import 'package:flutter/material.dart';

import 'package:go_router/go_router.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:matrix/matrix.dart' as sdk;
import 'package:matrix/matrix.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/config/themes.dart';
import 'package:fluffychat/l10n/l10n.dart';
import 'package:fluffychat/pages/chat_list/chat_list_item.dart';
import 'package:fluffychat/pangea/analytics_summary/learning_progress_indicators.dart';
import 'package:fluffychat/pangea/chat_settings/widgets/chat_context_menu_action.dart';
import 'package:fluffychat/pangea/course_chats/activity_template_chat_list_item.dart';
import 'package:fluffychat/pangea/course_chats/course_chats_page.dart';
import 'package:fluffychat/pangea/course_chats/course_default_chats_enum.dart';
import 'package:fluffychat/pangea/course_chats/unjoined_chat_list_item.dart';
import 'package:fluffychat/pangea/space_analytics/analytics_request_indicator.dart';
import 'package:fluffychat/pangea/spaces/knocking_users_indicator.dart';
import 'package:fluffychat/utils/stream_extension.dart';
import 'package:fluffychat/widgets/future_loading_dialog.dart';

class CourseChatsView extends StatelessWidget {
  final CourseChatsController controller;
  const CourseChatsView(
    this.controller, {
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    final room = controller.room;
    if (room == null) {
      return const Center(
        child: Icon(
          Icons.search_outlined,
          size: 80,
        ),
      );
    }

    return StreamBuilder(
      stream: room.client.onSync.stream
          .where((s) => s.hasRoomUpdate)
          .rateLimit(const Duration(seconds: 1)),
      builder: (context, snapshot) {
        final joinedChats = controller.joinedChats;
        final joinedSessions = controller.joinedActivities();

        final discoveredGroupChats = controller.discoveredGroupChats;
        final discoveredSessions =
            controller.discoveredActivities().entries.toList();

        final isColumnMode = FluffyThemes.isColumnMode(context);
        return Padding(
          padding: isColumnMode
              ? const EdgeInsets.only(
                  top: 12.0,
                  left: 8.0,
                  right: 8.0,
                )
              : const EdgeInsets.all(0.0),
          child: ListView.builder(
            shrinkWrap: true,
            itemCount: joinedChats.length +
                joinedSessions.length +
                discoveredGroupChats.length +
                discoveredSessions.length +
                9,
            itemBuilder: (context, i) {
              // courses chats title
              if (i == 0) {
                if (isColumnMode) {
                  return const Padding(
                    padding: EdgeInsets.symmetric(
                      vertical: 4.0,
                      horizontal: 8.0,
                    ),
                    child: Column(
                      spacing: 12.0,
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        LearningProgressIndicators(),
                        Icon(
                          Icons.chat_bubble_outline,
                          size: 30.0,
                        ),
                        SizedBox(height: 12.0),
                      ],
                    ),
                  );
                }

                return const SizedBox();
              }
              i--;

              if (i == 0) {
                return KnockingUsersIndicator(room: room);
              }
              i--;

              if (i == 0) {
                return AnalyticsRequestIndicator(room: room);
              }
              i--;

              if (i == 0) {
                return _DefaultChatCreationTile(
                  type: CourseDefaultChatsEnum.introductions,
                  controller: controller,
                );
              }
              i--;

              if (i == 0) {
                return _DefaultChatCreationTile(
                  type: CourseDefaultChatsEnum.announcements,
                  controller: controller,
                );
              }
              i--;

              // joined group chats
              if (i < joinedChats.length) {
                final joinedRoom = joinedChats[i];
                return ChatListItem(
                  joinedRoom,
                  onTap: () => controller.onChatTap(joinedRoom),
                  onLongPress: (c) => chatContextMenuAction(
                    joinedRoom,
                    c,
                    context,
                    () => controller.onChatTap(joinedRoom),
                  ),
                  activeChat: controller.widget.activeChat == joinedRoom.id,
                );
              }
              i -= joinedChats.length;

              // unjoined group chats
              if (i < discoveredGroupChats.length) {
                return UnjoinedChatListItem(
                  chunk: discoveredGroupChats[i],
                  onTap: () =>
                      controller.joinChildRoom(discoveredGroupChats[i]),
                );
              }
              i -= discoveredGroupChats.length;

              if (i == 0) {
                return joinedSessions.isEmpty && discoveredSessions.isEmpty
                    ? ListTile(
                        leading: const Icon(Icons.map_outlined),
                        title: Text(L10n.of(context).whatNow),
                        subtitle: Text(L10n.of(context).chooseNextActivity),
                        trailing: const Icon(Icons.arrow_forward),
                        onTap: () => context.pushReplacement(
                          "/rooms/spaces/${room.id}/details?tab=course",
                        ),
                      )
                    : const SizedBox();
              }
              i--;

              if (i == 0) {
                return joinedSessions.isEmpty
                    ? const SizedBox()
                    : Padding(
                        padding: const EdgeInsets.only(
                          top: 20.0,
                          bottom: 4.0,
                        ),
                        child: Text(
                          L10n.of(context).myActivities,
                          style: const TextStyle(fontSize: 12.0),
                          textAlign: TextAlign.center,
                        ),
                      );
              }
              i--;

              // joined activity sessions
              if (i < joinedSessions.length) {
                final joinedRoom = joinedSessions[i];
                return ChatListItem(
                  joinedRoom,
                  onTap: () => controller.onChatTap(joinedRoom),
                  onLongPress: (c) => chatContextMenuAction(
                    joinedRoom,
                    c,
                    context,
                    () => controller.onChatTap(joinedRoom),
                  ),
                  activeChat: controller.widget.activeChat == joinedRoom.id,
                  borderRadius: BorderRadius.circular(
                    AppConfig.borderRadius / 2,
                  ),
                );
              }
              i -= joinedSessions.length;

              if (i == 0) {
                return discoveredSessions.isEmpty
                    ? const SizedBox()
                    : Padding(
                        padding: const EdgeInsets.only(
                          top: 20.0,
                          bottom: 4.0,
                        ),
                        child: Text(
                          L10n.of(context).openToJoin,
                          style: const TextStyle(fontSize: 12.0),
                          textAlign: TextAlign.center,
                        ),
                      );
              }
              i--;

              // unjoined activity sessions
              if (i < discoveredSessions.length) {
                final activity = discoveredSessions[i].key;
                final sessions = discoveredSessions[i].value;
                return ActivityTemplateChatListItem(
                  space: room,
                  sessions: sessions,
                  joinActivity: (e) => controller.joinActivity(activity, e),
                );
              }
              i -= discoveredSessions.length;

              if (controller.noMoreRooms) {
                return const SizedBox();
              }

              return Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: 12.0,
                  vertical: 2.0,
                ),
                child: TextButton(
                  onPressed:
                      controller.isLoading ? null : controller.loadHierarchy,
                  child: controller.isLoading
                      ? LinearProgressIndicator(
                          borderRadius: BorderRadius.circular(
                            AppConfig.borderRadius,
                          ),
                        )
                      : Text(L10n.of(context).loadMore),
                ),
              );
            },
          ),
        );
      },
    );
  }
}

class _DefaultChatCreationTile extends StatelessWidget {
  final CourseDefaultChatsEnum type;
  final CourseChatsController controller;

  const _DefaultChatCreationTile({
    required this.type,
    required this.controller,
  });

  @override
  Widget build(BuildContext context) {
    if (!controller.showDefaultChatCreation(type)) {
      return const SizedBox();
    }

    final l10n = L10n.of(context);
    return ListTile(
      leading: const Icon(Symbols.chat_add_on),
      title: Text(type.creationTitle(l10n)),
      subtitle: Text(type.creationDesc(l10n)),
      trailing: IconButton(
        icon: const Icon(Icons.close),
        onPressed: () => showFutureLoadingDialog(
          context: context,
          future: () => controller.dismissDefaultChatCreation(type),
        ),
      ),
      onTap: () => showFutureLoadingDialog(
        context: context,
        future: () => controller.createDefaultChat(type),
      ),
    );
  }
}