// ignore_for_file: depend_on_referenced_packages

import 'package:flutter/material.dart';

import 'package:collection/collection.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:go_router/go_router.dart';
import 'package:matrix/matrix.dart';
import 'package:shimmer/shimmer.dart';

import 'package:fluffychat/config/themes.dart';
import 'package:fluffychat/l10n/l10n.dart';
import 'package:fluffychat/pages/chat_details/chat_details.dart';
import 'package:fluffychat/pangea/activity_planner/activity_plan_model.dart';
import 'package:fluffychat/pangea/activity_suggestions/activity_suggestion_card.dart';
import 'package:fluffychat/pangea/common/widgets/error_indicator.dart';
import 'package:fluffychat/pangea/common/widgets/url_image_widget.dart';
import 'package:fluffychat/pangea/course_creation/course_info_chip_widget.dart';
import 'package:fluffychat/pangea/course_plans/courses/course_plan_room_extension.dart';
import 'package:fluffychat/pangea/course_settings/pin_clipper.dart';
import 'package:fluffychat/pangea/course_settings/topic_participant_list.dart';
import 'package:fluffychat/pangea/events/constants/pangea_event_types.dart';
import 'package:fluffychat/widgets/matrix.dart';

class CourseSettings extends StatelessWidget {
  // final Room room;

  // /// The course ID to load, from the course plan event in the room.
  // /// Separate from the room to trigger didUpdateWidget on change
  // final String? courseId;
  final ChatDetailsController controller;

  const CourseSettings({
    super.key,
    required this.controller,
  });

  @override
  Widget build(BuildContext context) {
    if (controller.loadingCourse) {
      return const Center(child: CircularProgressIndicator.adaptive());
    }

    final room =
        Matrix.of(context).client.getRoomById(controller.widget.roomId);
    if (room == null || !room.isSpace) {
      return Center(
        child: Text(
          L10n.of(context).noCourseFound,
          textAlign: TextAlign.center,
          style: Theme.of(context).textTheme.bodyLarge,
        ),
      );
    }

    if (controller.course == null || controller.courseError != null) {
      return room.canChangeStateEvent(PangeaEventTypes.coursePlan)
          ? Column(
              spacing: 50.0,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  L10n.of(context).noCourseFound,
                  textAlign: TextAlign.center,
                  style: Theme.of(context).textTheme.bodyLarge,
                ),
                ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    backgroundColor:
                        Theme.of(context).colorScheme.primaryContainer,
                    foregroundColor:
                        Theme.of(context).colorScheme.onPrimaryContainer,
                  ),
                  onPressed: () => context
                      .go("/rooms/spaces/${controller.roomId}/addcourse"),
                  child: Row(
                    spacing: 8.0,
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      const Icon(Icons.map_outlined),
                      Text(L10n.of(context).addCoursePlan),
                    ],
                  ),
                ),
              ],
            )
          : Center(
              child: Text(
                L10n.of(context).noCourseFound,
                textAlign: TextAlign.center,
                style: Theme.of(context).textTheme.bodyLarge,
              ),
            );
    }

    final theme = Theme.of(context);
    final isColumnMode = FluffyThemes.isColumnMode(context);
    final double titleFontSize = isColumnMode ? 24.0 : 12.0;
    final double descFontSize = isColumnMode ? 12.0 : 8.0;
    final double iconSize = isColumnMode ? 16.0 : 12.0;

    if (controller.loadingTopics) {
      return const Center(child: CircularProgressIndicator.adaptive());
    }

    final activeTopicId = controller.currentTopicId(
      Matrix.of(context).client.userID!,
      controller.course!,
    );

    final int? topicIndex = activeTopicId == null
        ? null
        : controller.course!.topicIds.indexOf(activeTopicId);

    final Map<String, List<User>> userTopics = controller.loadingActivities
        ? {}
        : controller.topicsToUsers(
            room,
            controller.course!,
          );

    final teacherMode = room.isTeacherMode;

    return Column(
      spacing: isColumnMode ? 40.0 : 36.0,
      mainAxisSize: MainAxisSize.min,
      children: [
        ...controller.course!.topicIds.mapIndexed((index, topicId) {
          final topic = controller.course!.loadedTopics[topicId];
          if (topic == null) {
            return const SizedBox();
          }

          final usersInTopic = userTopics[topicId] ?? [];
          final activityError = controller.activityErrors[topicId];

          final bool locked =
              !teacherMode && (topicIndex == null ? false : index > topicIndex);

          final disabled =
              locked || controller.loadingActivities || activityError != null;

          return AbsorbPointer(
            absorbing: disabled,
            child: Opacity(
              opacity: disabled ? 0.5 : 1.0,
              child: Column(
                spacing: 12.0,
                mainAxisSize: MainAxisSize.min,
                children: [
                  LayoutBuilder(
                    builder: (context, constraints) {
                      return Row(
                        spacing: 8.0,
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Flexible(
                            child: Row(
                              spacing: 4.0,
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                Stack(
                                  children: [
                                    ClipPath(
                                      clipper: PinClipper(),
                                      child: ImageByUrl(
                                        imageUrl: topic.imageUrl,
                                        width: 54.0,
                                        replacement: Container(
                                          width: 54.0,
                                          height: 54.0,
                                          decoration: BoxDecoration(
                                            color: theme.colorScheme.secondary,
                                          ),
                                        ),
                                      ),
                                    ),
                                    if (locked)
                                      const Positioned(
                                        bottom: 0,
                                        right: 0,
                                        child: Icon(Icons.lock, size: 24.0),
                                      ),
                                  ],
                                ),
                                Flexible(
                                  child: Column(
                                    mainAxisSize: MainAxisSize.min,
                                    crossAxisAlignment:
                                        CrossAxisAlignment.start,
                                    children: [
                                      Text(
                                        topic.title,
                                        maxLines: 1,
                                        overflow: TextOverflow.ellipsis,
                                        style: TextStyle(
                                          fontSize: titleFontSize,
                                        ),
                                      ),
                                      if (topic.location != null)
                                        CourseInfoChip(
                                          icon: Icons.location_on,
                                          text: topic.location!,
                                          fontSize: descFontSize,
                                          iconSize: iconSize,
                                        ),
                                      if (constraints.maxWidth < 700.0)
                                        Padding(
                                          padding: const EdgeInsetsGeometry
                                              .symmetric(
                                            vertical: 4.0,
                                          ),
                                          child: TopicParticipantList(
                                            room: room,
                                            users: usersInTopic,
                                            avatarSize:
                                                isColumnMode ? 50.0 : 25.0,
                                            overlap: isColumnMode ? 20.0 : 8.0,
                                          ),
                                        ),
                                    ],
                                  ),
                                ),
                              ],
                            ),
                          ),
                          if (constraints.maxWidth >= 700.0)
                            TopicParticipantList(
                              room: room,
                              users: usersInTopic,
                              avatarSize: isColumnMode ? 50.0 : 25.0,
                              overlap: isColumnMode ? 20.0 : 8.0,
                            ),
                        ],
                      );
                    },
                  ),
                  if (!locked)
                    controller.loadingActivities
                        ? ActivityCardPlaceholder(
                            activityCount: topic.activityIds.length,
                          )
                        : activityError != null
                            ? ErrorIndicator(
                                message:
                                    L10n.of(context).oopsSomethingWentWrong,
                              )
                            : topic.loadedActivities.isNotEmpty
                                ? SizedBox(
                                    height: isColumnMode ? 290.0 : 210.0,
                                    child: TopicActivitiesList(
                                      room: room,
                                      activities: topic.loadedActivities,
                                      loading: controller.loadingCourseSummary,
                                      hasCompletedActivity:
                                          controller.hasCompletedActivity,
                                    ),
                                  )
                                : const SizedBox(),
                ],
              ),
            ),
          );
        }),
        const SizedBox(height: 16.0),
      ],
    );
  }
}

class ActivityCardPlaceholder extends StatelessWidget {
  final int activityCount;

  const ActivityCardPlaceholder({
    super.key,
    required this.activityCount,
  });

  @override
  Widget build(BuildContext context) {
    final int shimmerCount = activityCount;
    final theme = Theme.of(context);
    final isColumnMode = FluffyThemes.isColumnMode(context);

    return SizedBox(
      height: isColumnMode ? 290.0 : 210.0,
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemCount: shimmerCount,
        itemBuilder: (context, index) {
          return Padding(
            padding: const EdgeInsets.only(right: 24.0),
            child: Shimmer.fromColors(
              baseColor: theme.colorScheme.primary.withAlpha(20),
              highlightColor: theme.colorScheme.primary.withAlpha(50),
              child: Container(
                width: isColumnMode ? 160.0 : 120.0,
                height: isColumnMode ? 280.0 : 200.0,
                decoration: BoxDecoration(
                  color: theme.colorScheme.surfaceContainer,
                  borderRadius: BorderRadius.circular(12.0),
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}

class TopicActivitiesList extends StatefulWidget {
  final Room room;
  final Map<String, ActivityPlanModel> activities;
  final bool loading;
  final bool Function(String userId, String activityId) hasCompletedActivity;

  const TopicActivitiesList({
    super.key,
    required this.room,
    required this.activities,
    required this.loading,
    required this.hasCompletedActivity,
  });
  @override
  State<TopicActivitiesList> createState() => TopicActivitiesListState();
}

class TopicActivitiesListState extends State<TopicActivitiesList> {
  final ScrollController _scrollController = ScrollController();

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

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final isColumnMode = FluffyThemes.isColumnMode(context);

    final activityEntries = widget.activities.entries.toList();
    activityEntries.sort(
      (a, b) => a.value.req.numberOfParticipants.compareTo(
        b.value.req.numberOfParticipants,
      ),
    );

    return Scrollbar(
      thumbVisibility: true,
      controller: _scrollController,
      child: ListView.builder(
        controller: _scrollController,
        scrollDirection: Axis.horizontal,
        itemCount: activityEntries.length,
        itemBuilder: (context, index) {
          final activityEntry = activityEntries[index];
          final complete = widget.hasCompletedActivity(
            widget.room.client.userID!,
            activityEntry.key,
          );

          final activity = activityEntry.value;
          return Padding(
            padding: const EdgeInsets.only(right: 24.0),
            child: MouseRegion(
              cursor: SystemMouseCursors.click,
              child: GestureDetector(
                onTap: () => context.go(
                  "/rooms/spaces/${widget.room.id}/activity/${activityEntry.key}",
                ),
                child: Stack(
                  children: [
                    ActivitySuggestionCard(
                      activity: activity,
                      width: isColumnMode ? 160.0 : 120.0,
                      height: isColumnMode ? 280.0 : 200.0,
                      fontSize: isColumnMode ? 20.0 : 12.0,
                      fontSizeSmall: isColumnMode ? 12.0 : 8.0,
                      iconSize: isColumnMode ? 12.0 : 8.0,
                    ),
                    if (widget.loading)
                      Container(
                        width: isColumnMode ? 160.0 : 120.0,
                        height: isColumnMode ? 280.0 : 200.0,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(12.0),
                          color: theme.colorScheme.surface.withAlpha(180),
                        ),
                        child: const Center(
                          child: CircularProgressIndicator.adaptive(),
                        ),
                      )
                    else if (complete)
                      Container(
                        width: isColumnMode ? 160.0 : 120.0,
                        height: isColumnMode ? 280.0 : 200.0,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(12.0),
                          color: theme.colorScheme.surface.withAlpha(180),
                        ),
                        child: Center(
                          child: SvgPicture.asset(
                            "assets/pangea/check.svg",
                            width: 48.0,
                            height: 48.0,
                          ),
                        ),
                      ),
                  ],
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}