import 'dart:async';

import 'package:fluffychat/pangea/constants/pangea_event_types.dart';
import 'package:fluffychat/pangea/extensions/client_extension/client_extension.dart';
import 'package:fluffychat/pangea/extensions/pangea_room_extension/pangea_room_extension.dart';
import 'package:fluffychat/pangea/models/analytics/analytics_event.dart';
import 'package:fluffychat/pangea/models/language_model.dart';
import 'package:fluffychat/pangea/pages/analytics/base_analytics_view.dart';
import 'package:fluffychat/pangea/pages/analytics/student_analytics/student_analytics.dart';
import 'package:flutter/material.dart';
import 'package:future_loading_dialog/future_loading_dialog.dart';
import 'package:matrix/matrix.dart';

import '../../../widgets/matrix.dart';
import '../../controllers/pangea_controller.dart';
import '../../enum/bar_chart_view_enum.dart';
import '../../enum/time_span.dart';
import '../../models/analytics/chart_analytics_model.dart';

class BaseAnalyticsPage extends StatefulWidget {
  final String pageTitle;
  final List<TabData> tabs;
  final BarChartViewSelection? selectedView;

  final AnalyticsSelected defaultSelected;
  final AnalyticsSelected? alwaysSelected;
  final StudentAnalyticsController? myAnalyticsController;
  final List<LanguageModel> targetLanguages;

  BaseAnalyticsPage({
    super.key,
    required this.pageTitle,
    required this.tabs,
    required this.alwaysSelected,
    required this.defaultSelected,
    this.selectedView,
    this.myAnalyticsController,
    targetLanguages,
  }) : targetLanguages = (targetLanguages?.isNotEmpty ?? false)
            ? targetLanguages
            : MatrixState.pangeaController.pLanguageStore.targetOptions;

  @override
  State<BaseAnalyticsPage> createState() => BaseAnalyticsController();
}

class BaseAnalyticsController extends State<BaseAnalyticsPage> {
  final PangeaController pangeaController = MatrixState.pangeaController;
  AnalyticsSelected? selected;
  String? currentLemma;
  ChartAnalyticsModel? chartData;
  StreamController refreshStream = StreamController.broadcast();

  bool isSelected(String chatOrStudentId) => chatOrStudentId == selected?.id;

  Room? get activeSpace {
    if (widget.defaultSelected.type == AnalyticsEntryType.space) {
      return Matrix.of(context).client.getRoomById(widget.defaultSelected.id);
    }
    return null;
  }

  @override
  void initState() {
    super.initState();
    if (widget.defaultSelected.type == AnalyticsEntryType.student) {
      runFirstRefresh();
    }
    setChartData();
  }

  @override
  void didUpdateWidget(covariant BaseAnalyticsPage oldWidget) {
    // when a user is a parent space's analytics and clicks on a subspace
    super.didUpdateWidget(oldWidget);
    if (oldWidget.defaultSelected.id != widget.defaultSelected.id) {
      setChartData();
      refreshStream.add(false);
    }
  }

  Future<void> runFirstRefresh() async {
    final analyticsRooms =
        pangeaController.matrixState.client.allMyAnalyticsRooms;

    final List<AnalyticsEvent> analyticsEvent = [];
    for (final analyticsRoom in analyticsRooms) {
      final lastSummaryEvent = await analyticsRoom.getLastAnalyticsEvent(
        PangeaEventTypes.summaryAnalytics,
        Matrix.of(context).client.userID!,
      );
      final lastConstructEvent = await analyticsRoom.getLastAnalyticsEvent(
        PangeaEventTypes.construct,
        Matrix.of(context).client.userID!,
      );
      if (lastSummaryEvent != null) {
        analyticsEvent.add(lastSummaryEvent);
      }
      if (lastConstructEvent != null) {
        analyticsEvent.add(lastConstructEvent);
      }
    }

    if (analyticsEvent.isNotEmpty) return;
    onRefresh();
  }

  Future<void> onRefresh() async {
    // postframe callback to avoid calling this function during build
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      await showFutureLoadingDialog(
        context: context,
        future: () async {
          debugPrint("updating analytics");
          await pangeaController.myAnalytics.updateAnalytics();
          await setChartData(forceUpdate: true);
          refreshStream.add(true);
        },
      );
    });
  }

  Future<ChartAnalyticsModel> fetchChartData(
    AnalyticsSelected? params, {
    forceUpdate = false,
  }) async {
    final ChartAnalyticsModel data =
        await pangeaController.analytics.getAnalytics(
      defaultSelected: widget.defaultSelected,
      selected: params,
      forceUpdate: forceUpdate,
    );

    return data;
  }

  Future<void> setChartData({forceUpdate = false}) async {
    final ChartAnalyticsModel newData = await fetchChartData(
      selected,
      forceUpdate: forceUpdate,
    );
    setState(() => chartData = newData);
  }

  TimeSpan get currentTimeSpan =>
      pangeaController.analytics.currentAnalyticsTimeSpan;

  Future<void> toggleSelection(AnalyticsSelected selectedParam) async {
    setState(() {
      debugPrint("selectedParam.id is ${selectedParam.id}");
      currentLemma = null;
      selected = isSelected(selectedParam.id) ? null : selectedParam;
    });
    await setChartData();
    refreshStream.add(false);
    Future.delayed(Duration.zero, () => setState(() {}));
  }

  Future<void> toggleTimeSpan(BuildContext context, TimeSpan timeSpan) async {
    await pangeaController.analytics.setCurrentAnalyticsTimeSpan(timeSpan);
    await setChartData();
    refreshStream.add(false);
  }

  Future<void> toggleSpaceLang(LanguageModel lang) async {
    await pangeaController.analytics.setCurrentAnalyticsLang(lang);
    await setChartData();
    refreshStream.add(false);
  }

  void setCurrentLemma(String? lemma) {
    currentLemma = lemma;
    setState(() {});
    refreshStream.add(false);
  }

  @override
  Widget build(BuildContext context) {
    return BaseAnalyticsView(controller: this);
  }
}

class TabData {
  AnalyticsEntryType type;
  IconData icon;
  List<TabItem> items;
  bool allowNavigateOnSelect;

  TabData({
    required this.type,
    required this.items,
    required this.icon,
    this.allowNavigateOnSelect = true,
  });
}

class TabItem {
  Uri? avatar;
  String displayName;
  String id;

  TabItem({required this.avatar, required this.displayName, required this.id});
}

enum AnalyticsEntryType { student, room, space, privateChats }

extension AnalyticsEntryTypeExtension on AnalyticsEntryType {
  String get route {
    switch (this) {
      case AnalyticsEntryType.student:
        return 'mylearning';
      case AnalyticsEntryType.space:
        return 'analytics';
      default:
        throw Exception('No route for $this');
    }
  }
}

class AnalyticsSelected {
  String id;
  AnalyticsEntryType type;
  String displayName;

  AnalyticsSelected(this.id, this.type, this.displayName);
}