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

import 'package:basic_utils/basic_utils.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:dio/dio.dart';
import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/foundation.dart';
import 'package:hive/hive.dart';
import 'package:pub_semver/pub_semver.dart';
import 'package:selfprivacy/config/get_it_config.dart';
import 'package:selfprivacy/config/hive_config.dart';
import 'package:selfprivacy/logic/models/json/dns_records.dart';
import 'package:selfprivacy/logic/providers/provider_settings.dart';
import 'package:selfprivacy/logic/api_maps/graphql_maps/server_api/server_api.dart';
import 'package:selfprivacy/logic/api_maps/staging_options.dart';
import 'package:selfprivacy/logic/cubit/server_installation/server_installation_cubit.dart';
import 'package:selfprivacy/logic/models/hive/backblaze_credential.dart';
import 'package:selfprivacy/logic/models/hive/server_details.dart';
import 'package:selfprivacy/logic/models/hive/server_domain.dart';
import 'package:selfprivacy/logic/models/hive/user.dart';
import 'package:selfprivacy/logic/models/json/device_token.dart';
import 'package:selfprivacy/logic/models/message.dart';
import 'package:selfprivacy/logic/models/server_basic_info.dart';
import 'package:selfprivacy/logic/models/server_type.dart';
import 'package:selfprivacy/logic/providers/providers_controller.dart';
import 'package:selfprivacy/ui/helpers/modals.dart';
import 'package:selfprivacy/utils/network_utils.dart';

class IpNotFoundException implements Exception {
  IpNotFoundException(this.message);
  final String message;
}

class ServerAuthorizationException implements Exception {
  ServerAuthorizationException(this.message);
  final String message;
}

class ServerInstallationRepository {
  Box box = Hive.box(BNames.serverInstallationBox);
  Box<User> usersBox = Hive.box(BNames.usersBox);

  Future<ServerInstallationState> load() async {
    final String? providerApiToken = getIt<ApiConfigModel>().serverProviderKey;
    final String? location = getIt<ApiConfigModel>().serverLocation;
    final String? dnsApiToken = getIt<ApiConfigModel>().dnsProviderKey;
    final String? serverTypeIdentificator = getIt<ApiConfigModel>().serverType;
    final ServerDomain? serverDomain = getIt<ApiConfigModel>().serverDomain;
    final DnsProviderType? dnsProvider = getIt<ApiConfigModel>().dnsProvider;
    final ServerProviderType? serverProvider =
        getIt<ApiConfigModel>().serverProvider;
    final BackblazeCredential? backblazeCredential =
        getIt<ApiConfigModel>().backblazeCredential;
    final ServerHostingDetails? serverDetails =
        getIt<ApiConfigModel>().serverDetails;

    if (serverProvider != null ||
        (serverDetails != null &&
            serverDetails.provider != ServerProviderType.unknown)) {
      ProvidersController.initServerProvider(
        ServerProviderSettings(
          provider: serverProvider ?? serverDetails!.provider,
          location: location,
        ),
      );
    }

    if (dnsProvider != null ||
        (serverDomain != null &&
            serverDomain.provider != DnsProviderType.unknown)) {
      ProvidersController.initDnsProvider(
        DnsProviderSettings(
          provider: dnsProvider ?? serverDomain!.provider,
        ),
      );
    }

    if (box.get(BNames.hasFinalChecked, defaultValue: false)) {
      StagingOptions.verifyCertificate = true;
      return ServerInstallationFinished(
        providerApiToken: providerApiToken!,
        serverTypeIdentificator: serverTypeIdentificator ?? '',
        dnsApiToken: dnsApiToken!,
        serverDomain: serverDomain!,
        backblazeCredential: backblazeCredential!,
        serverDetails: serverDetails!,
        rootUser: box.get(BNames.rootUser),
        isServerStarted: box.get(BNames.isServerStarted, defaultValue: false),
        isServerResetedFirstTime:
            box.get(BNames.isServerResetedFirstTime, defaultValue: false),
        isServerResetedSecondTime:
            box.get(BNames.isServerResetedSecondTime, defaultValue: false),
      );
    }

    if (box.get(BNames.isRecoveringServer, defaultValue: false) &&
        serverDomain != null) {
      return ServerInstallationRecovery(
        providerApiToken: providerApiToken,
        dnsApiToken: dnsApiToken,
        serverDomain: serverDomain,
        backblazeCredential: backblazeCredential,
        serverDetails: serverDetails,
        rootUser: box.get(BNames.rootUser),
        currentStep: _getCurrentRecoveryStep(
          providerApiToken,
          dnsApiToken,
          serverDomain,
          serverDetails,
        ),
        recoveryCapabilities: await getRecoveryCapabilities(serverDomain),
      );
    }

    return ServerInstallationNotFinished(
      providerApiToken: providerApiToken,
      dnsApiToken: dnsApiToken,
      serverDomain: serverDomain,
      backblazeCredential: backblazeCredential,
      serverDetails: serverDetails,
      rootUser: box.get(BNames.rootUser),
      isServerStarted: box.get(BNames.isServerStarted, defaultValue: false),
      isServerResetedFirstTime:
          box.get(BNames.isServerResetedFirstTime, defaultValue: false),
      isServerResetedSecondTime:
          box.get(BNames.isServerResetedSecondTime, defaultValue: false),
      isLoading: box.get(BNames.isLoading, defaultValue: false),
      dnsMatches: null,
    );
  }

  RecoveryStep _getCurrentRecoveryStep(
    final String? serverProviderToken,
    final String? cloudflareToken,
    final ServerDomain serverDomain,
    final ServerHostingDetails? serverDetails,
  ) {
    if (serverDetails != null) {
      if (serverProviderToken != null) {
        if (serverDetails.provider != ServerProviderType.unknown) {
          if (serverDomain.provider != DnsProviderType.unknown) {
            return RecoveryStep.backblazeToken;
          }
          return RecoveryStep.dnsProviderToken;
        }
        return RecoveryStep.serverSelection;
      }
      return RecoveryStep.serverProviderToken;
    }
    return RecoveryStep.selecting;
  }

  void clearAppConfig() {
    box.clear();
    usersBox.clear();
  }

  Future<ServerHostingDetails> startServer(
    final ServerHostingDetails server,
  ) async {
    final result = await ProvidersController.currentServerProvider!.powerOn(
      server.id,
    );

    if (result.success && result.data != null) {
      server.copyWith(startTime: result.data);
    }

    return server;
  }

  Future<String?> getDomainId(final String token, final String domain) async {
    final result =
        await ProvidersController.currentDnsProvider!.tryInitApiByToken(token);
    return result.success
        ? (await ProvidersController.currentDnsProvider!.getZoneId(
            domain,
          ))
            .data
        : null;
  }

  Future<Map<String, bool>> isDnsAddressesMatch(
    final String? domainName,
    final String? ip4,
    final Map<String, bool> skippedMatches,
  ) async {
    final List<String> addresses = <String>[
      '$domainName',
      'api.$domainName',
      'cloud.$domainName',
      'meet.$domainName',
      'password.$domainName'
    ];

    final Map<String, bool> matches = <String, bool>{};

    for (final String address in addresses) {
      if (skippedMatches[address] ?? false) {
        matches[address] = true;
        continue;
      }
      final List<RRecord>? lookupRecordRes = await DnsUtils.lookupRecord(
        address,
        RRecordType.A,
        provider: DnsApiProvider.CLOUDFLARE,
      );
      getIt.get<ConsoleModel>().addMessage(
            Message(
              text:
                  'DnsLookup: address: $address, $RRecordType, provider: CLOUDFLARE, ip4: $ip4',
            ),
          );
      getIt.get<ConsoleModel>().addMessage(
            Message(
              text:
                  'DnsLookup: ${lookupRecordRes == null ? 'empty' : (lookupRecordRes[0].data != ip4 ? 'wrong ip4' : 'right ip4')}',
            ),
          );
      if (lookupRecordRes == null ||
          lookupRecordRes.isEmpty ||
          lookupRecordRes[0].data != ip4) {
        matches[address] = false;
      } else {
        matches[address] = true;
      }
    }

    return matches;
  }

  Future<bool> createDnsRecords(
    final ServerHostingDetails serverDetails,
    final ServerDomain domain, {
    required final void Function() onCancel,
  }) async {
    final serverProvider = ProvidersController.currentServerProvider!;

    void showDomainErrorPopUp(final String error) {
      showPopUpAlert(
        alertTitle: error,
        description: 'modals.delete_server_volume'.tr(),
        cancelButtonOnPressed: onCancel,
        actionButtonTitle: 'basis.delete'.tr(),
        actionButtonOnPressed: () async {
          await serverProvider.deleteServer(
            domain.domainName,
          );
          onCancel();
        },
      );
    }

    final GenericResult removingResult =
        await ProvidersController.currentDnsProvider!.removeDomainRecords(
      ip4: serverDetails.ip4,
      domain: domain,
    );

    if (!removingResult.success) {
      showDomainErrorPopUp('domain.error'.tr());
      return false;
    }

    bool createdSuccessfully = false;
    String errorMessage = 'domain.error'.tr();
    try {
      final GenericResult createResult =
          await ProvidersController.currentDnsProvider!.createDomainRecords(
        ip4: serverDetails.ip4,
        domain: domain,
      );
      createdSuccessfully = createResult.success;
    } on DioError catch (e) {
      if (e.response!.data['errors'][0]['code'] == 1038) {
        errorMessage = 'modals.you_cant_use_this_api'.tr();
      }
    }

    if (!createdSuccessfully) {
      showDomainErrorPopUp(errorMessage);
      return false;
    }

    return true;
  }

  Future<void> createDkimRecord(final ServerDomain cloudFlareDomain) async {
    final ServerApi api = ServerApi();

    late DnsRecord record;
    try {
      record = extractDkimRecord(await api.getDnsRecords())!;
    } catch (e) {
      print(e);
      rethrow;
    }

    await ProvidersController.currentDnsProvider!.setDnsRecord(
      record,
      cloudFlareDomain,
    );
  }

  Future<bool> isHttpServerWorking() async {
    final ServerApi api = ServerApi();
    return api.isHttpServerWorking();
  }

  Future<ServerHostingDetails> restart() async {
    final server = getIt<ApiConfigModel>().serverDetails!;

    final result = await ProvidersController.currentServerProvider!.restart(
      server.id,
    );

    if (result.success && result.data != null) {
      server.copyWith(startTime: result.data);
    }

    return server;
  }

  Future<ServerHostingDetails> powerOn() async {
    final server = getIt<ApiConfigModel>().serverDetails!;
    return startServer(server);
  }

  Future<ServerRecoveryCapabilities> getRecoveryCapabilities(
    final ServerDomain serverDomain,
  ) async {
    final ServerApi serverApi = ServerApi(
      isWithToken: false,
      overrideDomain: serverDomain.domainName,
    );
    final String? serverApiVersion = await serverApi.getApiVersion();
    if (serverApiVersion == null) {
      return ServerRecoveryCapabilities.none;
    }
    try {
      final Version parsedVersion = Version.parse(serverApiVersion);
      if (!VersionConstraint.parse('>=1.2.0').allows(parsedVersion)) {
        return ServerRecoveryCapabilities.legacy;
      }
      return ServerRecoveryCapabilities.loginTokens;
    } on FormatException {
      return ServerRecoveryCapabilities.none;
    }
  }

  Future<String> getServerIpFromDomain(final ServerDomain serverDomain) async {
    final List<RRecord>? lookup = await DnsUtils.lookupRecord(
      serverDomain.domainName,
      RRecordType.A,
      provider: DnsApiProvider.CLOUDFLARE,
    );
    if (lookup == null || lookup.isEmpty) {
      throw IpNotFoundException('No IP found for domain $serverDomain');
    }
    return lookup[0].data;
  }

  Future<String> getDeviceName() async {
    final DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
    if (kIsWeb) {
      return deviceInfo.webBrowserInfo.then(
        (final WebBrowserInfo value) =>
            '${value.browserName} ${value.platform}',
      );
    } else {
      if (Platform.isAndroid) {
        return deviceInfo.androidInfo.then(
          (final AndroidDeviceInfo value) =>
              '${value.model} ${value.version.release}',
        );
      } else if (Platform.isIOS) {
        return deviceInfo.iosInfo.then(
          (final IosDeviceInfo value) =>
              '${value.utsname.machine} ${value.systemName} ${value.systemVersion}',
        );
      } else if (Platform.isLinux) {
        return deviceInfo.linuxInfo
            .then((final LinuxDeviceInfo value) => value.prettyName);
      } else if (Platform.isMacOS) {
        return deviceInfo.macOsInfo.then(
          (final MacOsDeviceInfo value) =>
              '${value.hostName} ${value.computerName}',
        );
      } else if (Platform.isWindows) {
        return deviceInfo.windowsInfo
            .then((final WindowsDeviceInfo value) => value.computerName);
      }
    }
    return 'Unidentified';
  }

  Future<ServerHostingDetails> authorizeByNewDeviceKey(
    final ServerDomain serverDomain,
    final String newDeviceKey,
    final ServerRecoveryCapabilities recoveryCapabilities,
  ) async {
    final ServerApi serverApi = ServerApi(
      isWithToken: false,
      overrideDomain: serverDomain.domainName,
    );
    final String serverIp = await getServerIpFromDomain(serverDomain);
    final GenericResult<String> result = await serverApi.authorizeDevice(
      DeviceToken(device: await getDeviceName(), token: newDeviceKey),
    );

    if (result.success) {
      return ServerHostingDetails(
        apiToken: result.data,
        volume: ServerVolume(
          id: 0,
          name: '',
          sizeByte: 0,
          serverId: 0,
          linuxDevice: '',
        ),
        provider: ServerProviderType.unknown,
        id: 0,
        ip4: serverIp,
        startTime: null,
        createTime: null,
      );
    }

    throw ServerAuthorizationException(
      result.message ?? result.data,
    );
  }

  Future<ServerHostingDetails> authorizeByRecoveryKey(
    final ServerDomain serverDomain,
    final String recoveryKey,
    final ServerRecoveryCapabilities recoveryCapabilities,
  ) async {
    final ServerApi serverApi = ServerApi(
      isWithToken: false,
      overrideDomain: serverDomain.domainName,
    );
    final String serverIp = await getServerIpFromDomain(serverDomain);
    final GenericResult<String> result = await serverApi.useRecoveryToken(
      DeviceToken(device: await getDeviceName(), token: recoveryKey),
    );

    if (result.success) {
      return ServerHostingDetails(
        apiToken: result.data,
        volume: ServerVolume(
          id: 0,
          name: '',
          sizeByte: 0,
          serverId: 0,
          linuxDevice: '',
        ),
        provider: ServerProviderType.unknown,
        id: 0,
        ip4: serverIp,
        startTime: null,
        createTime: null,
      );
    }

    throw ServerAuthorizationException(
      result.message ?? result.data,
    );
  }

  Future<ServerHostingDetails> authorizeByApiToken(
    final ServerDomain serverDomain,
    final String apiToken,
    final ServerRecoveryCapabilities recoveryCapabilities,
  ) async {
    final ServerApi serverApi = ServerApi(
      isWithToken: true,
      overrideDomain: serverDomain.domainName,
      customToken: apiToken,
    );
    final String serverIp = await getServerIpFromDomain(serverDomain);
    if (recoveryCapabilities == ServerRecoveryCapabilities.legacy) {
      if (await serverApi.isHttpServerWorking()) {
        return ServerHostingDetails(
          apiToken: apiToken,
          volume: ServerVolume(
            id: 0,
            name: '',
            serverId: 0,
            sizeByte: 0,
            linuxDevice: '',
          ),
          provider: ServerProviderType.unknown,
          id: 0,
          ip4: serverIp,
          startTime: null,
          createTime: null,
        );
      } else {
        throw ServerAuthorizationException(
          "Couldn't connect to server with this token",
        );
      }
    }
    final GenericResult<String> deviceAuthKey =
        await serverApi.createDeviceToken();
    final GenericResult<String> result = await serverApi.authorizeDevice(
      DeviceToken(device: await getDeviceName(), token: deviceAuthKey.data),
    );

    if (result.success) {
      return ServerHostingDetails(
        apiToken: result.data,
        volume: ServerVolume(
          id: 0,
          name: '',
          sizeByte: 0,
          serverId: 0,
          linuxDevice: '',
        ),
        provider: ServerProviderType.unknown,
        id: 0,
        ip4: serverIp,
        startTime: null,
        createTime: null,
      );
    }

    throw ServerAuthorizationException(
      result.message ?? result.data,
    );
  }

  Future<User> getMainUser() async {
    final ServerApi serverApi = ServerApi();
    const User fallbackUser = User(
      isFoundOnServer: false,
      type: UserType.primary,
      note: "Couldn't find main user on server, API is outdated",
      login: 'UNKNOWN',
      sshKeys: [],
    );

    final String? serverApiVersion = await serverApi.getApiVersion();
    final users = await serverApi.getAllUsers();
    if (serverApiVersion == null || users.isEmpty) {
      return fallbackUser;
    }
    try {
      final Version parsedVersion = Version.parse(serverApiVersion);
      if (!VersionConstraint.parse('>=1.2.5').allows(parsedVersion)) {
        return fallbackUser;
      }
      return users.firstWhere(
        (final User user) => user.type == UserType.primary,
      );
    } on FormatException {
      return fallbackUser;
    }
  }

  Future<List<ServerBasicInfo>> getServersOnProviderAccount() async =>
      (await ProvidersController.currentServerProvider!.getServers()).data;

  Future<void> saveServerDetails(
    final ServerHostingDetails serverDetails,
  ) async {
    await getIt<ApiConfigModel>().storeServerDetails(serverDetails);
  }

  Future<void> deleteServerDetails() async {
    await box.delete(BNames.serverDetails);
    getIt<ApiConfigModel>().init();
  }

  Future<void> saveServerProviderType(final ServerProviderType type) async {
    await getIt<ApiConfigModel>().storeServerProviderType(type);
  }

  Future<void> saveDnsProviderType(final DnsProviderType type) async {
    await getIt<ApiConfigModel>().storeDnsProviderType(type);
  }

  Future<void> saveServerProviderKey(final String key) async {
    await getIt<ApiConfigModel>().storeServerProviderKey(key);
  }

  Future<void> saveServerType(final ServerType serverType) async {
    await getIt<ApiConfigModel>().storeServerTypeIdentifier(
      serverType.identifier,
    );
    await getIt<ApiConfigModel>().storeServerLocation(
      serverType.location.identifier,
    );
  }

  Future<void> deleteServerProviderKey() async {
    await box.delete(BNames.hetznerKey);
    getIt<ApiConfigModel>().init();
  }

  Future<void> saveBackblazeKey(
    final BackblazeCredential backblazeCredential,
  ) async {
    await getIt<ApiConfigModel>().storeBackblazeCredential(backblazeCredential);
  }

  Future<void> deleteBackblazeKey() async {
    await box.delete(BNames.backblazeCredential);
    getIt<ApiConfigModel>().init();
  }

  Future<void> setDnsApiToken(final String key) async {
    await getIt<ApiConfigModel>().storeDnsProviderKey(key);
  }

  Future<void> deleteDnsProviderKey() async {
    await box.delete(BNames.cloudFlareKey);
    getIt<ApiConfigModel>().init();
  }

  Future<void> saveDomain(final ServerDomain serverDomain) async {
    await getIt<ApiConfigModel>().storeServerDomain(serverDomain);
  }

  Future<void> deleteDomain() async {
    await box.delete(BNames.serverDomain);
    getIt<ApiConfigModel>().init();
  }

  Future<void> saveIsServerStarted(final bool value) async {
    await box.put(BNames.isServerStarted, value);
  }

  Future<void> saveIsServerResetedFirstTime(final bool value) async {
    await box.put(BNames.isServerResetedFirstTime, value);
  }

  Future<void> saveIsServerResetedSecondTime(final bool value) async {
    await box.put(BNames.isServerResetedSecondTime, value);
  }

  Future<void> saveRootUser(final User rootUser) async {
    await box.put(BNames.rootUser, rootUser);
  }

  Future<void> saveIsRecoveringServer(final bool value) async {
    await box.put(BNames.isRecoveringServer, value);
  }

  Future<void> saveHasFinalChecked(final bool value) async {
    await box.put(BNames.hasFinalChecked, value);
  }

  Future<bool> deleteServer(final ServerDomain serverDomain) async {
    final deletionResult =
        await ProvidersController.currentServerProvider!.deleteServer(
      serverDomain.domainName,
    );

    if (!deletionResult.success) {
      getIt<NavigationService>()
          .showSnackBar('modals.server_validators_error'.tr());
      return false;
    }

    await box.put(BNames.hasFinalChecked, false);
    await box.put(BNames.isServerStarted, false);
    await box.put(BNames.isServerResetedFirstTime, false);
    await box.put(BNames.isServerResetedSecondTime, false);
    await box.put(BNames.isLoading, false);
    await box.put(BNames.serverDetails, null);

    final GenericResult<void> removalResult = await ProvidersController
        .currentDnsProvider!
        .removeDomainRecords(domain: serverDomain);

    if (!removalResult.success) {
      getIt<NavigationService>().showSnackBar('modals.dns_removal_error'.tr());
    }
    return true;
  }

  Future<void> deleteServerRelatedRecords() async {
    await box.deleteAll([
      BNames.serverDetails,
      BNames.isServerStarted,
      BNames.isServerResetedFirstTime,
      BNames.isServerResetedSecondTime,
      BNames.hasFinalChecked,
      BNames.isLoading,
    ]);
    getIt<ApiConfigModel>().init();
  }
}