// biome-ignore format: keep compact to stay within file size limit
import * as React from "react";
import { FeatureGate } from "@/shared/features";
import { SidebarDndContext } from "@/features/sidebar/ui/SidebarDnd";

import type { LeaveCommunityResult } from "@/features/communities/leaveCommunity";
import type { Community } from "@/features/communities/types";
import { AddCommunityDialog } from "@/features/communities/ui/AddCommunityDialog";
import type { AddCommunityPrefillRequest } from "@/features/communities/addCommunityPrefill";
import { useIsMobile } from "@/shared/hooks/use-mobile";
import { useDeferredLoad } from "@/shared/hooks/useDeferredStartup";
import {
  useChannelSections,
  type ChannelSection,
} from "@/features/sidebar/lib/useChannelSections";
import { useActiveWorkingChannelsById } from "@/features/sidebar/lib/useActiveWorkingChannelsById";
import { useDmSidebarMetadata } from "@/features/sidebar/useDmSidebarMetadata";
import { sortDmChannelsForSidebar } from "@/features/sidebar/lib/dmSidebarSort";
import {
  sectionSortGroupKey,
  sortChannelsForSidebar,
} from "@/features/sidebar/lib/channelSortPreference";
import { useChannelSortPreference } from "@/features/sidebar/lib/useChannelSortPreference";
import { useSidebarScrollLock } from "@/features/sidebar/lib/useSidebarScrollLock";
import { isSidebarBackgroundTarget } from "@/features/sidebar/lib/sidebarBackgroundTarget";
import { useSidebarActivityOverflow } from "@/features/sidebar/lib/useSidebarActivityOverflow";
import {
  CreateSectionDialog,
  DeleteSectionAlertDialog,
  RenameSectionDialog,
  useDeleteChannelDialog,
  useLeaveChannelDialog,
  type SectionDialogValue,
} from "@/features/sidebar/ui/ChannelSectionDialogs";
import {
  AppSidebarPinnedHeader,
  AppSidebarPrimaryMenu,
} from "@/features/sidebar/ui/AppSidebarPinnedHeader";
import { MoreUnreadButton } from "@/features/sidebar/ui/MoreUnreadButton";
import { SidebarSection } from "@/features/sidebar/ui/SidebarSection";
import {
  ChannelGroupSection,
  CustomChannelSection,
  SectionActionsMenu,
  SectionQuickAction,
} from "@/features/sidebar/ui/CustomChannelSection";
import { CreateChannelDialog } from "@/features/sidebar/ui/CreateChannelDialog";
import { SidebarProfileCard } from "@/features/sidebar/ui/SidebarProfileCard";
import { HuddleProfileControl } from "@/features/huddle";
import type {
  CollapsibleSidebarGroup,
  CreateChannelKind,
} from "@/features/sidebar/ui/AppSidebar.types";
import { SidebarRelayConnectionCard } from "@/features/sidebar/ui/SidebarRelayConnectionCard";
import type { useSidebarRelayConnectionCard } from "@/features/sidebar/ui/useSidebarRelayConnectionCard";
import {
  SidebarLoadingContent,
  useSidebarLoadingShape,
} from "@/features/sidebar/ui/sidebarLoadingSkeleton";
import { useDeferredModalOpen } from "@/shared/ui/deferredModalOpen";
import { SidebarUpdateCard } from "@/features/settings/SidebarUpdateCard";
import { useUpdaterContext } from "@/features/settings/hooks/UpdaterProvider";
import { shouldShowSidebarUpdateCard } from "@/features/settings/sidebarUpdateCardVisibility";
import type { SettingsSection } from "@/features/settings/ui/SettingsPanels";
import type {
  Channel,
  ChannelVisibility,
  PresenceStatus,
  Profile,
  SearchHit,
  UserStatus,
} from "@/shared/api/types";
import {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarMenu,
  SidebarMenuItem,
  SidebarRail,
  useSidebar,
} from "@/shared/ui/sidebar";

type AppSidebarProps = {
  addCommunityPrefill?: AddCommunityPrefillRequest | null;
  activeCommunity: Community | null;
  channels: Channel[];
  currentPubkey?: string;
  fallbackDisplayName?: string;
  homeBadgeCount: number;
  isAddCommunityOpen?: boolean;
  isLoading: boolean;
  isCreatingChannel: boolean;
  isCreatingForum: boolean;
  profile?: Profile;
  relayConnectionCard: ReturnType<typeof useSidebarRelayConnectionCard>;
  selfPresenceStatus: PresenceStatus;
  errorMessage?: string;
  selectedChannelId: string | null;
  selectedView:
    | "home"
    | "channel"
    | "messages"
    | "agents"
    | "workflows"
    | "pulse"
    | "projects";
  unreadChannelCounts: ReadonlyMap<string, number>;
  unreadChannelIds: ReadonlySet<string>;
  previewActivityChannelIds: ReadonlySet<string>;
  communities: Community[];
  onAddCommunity: (community: Community) => void;
  onAddCommunityOpenChange?: (open: boolean) => void;
  onCreateChannel: (input: {
    name: string;
    description?: string;
    visibility: ChannelVisibility;
    ttlSeconds?: number;
    templateId?: string;
  }) => Promise<void>;
  onCreateForum: (input: {
    name: string;
    description?: string;
    visibility: ChannelVisibility;
    ttlSeconds?: number;
    templateId?: string;
  }) => Promise<void>;
  onOpenAddCommunity: () => void;
  onSendFeedback?: () => void;
  onHideDm: (channelId: string) => void;
  onMarkChannelUnread: (channelId: string) => void;
  onMarkChannelRead: (
    channelId: string,
    lastMessageAt: string | null | undefined,
  ) => void;
  onMarkAllChannelsRead: () => void;
  onBrowseChannels?: (onCreated?: (channelId: string) => void) => void;
  onOpenDm: (input: { pubkeys: string[] }) => Promise<void>;
  onUpdateCommunity: (
    id: string,
    updates: Partial<Pick<Community, "name" | "relayUrl" | "token">>,
  ) => void;
  onRemoveCommunity: (id: string) => Promise<LeaveCommunityResult | undefined>;
  onCreateAgent: () => void;
  onSelectAgents: () => void;
  onSelectProjects: () => void;
  onSelectPulse: () => void;
  onSelectWorkflows: () => void;
  onSelectHome: () => void;
  onSelectChannel: (channelId: string) => void;
  onOpenSearchResult: (hit: SearchHit) => void;
  /** Full channel set for global search, including channels outside the joined sidebar list. */
  searchChannels: Channel[];
  searchFocusRequests: readonly [global: number, channel: number];
  onSelectSettings: (section?: SettingsSection) => void;
  onSetPresenceStatus?: (status: "online" | "away" | "offline") => void;
  onSetUserStatus: (text: string, emoji: string) => void;
  onClearUserStatus: () => void;
  onSwitchCommunity: (id: string) => void;
  selfUserStatus?: UserStatus;
  isPresencePending?: boolean;
  onNewMessage: () => void;
  onBackgroundClick?: () => void;
  isCreateChannelOpen?: boolean;
  isHuddleCompanionOpen?: boolean;
  onHuddleEnded?: (ephemeralChannelId: string | null) => void;
  onCreateChannelOpenChange?: (open: boolean) => void;
  mutedChannelIds?: ReadonlySet<string>;
  onMuteChannel?: (channelId: string) => void;
  onUnmuteChannel?: (channelId: string) => void;
  starredChannelIds?: ReadonlySet<string>;
  onStarChannel?: (channelId: string) => void;
  onUnstarChannel?: (channelId: string) => void;
};

export function AppSidebar({
  addCommunityPrefill,
  activeCommunity,
  channels,
  currentPubkey,
  fallbackDisplayName,
  homeBadgeCount,
  onBackgroundClick,
  isAddCommunityOpen,
  isLoading,
  isCreatingChannel,
  isCreatingForum,
  profile,
  relayConnectionCard,
  selfPresenceStatus,
  errorMessage,
  selectedChannelId,
  selectedView,
  unreadChannelCounts,
  unreadChannelIds,
  previewActivityChannelIds,
  communities,
  onAddCommunity,
  onAddCommunityOpenChange,
  onCreateChannel,
  onCreateForum,
  onOpenAddCommunity,
  onSendFeedback,
  onHideDm,
  onMarkChannelUnread,
  onMarkChannelRead,
  onMarkAllChannelsRead,
  onBrowseChannels,
  onOpenDm,
  onUpdateCommunity,
  onRemoveCommunity,
  onCreateAgent,
  onSelectAgents,
  onSelectProjects,
  onSelectPulse,
  onSelectWorkflows,
  onSelectHome,
  onSelectChannel,
  onOpenSearchResult,
  searchChannels,
  searchFocusRequests,
  onSelectSettings,
  onSetPresenceStatus,
  onSetUserStatus,
  onClearUserStatus,
  onSwitchCommunity,
  selfUserStatus,
  isPresencePending,
  onNewMessage,
  isCreateChannelOpen: isCreateChannelOpenProp,
  isHuddleCompanionOpen = false,
  onHuddleEnded,
  onCreateChannelOpenChange,
  mutedChannelIds,
  onMuteChannel,
  onUnmuteChannel,
  starredChannelIds,
  onStarChannel,
  onUnstarChannel,
}: AppSidebarProps) {
  const activeWorkingByChannelId = useActiveWorkingChannelsById();
  const { status: updateStatus } = useUpdaterContext();
  const canShowSidebarUpdateCard = shouldShowSidebarUpdateCard(updateStatus);
  const { open: sidebarOpen, openMobile } = useSidebar();
  const isMobile = useIsMobile();
  const [isSidebarUpdateCardDismissed, setIsSidebarUpdateCardDismissed] =
    React.useState(false);
  const showSidebarUpdateCard =
    canShowSidebarUpdateCard && !isSidebarUpdateCardDismissed;
  const [dmActionsMenuOpen, setDmActionsMenuOpen] = React.useState(false);
  const scrollRef = React.useRef<HTMLDivElement>(null);
  useSidebarScrollLock(scrollRef);
  // biome-ignore format: keep compact to stay within file size limit
  const { scrollToNextAbove, scrollToNextBelow, unreadAboveCount, unreadBelowCount, unreadAboveLabel, unreadBelowLabel } = useSidebarActivityOverflow({ activeWorkingByChannelId, previewActivityChannelIds, scrollRef, unreadChannelIds });

  React.useEffect(() => {
    const scrollElement = scrollRef.current;
    if (!scrollElement) return;

    const handleWheel = (event: WheelEvent) => {
      if (event.deltaY === 0) return;

      const maxScrollTop =
        scrollElement.scrollHeight - scrollElement.clientHeight;
      if (maxScrollTop <= 0) {
        event.preventDefault();
        event.stopPropagation();
        return;
      }

      const atTop = scrollElement.scrollTop <= 0;
      const atBottom = scrollElement.scrollTop >= maxScrollTop - 1;
      const scrollingPastTop = event.deltaY < 0 && atTop;
      const scrollingPastBottom = event.deltaY > 0 && atBottom;

      if (scrollingPastTop || scrollingPastBottom) {
        event.preventDefault();
        event.stopPropagation();
        scrollElement.scrollTop = scrollingPastTop ? 0 : maxScrollTop;
      }
    };

    scrollElement.addEventListener("wheel", handleWheel, {
      capture: true,
      passive: false,
    });
    return () => {
      scrollElement.removeEventListener("wheel", handleWheel, {
        capture: true,
      });
    };
  }, []);

  const [createDialogKind, setCreateDialogKind] =
    React.useState<CreateChannelKind | null>(null);
  const { openNextFrame: openModalNextFrame } = useDeferredModalOpen();
  const openCreateDialog = React.useCallback(
    (kind: CreateChannelKind) => {
      setCreateDialogKind(null);
      openModalNextFrame(() => setCreateDialogKind(kind));
    },
    [openModalNextFrame],
  );

  React.useEffect(() => {
    if (!canShowSidebarUpdateCard) {
      setIsSidebarUpdateCardDismissed(false);
    }
  }, [canShowSidebarUpdateCard]);

  // Allow the create-channel dialog to be opened from outside (e.g. the
  // ⌘⇧N global shortcut in AppShell), mirroring the controlled new-DM lift.
  // When the external flag flips on, open the "stream" create dialog; the
  // close direction is reported back via `onCreateChannelOpenChange` in the
  // dialog's `onOpenChange` below.
  React.useEffect(() => {
    if (isCreateChannelOpenProp) {
      openCreateDialog("stream");
    }
  }, [isCreateChannelOpenProp, openCreateDialog]);
  const [collapsedGroups, setCollapsedGroups] = React.useState<
    Record<CollapsibleSidebarGroup, boolean>
  >({
    starred: false,
    channels: false,
    forums: false,
    directMessages: false,
  });

  const toggleCollapsedGroup = React.useCallback(
    (group: CollapsibleSidebarGroup) => {
      setCollapsedGroups((current) => ({
        ...current,
        [group]: !current[group],
      }));
    },
    [],
  );

  const [collapsedSections, setCollapsedSections] = React.useState<
    Record<string, boolean>
  >({});
  const toggleCollapsedSection = React.useCallback((sectionId: string) => {
    setCollapsedSections((current) => ({
      ...current,
      [sectionId]: !current[sectionId],
    }));
  }, []);

  const {
    sections: channelSections,
    assignments: channelAssignments,
    createSection,
    renameSection,
    deleteSection,
    moveSectionUp,
    moveSectionDown,
    reorderSections,
    assignChannel,
    unassignChannel,
  } = useChannelSections(currentPubkey, activeCommunity?.relayUrl);

  const sectionIds = React.useMemo(
    () => channelSections.map((s) => s.id),
    [channelSections],
  );

  const { sortModeFor, setSortModeFor } = useChannelSortPreference(
    currentPubkey,
    activeCommunity?.relayUrl,
    sectionIds,
  );

  const [createSectionState, setCreateSectionState] = React.useState<{
    open: boolean;
    pendingChannelId: string | null;
  }>({ open: false, pendingChannelId: null });
  const [renameSectionTarget, setRenameSectionTarget] =
    React.useState<ChannelSection | null>(null);
  const [deleteSectionTarget, setDeleteSectionTarget] =
    React.useState<ChannelSection | null>(null);
  const { requestLeaveChannel, dialog: leaveChannelDialog } =
    useLeaveChannelDialog();
  const { requestDeleteChannel, dialog: deleteChannelDialog } =
    useDeleteChannelDialog((channel) => {
      if (channel.id === selectedChannelId) onSelectHome();
    });

  const streamChannels = React.useMemo(
    () => channels.filter((channel) => channel.channelType === "stream"),
    [channels],
  );

  const sectionBuckets = React.useMemo(() => {
    const bySection: Record<string, Channel[]> = {};
    const unassigned: Channel[] = [];
    const sectionIds = new Set(channelSections.map((s) => s.id));

    for (const channel of streamChannels) {
      if (starredChannelIds?.has(channel.id)) continue;
      const sectionId = channelAssignments[channel.id];
      if (sectionId && sectionIds.has(sectionId)) {
        if (!bySection[sectionId]) {
          bySection[sectionId] = [];
        }
        bySection[sectionId].push(channel);
      } else {
        unassigned.push(channel);
      }
    }
    // Apply each grouping's own sort preference; section membership itself
    // is untouched.
    for (const sectionId of Object.keys(bySection)) {
      bySection[sectionId] = sortChannelsForSidebar(
        bySection[sectionId],
        sortModeFor(sectionSortGroupKey(sectionId)),
      );
    }
    return {
      bySection,
      unassigned: sortChannelsForSidebar(unassigned, sortModeFor("channels")),
    };
  }, [
    streamChannels,
    channelSections,
    channelAssignments,
    starredChannelIds,
    sortModeFor,
  ]);

  const starredChannels = React.useMemo(() => {
    if (!starredChannelIds || starredChannelIds.size === 0) return [];
    return sortChannelsForSidebar(
      streamChannels.filter((channel) => starredChannelIds.has(channel.id)),
      sortModeFor("starred"),
    );
  }, [streamChannels, starredChannelIds, sortModeFor]);

  const handleCreateSectionForChannel = React.useCallback(
    (channelId: string) => {
      setCreateSectionState({ open: true, pendingChannelId: channelId });
    },
    [],
  );

  const handleCreateSectionConfirm = React.useCallback(
    (value: SectionDialogValue) => {
      const section = createSection(value.name, value.icon);
      if (!section) {
        return;
      }
      if (createSectionState.pendingChannelId) {
        assignChannel(createSectionState.pendingChannelId, section.id);
      }
      setCreateSectionState({ open: false, pendingChannelId: null });
    },
    [createSection, assignChannel, createSectionState.pendingChannelId],
  );

  const forumChannels = React.useMemo(
    () =>
      sortChannelsForSidebar(
        channels.filter((channel) => channel.channelType === "forum"),
        sortModeFor("forums"),
      ),
    [channels, sortModeFor],
  );
  const directMessages = React.useMemo(
    () => channels.filter((channel) => channel.channelType === "dm"),
    [channels],
  );
  const isSelectedDirectMessage =
    selectedView === "channel" &&
    directMessages.some((channel) => channel.id === selectedChannelId);
  const shouldLoadDmMetadata = useDeferredLoad({
    immediate: isSelectedDirectMessage,
    timeoutMs: 400,
  });
  const { dmChannelLabels, dmParticipantsByChannelId, dmPresenceByChannelId } =
    useDmSidebarMetadata({
      currentPubkey,
      directMessages,
      enabled: shouldLoadDmMetadata,
      fallbackDisplayName,
      profileDisplayName: profile?.displayName,
    });
  const sortedDirectMessages = React.useMemo(
    () =>
      sortDmChannelsForSidebar(
        directMessages,
        dmChannelLabels,
        sortModeFor("dms"),
      ),
    [directMessages, dmChannelLabels, sortModeFor],
  );
  const sidebarLoadingShape = useSidebarLoadingShape({
    activeCommunityId: activeCommunity?.id,
    currentPubkey,
    directMessages,
    dmChannelLabels,
    isLoading,
    streamChannels,
  });
  const resolvedDisplayName =
    profile?.displayName?.trim() ||
    fallbackDisplayName?.trim() ||
    "Current identity";
  const isCreatingAny =
    createDialogKind === "stream"
      ? isCreatingChannel
      : createDialogKind === "forum"
        ? isCreatingForum
        : false;

  const handleCreateFromDialog = React.useCallback(
    async (input: {
      name: string;
      description?: string;
      visibility: ChannelVisibility;
      ttlSeconds?: number;
      templateId?: string;
    }) => {
      if (createDialogKind === "stream") {
        await onCreateChannel(input);
      } else if (createDialogKind === "forum") {
        await onCreateForum(input);
      }
    },
    [createDialogKind, onCreateChannel, onCreateForum],
  );

  const handleOpenCreateChannel = React.useCallback(() => {
    if (onCreateChannelOpenChange) {
      onCreateChannelOpenChange(true);
      return;
    }

    openCreateDialog("stream");
  }, [onCreateChannelOpenChange, openCreateDialog]);

  const handleCreateChannelInSection = React.useCallback(
    (sectionId: string) => {
      onBrowseChannels?.((channelId) => assignChannel(channelId, sectionId));
    },
    [assignChannel, onBrowseChannels],
  );

  return (
    <Sidebar
      className="!z-[100] !border-r-0"
      collapsible="offcanvas"
      data-testid="app-sidebar"
      onClick={(event) => {
        if (isSidebarBackgroundTarget(event.target)) {
          onBackgroundClick?.();
        }
      }}
      variant="sidebar"
    >
      <div
        className={`relative flex min-h-0 flex-1 flex-col overflow-hidden ${
          communities.length > 1 ? "md:-ml-[11px] md:w-[calc(100%+11px)]" : ""
        }`}
        data-sidebar-background
        data-testid="app-sidebar-scroll-anchor"
      >
        <AppSidebarPinnedHeader
          channelLabels={dmChannelLabels}
          currentPubkey={currentPubkey}
          currentChannelId={
            selectedView === "channel" ? selectedChannelId : null
          }
          onBrowseChannels={onBrowseChannels}
          onCreateAgent={onCreateAgent}
          onCreateChannel={handleOpenCreateChannel}
          onOpenDm={onOpenDm}
          onOpenSearchResult={onOpenSearchResult}
          onSelectChannel={onSelectChannel}
          searchChannels={searchChannels}
          searchFocusRequest={searchFocusRequests[0]}
          scopeSearchFocusRequest={searchFocusRequests[1]}
          suggestionChannels={channels}
        />

        <div
          className="relative flex min-h-0 flex-1 flex-col"
          data-sidebar-background
          data-testid="sidebar-channel-content"
        >
          {unreadAboveCount > 0 ? (
            <MoreUnreadButton
              count={unreadAboveCount}
              label={unreadAboveLabel}
              onClick={scrollToNextAbove}
              position="top"
              testId="sidebar-more-unread-above"
            />
          ) : null}

          <SidebarContent
            className="buzz-sidebar-scrollbar overscroll-none"
            data-sidebar-background
            ref={scrollRef}
          >
            <div
              className="flex w-full flex-col gap-2 px-[3px]"
              data-sidebar-background
              data-testid="sidebar-scroll-content"
            >
              <AppSidebarPrimaryMenu
                homeBadgeCount={homeBadgeCount}
                onSelectAgents={onSelectAgents}
                onSelectHome={onSelectHome}
                onSelectProjects={onSelectProjects}
                onSelectPulse={onSelectPulse}
                onSelectWorkflows={onSelectWorkflows}
                selectedView={selectedView}
              />

              {isLoading ? (
                <SidebarLoadingContent shape={sidebarLoadingShape} />
              ) : null}

              {!isLoading ? (
                <>
                  {starredChannels.length > 0 ? (
                    <ChannelGroupSection
                      hasUnread={starredChannels.some((c) =>
                        unreadChannelIds.has(c.id),
                      )}
                      isCollapsed={collapsedGroups.starred}
                      isActiveChannel={selectedView === "channel"}
                      activeWorkingByChannelId={activeWorkingByChannelId}
                      items={starredChannels}
                      sortMode={sortModeFor("starred")}
                      onSortModeChange={(mode) =>
                        setSortModeFor("starred", mode)
                      }
                      actionsTestId="section-actions-starred"
                      listTestId="starred-list"
                      onMarkAllRead={() => {
                        for (const channel of starredChannels) {
                          onMarkChannelRead(channel.id, channel.lastMessageAt);
                        }
                      }}
                      onMarkChannelRead={onMarkChannelRead}
                      onMarkChannelUnread={onMarkChannelUnread}
                      onSelectChannel={onSelectChannel}
                      onToggleCollapsed={() => toggleCollapsedGroup("starred")}
                      selectedChannelId={selectedChannelId}
                      title="Starred"
                      unreadChannelCounts={unreadChannelCounts}
                      unreadChannelIds={unreadChannelIds}
                      mutedChannelIds={mutedChannelIds}
                      onMuteChannel={onMuteChannel}
                      onUnmuteChannel={onUnmuteChannel}
                      starredChannelIds={starredChannelIds}
                      onStarChannel={onStarChannel}
                      onUnstarChannel={onUnstarChannel}
                      onDeleteChannel={requestDeleteChannel}
                      onLeaveChannel={requestLeaveChannel}
                    />
                  ) : null}
                  <SidebarDndContext
                    channels={channels}
                    sections={channelSections}
                    sectionIds={sectionIds}
                    onAssignChannel={assignChannel}
                    onUnassignChannel={unassignChannel}
                    onReorderSections={reorderSections}
                  >
                    {channelSections.map((section, idx) => (
                      <CustomChannelSection
                        key={section.id}
                        section={section}
                        channels={sectionBuckets.bySection[section.id] ?? []}
                        hasUnread={
                          sectionBuckets.bySection[section.id]?.some((c) =>
                            unreadChannelIds.has(c.id),
                          ) ?? false
                        }
                        isCollapsed={collapsedSections[section.id] ?? false}
                        isActiveChannel={selectedView === "channel"}
                        activeWorkingByChannelId={activeWorkingByChannelId}
                        selectedChannelId={selectedChannelId}
                        unreadChannelCounts={unreadChannelCounts}
                        unreadChannelIds={unreadChannelIds}
                        sections={channelSections}
                        assignments={channelAssignments}
                        isFirst={idx === 0}
                        isLast={idx === channelSections.length - 1}
                        sortMode={sortModeFor(sectionSortGroupKey(section.id))}
                        onSortModeChange={(mode) =>
                          setSortModeFor(sectionSortGroupKey(section.id), mode)
                        }
                        onToggleCollapsed={() =>
                          toggleCollapsedSection(section.id)
                        }
                        onSelectChannel={onSelectChannel}
                        onMarkChannelRead={onMarkChannelRead}
                        onMarkChannelUnread={onMarkChannelUnread}
                        onMarkSectionRead={() => {
                          for (const channel of sectionBuckets.bySection[
                            section.id
                          ] ?? []) {
                            onMarkChannelRead(
                              channel.id,
                              channel.lastMessageAt,
                            );
                          }
                        }}
                        onAssignChannel={assignChannel}
                        onUnassignChannel={unassignChannel}
                        onCreateSectionForChannel={
                          handleCreateSectionForChannel
                        }
                        onCreateChannel={() =>
                          handleCreateChannelInSection(section.id)
                        }
                        onRenameSection={() => setRenameSectionTarget(section)}
                        onDeleteSection={() => setDeleteSectionTarget(section)}
                        onMoveSectionUp={() => moveSectionUp(section.id)}
                        onMoveSectionDown={() => moveSectionDown(section.id)}
                        mutedChannelIds={mutedChannelIds}
                        onMuteChannel={onMuteChannel}
                        onUnmuteChannel={onUnmuteChannel}
                        starredChannelIds={starredChannelIds}
                        onStarChannel={onStarChannel}
                        onUnstarChannel={onUnstarChannel}
                        onDeleteChannel={requestDeleteChannel}
                        onLeaveChannel={requestLeaveChannel}
                      />
                    ))}
                    <ChannelGroupSection
                      draggable
                      hasUnread={unreadChannelIds.size > 0}
                      isCollapsed={collapsedGroups.channels}
                      isActiveChannel={selectedView === "channel"}
                      activeWorkingByChannelId={activeWorkingByChannelId}
                      items={sectionBuckets.unassigned}
                      sortMode={sortModeFor("channels")}
                      onSortModeChange={(mode) =>
                        setSortModeFor("channels", mode)
                      }
                      actionsTestId="section-actions-channels"
                      listTestId="stream-list"
                      quickCreateLabel="Browse channels"
                      onQuickCreateClick={() => onBrowseChannels?.()}
                      showQuickCreate
                      onMarkAllRead={onMarkAllChannelsRead}
                      onMarkChannelRead={onMarkChannelRead}
                      onMarkChannelUnread={onMarkChannelUnread}
                      onSelectChannel={onSelectChannel}
                      onToggleCollapsed={() => toggleCollapsedGroup("channels")}
                      selectedChannelId={selectedChannelId}
                      title="Channels"
                      unreadChannelCounts={unreadChannelCounts}
                      unreadChannelIds={unreadChannelIds}
                      sections={channelSections}
                      assignments={channelAssignments}
                      onAssignChannel={assignChannel}
                      onUnassignChannel={unassignChannel}
                      onCreateSectionForChannel={handleCreateSectionForChannel}
                      mutedChannelIds={mutedChannelIds}
                      onMuteChannel={onMuteChannel}
                      onUnmuteChannel={onUnmuteChannel}
                      starredChannelIds={starredChannelIds}
                      onStarChannel={onStarChannel}
                      onUnstarChannel={onUnstarChannel}
                      onDeleteChannel={requestDeleteChannel}
                      onLeaveChannel={requestLeaveChannel}
                    />
                  </SidebarDndContext>
                  <FeatureGate feature="forum">
                    <ChannelGroupSection
                      createLabel="New forum"
                      hasUnread={unreadChannelIds.size > 0}
                      isCollapsed={collapsedGroups.forums}
                      isActiveChannel={selectedView === "channel"}
                      activeWorkingByChannelId={activeWorkingByChannelId}
                      items={forumChannels}
                      sortMode={sortModeFor("forums")}
                      onSortModeChange={(mode) =>
                        setSortModeFor("forums", mode)
                      }
                      actionsTestId="section-actions-forums"
                      listTestId="forum-list"
                      onCreateClick={() => openCreateDialog("forum")}
                      onMarkAllRead={onMarkAllChannelsRead}
                      onMarkChannelRead={onMarkChannelRead}
                      onMarkChannelUnread={onMarkChannelUnread}
                      onSelectChannel={onSelectChannel}
                      onToggleCollapsed={() => toggleCollapsedGroup("forums")}
                      selectedChannelId={selectedChannelId}
                      title="Forums"
                      unreadChannelCounts={unreadChannelCounts}
                      unreadChannelIds={unreadChannelIds}
                      mutedChannelIds={mutedChannelIds}
                      onMuteChannel={onMuteChannel}
                      onUnmuteChannel={onUnmuteChannel}
                      onDeleteChannel={requestDeleteChannel}
                    />
                  </FeatureGate>
                  <SidebarSection
                    action={
                      <div className="absolute right-1 top-1/2 z-10 flex -translate-y-1/2 items-center gap-0.5">
                        <SectionQuickAction
                          label="New message"
                          onClick={onNewMessage}
                          testId="section-actions-dms-quick-create"
                        />
                        <SectionActionsMenu
                          sectionLabel="direct messages"
                          testId="section-actions-dms"
                          onOpenChange={setDmActionsMenuOpen}
                          onNewMessage={onNewMessage}
                          sortMode={sortModeFor("dms")}
                          onSortModeChange={(mode) =>
                            setSortModeFor("dms", mode)
                          }
                        />
                      </div>
                    }
                    dmParticipantsByChannelId={dmParticipantsByChannelId}
                    isCollapsed={collapsedGroups.directMessages}
                    isActiveChannel={selectedView === "channel"}
                    activeWorkingByChannelId={activeWorkingByChannelId}
                    items={sortedDirectMessages}
                    channelLabels={dmChannelLabels}
                    onHideDm={onHideDm}
                    onMarkChannelRead={onMarkChannelRead}
                    onMarkChannelUnread={onMarkChannelUnread}
                    onSelectChannel={onSelectChannel}
                    onToggleCollapsed={() =>
                      toggleCollapsedGroup("directMessages")
                    }
                    presenceByChannelId={dmPresenceByChannelId}
                    selectedChannelId={selectedChannelId}
                    testId="dm-list"
                    title="Direct messages"
                    sectionActionsOpen={dmActionsMenuOpen}
                    unreadChannelCounts={unreadChannelCounts}
                    unreadChannelIds={unreadChannelIds}
                    mutedChannelIds={mutedChannelIds}
                    onMuteChannel={onMuteChannel}
                    onUnmuteChannel={onUnmuteChannel}
                  />
                </>
              ) : null}

              {errorMessage && !relayConnectionCard.hasRelayUnreachableError ? (
                <div className="px-3 py-2 text-sm text-destructive">
                  {errorMessage}
                </div>
              ) : null}
            </div>
          </SidebarContent>
        </div>

        <div className="relative z-30 shrink-0" data-buzz-glass-footer-wrap>
          {unreadBelowCount > 0 ? (
            <MoreUnreadButton
              bottomClassName="bottom-full"
              count={unreadBelowCount}
              label={unreadBelowLabel}
              onClick={scrollToNextBelow}
              position="bottom"
              testId="sidebar-more-unread-below"
            />
          ) : null}

          <SidebarFooter>
            {relayConnectionCard.showSidebarRelayConnectionCard &&
            (isMobile ? openMobile : sidebarOpen) ? (
              <SidebarRelayConnectionCard
                className="mb-2"
                isConnected={relayConnectionCard.isRelayConnectionSuccess}
                isReconnectPending={relayConnectionCard.isRelayReconnectPending}
                isWaitingOnReconnectHook={
                  relayConnectionCard.isWaitingOnReconnectHook
                }
                onDismiss={relayConnectionCard.onDismissRelayConnectionCard}
                onReconnect={relayConnectionCard.onReconnectRelay}
              />
            ) : null}
            {showSidebarUpdateCard ? (
              <div className="mb-2 group-data-[collapsible=icon]:hidden">
                <SidebarUpdateCard
                  onDismiss={() => setIsSidebarUpdateCardDismissed(true)}
                />
              </div>
            ) : null}
            <HuddleProfileControl
              channels={channels}
              onHuddleEnded={onHuddleEnded}
              visible={isHuddleCompanionOpen}
            />
            <SidebarMenu>
              <SidebarMenuItem>
                <SidebarProfileCard
                  activeCommunity={activeCommunity}
                  isPresencePending={isPresencePending}
                  onOpenAddCommunity={onOpenAddCommunity}
                  onOpenSettings={onSelectSettings}
                  onSendFeedback={onSendFeedback}
                  onRemoveCommunity={onRemoveCommunity}
                  onSetPresenceStatus={onSetPresenceStatus}
                  onSetUserStatus={onSetUserStatus}
                  onClearUserStatus={onClearUserStatus}
                  onSwitchCommunity={onSwitchCommunity}
                  onUpdateCommunity={onUpdateCommunity}
                  profile={profile}
                  resolvedDisplayName={resolvedDisplayName}
                  selfPresenceStatus={selfPresenceStatus}
                  selfUserStatus={selfUserStatus}
                  communities={communities}
                />
              </SidebarMenuItem>
            </SidebarMenu>
          </SidebarFooter>
        </div>
      </div>

      <CreateChannelDialog
        channelKind={createDialogKind}
        isCreating={isCreatingAny}
        onOpenChange={(open) => {
          if (!open) {
            // If a "stream" dialog driven by the external controller is
            // closing, report it back so AppShell's open state resets.
            if (createDialogKind === "stream") {
              onCreateChannelOpenChange?.(false);
            }
            setCreateDialogKind(null);
          }
        }}
        onCreate={handleCreateFromDialog}
      />

      <AddCommunityDialog
        prefill={addCommunityPrefill}
        onOpenChange={onAddCommunityOpenChange ?? (() => {})}
        onSubmit={onAddCommunity}
        open={isAddCommunityOpen ?? false}
      />

      <CreateSectionDialog
        open={createSectionState.open}
        onOpenChange={(open) => {
          if (!open) {
            setCreateSectionState({ open: false, pendingChannelId: null });
          }
        }}
        onConfirm={handleCreateSectionConfirm}
      />

      <RenameSectionDialog
        open={renameSectionTarget !== null}
        onOpenChange={(open) => {
          if (!open) setRenameSectionTarget(null);
        }}
        sectionName={renameSectionTarget?.name ?? ""}
        sectionIcon={renameSectionTarget?.icon}
        onConfirm={(value) => {
          if (renameSectionTarget) {
            renameSection(renameSectionTarget.id, value.name, value.icon);
          }
          setRenameSectionTarget(null);
        }}
      />

      <DeleteSectionAlertDialog
        open={deleteSectionTarget !== null}
        onOpenChange={(open) => {
          if (!open) setDeleteSectionTarget(null);
        }}
        sectionName={deleteSectionTarget?.name ?? ""}
        channelCount={
          deleteSectionTarget
            ? (sectionBuckets.bySection[deleteSectionTarget.id]?.length ?? 0)
            : 0
        }
        onConfirm={() => {
          if (deleteSectionTarget) {
            deleteSection(deleteSectionTarget.id);
            setCollapsedSections((prev) => {
              const next = { ...prev };
              delete next[deleteSectionTarget.id];
              return next;
            });
          }
          setDeleteSectionTarget(null);
        }}
      />
      {deleteChannelDialog}
      {leaveChannelDialog}
      <SidebarRail />
    </Sidebar>
  );
}