import { Fragment, memo, useCallback, useMemo } from 'react';

import { MarkdownViewer } from '@renderer/components/chat/viewers/MarkdownViewer';
import { CopyButton } from '@renderer/components/common/CopyButton';
import { AttachmentDisplay } from '@renderer/components/team/attachments/AttachmentDisplay';
import { MemberBadge } from '@renderer/components/team/MemberBadge';
import { TaskTooltip } from '@renderer/components/team/TaskTooltip';
import { ExpandableContent } from '@renderer/components/ui/ExpandableContent';
import { Tooltip, TooltipContent, TooltipTrigger } from '@renderer/components/ui/tooltip';
import {
  CARD_BG,
  CARD_BG_ZEBRA,
  CARD_BORDER_STYLE,
  CARD_ICON_MUTED,
  CARD_TEXT_LIGHT,
} from '@renderer/constants/cssVariables';
import { getTeamColorSet, getThemedBorder } from '@renderer/constants/teamColors';
import { useTheme } from '@renderer/hooks/useTheme';
import {
  getMessageTypeLabel,
  getStructuredMessageSummary,
  parseMessageReply,
  parseStructuredAgentMessage,
} from '@renderer/utils/agentMessageFormatting';
import { formatAgentRole } from '@renderer/utils/formatAgentRole';
import { linkifyAllMentionsInMarkdown } from '@renderer/utils/mentionLinkify';
import { cn } from '@renderer/lib/utils';
import {
  areInboxMessagesEquivalentForRender,
  areStringArraysEqual,
  areStringMapsEqual,
} from '@renderer/utils/messageRenderEquality';
import { linkifyTaskIdsInMarkdown, parseTaskLinkHref } from '@renderer/utils/taskReferenceUtils';
import { toMessageKey } from '@renderer/utils/teamMessageKey';
import { stripAgentBlocks } from '@shared/constants/agentBlocks';
import {
  CROSS_TEAM_SENT_SOURCE,
  CROSS_TEAM_SOURCE,
  parseCrossTeamPrefix,
  stripCrossTeamPrefix,
} from '@shared/constants/crossTeam';
import { extractMarkdownPlainText } from '@shared/utils/markdownTextSearch';
import { isRateLimitMessage } from '@shared/utils/rateLimitDetector';
import { formatTaskDisplayLabel } from '@shared/utils/taskIdentity';
import { AlertTriangle, ChevronRight, ListPlus, Maximize2, RefreshCw, Reply } from 'lucide-react';

import { ReplyQuoteBlock } from './ReplyQuoteBlock';

import type { TeamColorSet } from '@renderer/constants/teamColors';
import type { InboxMessage } from '@shared/types';

type StructuredMessage = Record<string, unknown>;

function parseQualifiedRecipient(
  value: string | undefined
): { teamName: string; memberName: string } | null {
  if (typeof value !== 'string') return null;
  const trimmed = value.trim();
  const dot = trimmed.indexOf('.');
  if (dot <= 0 || dot === trimmed.length - 1) return null;
  return {
    teamName: trimmed.slice(0, dot),
    memberName: trimmed.slice(dot + 1),
  };
}

function parseCrossTeamPseudoRecipient(value: string | undefined): string | null {
  if (typeof value !== 'string') return null;
  const trimmed = value.trim();
  if (!trimmed.startsWith('cross-team:')) return null;
  const teamName = trimmed.slice('cross-team:'.length).trim();
  return teamName.length > 0 ? teamName : null;
}

export function isQualifiedExternalRecipient(
  value: string | undefined,
  teamName: string,
  localMemberNames?: Set<string>
): boolean {
  const recipient = parseQualifiedRecipient(value);
  if (!recipient) return false;
  if (recipient.teamName === teamName) return false;
  return !localMemberNames?.has(value?.trim() ?? '');
}

export function getCrossTeamSentTarget(
  value: string | undefined,
  teamName: string,
  localMemberNames?: Set<string>
): string | null {
  const pseudoTarget = parseCrossTeamPseudoRecipient(value);
  if (pseudoTarget) return pseudoTarget;
  const recipient = parseQualifiedRecipient(value);
  if (!recipient) return null;
  if (recipient.teamName === teamName) return null;
  if (localMemberNames?.has(value?.trim() ?? '')) return null;
  return recipient.teamName;
}

export function getCrossTeamSentMemberName(value: string | undefined): string | null {
  return parseQualifiedRecipient(value)?.memberName ?? null;
}

function CrossTeamTeamBadge({
  teamName,
  onClick,
}: {
  teamName: string;
  onClick?: (teamName: string) => void;
}): React.JSX.Element {
  if (onClick) {
    return (
      <button
        type="button"
        className="inline-flex items-center rounded-full px-1.5 py-0.5 text-[10px] font-medium tracking-wide"
        style={{
          backgroundColor: 'rgba(168, 85, 247, 0.15)',
          color: '#c084fc',
          cursor: 'pointer',
          border: 'none',
          padding: '1px 6px',
        }}
        onClick={(e) => {
          e.stopPropagation();
          onClick(teamName);
        }}
      >
        {teamName}
      </button>
    );
  }
  return (
    <span
      className="inline-flex items-center rounded-full px-1.5 py-0.5 text-[10px] font-medium tracking-wide"
      style={{ backgroundColor: 'rgba(168, 85, 247, 0.15)', color: '#c084fc' }}
    >
      {teamName}
    </span>
  );
}

interface ActivityItemProps {
  message: InboxMessage;
  teamName: string;
  localMemberNames?: Set<string>;
  teamNames?: string[];
  memberRole?: string;
  memberColor?: string;
  recipientColor?: string;
  /** When true, show a blue unread dot. */
  isUnread?: boolean;
  /** Map of member name → color name for @mention badge rendering. */
  memberColorMap?: Map<string, string>;
  /** Team color mapping for team:// links rendered inside markdown. */
  teamColorByName?: ReadonlyMap<string, string>;
  /** Opens a team tab from cross-team badges or team:// links. */
  onTeamClick?: (teamName: string) => void;
  onMemberNameClick?: (memberName: string) => void;
  onCreateTask?: (subject: string, description: string) => void;
  onReply?: (message: InboxMessage) => void;
  /** Called when a task ID link (e.g. #10) is clicked in message text. */
  onTaskIdClick?: (taskId: string) => void;
  /** Called when the user clicks "Restart team" on an auth error message. */
  onRestartTeam?: () => void;
  /** When true, apply a subtle lighter background for zebra-striped lists. */
  zebraShade?: boolean;
  /** Collapsed-mode primitives stabilized by ActivityTimeline. */
  collapseMode?: 'default' | 'managed';
  isCollapsed?: boolean;
  canToggleCollapse?: boolean;
  collapseToggleKey?: string;
  onToggleCollapse?: (key: string) => void;
  /** Compact header mode for narrow message lists. */
  compactHeader?: boolean;
  /** Callback to expand this item into a fullscreen dialog. */
  onExpand?: (key: string) => void;
  /** Stable key for expand identification. */
  expandItemKey?: string;
}

function areMessagesEquivalentForActivityItem(prev: InboxMessage, next: InboxMessage): boolean {
  return areInboxMessagesEquivalentForRender(prev, next);
}

function getStringField(obj: StructuredMessage, key: string): string | null {
  const value = obj[key];
  return typeof value === 'string' && value.trim() !== '' ? value : null;
}

/** Check if a message renders as a compact noise row (idle, shutdown, etc.). */
export function isNoiseMessage(text: string): boolean {
  const parsed = parseStructuredAgentMessage(text);
  return parsed !== null && getNoiseLabel(parsed) !== null;
}

function getNoiseLabel(parsed: StructuredMessage): string | null {
  const type = getStringField(parsed, 'type');

  if (type === 'idle_notification') {
    const reason = getStringField(parsed, 'idleReason');
    return reason ? `Idle (${reason})` : 'Idle';
  }

  if (type === 'shutdown_response') {
    return parsed.approve === true ? 'Shut down' : 'Rejected shutdown';
  }

  if (type === 'shutdown_request') {
    return 'Shutdown requested';
  }

  if (type === 'shutdown_approved' || type === 'teammate_terminated') {
    return type === 'shutdown_approved' ? 'Shutdown confirmed' : 'Terminated';
  }

  if (type === 'task_completed') {
    const rawTaskId = parsed.taskId;
    const taskId =
      typeof rawTaskId === 'string' || typeof rawTaskId === 'number' ? rawTaskId : null;
    return taskId !== null
      ? `Completed task ${formatTaskDisplayLabel({ id: String(taskId) })}`
      : 'Completed a task';
  }

  return null;
}

// ---------------------------------------------------------------------------
// Compact noise row (idle, shutdown, terminated) — minimal dot + name + label
// ---------------------------------------------------------------------------

const NoiseRow = ({
  name,
  label,
  colors,
}: {
  name: string;
  label: string;
  colors: TeamColorSet;
}): React.JSX.Element => (
  <div className="flex items-center gap-2 px-3 py-1" style={{ opacity: 0.45 }}>
    <span className="size-2 shrink-0 rounded-full" style={{ backgroundColor: colors.border }} />
    <span className="text-[11px]" style={{ color: CARD_ICON_MUTED }}>
      {name}
    </span>
    <span className="text-[11px]" style={{ color: CARD_ICON_MUTED }}>
      {label}
    </span>
  </div>
);

// ---------------------------------------------------------------------------
// Detect historical system/automated messages that should be collapsed by default.
// These patterns are kept only for legacy compatibility with old inbox/session rows;
// new runtime behavior must not depend on exact legacy wording.
// ---------------------------------------------------------------------------

const SYSTEM_MESSAGE_PATTERNS: { pattern: RegExp; label: string }[] = [
  { pattern: /^New task assigned to you:/, label: 'Task assignment' },
  { pattern: /^Task #[A-Za-z0-9-]+\s+approved/, label: 'Task approved' },
  { pattern: /^Task #[A-Za-z0-9-]+\s+needs fixes/, label: 'Review changes requested' },
];

export function getSystemMessageLabel(text: string): string | null {
  for (const { pattern, label } of SYSTEM_MESSAGE_PATTERNS) {
    if (pattern.test(text)) return label;
  }
  return null;
}

/** Labels to highlight in task assignment / review messages (bold in markdown). */
const TASK_MESSAGE_LABELS = [
  'New task assigned to you:',
  'Description:',
  'Task approved',
  'Task needs fixes',
  'Review changes requested',
  'Changes requested:',
  'Comments:',
  'Reviewer:',
  'Related:',
  'Blocked by:',
  'Blocks:',
];

/** Make known structural labels bold in system/task messages. */
function highlightSystemLabels(text: string, isSystem: boolean): string {
  if (!isSystem) return text;
  let result = text;
  for (const label of TASK_MESSAGE_LABELS) {
    // Escape any regex-special chars in the label, match at line start or after newline
    const escaped = label.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
    result = result.replace(new RegExp(`(^|\\n)(${escaped})`, 'g'), '$1**$2**');
  }
  return result;
}

/** Detect authentication/authorization errors that may be resolved by restarting. */
const AUTH_ERROR_PATTERNS = [
  /OAuth token has expired/i,
  /API Error:\s*401/i,
  /authentication_error/i,
  /Failed to authenticate/i,
  /invalid.*api.key/i,
  /unauthorized/i,
];

// ---------------------------------------------------------------------------
// Full message card — left colored border, name badge, collapsible content
// ---------------------------------------------------------------------------

/** Render `#<task-display-id>` in plain text as clickable inline elements with TaskTooltip. */
function linkifyTaskIds(text: string, onClick: (taskId: string) => void): React.ReactNode[] {
  return text.split(/(#[A-Za-z0-9-]+\b)/g).map((part, i) => {
    const match = /^#([A-Za-z0-9-]+)$/.exec(part);
    if (!match) return <Fragment key={i}>{part}</Fragment>;
    const taskId = match[1];
    return (
      <TaskTooltip key={i} taskId={taskId}>
        <button
          type="button"
          className="inline cursor-pointer font-medium text-blue-600 hover:underline dark:text-blue-400"
          onClick={(e) => {
            e.stopPropagation();
            onClick(taskId);
          }}
        >
          {part}
        </button>
      </TaskTooltip>
    );
  });
}

export const ActivityItem = memo(
  function ActivityItem({
    message,
    teamName,
    localMemberNames,
    teamNames = [],
    memberRole,
    memberColor,
    recipientColor,
    isUnread,
    memberColorMap,
    teamColorByName,
    onTeamClick,
    onMemberNameClick,
    onCreateTask,
    onReply,
    onTaskIdClick,
    onRestartTeam,
    zebraShade,
    collapseMode = 'default',
    isCollapsed = false,
    canToggleCollapse = false,
    collapseToggleKey,
    onToggleCollapse,
    compactHeader = false,
    onExpand,
    expandItemKey,
  }: ActivityItemProps): React.JSX.Element {
    const colors = getTeamColorSet(memberColor ?? message.color ?? '');
    const { isLight } = useTheme();
    // Hide role when it matches the sender name (avoids "lead" badge + "Team Lead" text duplication)
    const formattedRole =
      memberRole && memberRole !== message.from ? formatAgentRole(memberRole) : null;

    const timestamp = useMemo(() => {
      if (Number.isNaN(Date.parse(message.timestamp))) return message.timestamp;
      const date = new Date(message.timestamp);
      const now = new Date();
      const isToday =
        date.getFullYear() === now.getFullYear() &&
        date.getMonth() === now.getMonth() &&
        date.getDate() === now.getDate();
      return isToday
        ? date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
        : date.toLocaleString();
    }, [message.timestamp]);

    const structured = parseStructuredAgentMessage(message.text);
    // Only flag agent messages as rate-limited, not user's own quotes
    const rateLimited = message.from !== 'user' && isRateLimitMessage(message.text);
    // Highlight messages containing API errors
    const isApiError = message.text.includes('API Error');
    // Detect auth errors that may be resolved by restarting the team
    const isAuthError = isApiError && AUTH_ERROR_PATTERNS.some((p) => p.test(message.text));
    // Never collapse rate limit messages as noise — they must be visible
    const noiseLabel = structured && !rateLimited ? getNoiseLabel(structured) : null;

    const systemLabel = !structured && !rateLimited ? getSystemMessageLabel(message.text) : null;
    const isManaged = collapseMode === 'managed';
    const isExpanded = isManaged ? !isCollapsed : true;

    const parsedCrossTeamPrefix = useMemo(() => parseCrossTeamPrefix(message.text), [message.text]);
    const qualifiedRecipient = useMemo(() => parseQualifiedRecipient(message.to), [message.to]);
    const crossTeamSentTarget = useMemo(
      () => getCrossTeamSentTarget(message.to, teamName, localMemberNames),
      [message.to, teamName, localMemberNames]
    );
    const crossTeamSentMemberName = useMemo(
      () => getCrossTeamSentMemberName(message.to),
      [message.to]
    );
    const isCrossTeam = message.source === CROSS_TEAM_SOURCE || parsedCrossTeamPrefix !== null;
    const isCrossTeamSent =
      message.source === CROSS_TEAM_SENT_SOURCE || crossTeamSentTarget !== null;
    const isCrossTeamAny = isCrossTeam || isCrossTeamSent;
    const crossTeamOrigin = useMemo(() => {
      if (!isCrossTeam) return null;
      const fromValue = parsedCrossTeamPrefix?.from ?? message.from;
      const dot = fromValue.indexOf('.');
      if (dot <= 0 || dot === fromValue.length - 1) return null;
      return {
        teamName: fromValue.substring(0, dot),
        memberName: fromValue.substring(dot + 1),
      };
    }, [isCrossTeam, message.from, parsedCrossTeamPrefix]);
    const crossTeamTarget = useMemo(() => {
      if (!isCrossTeamSent) return null;
      if (crossTeamSentTarget) return crossTeamSentTarget;
      if (qualifiedRecipient) return qualifiedRecipient.teamName;
      if (!message.to) return null;
      const dot = message.to.indexOf('.');
      if (dot <= 0) return message.to;
      return message.to.substring(0, dot);
    }, [crossTeamSentTarget, isCrossTeamSent, message.to, qualifiedRecipient]);
    const senderName = crossTeamOrigin ? crossTeamOrigin.memberName : message.from;
    const senderColor = crossTeamOrigin ? undefined : (memberColor ?? message.color);
    const senderHideAvatar =
      message.from === 'user' ||
      message.from === 'system' ||
      crossTeamOrigin?.memberName === 'user';

    // Strip agent-only blocks + normalize escape sequences (before linkification)
    const strippedText = useMemo(() => {
      if (structured) return null;
      let stripped = stripAgentBlocks(message.text).trim();
      if (!stripped) return null; // All content was agent-only blocks → show summary instead
      // Strip cross-team metadata tag (e.g. `<cross-team from="team.lead" depth="0" />\n`)
      // — kept in stored text for CLI agents / durable artifacts.
      if (isCrossTeamAny) {
        stripped = stripCrossTeamPrefix(stripped);
      }
      // Normalize literal \n from historical CLI-produced text to real newlines
      return stripped.replace(/\\n/g, '\n').replace(/\\t/g, '\t');
    }, [structured, message.text, isCrossTeamAny]);

    // Parse reply BEFORE linkification — linkifyAllMentionsInMarkdown transforms @name
    // into markdown links which breaks the reply regex matcher
    const parsedReply = useMemo(
      () => (strippedText ? parseMessageReply(strippedText) : null),
      [strippedText]
    );

    // Linkify task IDs (always, for TaskTooltip) + @mentions for display
    const displayText = useMemo(() => {
      if (!strippedText) return null;
      let result = highlightSystemLabels(strippedText, !!systemLabel);
      result = linkifyTaskIdsInMarkdown(result, message.taskRefs);
      if ((memberColorMap && memberColorMap.size > 0) || teamNames.length > 0)
        result = linkifyAllMentionsInMarkdown(result, memberColorMap ?? new Map(), teamNames);
      return result;
    }, [strippedText, memberColorMap, teamNames, systemLabel]);

    const crossTeamPreview = useMemo(() => {
      if (!isCrossTeamAny || !strippedText) return '';
      const oneLine = strippedText.replace(/\n+/g, ' ').trim();
      if (!oneLine) return '';
      return oneLine.length > 80 ? oneLine.slice(0, 80) + '…' : oneLine;
    }, [isCrossTeamAny, strippedText]);

    const rawSummary = useMemo(() => {
      if (crossTeamPreview) return crossTeamPreview;
      const s =
        message.summary || (structured ? getStructuredMessageSummary(structured) : '') || '';
      if (s) return s;
      // Fallback: use the beginning of message text as preview for plain-text messages
      const plain = stripAgentBlocks(message.text).trim();
      if (!plain) return '';
      const oneLine = plain.replace(/\n+/g, ' ');
      return oneLine.length > 80 ? oneLine.slice(0, 80) + '…' : oneLine;
    }, [crossTeamPreview, message.summary, structured, message.text]);
    const summaryText = useMemo(() => extractMarkdownPlainText(rawSummary), [rawSummary]);

    // Noise messages: minimal inline row
    if (noiseLabel) {
      return <NoiseRow name={message.from} label={noiseLabel} colors={colors} />;
    }

    const messageType =
      structured && typeof structured.type === 'string'
        ? getMessageTypeLabel(structured.type)
        : null;
    const autoSummary = structured ? getStructuredMessageSummary(structured) : null;

    const handleCreateTask = useCallback((): void => {
      const subject = message.summary || autoSummary || `Task from ${message.from}`;
      const plainText = structured
        ? JSON.stringify(structured, null, 2)
        : stripAgentBlocks(message.text);
      const description = `From: ${message.from}\nAt: ${timestamp}\n\n${plainText}`.slice(0, 2000);
      onCreateTask?.(subject, description);
    }, [
      autoSummary,
      message.from,
      message.summary,
      message.text,
      onCreateTask,
      structured,
      timestamp,
    ]);

    const isHeaderClickable = isManaged && canToggleCollapse;
    const showChevron = isHeaderClickable && !compactHeader;
    const isUserSent = message.source === 'user_sent' || isCrossTeamSent;
    const isSystemMessage = message.from === 'system';
    const handleHeaderToggle = useCallback(() => {
      if (isHeaderClickable && collapseToggleKey) {
        onToggleCollapse?.(collapseToggleKey);
      }
    }, [collapseToggleKey, isHeaderClickable, onToggleCollapse]);

    return (
      <article
        className="group overflow-hidden rounded-md"
        style={{
          marginLeft: isUserSent ? 15 : undefined,
          backgroundColor:
            rateLimited || isApiError
              ? 'var(--tool-result-error-bg)'
              : isCrossTeamAny
                ? 'var(--cross-team-bg)'
                : isSystemMessage
                  ? 'var(--system-activity-bg)'
                  : zebraShade
                    ? CARD_BG_ZEBRA
                    : CARD_BG,
          border:
            rateLimited || isApiError
              ? '1px solid var(--tool-result-error-border)'
              : isCrossTeamAny
                ? '1px solid var(--cross-team-border)'
                : isSystemMessage
                  ? '1px solid var(--system-activity-border)'
                  : CARD_BORDER_STYLE,
          borderLeft:
            rateLimited || isApiError
              ? '3px solid var(--tool-result-error-text)'
              : isCrossTeamAny
                ? '3px solid var(--cross-team-accent)'
                : isSystemMessage
                  ? '3px solid var(--system-activity-accent)'
                  : `3px solid ${getThemedBorder(colors, isLight)}`,
        }}
      >
        {/* Header — div with role=button (cannot use <button> due to nested buttons inside) */}
        {/* eslint-disable-next-line jsx-a11y/no-static-element-interactions -- role=button, tabIndex, onKeyDown below; nested buttons prevent using native button */}
        <div
          role={isHeaderClickable ? 'button' : undefined}
          tabIndex={isHeaderClickable ? 0 : undefined}
          className={[
            'flex min-w-0 items-center gap-2 px-3 py-2',
            isHeaderClickable ? 'cursor-pointer select-none' : '',
          ].join(' ')}
          onClick={handleHeaderToggle}
          onKeyDown={
            isHeaderClickable
              ? (e) => {
                  if (e.key === 'Enter' || e.key === ' ') {
                    e.preventDefault();
                    handleHeaderToggle?.();
                  }
                }
              : undefined
          }
        >
          {isUnread ? (
            <span className="size-2 shrink-0 rounded-full bg-blue-500" title="Unread" aria-hidden />
          ) : null}
          {/* Chevron for collapsible messages */}
          {showChevron ? (
            <ChevronRight
              className="size-3 shrink-0 transition-transform duration-150"
              style={{
                color: CARD_ICON_MUTED,
                transform: isExpanded ? 'rotate(90deg)' : undefined,
              }}
            />
          ) : null}

          {/* Sender avatar + name badge */}
          {crossTeamOrigin ? (
            <CrossTeamTeamBadge teamName={crossTeamOrigin.teamName} onClick={onTeamClick} />
          ) : null}
          <MemberBadge
            name={senderName}
            color={senderColor}
            hideAvatar={senderHideAvatar || compactHeader}
            onClick={onMemberNameClick}
            disableHoverCard={crossTeamOrigin != null}
          />

          {/* Role */}
          {!compactHeader && formattedRole ? (
            <span className="text-[10px]" style={{ color: CARD_ICON_MUTED }}>
              {formattedRole}
            </span>
          ) : null}

          {/* Message type label or system label */}
          {systemLabel ? (
            <span
              className="text-[10px] uppercase tracking-wide"
              style={{ color: CARD_ICON_MUTED }}
            >
              {systemLabel}
            </span>
          ) : messageType ? (
            <span
              className="text-[10px] uppercase tracking-wide"
              style={{ color: CARD_ICON_MUTED }}
            >
              {messageType}
            </span>
          ) : null}

          {/* Lead session marker */}
          {message.source === 'lead_session' ? (
            <span
              className="text-[10px] uppercase tracking-wide"
              style={{ color: CARD_ICON_MUTED }}
            >
              session
            </span>
          ) : message.source === 'lead_process' ? (
            <span
              className="text-[10px] uppercase tracking-wide"
              style={{ color: CARD_ICON_MUTED }}
            >
              live
            </span>
          ) : null}

          {/* Rate limit warning badge */}
          {rateLimited ? (
            <span className="inline-flex items-center gap-1 rounded-full bg-red-500/20 px-1.5 py-0.5 text-[10px] font-medium text-red-400">
              <AlertTriangle size={10} />
              Rate Limited
            </span>
          ) : null}

          {/* API Error warning badge */}
          {isApiError && !rateLimited ? (
            <span className="inline-flex items-center gap-1 rounded-full bg-red-500/20 px-1.5 py-0.5 text-[10px] font-medium text-red-400">
              <AlertTriangle size={10} />
              API Error
            </span>
          ) : null}

          {/* Recipient — arrow + avatar + badge */}
          {message.to && message.to !== message.from ? (
            <>
              <span style={{ color: CARD_ICON_MUTED }} className="text-[10px]">
                &rarr;
              </span>
              {crossTeamTarget ? (
                <CrossTeamTeamBadge teamName={crossTeamTarget} onClick={onTeamClick} />
              ) : null}
              {crossTeamSentMemberName || !crossTeamTarget ? (
                <MemberBadge
                  name={crossTeamSentMemberName ?? qualifiedRecipient?.memberName ?? message.to}
                  color={crossTeamTarget ? undefined : recipientColor}
                  hideAvatar={
                    compactHeader ||
                    (crossTeamSentMemberName ?? qualifiedRecipient?.memberName ?? message.to) ===
                      'user'
                  }
                  onClick={onMemberNameClick}
                  disableHoverCard={crossTeamTarget != null}
                />
              ) : null}
            </>
          ) : null}

          {/* Summary */}
          <span className="min-w-0 flex-1 truncate text-xs" style={{ color: CARD_TEXT_LIGHT }}>
            {onTaskIdClick ? linkifyTaskIds(summaryText, onTaskIdClick) : summaryText}
          </span>

          {/* Timestamp */}
          <div className="relative flex shrink-0 items-center gap-1.5">
            <span
              className={cn(
                'text-[10px] transition-opacity',
                onExpand && expandItemKey && 'group-hover:opacity-0'
              )}
              style={{ color: CARD_ICON_MUTED }}
            >
              {timestamp}
            </span>
            {onExpand && expandItemKey && (
              <button
                type="button"
                aria-label="Expand message"
                className="absolute inset-0 flex items-center justify-center rounded opacity-0 transition-opacity focus-visible:opacity-100 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-blue-500/50 group-hover:opacity-100"
                style={{ color: CARD_ICON_MUTED }}
                onClick={(e) => {
                  e.stopPropagation();
                  onExpand(expandItemKey);
                }}
                onKeyDown={(e) => e.stopPropagation()}
              >
                <Maximize2 size={12} />
              </button>
            )}
          </div>
        </div>

        {/* Content — collapsed for system messages, expanded for others */}
        {isExpanded ? (
          <div className="min-w-0 overflow-hidden px-3 pb-3">
            {structured ? (
              <div className="space-y-2">
                {autoSummary && autoSummary !== messageType ? (
                  <p className="text-xs text-[var(--color-text-secondary)]">{autoSummary}</p>
                ) : null}
                <details className="rounded border border-[var(--color-border)] bg-[var(--color-surface)]">
                  <summary className="cursor-pointer px-2 py-1 text-[11px] text-[var(--color-text-muted)]">
                    Raw JSON
                  </summary>
                  <pre className="overflow-auto px-2 pb-2 text-[11px] leading-relaxed text-[var(--color-text-muted)]">
                    {JSON.stringify(structured, null, 2)}
                  </pre>
                </details>
              </div>
            ) : parsedReply ? (
              <ReplyQuoteBlock
                reply={parsedReply}
                memberColor={memberColorMap?.get(parsedReply.agentName)}
                replyTaskRefs={message.taskRefs}
              />
            ) : displayText ? (
              <div className="group/message-body relative">
                <div className="absolute right-1 top-1 z-10 flex items-center gap-0.5 opacity-0 transition-opacity group-hover/message-body:opacity-100">
                  {onReply ? (
                    <Tooltip>
                      <TooltipTrigger asChild>
                        <button
                          type="button"
                          className="rounded p-1 transition-colors hover:bg-[var(--color-surface-raised)]"
                          style={{ color: CARD_ICON_MUTED }}
                          onClick={(e) => {
                            e.stopPropagation();
                            onReply(message);
                          }}
                        >
                          <Reply size={14} />
                        </button>
                      </TooltipTrigger>
                      <TooltipContent side="top">Reply to message</TooltipContent>
                    </Tooltip>
                  ) : null}
                  {onCreateTask ? (
                    <Tooltip>
                      <TooltipTrigger asChild>
                        <button
                          type="button"
                          className="rounded p-1 transition-colors hover:bg-[var(--color-surface-raised)]"
                          style={{ color: CARD_ICON_MUTED }}
                          onClick={(e) => {
                            e.stopPropagation();
                            handleCreateTask();
                          }}
                        >
                          <ListPlus size={14} />
                        </button>
                      </TooltipTrigger>
                      <TooltipContent side="top">Create task from message</TooltipContent>
                    </Tooltip>
                  ) : null}
                  <CopyButton text={displayText} inline />
                </div>
                <ExpandableContent>
                  <span
                    onClickCapture={
                      onTaskIdClick
                        ? (e) => {
                            const link = (e.target as HTMLElement).closest<HTMLAnchorElement>(
                              'a[href^="task://"]'
                            );
                            if (link) {
                              e.preventDefault();
                              e.stopPropagation();
                              const href = link.getAttribute('href');
                              const parsedTaskLink = href ? parseTaskLinkHref(href) : null;
                              if (parsedTaskLink?.taskId) onTaskIdClick(parsedTaskLink.taskId);
                            }
                          }
                        : undefined
                    }
                  >
                    <MarkdownViewer
                      content={displayText}
                      maxHeight="max-h-none"
                      bare
                      teamColorByName={teamColorByName}
                      onTeamClick={onTeamClick}
                    />
                  </span>
                </ExpandableContent>
              </div>
            ) : summaryText ? (
              <p className="text-xs italic" style={{ color: CARD_TEXT_LIGHT }}>
                {summaryText}
              </p>
            ) : null}
            {/* Auth error recovery action */}
            {isAuthError && onRestartTeam ? (
              <div className="mt-2 flex items-start gap-2 rounded border border-red-500/30 bg-red-500/5 px-3 py-2">
                <AlertTriangle size={14} className="mt-0.5 shrink-0 text-red-400" />
                <div className="flex-1 space-y-1.5">
                  <p className="text-[11px] leading-relaxed text-red-300/90">
                    Authentication failed. Restarting the team will refresh the session and may
                    resolve this issue. If the problem persists, check your API credentials or try
                    again later.
                  </p>
                  <button
                    type="button"
                    className="inline-flex items-center gap-1.5 rounded-md bg-red-500/20 px-2.5 py-1 text-[11px] font-medium text-red-300 transition-colors hover:bg-red-500/30 hover:text-red-200"
                    onClick={(e) => {
                      e.stopPropagation();
                      onRestartTeam();
                    }}
                  >
                    <RefreshCw size={11} />
                    Restart team
                  </button>
                </div>
              </div>
            ) : null}
            {message.attachments?.length && message.messageId ? (
              <AttachmentDisplay
                teamName={teamName}
                messageId={message.messageId}
                attachments={message.attachments}
              />
            ) : null}
          </div>
        ) : null}
      </article>
    );
  },
  (prev, next) =>
    prev.teamName === next.teamName &&
    prev.localMemberNames === next.localMemberNames &&
    prev.memberRole === next.memberRole &&
    prev.memberColor === next.memberColor &&
    prev.recipientColor === next.recipientColor &&
    prev.isUnread === next.isUnread &&
    prev.memberColorMap === next.memberColorMap &&
    areStringArraysEqual(prev.teamNames, next.teamNames) &&
    areStringMapsEqual(prev.teamColorByName, next.teamColorByName) &&
    prev.onTeamClick === next.onTeamClick &&
    prev.onMemberNameClick === next.onMemberNameClick &&
    prev.onCreateTask === next.onCreateTask &&
    prev.onReply === next.onReply &&
    prev.onTaskIdClick === next.onTaskIdClick &&
    prev.onRestartTeam === next.onRestartTeam &&
    prev.zebraShade === next.zebraShade &&
    prev.collapseMode === next.collapseMode &&
    prev.isCollapsed === next.isCollapsed &&
    prev.canToggleCollapse === next.canToggleCollapse &&
    prev.collapseToggleKey === next.collapseToggleKey &&
    prev.onToggleCollapse === next.onToggleCollapse &&
    prev.compactHeader === next.compactHeader &&
    prev.onExpand === next.onExpand &&
    prev.expandItemKey === next.expandItemKey &&
    areMessagesEquivalentForActivityItem(prev.message, next.message)
);