import 'dart:async';
import 'dart:convert';
import 'dart:ffi' as ffi;
import 'dart:io';
import 'dart:isolate';
import 'package:dio/dio.dart';
import 'package:naiyouwl/main.dart';
import 'package:dart_json_mapper/dart_json_mapper.dart';
import 'package:ffi/ffi.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:path/path.dart';
import 'package:path/path.dart' as p;
import 'package:get/get.dart';
import 'package:kommon/request/request.dart';
import 'package:kommon/tool/sp_util.dart';
import 'package:naiyouwl/clash_generated_bindings.dart';
import 'package:path_provider/path_provider.dart';
import 'package:proxy_manager/proxy_manager.dart';
import 'package:tray_manager/tray_manager.dart';
import '../bean/clash_config_entity.dart';
import '../data/model/NodeMode.dart';
late NativeLibrary clashFFI;

//android 或者ios
//const mobileChannel = MethodChannel("xxxPlugin");

class ClashService extends GetxService with TrayListener {
  // 需要一起改端口
  static const clashBaseUrl = "http://127.0.0.1:$clashExtPort";
  static const clashExtPort = 22346;

  // 运行时
  late Directory _clashDirectory;
  RandomAccessFile? _clashLock;

  // 流量
  final uploadRate = 0.0.obs;
  final downRate = 0.0.obs;
  final yamlConfigs = RxSet<FileSystemEntity>();
  final currentYaml = 'config.yaml'.obs;
  final proxyStatus = RxMap<String, int>();
  final proxyYamlCurrent = "".obs;
  final proxyYaml = 'proxy.yaml'.obs;


  // action
  static const ACTION_SET_SYSTEM_PROXY = "assr";
  static const ACTION_UNSET_SYSTEM_PROXY = "ausr";
  static const MAX_ENTRIES = 5;

  // default port
  static var initializedHttpPort = 0;
  static var initializedSockPort = 0;
  static var initializedMixedPort = 0;

  // config
  Rx<ClashConfigEntity?> configEntity = Rx(null);

  // log
  Stream<dynamic>? logStream;
  RxMap<String, dynamic> proxies = RxMap();
  RxBool isSystemProxyObs = RxBool(false);



  ClashService() {
    // load lib
    var fullPath = "";
    if (Platform.isWindows) {
      fullPath = "libclash.dll";
    } else if (Platform.isMacOS) {
      fullPath = "libclash.dylib";
    } else {
      fullPath = "libclash.so";
    }
    final lib = ffi.DynamicLibrary.open(fullPath);
    clashFFI = NativeLibrary(lib);
    clashFFI.init_native_api_bridge(ffi.NativeApi.initializeApiDLData);
  }

  Future<ClashService> init() async {
    _clashDirectory = await getApplicationSupportDirectory();

    final _ = SpUtil.getData('yaml', defValue: currentYaml.value);
    initializedHttpPort = SpUtil.getData('http-port', defValue: 7899);
    initializedSockPort = SpUtil.getData('socks-port', defValue: 7877);
    initializedMixedPort = SpUtil.getData('mixed-port', defValue: 7811);
    currentYaml.value = _;
    Request.setBaseUrl(clashBaseUrl);
    final clashConfigPath = p.join(_clashDirectory.path, "clash");
    _clashDirectory = Directory(clashConfigPath);
    if (kDebugMode) {
      print("fclash work directory: ${_clashDirectory.path}");
    }
    final clashConf = p.join(_clashDirectory.path, currentYaml.value);
    final countryMMdb = p.join(_clashDirectory.path, 'Country.mmdb');
    if (!await _clashDirectory.exists()) {
      await _clashDirectory.create(recursive: true);
    }
    // copy executable to directory
    final mmdb = await rootBundle.load('assets/tp/clash/Country.mmdb');
    // write to clash dir
    final mmdbF = File(countryMMdb);
    if (!mmdbF.existsSync()) {
      await mmdbF.writeAsBytes(mmdb.buffer.asInt8List());
    }
    final countryGeoIP= p.join(_clashDirectory.path, 'geoip.dat');

    final geoip = await rootBundle.load('assets/tp/clash/geoip.dat');
    // write to clash dir
    final geoipF = File(countryGeoIP);
    if (!geoipF.existsSync()) {
      await geoipF.writeAsBytes(geoip.buffer.asInt8List());
    }
    final countryGeoSite= p.join(_clashDirectory.path, 'geosite.dat');

    final geoSite = await rootBundle.load('assets/tp/clash/geoip.dat');
    // write to clash dir
    final geoSiteF = File(countryGeoSite);
    if (!geoSiteF.existsSync()) {
      await geoSiteF.writeAsBytes(geoSite.buffer.asInt8List());
    }

    final config = await rootBundle.load('assets/tp/clash/config.yaml');
    // write to clash dir
    final configF = File(clashConf);
    if (!configF.existsSync()) {
      await configF.writeAsBytes(config.buffer.asInt8List());
    }
    // create or detect lock file
    await _acquireLock(_clashDirectory);
    // ffi
    clashFFI.set_home_dir(_clashDirectory.path.toNativeUtf8().cast());
    clashFFI.clash_init(_clashDirectory.path.toNativeUtf8().cast());
    clashFFI.set_config(clashConf.toNativeUtf8().cast());
    clashFFI.set_ext_controller(clashExtPort);
    if (clashFFI.parse_options() == 0) {
      Get.printInfo(info: "parse ok");
    }
    Future.delayed(Duration.zero, () {
     initDaemon();
    });
    // tray show issue
    if (isDesktop) {
      trayManager.addListener(this);
    }
    // wait getx initialize
    // Future.delayed(const Duration(seconds: 3), () {
    //   if (!Platform.isWindows) {
    //     Get.find<NotificationService>()
    //         .showNotification("Fclash", "Is running".tr);
    //   }
    // });
    return this;
  }

  void getConfigs() {
    yamlConfigs.clear();
    final entities = _clashDirectory.listSync();
    for (final entity in entities) {
      if (entity.path.toLowerCase().endsWith('.yaml') &&
          !yamlConfigs.contains(entity)) {
        yamlConfigs.add(entity);
        Get.printInfo(info: 'detected: ${entity.path}');
      }
    }
  }

  Map<String, dynamic> getConnections() {
    final connsPtr = clashFFI.get_all_connections().cast<Utf8>();
    String connections = connsPtr.toDartString();
    // malloc.free(connsPtr);
    return json.decode(connections);
  }

  void closeAllConnections() {
    clashFFI.close_all_connections();
  }

  bool closeConnection(String connectionId) {
    final id = connectionId.toNativeUtf8().cast<ffi.Char>();
    return clashFFI.close_connection(id) == 1;
  }

  void getCurrentClashConfig() {
    final configPtr = clashFFI.get_configs().cast<Utf8>();
    final jsondata = json.decode(configPtr.toDartString());
    final data =  JsonMapper.deserialize<ClashConfigEntity>(jsondata);
    configEntity.value = data;
    // malloc.free(configPtr);
  }

  Future<void> chageProxyConfig() async {
    final clashConf = p.join(_clashDirectory.path, proxyYaml.value);
    final f = File(clashConf);
    if (f.existsSync() && await changeYaml(f)) {
      // set subscription
      // await SpUtil.setData('profile_$name', url);
     // await reload();
    }

  }
  String generateRules() {
    return '''
rules:
  - GEOSITE,cn,DIRECT
  - GEOIP,CN,DIRECT
  - MATCH,proxy
  ''';
  }

  Future<void> makeClash(List<NodeMode> nodeModes) async {
    var proxies = nodeModes.map(nodeToYaml).toList();

    var config = '''
port: 7891
socks-port: 7890
redir-port: 7893
allow-lan: true
mode: rule
log-level: info
ipv6: false
unified-delay: false
geodata-mode: true
tcp-concurrent: false
find-process-mode: strict
global-client-fingerprint: chrome
external-controller: 0.0.0.0:9090
proxies:
\n${proxies.join('\n')}
proxy-groups:
  - name: proxy
    type: select
    proxies: 
      ${nodeModes.map((node) => '- ${node.name}').join('\n      ')}
${generateRules()}
  ''';
    proxyYamlCurrent.value = config;
    final clashConf = p.join(_clashDirectory.path, proxyYaml.value);
    final configF = File(clashConf);
    await configF.writeAsBytes(utf8.encode(config));
  }



  String nodeToYaml(NodeMode node) {
    const prefix = '  '; // 两个空格的缩进
    switch (node.type) {
      case 'trojan':
        return '''$prefix- { name: ${node.name}, type: ${node.type}, server: ${node.host}, port: ${node.port}, password: ${node.passwd}, udp: 1 }''';
      case 'shadowsocks':
        return '''$prefix- { name: ${node.name}, type: ss, server: ${node.host}, port: ${node.port}, password: ${node.passwd}, cipher: ${node.method}, udp: 1 }''';
      case 'v2ray':
        final type = (node.vless == 1) ? 'vless' : 'vmess';
        if (type == 'vless') {
          return '''$prefix- { name: ${node.name}, type: $type, server: ${node.host}, port: ${node.port}, uuid: ${node.uuid}, alterId: ${node.v2AlterId}, udp: 1, flow: xtls-rprx-vision, servername: www.amazon.com, tls: true, reality-opts: { public-key: ${node.vlessPulkey} } }''';
        } else {
          return '''$prefix- { name: ${node.name}, type: $type, server: ${node.host}, port: ${node.port}, uuid: ${node.uuid}, alterId: ${node.v2AlterId}, cipher: ${node.method}, udp: 1 }''';
        }
      default:
        return '';
    }
  }

  Future<void> reload() async {
    // get configs
    getConfigs();
    getCurrentClashConfig();
    // proxies
    getProxies();
    updateTray();
  }
  void initDaemon() async {
    printInfo(info: 'init clash service');
    // wait for online
    // while (!await isRunning()) {
    //   printInfo(info: 'waiting online status');
    //   await Future.delayed(const Duration(milliseconds: 500));
    // }
    // get traffic
    // Timer.periodic(const Duration(seconds: 1), (t) {
    //   final trafficPtr = clashFFI.get_traffic().cast<Utf8>();
    //   final traffic = trafficPtr.toDartString();
    //   if (kDebugMode) {
    //     debugPrint(traffic);
    //   }
    //   try {
    //     final trafficJson = jsonDecode(traffic);
    //     uploadRate.value = trafficJson['Up'].toDouble() / 1024; // KB
    //     downRate.value = trafficJson['Down'].toDouble() / 1024; // KB
    //     // fix: 只有KDE不会导致Tray自动消失
    //     // final desktop = Platform.environment['XDG_CURRENT_DESKTOP'];
    //     // updateTray();
    //   } catch (e) {
    //     Get.printError(info: '$e');
    //   }
    //   // malloc.free(trafficPtr);
    // });
    // // system proxy
    // // listen port
    await reload();
    // checkPort();
    // if (isSystemProxy()) {
    //   setSystemProxy();
    // }
  }

  @override
  void onClose() {
    closeClashDaemon();
    super.onClose();
  }

  Future<void> closeClashDaemon() async {
    Get.printInfo(info: 'fclash: closing daemon');
    // double check
    // stopClashSubP();
    if (isSystemProxy()) {
      // just clear system proxy
      await clearSystemProxy(permanent: false);
    }
    await _clashLock?.unlock();
  }
  Future<void> setSystemProxy() async {
    if (isDesktop) {
      if (configEntity.value != null) {
        final entity = configEntity.value!;
        if (entity.port != 0) {
          await Future.wait([
            proxyManager.setAsSystemProxy(
                ProxyTypes.http, '127.0.0.1', entity.port!),
            proxyManager.setAsSystemProxy(
                ProxyTypes.https, '127.0.0.1', entity.port!)
          ]);
          debugPrint("set http");
        }
        if (entity.socksPort != 0 && !Platform.isWindows) {
          debugPrint("set socks");
          await proxyManager.setAsSystemProxy(
              ProxyTypes.socks, '127.0.0.1', entity.socksPort!);
        }
        await setIsSystemProxy(true);
      }
    } else {
      if (configEntity.value != null) {
        final entity = configEntity.value!;
        if (entity.port != 0) {
          // await mobileChannel
          //     .invokeMethod("SetHttpPort", {"port": entity.port});
        }
       // mobileChannel.invokeMethod("StartProxy");
        await setIsSystemProxy(true);
      }

      // await Clipboard.setData(
      //     ClipboardData(text: "${configEntity.value?.port}"));
      // final dialog = BrnDialog(
      //   titleText: "请手动设置代理",
      //   messageText:
      //       "端口号已复制。请进入已连接WiFi的详情设置，将代理设置为手动，主机名填写127.0.0.1，端口填写${configEntity.value?.port}，然后返回点击已完成即可",
      //   actionsText: ["取消", "已完成", "去设置填写"],
      //   indexedActionCallback: (index) async {
      //     if (index == 0) {
      //       if (Get.isOverlaysOpen) {
      //         Get.back();
      //       }
      //     } else if (index == 1) {
      //       final proxy = await SystemProxy.getProxySettings();
      //       if (proxy != null) {
      //         if (proxy["host"] == "127.0.0.1" &&
      //             int.parse(proxy["port"].toString()) ==
      //                 configEntity.value?.port) {
      //           Future.delayed(Duration.zero, () {
      //             if (Get.overlayContext != null) {
      //               BrnToast.show("设置成功", Get.overlayContext!);
      //               setIsSystemProxy(true);
      //             }
      //           });
      //           if (Get.isOverlaysOpen) {
      //             Get.back();
      //           }
      //         }
      //       } else {
      //         Future.delayed(Duration.zero, () {
      //           if (Get.overlayContext != null) {
      //             BrnToast.show("好像未完成设置哦", Get.overlayContext!);
      //           }
      //         });
      //       }
      //     } else {
      //       Future.delayed(Duration.zero, () {
      //         BrnToast.show("端口号已复制", Get.context!);
      //       });
      //       await OpenSettings.openWIFISetting();
      //     }
      //   },
      // );
      // Get.dialog(dialog);
    }
  }

  Future<void> clearSystemProxy({bool permanent = true}) async {
    if (isDesktop) {
      await proxyManager.cleanSystemProxy();
      if (permanent) {
        await setIsSystemProxy(false);
      }
    } else {
      //mobileChannel.invokeMethod("StopProxy");
      await setIsSystemProxy(false);
      // final dialog = BrnDialog(
      //   titleText: "请手动设置代理",
      //   messageText: "请进入已连接WiFi的详情设置，将代理设置为无",
      //   actionsText: ["取消", "已完成", "去设置清除"],
      //   indexedActionCallback: (index) async {
      //     if (index == 0) {
      //       if (Get.isOverlaysOpen) {
      //         Get.back();
      //       }
      //     } else if (index == 1) {
      //       final proxy = await SystemProxy.getProxySettings();
      //       if (proxy != null) {
      //         Future.delayed(Duration.zero, () {
      //           if (Get.overlayContext != null) {
      //             BrnToast.show("好像没有清除成功哦，当前代理${proxy}", Get.overlayContext!);
      //           }
      //         });
      //       } else {
      //         Future.delayed(Duration.zero, () {
      //           if (Get.overlayContext != null) {
      //             BrnToast.show("清除成功", Get.overlayContext!);
      //           }
      //           setIsSystemProxy(false);
      //           if (Get.isOverlaysOpen) {
      //             Get.back();
      //           }
      //         });
      //       }
      //     } else {
      //       OpenSettings.openWIFISetting().then((_) async {
      //         final proxy = await SystemProxy.getProxySettings();
      //         debugPrint("$proxy");
      //       });
      //     }
      //   },
      // );
      // Get.dialog(dialog);
    }
  }
  void getProxies() {
    final proxiesPtr = clashFFI.get_proxies().cast<Utf8>();
    proxies.value = json.decode(proxiesPtr.toDartString());

  }

  bool isSystemProxy() {
    return SpUtil.getData('system_proxy', defValue: false);
  }

  Future<bool> setIsSystemProxy(bool proxy) {
    isSystemProxyObs.value = proxy;
    return SpUtil.setData('system_proxy', proxy);
  }



  void checkPort() {
    if (configEntity.value != null) {
      if (configEntity.value!.port == 0) {
        changeConfigField('port', initializedHttpPort);
      }
      if (configEntity.value!.mixedPort == 0) {
        changeConfigField('mixed-port', initializedMixedPort);
      }
      if (configEntity.value!.socksPort == 0) {
        changeConfigField('socks-port', initializedSockPort);
      }
      updateTray();
    }
  }
  //切换配置
  bool changeConfigField(String field, dynamic value) {
    try {
      int ret = clashFFI.change_config_field(
          json.encode(<String, dynamic>{field: value}).toNativeUtf8().cast());
      return ret == 0;
    } finally {
      getCurrentClashConfig();
      if (field.endsWith("port") && isSystemProxy()) {
        setSystemProxy();
      }
    }
  }

  Future<void> _acquireLock(Directory clashDirectory) async {
    final path = p.join(clashDirectory.path, "fclash.lock");
    final lockFile = File(path);
    if (!lockFile.existsSync()) {
      lockFile.createSync(recursive: true);
    }
    try {
      _clashLock = await lockFile.open(mode: FileMode.write);
      await _clashLock?.lock();
    } catch (e) {
      // if (!Platform.isWindows) {
      //   await Get.find<NotificationService>()
      //       .showNotification("Fclash", "Already running, Now exit.".tr);
      // }
      exit(0);
    }
  }
  ReceivePort? _logReceivePort;

  void startLogging() {
    _logReceivePort?.close();
    _logReceivePort = ReceivePort();
    logStream = _logReceivePort!.asBroadcastStream();
    if (kDebugMode) {
      logStream?.listen((event) {
        debugPrint("LOG: ${event}");
      });
    }
    final nativePort = _logReceivePort!.sendPort.nativePort;
    debugPrint("port: $nativePort");
    clashFFI.start_log(nativePort);
  }
  void stopLog() {
    logStream = null;
    clashFFI.stop_log();
  }
  void updateTray() {
    if (!isDesktop) {
      return;
    }
    final stringList = List<MenuItem>.empty(growable: true);
    // yaml
    stringList
        .add(MenuItem(label: "profile: ${currentYaml.value}", disabled: true));
    if (proxies['proxies'] != null) {
      Map<String, dynamic> m = proxies['proxies'];
      m.removeWhere((key, value) => value['type'] != "Selector");
      var cnt = 0;
      for (final k in m.keys) {
        if (cnt >= ClashService.MAX_ENTRIES) {
          stringList.add(MenuItem(label: "...", disabled: true));
          break;
        }
        stringList.add(
            MenuItem(label: "${m[k]['name']}: ${m[k]['now']}", disabled: true));
        cnt += 1;
      }
    }
    // port
    if (configEntity.value != null) {
      stringList.add(
          MenuItem(label: 'http: ${configEntity.value?.port}', disabled: true));
      stringList.add(MenuItem(
          label: 'socks: ${configEntity.value?.socksPort}', disabled: true));
    }
    // system proxy
    stringList.add(MenuItem.separator());
    if (!isSystemProxy()) {
      stringList
          .add(MenuItem(label: "Not system proxy yet.".tr, disabled: true));
      stringList.add(MenuItem(
          label: "Set as system proxy".tr,
          toolTip: "click to set fclash as system proxy".tr,
          key: ACTION_SET_SYSTEM_PROXY));
    } else {
      stringList.add(MenuItem(label: "System proxy now.".tr, disabled: true));
      stringList.add(MenuItem(
          label: "Unset system proxy".tr,
          toolTip: "click to reset system proxy",
          key: ACTION_UNSET_SYSTEM_PROXY));
      stringList.add(MenuItem.separator());
    }

    initAppTray(details: stringList, isUpdate: true);
  }

  Future<bool> _changeConfig(FileSystemEntity config) async {
    // check if it has `rule-set`, and try to convert it
    final content = await convertConfig(await File(config.path).readAsString())
        .catchError((e) {
      printError(info: e);
    });
    if (content.isNotEmpty) {
      await File(config.path).writeAsString(content);
    }
    // judge valid
    if (clashFFI.is_config_valid(config.path.toNativeUtf8().cast()) == 0) {
      final resp = await Request.dioClient.put('/configs',
          queryParameters: {"force": false}, data: {"path": config.path});
      Get.printInfo(info: 'config changed ret: ${resp.statusCode}');
      currentYaml.value = basename(config.path);
      SpUtil.setData('yaml', currentYaml.value);
      return resp.statusCode == 204;
    } else {
      Future.delayed(Duration.zero, () {
        Get.defaultDialog(
            middleText: 'not a valid config file'.tr,
            onConfirm: () {
              Get.back();
            });
      });
      config.delete();
      return false;
    }
  }
  Future<bool> addProfile(String name, String url) async {
    final configName = '$name.yaml';
    final newProfilePath = join(_clashDirectory.path, configName);
    try {
      final uri = Uri.tryParse(url);
      if (uri == null) {
        return false;
      }
      final resp = await Dio(BaseOptions(
          headers: {'User-Agent': 'clash.meta'},
          sendTimeout: 15000,
          receiveTimeout: 15000))
          .downloadUri(uri, newProfilePath, onReceiveProgress: (i, t) {
        Get.printInfo(info: "$i/$t");
      });
      return resp.statusCode == 200;
    } catch (e) {
      //BrnToast.show("Error: ${e}", Get.context!);
    } finally {
      final f = File(newProfilePath);
      if (f.existsSync() && await changeYaml(f)) {
        // set subscription
        await SpUtil.setData('profile_$name', url);
        return true;
      }
      return false;
    }
  }

  Future<bool> deleteProfile(FileSystemEntity config) async {
    if (config.existsSync()) {
      config.deleteSync();
      await SpUtil.remove('profile_${basename(config.path)}');
      reload();
      return true;
    } else {
      return false;
    }
  }
  //切换配置文件
  Future<bool> changeYaml(FileSystemEntity config) async {
    try {
      if (await config.exists()) {
        return await _changeConfig(config);
      } else {
        return false;
      }
    } finally {
      reload();
    }
  }

  bool changeProxy(String selectName, String proxyName) {
    final ret = clashFFI.change_proxy(
        selectName.toNativeUtf8().cast(), proxyName.toNativeUtf8().cast());
    if (ret == 0) {
      reload();
    }
    return ret == 0;
  }

  bool isHideWindowWhenStart() {
    return SpUtil.getData('boot_window_hide', defValue: false);
  }

  void handleSignal() {
    StreamSubscription? subTerm;
    subTerm = ProcessSignal.sigterm.watch().listen((event) {
      subTerm?.cancel();
      // _clashProcess?.kill();
    });
  }

}

Future<String> convertConfig(String content) async {
  return "";
}