(
                                        title: const Text("操作确认"),
                                        children: [
                                          if ((_filterHardware?.length ?? 0) == 0)
                                            const Padding(
                                              padding: EdgeInsets.all(20.0),
                                              child: Text("请确保所选设备是同一个硬件版本，排除升级后出现不兼容的情况"),
                                            ),
                                          if ((_filterHardware?.length ?? 0) > 0)
                                            Padding(
                                              padding: const EdgeInsets.all(20.0),
                                              child: Text("升级对应的硬件版本 v${_filterHardware}"),
                                            ),
                                          Padding(
                                            padding: const EdgeInsets.all(20.0),
                                            child: ElevatedButton(
                                              onPressed: () {
                                                Navigator.pop(context, true);
                                              },
                                              child: const Text("知道了"),
                                            ),
                                          ),
                                        ],
                                      );
                                    }) !=
                                true) {
                              return;
                            }

                            if (selectedResults.isEmpty) {
                              ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
                                content: Text('请选择需要升级的设备'),
                              ));
                              return;
                            }

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

                            String? path = result?.files.single.path ?? "";
                            if (path.isNotEmpty == true) {
                              File file = File(path);
                              Navigator.of(context).push(MaterialPageRoute(builder: (context) {
                                return DFUList(
                                  selectedResults: selectedResults,
                                  file: file,
                                );
                              }));
                            } else {
                              // User canceled the picker
                            }
                          },
                          child: Text("批量DFU(${selectedResults.length})"),
                        ),
                        const SizedBox(
                          width: 12,
                        ),
                        ElevatedButton(
                          onPressed: () async {
                            setState(() {
                              selectedResults.clear();
                              selectedResults.addAll(items);
                            });
                          },
                          child: Text("全选"),
                        ),
                        const SizedBox(
                          width: 12,
                        ),
                        ElevatedButton(
                          onPressed: () async {
                            setState(() {
                              selectedResults.clear();
                            });
                          },
                          child: Text("全不选"),
                        ),
                      ],
                    ),
                  ),
              ],
            ),
    );
  }
}