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

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

import 'package:collection/collection.dart';
import 'package:matrix/matrix.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/pages/chat/chat.dart';
import 'package:fluffychat/pangea/common/utils/error_handler.dart';
import 'package:fluffychat/pangea/common/utils/overlay.dart';
import 'package:fluffychat/pangea/constructs/construct_identifier.dart';
import 'package:fluffychat/pangea/events/event_wrappers/pangea_message_event.dart';
import 'package:fluffychat/pangea/events/event_wrappers/pangea_representation_event.dart';
import 'package:fluffychat/pangea/events/models/pangea_token_model.dart';
import 'package:fluffychat/pangea/events/models/pangea_token_text_model.dart';
import 'package:fluffychat/pangea/events/models/tokens_event_content_model.dart';
import 'package:fluffychat/pangea/extensions/pangea_room_extension.dart';
import 'package:fluffychat/pangea/lemmas/lemma_info_response.dart';
import 'package:fluffychat/pangea/practice_activities/activity_type_enum.dart';
import 'package:fluffychat/pangea/practice_activities/practice_activity_model.dart';
import 'package:fluffychat/pangea/practice_activities/practice_choice.dart';
import 'package:fluffychat/pangea/practice_activities/practice_selection.dart';
import 'package:fluffychat/pangea/practice_activities/practice_selection_repo.dart';
import 'package:fluffychat/pangea/toolbar/controllers/text_to_speech_controller.dart';
import 'package:fluffychat/pangea/toolbar/enums/message_mode_enum.dart';
import 'package:fluffychat/pangea/toolbar/reading_assistance_input_row/morph_selection.dart';
import 'package:fluffychat/pangea/toolbar/widgets/message_selection_positioner.dart';
import 'package:fluffychat/pangea/toolbar/widgets/reading_assistance_content.dart';
import 'package:fluffychat/widgets/matrix.dart';

/// Controls data at the top level of the toolbar (mainly token / toolbar mode selection)
class MessageSelectionOverlay extends StatefulWidget {
  final ChatController chatController;
  final Event _event;
  final Event? _nextEvent;
  final Event? _prevEvent;
  final PangeaToken? _initialSelectedToken;
  final Timeline _timeline;

  const MessageSelectionOverlay({
    required this.chatController,
    required Event event,
    required PangeaToken? initialSelectedToken,
    required Event? nextEvent,
    required Event? prevEvent,
    required Timeline timeline,
    super.key,
  })  : _initialSelectedToken = initialSelectedToken,
        _nextEvent = nextEvent,
        _prevEvent = prevEvent,
        _event = event,
        _timeline = timeline;

  @override
  MessageOverlayController createState() => MessageOverlayController();
}

class MessageOverlayController extends State<MessageSelectionOverlay>
    with SingleTickerProviderStateMixin {
  Event get event => widget._event;
  /////////////////////////////////////
  /// Variables
  /////////////////////////////////////
  MessageMode toolbarMode = MessageMode.noneSelected;

  Map<ConstructIdentifier, LemmaInfoResponse>? messageLemmaInfos;

  /// set and cleared by the PracticeActivityCard
  /// has to be at this level so drag targets can access it
  PracticeActivityModel? activity;

  /// selectedMorph is used for morph activities
  MorphSelection? selectedMorph;

  /// tracks selected choice
  PracticeChoice? selectedChoice;

  PangeaTokenText? _selectedSpan;

  List<PangeaTokenText>? _highlightedTokens;
  bool initialized = false;
  bool isPlayingAudio = false;

  final GlobalKey<ReadingAssistanceContentState> wordZoomKey = GlobalKey();

  double maxWidth = AppConfig.toolbarMinWidth;

  /////////////////////////////////////
  /// Lifecycle
  /////////////////////////////////////

  @override
  void dispose() {
    super.dispose();
  }

  @override
  void initState() {
    initializeTokensAndMode();
    super.initState();
  }

  Future<void> initializeTokensAndMode() async {
    try {
      RepresentationEvent? repEvent =
          pangeaMessageEvent?.messageDisplayRepresentation;
      repEvent ??= await _fetchNewRepEvent();

      if (repEvent?.event != null) {
        await repEvent!.sendTokensEvent(
          repEvent.event!.eventId,
          widget._event.room,
          MatrixState.pangeaController.languageController.userL1!.langCode,
          MatrixState.pangeaController.languageController.userL2!.langCode,
        );
      }
      // If repEvent is originalSent but it's missing tokens, then fetch tokens.
      // An edge case, but has happened with some bot message.
      else if (repEvent != null &&
          repEvent.tokens == null &&
          repEvent.content.originalSent) {
        final tokens = await repEvent.tokensGlobal(
          pangeaMessageEvent!.senderId,
          pangeaMessageEvent!.event.originServerTs,
        );
        await pangeaMessageEvent!.room.pangeaSendTextEvent(
          pangeaMessageEvent!.messageDisplayText,
          editEventId: pangeaMessageEvent!.eventId,
          originalSent: pangeaMessageEvent!.originalSent?.content,
          originalWritten: pangeaMessageEvent!.originalWritten?.content,
          tokensSent: PangeaMessageTokens(tokens: tokens),
          choreo: pangeaMessageEvent!.originalSent?.choreo,
        );
      }

      // Get all the lemma infos
      final messageVocabConstructIds = pangeaMessageEvent!
          .messageDisplayRepresentation!.tokensToSave
          .map((e) => e.vocabConstructID)
          .toList();
      final List<Future<LemmaInfoResponse>> lemmaInfoFutures =
          messageVocabConstructIds
              .map((token) => token.getLemmaInfo())
              .toList();
      final List<LemmaInfoResponse> lemmaInfos =
          await Future.wait(lemmaInfoFutures);
      messageLemmaInfos = Map.fromIterables(
        messageVocabConstructIds,
        lemmaInfos,
      );
    } catch (e, s) {
      debugger(when: kDebugMode);
      ErrorHandler.logError(
        e: e,
        s: s,
        data: {
          "eventID": pangeaMessageEvent?.eventId,
        },
      );
    } finally {
      _initializeSelectedToken();
      _setInitialToolbarMode();
      messageLemmaInfos ??= {};
      initialized = true;
      if (mounted) setState(() {});
    }
  }

  Future<void> _setInitialToolbarMode() async {
    if (pangeaMessageEvent?.isAudioMessage ?? false) {
      updateToolbarMode(MessageMode.listening);
      return;
    }

    // 1) if we have a hidden word activity, then we should start with that
    if (practiceSelection?.hasHiddenWordActivity ?? false) {
      updateToolbarMode(MessageMode.practiceActivity);
      return;
    }

    // if (selectedToken != null) {
    //   updateToolbarMode(selectedToken!.modeForToken);
    //   return;
    // }

    // Note: this setting is now hidden so this will always be false
    // leaving this here in case we want to bring it back
    // if (MatrixState.pangeaController.userController.profile.userSettings
    //     .autoPlayMessages) {
    //   return setState(() => toolbarMode = MessageMode.textToSpeech);
    // }

    // defaults to noneSelected
  }

  /// Decides whether an _initialSelectedToken should be used
  /// for a first practice activity on the word meaning
  void _initializeSelectedToken() {
    // if there is no initial selected token, then we don't need to do anything
    if (widget._initialSelectedToken == null || practiceSelection == null) {
      return;
    }

    // should not already be involved in a hidden word activity
    // final isInHiddenWordActivity =
    //     messageAnalyticsEntry!.isTokenInHiddenWordActivity(
    //   widget._initialSelectedToken!,
    // );

    // // whether the activity should generally be involved in an activity
    if (practiceSelection?.hasHiddenWordActivity == true) {
      return;
    }

    _updateSelectedSpan(widget._initialSelectedToken!.text);
  }

  /////////////////////////////////////
  /// State setting
  /////////////////////////////////////

  /// We need to check if the setState call is safe to call immediately
  /// Kept getting the error: setState() or markNeedsBuild() called during build.
  /// This is a workaround to prevent that error
  @override
  void setState(VoidCallback fn) {
    // if (pangeaMessageEvent != null) {
    //   debugger(when: kDebugMode);
    //   modeLevel = toolbarMode.currentChoiceMode(this, pangeaMessageEvent!);
    // } else {
    //   debugger(when: kDebugMode);
    // }

    final phase = SchedulerBinding.instance.schedulerPhase;
    if (mounted &&
        (phase == SchedulerPhase.idle ||
            phase == SchedulerPhase.postFrameCallbacks)) {
      // It's safe to call setState immediately
      try {
        wordZoomKey.currentState?.setState(() {});

        super.setState(fn);
      } catch (e, s) {
        ErrorHandler.logError(
          e: "Error calling setState in MessageSelectionOverlay: $e",
          s: s,
          data: {},
        );
      }
    } else {
      // Defer the setState call to after the current frame
      WidgetsBinding.instance.addPostFrameCallback((_) {
        try {
          if (mounted) super.setState(fn);
        } catch (e, s) {
          ErrorHandler.logError(
            e: "Error calling setState in MessageSelectionOverlay after postframeCallback: $e",
            s: s,
            data: {},
          );
        }
      });
    }
  }

  /// Update [selectedSpan]
  void _updateSelectedSpan(PangeaTokenText selectedSpan, [bool force = false]) {
    if (selectedMorph != null) {
      selectedMorph = null;
    }
    // close overlay of previous token
    if (selectedToken != null) {
      MatrixState.pAnyState.closeOverlay(
        selectedToken!.text.uniqueKey,
      );
    }

    if (selectedSpan == _selectedSpan && !force) {
      _selectedSpan = null;
    } else {
      _selectedSpan = selectedSpan;
    }

    if (selectedToken != null) {
      final entry = ReadingAssistanceContent(
        key: wordZoomKey,
        pangeaMessageEvent: pangeaMessageEvent!,
        overlayController: this,
      );
      if (mounted) {
        OverlayUtil.showPositionedCard(
          context: context,
          cardToShow: entry,
          transformTargetId: selectedToken!.text.uniqueKey,
          closePrevOverlay: false,
          backDropToDismiss: false,
          addBorder: false,
          overlayKey: selectedToken!.text.uniqueKey,
          maxHeight: AppConfig.toolbarMaxHeight,
          maxWidth: AppConfig.toolbarMinWidth,
        );
      }
    }

    if (mounted) setState(() {});
  }

  void updateToolbarMode(MessageMode mode) => setState(() {
        selectedChoice = null;

        // close overlay of any selected token
        if (_selectedSpan != null) {
          _updateSelectedSpan(_selectedSpan!);
        }

        toolbarMode = mode;
        if (toolbarMode != MessageMode.wordMorph) {
          selectedMorph = null;
        }
      });

  ///////////////////////////////////
  /// User action handlers
  /////////////////////////////////////
  void onRequestForMeaningChallenge() {
    if (practiceSelection == null) {
      debugger(when: kDebugMode);
      ErrorHandler.logError(
        e: "MessageAnalyticsEntry is null in onRequestForMeaningChallenge",
        data: {},
      );
      return;
    }
    practiceSelection!.addMessageMeaningActivity();

    if (mounted) {
      setState(() {});
    }
  }

  void onChoiceSelect(PracticeChoice choice, [bool force = false]) {
    if (selectedChoice == choice && !force) {
      selectedChoice = null;
    } else {
      selectedChoice = choice;
    }

    setState(() {});
  }

  void onMorphActivitySelect(MorphSelection newMorph) {
    toolbarMode = MessageMode.wordMorph;
    // // close overlay of previous token
    if (_selectedSpan != null && _selectedSpan != newMorph.token.text) {
      _updateSelectedSpan(_selectedSpan!);
    }
    selectedMorph = newMorph;
    setState(() {});
  }

  /////////////////////////////////////
  /// Getters
  ////////////////////////////////////
  PangeaMessageEvent? get pangeaMessageEvent => PangeaMessageEvent(
        event: widget._event,
        timeline: widget._timeline,
        ownMessage: widget._event.room.client.userID == widget._event.senderId,
      );

  bool get showToolbarButtons =>
      pangeaMessageEvent != null &&
      pangeaMessageEvent!.event.messageType == MessageTypes.Text;

  bool get isPracticeComplete => isTranslationUnlocked;

  bool get isEmojiDone =>
      practiceSelection
          ?.activities(ActivityTypeEnum.emoji)
          .every((a) => a.isComplete) ==
      true;

  bool get isMeaningDone =>
      practiceSelection
          ?.activities(ActivityTypeEnum.wordMeaning)
          .every((a) => a.isComplete) ==
      true;

  bool get isListeningDone =>
      practiceSelection
          ?.activities(ActivityTypeEnum.wordFocusListening)
          .every((a) => a.isComplete) ==
      true;

  bool get isMorphDone =>
      practiceSelection
          ?.activities(ActivityTypeEnum.morphId)
          .every((a) => a.isComplete) ==
      true;

  /// you have to complete one of the mode mini-games to unlock translation
  bool get isTranslationUnlocked =>
      pangeaMessageEvent?.ownMessage == true ||
      !messageInUserL2 ||
      (messageLemmaInfos?.isEmpty ?? false) ||
      isEmojiDone ||
      isMeaningDone ||
      isListeningDone ||
      isMorphDone;

  bool get isTotallyDone =>
      isEmojiDone && isMeaningDone && isListeningDone && isMorphDone;

  PracticeSelection? get practiceSelection =>
      pangeaMessageEvent?.messageDisplayRepresentation?.tokens != null
          ? PracticeSelectionRepo.get(
              pangeaMessageEvent!.messageDisplayLangCode,
              pangeaMessageEvent!.messageDisplayRepresentation!.tokens!,
            )
          : null;

  bool get messageInUserL2 =>
      pangeaMessageEvent?.messageDisplayLangCode ==
      MatrixState.pangeaController.languageController.userL2?.langCode;

  PangeaToken? get selectedToken =>
      pangeaMessageEvent?.messageDisplayRepresentation?.tokens
          ?.firstWhereOrNull(isTokenSelected);

  /// Whether the overlay is currently displaying a selection
  bool get isSelection => _selectedSpan != null || _highlightedTokens != null;

  PangeaTokenText? get selectedSpan => _selectedSpan;

  ///////////////////////////////////
  /// Functions
  /////////////////////////////////////

  /// If sentence TTS is playing a word, highlight that word in message overlay
  void highlightCurrentText(int currentPosition, List<TTSToken> ttsTokens) {
    final List<TTSToken> textToSelect = [];
    // Check if current time is between start and end times of tokens
    for (final TTSToken token in ttsTokens) {
      if (token.endMS > currentPosition) {
        if (token.startMS < currentPosition) {
          textToSelect.add(token);
        } else {
          break;
        }
      }
    }

    if (const ListEquality().equals(textToSelect, _highlightedTokens)) return;
    _highlightedTokens =
        textToSelect.isEmpty ? null : textToSelect.map((t) => t.text).toList();
    setState(() {});
  }

  Future<RepresentationEvent?> _fetchNewRepEvent() async {
    final RepresentationEvent? repEvent =
        pangeaMessageEvent?.messageDisplayRepresentation;

    if (repEvent != null) return repEvent;
    final eventID =
        await pangeaMessageEvent?.representationByDetectedLanguage();

    if (eventID == null) return null;
    final event = await widget._event.room.getEventById(eventID);
    if (event == null) return null;
    return RepresentationEvent(
      timeline: pangeaMessageEvent!.timeline,
      parentMessageEvent: pangeaMessageEvent!.event,
      event: event,
    );
  }

  /// When an activity is completed, we need to update the state
  /// and check if the toolbar should be unlocked
  void onActivityFinish(ActivityTypeEnum activityType, PangeaToken? token) {
    // if (selectedToken == null) {
    //   updateToolbarMode(MessageMode.noneSelected);
    // }

    if (!mounted) return;
    setState(() {});
  }

  /// In some cases, we need to exit the practice flow and let the user
  /// interact with the toolbar without completing activities
  void exitPracticeFlow() {
    practiceSelection?.exitPracticeFlow();
    setState(() {});
  }

  void onClickOverlayMessageToken(
    PangeaToken token,
  ) {
    if (practiceSelection?.hasHiddenWordActivity == true) {
      return;
    }

    /// we don't want to associate the audio with the text in this mode
    if (practiceSelection?.hasActiveActivityByToken(
          ActivityTypeEnum.wordFocusListening,
          token,
        ) ==
        false) {
      widget.chatController.choreographer.tts.tryToSpeak(
        token.text.content,
        context,
        targetID: null,
        langCode: pangeaMessageEvent?.messageDisplayLangCode,
      );
    }

    _updateSelectedSpan(token.text);
  }

  /// Whether the given token is currently selected or highlighted
  bool isTokenSelected(PangeaToken token) {
    final isSelected = _selectedSpan?.offset == token.text.offset &&
        _selectedSpan?.length == token.text.length;
    return isSelected;
  }

  bool isTokenHighlighted(PangeaToken token) {
    if (_highlightedTokens == null) return false;
    return _highlightedTokens!.any(
      (t) => t.offset == token.text.offset && t.length == token.text.length,
    );
  }

  void setIsPlayingAudio(bool isPlaying) {
    if (mounted) {
      setState(() => isPlayingAudio = isPlaying);
    }
  }

  /////////////////////////////////////
  /// Build
  /////////////////////////////////////
  @override
  Widget build(BuildContext context) {
    return MessageSelectionPositioner(
      overlayController: this,
      chatController: widget.chatController,
      event: widget._event,
      nextEvent: widget._nextEvent,
      prevEvent: widget._prevEvent,
      pangeaMessageEvent: pangeaMessageEvent,
      initialSelectedToken: widget._initialSelectedToken,
    );
  }
}