import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:isolate';

import 'package:archive/archive.dart';
import 'package:fl_clash/common/archive.dart';
import 'package:fl_clash/enum/enum.dart';
import 'package:fl_clash/state.dart';
import 'package:flutter/material.dart';
import 'package:path/path.dart';
import 'package:provider/provider.dart';
import 'package:url_launcher/url_launcher.dart';

import 'clash/core.dart';
import 'models/models.dart';
import 'common/common.dart';

class AppController {
  final BuildContext context;
  late AppState appState;
  late AppFlowingState appFlowingState;
  late Config config;
  late ClashConfig clashConfig;
  late Function updateClashConfigDebounce;
  late Function updateGroupDebounce;
  late Function addCheckIpNumDebounce;
  late Function applyProfileDebounce;

  AppController(this.context) {
    appState = context.read<AppState>();
    config = context.read<Config>();
    clashConfig = context.read<ClashConfig>();
    appFlowingState = context.read<AppFlowingState>();
    updateClashConfigDebounce = debounce<Function()>(() async {
      await updateClashConfig();
    });
    applyProfileDebounce = debounce<Function()>(() async {
      await applyProfile(isPrue: true);
    });
    addCheckIpNumDebounce = debounce(() {
      appState.checkIpNum++;
    });
    updateGroupDebounce = debounce(() async {
      await updateGroups();
    });
  }

  updateStatus(bool isStart) async {
    if (isStart) {
      await globalState.handleStart(
        config: config,
        clashConfig: clashConfig,
      );
      updateRunTime();
      updateTraffic();
      globalState.updateFunctionLists = [
        updateRunTime,
        updateTraffic,
      ];
      applyProfileDebounce();
    } else {
      await globalState.handleStop();
      clashCore.resetTraffic();
      appFlowingState.traffics = [];
      appFlowingState.totalTraffic = Traffic();
      appFlowingState.runTime = null;
      addCheckIpNumDebounce();
    }
  }

  updateCoreVersionInfo() {
    globalState.updateCoreVersionInfo(appState);
  }

  updateRunTime() {
    final startTime = globalState.startTime;
    if (startTime != null) {
      final startTimeStamp = startTime.millisecondsSinceEpoch;
      final nowTimeStamp = DateTime.now().millisecondsSinceEpoch;
      appFlowingState.runTime = nowTimeStamp - startTimeStamp;
    } else {
      appFlowingState.runTime = null;
    }
  }

  updateTraffic() {
    globalState.updateTraffic(
      appFlowingState: appFlowingState,
    );
  }

  addProfile(Profile profile) async {
    config.setProfile(profile);
    if (config.currentProfileId != null) return;
    await changeProfile(profile.id);
  }

  deleteProfile(String id) async {
    config.deleteProfileById(id);
    clashCore.clearEffect(id);
    if (config.currentProfileId == id) {
      if (config.profiles.isNotEmpty) {
        final updateId = config.profiles.first.id;
        changeProfile(updateId);
      } else {
        changeProfile(null);
        updateStatus(false);
      }
    }
  }

  Future<void> updateProfile(Profile profile) async {
    final newProfile = await profile.update();
    config.setProfile(
      newProfile.copyWith(isUpdating: false),
    );
  }

  Future<void> updateClashConfig({bool isPatch = true}) async {
    await globalState.updateClashConfig(
      clashConfig: clashConfig,
      config: config,
      isPatch: isPatch,
    );
  }

  Future applyProfile({bool isPrue = false}) async {
    if (isPrue) {
      await globalState.applyProfile(
        appState: appState,
        config: config,
        clashConfig: clashConfig,
      );
    } else {
      final commonScaffoldState = globalState.homeScaffoldKey.currentState;
      if (commonScaffoldState?.mounted != true) return;
      await commonScaffoldState?.loadingRun(() async {
        await globalState.applyProfile(
          appState: appState,
          config: config,
          clashConfig: clashConfig,
        );
      });
    }
    addCheckIpNumDebounce();
  }

  changeProfile(String? value) async {
    if (value == config.currentProfileId) return;
    config.currentProfileId = value;
  }

  autoUpdateProfiles() async {
    for (final profile in config.profiles) {
      if (!profile.autoUpdate) continue;
      final isNotNeedUpdate = profile.lastUpdateDate
          ?.add(
            profile.autoUpdateDuration,
          )
          .isBeforeNow;
      if (isNotNeedUpdate == false || profile.type == ProfileType.file) {
        continue;
      }
      try {
        updateProfile(profile);
      } catch (e) {
        appFlowingState.addLog(
          Log(
            logLevel: LogLevel.info,
            payload: e.toString(),
          ),
        );
      }
    }
  }

  updateProfiles() async {
    for (final profile in config.profiles) {
      if (profile.type == ProfileType.file) {
        continue;
      }
      await updateProfile(profile);
    }
  }

  Future<void> updateGroups() async {
    await globalState.updateGroups(appState);
  }

  updateSystemColorSchemes(SystemColorSchemes systemColorSchemes) {
    appState.systemColorSchemes = systemColorSchemes;
  }

  savePreferences() async {
    await saveConfigPreferences();
    await saveClashConfigPreferences();
  }

  saveConfigPreferences() async {
    debugPrint("saveConfigPreferences");
    await preferences.saveConfig(config);
  }

  saveClashConfigPreferences() async {
    debugPrint("saveClashConfigPreferences");
    await preferences.saveClashConfig(clashConfig);
  }

  changeProxy({
    required String groupName,
    required String proxyName,
  }) {
    globalState.changeProxy(
      config: config,
      groupName: groupName,
      proxyName: proxyName,
    );
    addCheckIpNumDebounce();
  }

  handleBackOrExit() async {
    if (config.isMinimizeOnExit) {
      if (system.isDesktop) {
        await savePreferences();
      }
      await system.back();
    } else {
      await handleExit();
    }
  }

  handleExit() async {
    await updateStatus(false);
    await proxy?.stopProxy();
    await savePreferences();
    clashCore.shutdown();
    system.exit();
  }

  updateLogStatus() {
    if (config.openLogs) {
      clashCore.startLog();
    } else {
      clashCore.stopLog();
      appFlowingState.logs = [];
    }
  }

  autoCheckUpdate() async {
    if (!config.autoCheckUpdate) return;
    final res = await request.checkForUpdate();
    checkUpdateResultHandle(data: res);
  }

  checkUpdateResultHandle({
    Map<String, dynamic>? data,
    bool handleError = false,
  }) async {
    if (data != null) {
      final tagName = data['tag_name'];
      final body = data['body'];
      final submits = other.parseReleaseBody(body);
      final textTheme = context.textTheme;
      globalState.showMessage(
        title: appLocalizations.discoverNewVersion,
        message: TextSpan(
          text: "$tagName \n",
          style: textTheme.headlineSmall,
          children: [
            TextSpan(
              text: "\n",
              style: textTheme.bodyMedium,
            ),
            for (final submit in submits)
              TextSpan(
                text: "- $submit \n",
                style: textTheme.bodyMedium,
              ),
          ],
        ),
        onTab: () {
          launchUrl(
            Uri.parse("https://github.com/$repository/releases/latest"),
          );
        },
        confirmText: appLocalizations.goDownload,
      );
    } else if (handleError) {
      globalState.showMessage(
        title: appLocalizations.checkUpdate,
        message: TextSpan(
          text: appLocalizations.checkUpdateError,
        ),
      );
    }
  }

  init() async {
    final isDisclaimerAccepted = await handlerDisclaimer();
    if (!isDisclaimerAccepted) {
      system.exit();
    }
    updateLogStatus();
    if (!config.silentLaunch) {
      window?.show();
    }
    if (Platform.isAndroid) {
      globalState.updateStartTime();
    }
    if (globalState.isStart) {
      await updateStatus(true);
    } else {
      await updateStatus(config.autoRun);
    }
    autoUpdateProfiles();
    autoCheckUpdate();
  }

  setDelay(Delay delay) {
    appState.setDelay(delay);
  }

  toPage(int index, {bool hasAnimate = false}) {
    if (index > appState.currentNavigationItems.length - 1) {
      return;
    }
    appState.currentLabel = appState.currentNavigationItems[index].label;
    if ((config.isAnimateToPage || hasAnimate)) {
      globalState.pageController?.animateToPage(
        index,
        duration: kTabScrollDuration,
        curve: Curves.easeOut,
      );
    } else {
      globalState.pageController?.jumpToPage(index);
    }
  }

  toProfiles() {
    final index = appState.currentNavigationItems.indexWhere(
      (element) => element.label == "profiles",
    );
    if (index != -1) {
      toPage(index);
    }
  }

  initLink() {
    linkManager.initAppLinksListen(
      (url) {
        globalState.showMessage(
          title: "${appLocalizations.add}${appLocalizations.profile}",
          message: TextSpan(
            children: [
              TextSpan(text: appLocalizations.doYouWantToPass),
              TextSpan(
                text: " $url ",
                style: TextStyle(
                  color: Theme.of(context).colorScheme.primary,
                  decoration: TextDecoration.underline,
                  decorationColor: Theme.of(context).colorScheme.primary,
                ),
              ),
              TextSpan(
                  text:
                      "${appLocalizations.create}${appLocalizations.profile}"),
            ],
          ),
          onTab: () {
            addProfileFormURL(url);
          },
        );
      },
    );
  }

  showSnackBar(String message) {
    globalState.showSnackBar(context, message: message);
  }

  Future<bool> showDisclaimer() async {
    return await globalState.showCommonDialog<bool>(
          dismissible: false,
          child: AlertDialog(
            title: Text(appLocalizations.disclaimer),
            content: Container(
              width: dialogCommonWidth,
              constraints: const BoxConstraints(maxHeight: 200),
              child: SingleChildScrollView(
                child: SelectableText(
                  appLocalizations.disclaimerDesc,
                ),
              ),
            ),
            actions: [
              TextButton(
                onPressed: () {
                  Navigator.of(context).pop<bool>(false);
                },
                child: Text(appLocalizations.exit),
              ),
              TextButton(
                onPressed: () {
                  config.isDisclaimerAccepted = true;
                  Navigator.of(context).pop<bool>(true);
                },
                child: Text(appLocalizations.agree),
              )
            ],
          ),
        ) ??
        false;
  }

  Future<bool> handlerDisclaimer() async {
    if (config.isDisclaimerAccepted) {
      return true;
    }
    return showDisclaimer();
  }

  addProfileFormURL(String url) async {
    if (globalState.navigatorKey.currentState?.canPop() ?? false) {
      globalState.navigatorKey.currentState?.popUntil((route) => route.isFirst);
    }
    toProfiles();
    final commonScaffoldState = globalState.homeScaffoldKey.currentState;
    if (commonScaffoldState?.mounted != true) return;
    final profile = await commonScaffoldState?.loadingRun<Profile>(
      () async {
        return await Profile.normal(
          url: url,
        ).update();
      },
      title: "${appLocalizations.add}${appLocalizations.profile}",
    );
    if (profile != null) {
      await addProfile(profile);
    }
  }

  addProfileFormFile() async {
    final platformFile = await globalState.safeRun(picker.pickerFile);
    final bytes = platformFile?.bytes;
    if (bytes == null) {
      return null;
    }
    if (!context.mounted) return;
    globalState.navigatorKey.currentState?.popUntil((route) => route.isFirst);
    toProfiles();
    final commonScaffoldState = globalState.homeScaffoldKey.currentState;
    if (commonScaffoldState?.mounted != true) return;
    final profile = await commonScaffoldState?.loadingRun<Profile?>(
      () async {
        await Future.delayed(const Duration(milliseconds: 300));
        return await Profile.normal(label: platformFile?.name).saveFile(bytes);
      },
      title: "${appLocalizations.add}${appLocalizations.profile}",
    );
    if (profile != null) {
      await addProfile(profile);
    }
  }

  addProfileFormQrCode() async {
    final url = await globalState.safeRun(picker.pickerConfigQRCode);
    if (url == null) return;
    addProfileFormURL(url);
  }

  updateViewWidth(double width) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      appState.viewWidth = width;
    });
  }

  List<Proxy> _sortOfName(List<Proxy> proxies) {
    return List.of(proxies)
      ..sort(
        (a, b) => other.sortByChar(
          other.getPinyin(a.name),
          other.getPinyin(b.name),
        ),
      );
  }

  List<Proxy> _sortOfDelay(List<Proxy> proxies) {
    return proxies = List.of(proxies)
      ..sort(
        (a, b) {
          final aDelay = appState.getDelay(a.name);
          final bDelay = appState.getDelay(b.name);
          if (aDelay == null && bDelay == null) {
            return 0;
          }
          if (aDelay == null || aDelay == -1) {
            return 1;
          }
          if (bDelay == null || bDelay == -1) {
            return -1;
          }
          return aDelay.compareTo(bDelay);
        },
      );
  }

  List<Proxy> getSortProxies(List<Proxy> proxies) {
    return switch (config.proxiesSortType) {
      ProxiesSortType.none => proxies,
      ProxiesSortType.delay => _sortOfDelay(proxies),
      ProxiesSortType.name => _sortOfName(proxies),
    };
  }

  String getCurrentSelectedName(String groupName) {
    final group = appState.getGroupWithName(groupName);
    return group?.getCurrentSelectedName(
            config.currentSelectedMap[groupName] ?? '') ??
        '';
  }

  Future<List<int>> backupData() async {
    final homeDirPath = await appPath.getHomeDirPath();
    final profilesPath = await appPath.getProfilesPath();
    final configJson = config.toJson();
    final clashConfigJson = clashConfig.toJson();
    return Isolate.run<List<int>>(() async {
      final archive = Archive();
      archive.add("config.json", configJson);
      archive.add("clashConfig.json", clashConfigJson);
      await archive.addDirectoryToArchive(profilesPath, homeDirPath);
      final zipEncoder = ZipEncoder();
      return zipEncoder.encode(archive) ?? [];
    });
  }

  updateTun() {
    clashConfig.tun = clashConfig.tun.copyWith(
      enable: !clashConfig.tun.enable,
    );
  }

  updateSystemProxy() {
    config.desktopProps = config.desktopProps.copyWith(
      systemProxy: !config.desktopProps.systemProxy,
    );
  }

  updateStart() {
    updateStatus(!appFlowingState.isStart);
  }

  updateAutoLaunch() {
    config.autoLaunch = !config.autoLaunch;
  }

  updateVisible() async {
    final visible = await window?.isVisible();
    if (visible != null && !visible) {
      window?.show();
    } else {
      window?.hide();
    }
  }

  updateMode() {
    final index = Mode.values.indexWhere((item) => item == clashConfig.mode);
    if (index == -1) {
      return;
    }
    final nextIndex = index + 1 > Mode.values.length - 1 ? 0 : index + 1;
    clashConfig.mode = Mode.values[nextIndex];
  }

  recoveryData(
    List<int> data,
    RecoveryOption recoveryOption,
  ) async {
    final archive = await Isolate.run<Archive>(() {
      final zipDecoder = ZipDecoder();
      return zipDecoder.decodeBytes(data);
    });
    final homeDirPath = await appPath.getHomeDirPath();
    final configs =
        archive.files.where((item) => item.name.endsWith(".json")).toList();
    final profiles =
        archive.files.where((item) => !item.name.endsWith(".json"));
    final configIndex =
        configs.indexWhere((config) => config.name == "config.json");
    final clashConfigIndex =
        configs.indexWhere((config) => config.name == "clashConfig.json");
    if (configIndex == -1 || clashConfigIndex == -1) throw "invalid backup.zip";
    final configFile = configs[configIndex];
    final clashConfigFile = configs[clashConfigIndex];
    final tempConfig = Config.fromJson(
      json.decode(
        utf8.decode(configFile.content),
      ),
    );
    final tempClashConfig = ClashConfig.fromJson(
      json.decode(
        utf8.decode(clashConfigFile.content),
      ),
    );
    for (final profile in profiles) {
      final filePath = join(homeDirPath, profile.name);
      final file = File(filePath);
      await file.create(recursive: true);
      await file.writeAsBytes(profile.content);
    }
    if (recoveryOption == RecoveryOption.onlyProfiles) {
      config.update(tempConfig, RecoveryOption.onlyProfiles);
    } else {
      config.update(tempConfig, RecoveryOption.all);
      clashConfig.update(tempClashConfig);
    }
  }
}