import 'dart:async';
import 'dart:developer';

import 'package:fluffychat/pages/chat/chat.dart';
import 'package:fluffychat/pangea/choreographer/controllers/alternative_translator.dart';
import 'package:fluffychat/pangea/choreographer/controllers/igc_controller.dart';
import 'package:fluffychat/pangea/constants/language_constants.dart';
import 'package:fluffychat/pangea/controllers/pangea_controller.dart';
import 'package:fluffychat/pangea/controllers/subscription_controller.dart';
import 'package:fluffychat/pangea/enum/assistance_state_enum.dart';
import 'package:fluffychat/pangea/enum/edit_type.dart';
import 'package:fluffychat/pangea/models/it_step.dart';
import 'package:fluffychat/pangea/models/representation_content_model.dart';
import 'package:fluffychat/pangea/models/space_model.dart';
import 'package:fluffychat/pangea/models/tokens_event_content_model.dart';
import 'package:fluffychat/pangea/utils/any_state_holder.dart';
import 'package:fluffychat/pangea/utils/error_handler.dart';
import 'package:fluffychat/pangea/utils/overlay.dart';
import 'package:fluffychat/pangea/widgets/igc/paywall_card.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:sentry_flutter/sentry_flutter.dart';

import '../../../widgets/matrix.dart';
import '../../models/choreo_record.dart';
import '../../models/language_model.dart';
import '../../models/pangea_match_model.dart';
import '../../widgets/igc/pangea_text_controller.dart';
import 'error_service.dart';
import 'it_controller.dart';

enum ChoreoMode { igc, it }

class Choreographer {
  PangeaController pangeaController;
  ChatController chatController;
  late PangeaTextController _textController;
  late ITController itController;
  late IgcController igc;
  late AlternativeTranslator altTranslator;
  late ErrorService errorService;

  bool isFetching = false;
  Timer? debounceTimer;
  ChoreoRecord choreoRecord = ChoreoRecord.newRecord;
  // last checked by IGC or translation
  String? _lastChecked;
  ChoreoMode choreoMode = ChoreoMode.igc;
  final StreamController stateListener = StreamController.broadcast();
  StreamSubscription? trialStream;

  Choreographer(this.pangeaController, this.chatController) {
    _initialize();
  }
  _initialize() {
    _textController = PangeaTextController(choreographer: this);
    itController = ITController(this);
    igc = IgcController(this);
    errorService = ErrorService(this);
    altTranslator = AlternativeTranslator(this);
    _textController.addListener(_onChangeListener);
    trialStream = pangeaController
        .subscriptionController.trialActivationStream.stream
        .listen((_) => _onChangeListener);

    clear();
  }

  void send(BuildContext context) {
    if (isFetching) return;

    if (pangeaController.subscriptionController.canSendStatus ==
        CanSendStatus.showPaywall) {
      OverlayUtil.showPositionedCard(
        context: context,
        cardToShow: const PaywallCard(),
        cardSize: const Size(325, 325),
        transformTargetId: inputTransformTargetKey,
      );
      return;
    }

    if (!igc.hasRelevantIGCTextData) {
      getLanguageHelp().then((value) => _sendWithIGC(context));
    } else {
      _sendWithIGC(context);
    }
  }

  Future<void> _sendWithIGC(BuildContext context) async {
    if (!igc.canSendMessage) {
      igc.showFirstMatch(context);
      return;
    }

    final PangeaRepresentation? originalWritten =
        choreoRecord.includedIT && itController.sourceText != null
            ? PangeaRepresentation(
                langCode: l1LangCode ?? LanguageKeys.unknownLanguage,
                text: itController.sourceText!,
                originalWritten: true,
                originalSent: false,
              )
            : null;

    // TODO - why does both it and igc need to be enabled for choreo to be applicable?
    // final ChoreoRecord? applicableChoreo =
    //     isITandIGCEnabled && igc.igcTextData != null ? choreoRecord : null;

    // if tokens or language detection are not available, we should get them
    // notes
    // 1) we probably need to move this to after we clear the input field
    // or the user could experience some lag here.
    // 2)  that this call is being made after we've determined if we have an applicable choreo in order to
    // say whether correction was run on the message. we may eventually want
    // to edit the useType after
    if (igc.igcTextData?.tokens == null ||
        igc.igcTextData?.detectedLanguage == null) {
      await igc.getIGCTextData(onlyTokensAndLanguageDetection: true);
    }

    final PangeaRepresentation originalSent = PangeaRepresentation(
      langCode:
          igc.igcTextData?.detectedLanguage ?? LanguageKeys.unknownLanguage,
      text: currentText,
      originalSent: true,
      originalWritten: originalWritten == null,
    );

    final PangeaMessageTokens? tokensSent = igc.igcTextData?.tokens != null
        ? PangeaMessageTokens(tokens: igc.igcTextData!.tokens)
        : null;

    chatController.send(
      // originalWritten: originalWritten,
      originalSent: originalSent,
      tokensSent: tokensSent,
      //TODO - save originalwritten tokens
      // choreo: applicableChoreo,
      choreo: choreoRecord,
    );

    clear();
  }

  _resetDebounceTimer() {
    if (debounceTimer != null) {
      debounceTimer?.cancel();
      debounceTimer = null;
    }
  }

  void onITStart(PangeaMatch itMatch) {
    if (!itMatch.isITStart) {
      throw Exception("this isn't an itStart match!");
    }
    choreoMode = ChoreoMode.it;
    itController.initializeIT(
      ITStartData(_textController.text, igc.igcTextData?.detectedLanguage),
    );
    itMatch.status = PangeaMatchStatus.accepted;

    choreoRecord.addRecord(_textController.text, match: itMatch);

    //PTODO - if totally in L1, save tokens, that's good stuff

    igc.clear();

    _textController.setSystemText("", EditType.itStart);
  }

  /// Handles any changes to the text input
  _onChangeListener() {
    if (_noChange) {
      return;
    }

    if (_textController.editType == EditType.igc) {
      _lastChecked = _textController.text;
      _textController.editType = EditType.keyboard;
      return;
    }

    // not sure if this is necessary now
    MatrixState.pAnyState.closeOverlay();

    if (errorService.isError) {
      return;
    }

    igc.clear();

    _resetDebounceTimer();

    if (editTypeIsKeyboard) {
      debounceTimer ??= Timer(
        const Duration(milliseconds: 1500),
        () => getLanguageHelp(),
      );
    } else {
      getLanguageHelp(
        onlyTokensAndLanguageDetection: ChoreoMode.it == choreoMode,
      );
    }

    //Note: we don't set the keyboard type on each keyboard stroke so this is how we default to
    //a change being from the keyboard unless explicitly set to one of the other
    //types when that action happens (e.g. an it/igc choice is selected)
    textController.editType = EditType.keyboard;
  }

  /// Fetches the language help for the current text, including grammar correction, language detection,
  /// tokens, and translations. Includes logic to exit the flow if the user is not subscribed, if the tools are not enabled, or
  /// or if autoIGC is not enabled and the user has not manually requested it.
  /// [onlyTokensAndLanguageDetection] will
  Future<void> getLanguageHelp({
    bool onlyTokensAndLanguageDetection = false,
    bool manual = false,
  }) async {
    try {
      if (errorService.isError) return;
      final CanSendStatus canSendStatus =
          pangeaController.subscriptionController.canSendStatus;

      if (canSendStatus != CanSendStatus.subscribed ||
          (!igcEnabled && !itEnabled) ||
          (!isAutoIGCEnabled && !manual && choreoMode != ChoreoMode.it)) {
        return;
      }

      startLoading();
      if (choreoMode == ChoreoMode.it &&
          itController.isTranslationDone &&
          !onlyTokensAndLanguageDetection) {
        // debugger(when: kDebugMode);
      }

      await (choreoMode == ChoreoMode.it && !itController.isTranslationDone
          ? itController.getTranslationData(_useCustomInput)
          : igc.getIGCTextData(
              onlyTokensAndLanguageDetection: onlyTokensAndLanguageDetection,
            ));
    } catch (err, stack) {
      ErrorHandler.logError(e: err, s: stack);
    } finally {
      stopLoading();
    }
  }

  void onITChoiceSelect(ITStep step) {
    choreoRecord.addRecord(_textController.text, step: step);
    _textController.setSystemText(
      _textController.text + step.continuances[step.chosen!].text,
      step.continuances[step.chosen!].gold
          ? EditType.itGold
          : EditType.itStandard,
    );
    _textController.selection =
        TextSelection.collapsed(offset: _textController.text.length);
    giveInputFocus();
  }

  Future<void> onReplacementSelect({
    required int matchIndex,
    required int choiceIndex,
  }) async {
    try {
      if (igc.igcTextData == null) {
        ErrorHandler.logError(
          e: "onReplacementSelect with null igcTextData",
          s: StackTrace.current,
        );
        MatrixState.pAnyState.closeOverlay();
        return;
      }
      if (igc.igcTextData!.matches[matchIndex].match.choices == null) {
        ErrorHandler.logError(
          e: "onReplacementSelect with null choices",
          s: StackTrace.current,
        );
        MatrixState.pAnyState.closeOverlay();
        return;
      }

      //if it's the wrong choice, return
      // if (!igc.igcTextData!.matches[matchIndex].match.choices![choiceIndex]
      //     .selected) {
      //   igc.igcTextData!.matches[matchIndex].match.choices![choiceIndex]
      //       .selected = true;
      //   setState();
      //   return;
      // }

      igc.igcTextData!.matches[matchIndex].match.choices![choiceIndex]
          .selected = true;

      //if it's the right choice, replace in text
      choreoRecord.addRecord(
        _textController.text,
        match: igc.igcTextData!.matches[matchIndex].copyWith
          ..status = PangeaMatchStatus.accepted,
      );

      igc.igcTextData!.acceptReplacement(
        matchIndex,
        choiceIndex,
      );

      _textController.setSystemText(
        igc.igcTextData!.originalInput,
        EditType.igc,
      );

      MatrixState.pAnyState.closeOverlay();
      setState();
    } catch (err, stack) {
      debugger(when: kDebugMode);
      Sentry.addBreadcrumb(
        Breadcrumb.fromJson(
          {
            "igctextDdata": igc.igcTextData?.toJson(),
            "matchIndex": matchIndex,
            "choiceIndex": choiceIndex,
          },
        ),
      );
      ErrorHandler.logError(e: err, s: stack);
      igc.igcTextData?.matches.clear();
    } finally {
      giveInputFocus();
      setState();
    }
  }

  void onIgnoreMatch({required int cursorOffset}) {
    try {
      if (igc.igcTextData == null) {
        debugger(when: kDebugMode);
        ErrorHandler.logError(
          m: "should not be in onIgnoreMatch with null igcTextData",
          s: StackTrace.current,
        );
        return;
      }

      final int matchIndex = igc.igcTextData!.getTopMatchIndexForOffset(
        cursorOffset,
      );

      if (matchIndex == -1) {
        debugger(when: kDebugMode);
        throw Exception("Cannnot find the ignored match in igcTextData");
      }

      igc.igcTextData!.matches[matchIndex].status = PangeaMatchStatus.ignored;
      choreoRecord.addRecord(
        _textController.text,
        match: igc.igcTextData!.matches[matchIndex],
      );

      igc.igcTextData!.matches.removeAt(matchIndex);
    } catch (err, stack) {
      debugger(when: kDebugMode);
      Sentry.addBreadcrumb(
        Breadcrumb.fromJson(
          {"igcTextData": igc.igcTextData?.toJson(), "offset": cursorOffset},
        ),
      );
      ErrorHandler.logError(
        e: err,
        s: stack,
      );
      igc.igcTextData?.matches.clear();
    } finally {
      setState();
      giveInputFocus();
    }
  }

  void onSelectAlternativeTranslation(String translation) {
    // PTODO - add some kind of record of this
    // choreoRecord.addRecord(_textController.text, match);

    _textController.setSystemText(
      translation,
      EditType.alternativeTranslation,
    );
    altTranslator.clear();
    altTranslator.translationFeedbackKey = FeedbackKey.allDone;
    altTranslator.showTranslationFeedback = true;
    giveInputFocus();
    setState();
  }

  giveInputFocus() {
    Future.delayed(Duration.zero, () {
      chatController.inputFocus.requestFocus();
    });
  }

  String get currentText => _textController.text;

  PangeaTextController get textController => _textController;

  String get accessToken => pangeaController.userController.accessToken;

  clear() {
    choreoMode = ChoreoMode.igc;
    _lastChecked = null;
    isFetching = false;
    choreoRecord = ChoreoRecord.newRecord;
    itController.clear();
    igc.clear();
    // errorService.clear();
    _resetDebounceTimer();
  }

  void onMatchError({int? cursorOffset}) {
    if (cursorOffset == null) {
      igc.igcTextData?.matches.clear();
    } else {
      final int? matchIndex = igc.igcTextData?.getTopMatchIndexForOffset(
        cursorOffset,
      );
      matchIndex == -1 || matchIndex == null
          ? igc.igcTextData?.matches.clear()
          : igc.igcTextData?.matches.removeAt(matchIndex);
    }

    setState();
    giveInputFocus();
  }

  dispose() {
    _textController.dispose();
    trialStream?.cancel();
  }

  LanguageModel? get l2Lang {
    return pangeaController.languageController.activeL2Model();
  }

  String? get l2LangCode => l2Lang?.langCode;

  LanguageModel? get l1Lang =>
      pangeaController.languageController.activeL1Model();

  String? get l1LangCode => l1Lang?.langCode;

  String? get userId => pangeaController.userController.userId;

  bool get _noChange =>
      _lastChecked != null && _lastChecked == _textController.text;

  void startLoading() {
    _lastChecked = _textController.text;
    isFetching = true;
    setState();
  }

  void stopLoading() {
    isFetching = false;
    setState();
  }

  get roomId => chatController.roomId;

  bool get _useCustomInput => [
        EditType.keyboard,
        EditType.igc,
        EditType.alternativeTranslation,
      ].contains(_textController.editType);

  bool get editTypeIsKeyboard => EditType.keyboard == _textController.editType;

  setState() {
    if (!stateListener.isClosed) {
      stateListener.add(0);
    }
  }

  bool get showIsError => !itController.isOpen && errorService.isError;

  LayerLinkAndKey get itBarLinkAndKey =>
      MatrixState.pAnyState.layerLinkAndKey(itBarTransformTargetKey);

  String get itBarTransformTargetKey => 'it_bar$roomId';

  LayerLinkAndKey get inputLayerLinkAndKey =>
      MatrixState.pAnyState.layerLinkAndKey(inputTransformTargetKey);

  String get inputTransformTargetKey => 'input$roomId';

  LayerLinkAndKey get itBotLayerLinkAndKey =>
      MatrixState.pAnyState.layerLinkAndKey(itBotTransformTargetKey);

  String get itBotTransformTargetKey => 'itBot$roomId';

  bool get igcEnabled => pangeaController.permissionsController.isToolEnabled(
        ToolSetting.interactiveGrammar,
        chatController.room,
      );

  bool get itEnabled => pangeaController.permissionsController.isToolEnabled(
        ToolSetting.interactiveTranslator,
        chatController.room,
      );

  bool get itAutoPlayEnabled {
    return pangeaController.userController.profile.userSettings.itAutoPlay;
  }

  bool get definitionsEnabled =>
      pangeaController.permissionsController.isToolEnabled(
        ToolSetting.definitions,
        chatController.room,
      );

  bool get immersionMode =>
      pangeaController.permissionsController.isToolEnabled(
        ToolSetting.immersionMode,
        chatController.room,
      );

  // bool get translationEnabled =>
  //     pangeaController.permissionsController.isToolEnabled(
  //       ToolSetting.translations,
  //       chatController.room,
  //     );

  bool get isITandIGCEnabled =>
      pangeaController.permissionsController.isWritingAssistanceEnabled(
        chatController.room,
      );

  bool get isAutoIGCEnabled =>
      pangeaController.permissionsController.isToolEnabled(
        ToolSetting.autoIGC,
        chatController.room,
      );

  AssistanceState get assistanceState {
    if (currentText.isEmpty && itController.sourceText == null) {
      return AssistanceState.noMessage;
    }

    if (igc.igcTextData?.matches.isNotEmpty ?? false) {
      return AssistanceState.fetched;
    }

    if (isFetching) {
      return AssistanceState.fetching;
    }

    if (igc.igcTextData == null) {
      return AssistanceState.notFetched;
    }

    return AssistanceState.complete;
  }
}