import { t } from "@lingui/core/macro";
import { Trans, useLingui } from "@lingui/react/macro";
import type { AgentSkillCatalogEntry, ThreadMessage } from "@rakazo/contracts";
import { ATTACHMENT_ALLOWED_MIME_TYPES } from "@rakazo/contracts";
import type { ComposerMention, SlashActionId } from "@rakazo/core";
import {
  clampMentionHighlightIndex,
  mentionChipKey,
  resolveMentionPickerKey,
  SLASH_ACTIONS,
  serializeComposerPrompt,
  truncateSlashDescription,
} from "@rakazo/core";
import {
  BotAvatar,
  Button,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@rakazo/ui-web";
import {
  ArrowUp,
  Box,
  Clock,
  Mic,
  Paperclip,
  Play,
  Plus,
  Puzzle,
  Settings,
  Square,
  X,
} from "lucide-react";
import type { ClipboardEvent, DragEvent, RefObject } from "react";
import { memo, useEffect, useId, useLayoutEffect, useMemo, useRef, useState } from "react";
import { VoiceAuroraRim } from "../../components/voice/VoiceAurora";
import { isFileDrag, isFilePaste } from "../../lib/pending-attachments";
import { AutopilotDialog } from "./autopilot-dialog";
import { previewMessageText } from "./message-preview";
import type { PendingAttachment } from "./shell-types";
import { FALLBACK_BOT_COLOR } from "./shell-types";

// ".zip" too: Windows reports ZIPs as application/x-zip-compressed.
const ATTACHMENT_ACCEPT = [...ATTACHMENT_ALLOWED_MIME_TYPES, ".zip"].join(",");

const addButtonClass =
  "tactile-press size-10 shrink-0 rounded-full border border-border bg-foreground/5 text-foreground/80 transition-all hover:bg-foreground/10 hover:text-foreground flex items-center justify-center cursor-pointer";

export const Composer = memo(function Composer({
  running,
  disabled,
  pendingAttachments,
  attachmentNotice,
  sendError,
  runError,
  runErrorId,
  onRunErrorPresented,
  onDismissError,
  sending,
  fileInputRef,
  onAttachmentPick,
  onRemoveAttachment,
  onSend,
  onStop,
  onVoice,
  voiceReady = false,
  voiceColor,
  replyTarget,
  replyQuote,
  replyTargetName,
  onClearReply,
  mentionTargets,
  agentSkills,
  onSlashOpen,
  onSlashAction,
  onConnectModel,
  onAutopilot,
}: {
  running: boolean;
  disabled?: boolean;
  pendingAttachments: PendingAttachment[];
  attachmentNotice: string | null;
  sendError: string | null;
  runError: string | null;
  runErrorId: string | null;
  onRunErrorPresented: (runId: string) => void;
  onDismissError: () => void;
  sending: boolean;
  fileInputRef: RefObject<HTMLInputElement | null>;
  onAttachmentPick: (files: FileList | null) => void | Promise<void>;
  onRemoveAttachment: (attachment: PendingAttachment) => void;
  onSend: (text: string, mentions?: ComposerMention[]) => Promise<void>;
  onStop: () => Promise<void>;
  onVoice?: () => void;
  voiceReady?: boolean;
  voiceColor?: string;
  replyTarget?: ThreadMessage | null;
  replyQuote?: string | null;
  replyTargetName?: string;
  onClearReply?: () => void;
  mentionTargets?: ComposerMention[];
  agentSkills?: AgentSkillCatalogEntry[];
  onSlashOpen?: () => void;
  onSlashAction?: (action: SlashActionId) => void;
  /** Set while no model is connected: nothing can run until one is. */
  onConnectModel?: () => void;
  /** Hand the order to the autopilot; the composer menu offers it only when set. */
  onAutopilot?: (goal: string, until?: string) => Promise<void>;
}) {
  const { t } = useLingui();
  const [draft, setDraft] = useState("");
  const [autopilotOpen, setAutopilotOpen] = useState(false);
  const [mentionQuery, setMentionQuery] = useState<string | null>(null);
  const [mentionHighlightIndex, setMentionHighlightIndex] = useState(0);
  const [slashQuery, setSlashQuery] = useState<string | null>(null);
  const [selectedSkill, setSelectedSkill] = useState<AgentSkillCatalogEntry | null>(null);
  const [selectedMentions, setSelectedMentions] = useState<ComposerMention[]>([]);
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const runErrorRef = useRef<HTMLDivElement>(null);
  const submitFingerprint = useRef<string | null>(null);
  useEffect(() => {
    if (!sendError && !runError) return;
    const timer = setTimeout(() => {
      onDismissError();
    }, 8000);
    return () => clearTimeout(timer);
  }, [sendError, runError, onDismissError]);

  const presentedRunErrorIdRef = useRef<string | null>(null);
  const mentionListboxId = useId();
  const dragDepth = useRef(0);
  const [draggingFiles, setDraggingFiles] = useState(false);
  const canSend =
    draft.trim().length > 0 ||
    selectedSkill !== null ||
    selectedMentions.length > 0 ||
    pendingAttachments.length > 0;
  // One slot, two jobs: an empty draft talks, a written one sends.
  const voiceInSlot = Boolean(onVoice) && !canSend;
  const primaryAction = voiceInSlot ? (
    <Button
      key="voice"
      size="icon"
      aria-label={t`Voice`}
      title={voiceReady ? t`Start voice conversation` : t`Set up voice`}
      disabled={disabled}
      onClick={onVoice}
      data-testid="composer-voice-primary"
      className="tactile-press relative size-10 shrink-0 overflow-hidden rounded-full transition-all active:scale-90 animate-in fade-in zoom-in-75 duration-150 flex items-center justify-center cursor-pointer"
    >
      {voiceReady ? (
        <VoiceAuroraRim botColor={voiceColor} className="inset-x-[22%] h-0.5 blur-[3px]" />
      ) : null}
      <Mic strokeWidth={2.2} className="size-icon-lg" />
    </Button>
  ) : (
    <Button
      key="send"
      size="icon"
      aria-label={t`Send`}
      disabled={!canSend || disabled}
      onClick={send}
      className={`tactile-press size-10 shrink-0 rounded-full transition-all active:scale-90 disabled:bg-foreground/[0.08] disabled:text-foreground/20 flex items-center justify-center cursor-pointer ${
        onVoice ? "animate-in fade-in zoom-in-75 duration-150" : ""
      }`}
    >
      <ArrowUp strokeWidth={2.6} className="size-icon-lg" />
    </Button>
  );

  useEffect(() => {
    if (!runError || !runErrorId) return;
    const currentRunErrorId = runErrorId;
    let frame = 0;
    function recordIfPresented() {
      cancelAnimationFrame(frame);
      frame = requestAnimationFrame(() => {
        const element = runErrorRef.current;
        if (!element || document.visibilityState !== "visible") return;
        const rect = element.getBoundingClientRect();
        const topElement = document.elementFromPoint(
          rect.left + rect.width / 2,
          rect.top + rect.height / 2,
        );
        if (topElement && (topElement === element || element.contains(topElement))) {
          if (presentedRunErrorIdRef.current === currentRunErrorId) return;
          presentedRunErrorIdRef.current = currentRunErrorId;
          onRunErrorPresented(currentRunErrorId);
        }
      });
    }
    recordIfPresented();
    const observer = new MutationObserver(recordIfPresented);
    observer.observe(document.body, { childList: true, subtree: true });
    document.addEventListener("transitionend", recordIfPresented);
    document.addEventListener("visibilitychange", recordIfPresented);
    return () => {
      cancelAnimationFrame(frame);
      observer.disconnect();
      document.removeEventListener("transitionend", recordIfPresented);
      document.removeEventListener("visibilitychange", recordIfPresented);
    };
  }, [onRunErrorPresented, runError, runErrorId]);

  useLayoutEffect(() => {
    const el = textareaRef.current;
    if (!el) return;

    function syncHeight() {
      const textarea = textareaRef.current;
      if (!textarea) return;
      textarea.style.height = "0px";
      textarea.style.height = `${textarea.scrollHeight}px`;
    }

    syncHeight();
    let lastWidth = el.getBoundingClientRect().width;
    const observer = new ResizeObserver(() => {
      const textarea = textareaRef.current;
      if (!textarea) return;
      const width = textarea.getBoundingClientRect().width;
      if (width === lastWidth) return;
      lastWidth = width;
      syncHeight();
    });
    observer.observe(el);
    return () => observer.disconnect();
  }, [draft]);

  function updateDraft(value: string) {
    submitFingerprint.current = null;
    setDraft(value);
    const mentionMatch = /(?:^|\s)@([\w-]*)$/.exec(value);
    setMentionQuery(mentionMatch ? (mentionMatch[1] ?? "") : null);
    // `/` only at the start of the draft so forced skills expand (`Use skill:` / `/Name` prefix).
    const slashMatch = selectedSkill === null ? /^\/([^\n]*)$/.exec(value) : null;
    const nextSlash = slashMatch ? (slashMatch[1] ?? "") : null;
    if (nextSlash !== null && slashQuery === null) onSlashOpen?.();
    setSlashQuery(nextSlash);
  }

  function focusComposer() {
    textareaRef.current?.focus();
  }

  function insertMention(mention: ComposerMention) {
    setDraft((current) => current.replace(/@([\w-]*)$/, ""));
    setMentionQuery(null);
    setMentionHighlightIndex(0);
    setSelectedMentions((current) =>
      current.some((selected) => mentionChipKey(selected) === mentionChipKey(mention))
        ? current
        : [...current, mention],
    );
    focusComposer();
  }

  function insertSkill(skill: AgentSkillCatalogEntry) {
    setSelectedSkill(skill);
    setDraft("");
    setSlashQuery(null);
  }

  function runSlashAction(action: SlashActionId) {
    setDraft("");
    setSlashQuery(null);
    onSlashAction?.(action);
  }

  function removeLastChip() {
    if (selectedMentions.length > 0) {
      setSelectedMentions((current) => current.slice(0, -1));
      return;
    }
    if (selectedSkill) setSelectedSkill(null);
  }

  const mentionOptions = useMemo(() => {
    if (mentionQuery === null || !mentionTargets?.length) return [];
    const query = mentionQuery.trim().toLowerCase();
    return mentionTargets
      .filter((target) => !query || target.name.toLowerCase().startsWith(query))
      .slice(0, 10);
  }, [mentionQuery, mentionTargets]);

  useEffect(() => {
    setMentionHighlightIndex(0);
  }, [mentionQuery]);

  const activeMentionIndex = clampMentionHighlightIndex(
    mentionHighlightIndex,
    mentionOptions.length,
  );
  const mentionPickerOpen = mentionOptions.length > 0;
  const activeMentionOptionId = mentionPickerOpen
    ? `${mentionListboxId}-option-${activeMentionIndex}`
    : undefined;

  const slashSkillOptions = useMemo(() => {
    if (slashQuery === null) return [];
    const query = slashQuery.trim().toLowerCase();
    const skills = agentSkills ?? [];
    return skills
      .filter((skill) => {
        if (!query) return true;
        return (
          skill.name.toLowerCase().includes(query) ||
          skill.description.toLowerCase().includes(query)
        );
      })
      .slice(0, 8);
  }, [agentSkills, slashQuery]);

  const slashActionOptions = useMemo(() => {
    if (slashQuery === null) return [];
    const query = slashQuery.trim().toLowerCase();
    return SLASH_ACTIONS.filter((action) => !query || action.label.toLowerCase().includes(query));
  }, [slashQuery]);

  const showSlashPicker =
    slashQuery !== null &&
    mentionQuery === null &&
    (slashSkillOptions.length > 0 || slashActionOptions.length > 0);

  function send() {
    if (!canSend || disabled) return;
    const text = serializeComposerPrompt(draft, selectedSkill, selectedMentions);
    const fingerprint = [text, ...selectedMentions.map((mention) => mentionChipKey(mention))].join(
      "\n",
    );
    if (submitFingerprint.current === fingerprint) return;
    submitFingerprint.current = fingerprint;
    setDraft("");
    setMentionQuery(null);
    setMentionHighlightIndex(0);
    setSlashQuery(null);
    setSelectedSkill(null);
    const mentions = selectedMentions;
    setSelectedMentions([]);
    void onSend(text, mentions);
  }

  function handleDragEnter(event: DragEvent<HTMLFieldSetElement>) {
    const dataTransfer = event.dataTransfer;
    if (!isFileDrag(dataTransfer)) return;
    event.preventDefault();
    if (disabled) {
      dragDepth.current = 0;
      setDraggingFiles(false);
      return;
    }
    dragDepth.current += 1;
    setDraggingFiles(true);
  }

  function handleDragOver(event: DragEvent<HTMLFieldSetElement>) {
    const dataTransfer = event.dataTransfer;
    if (!isFileDrag(dataTransfer)) return;
    event.preventDefault();
    dataTransfer.dropEffect = disabled ? "none" : "copy";
    if (disabled) {
      dragDepth.current = 0;
      setDraggingFiles(false);
      return;
    }
    setDraggingFiles(true);
  }

  function handleDragLeave(event: DragEvent<HTMLFieldSetElement>) {
    if (!isFileDrag(event.dataTransfer)) return;
    if (disabled) {
      dragDepth.current = 0;
      setDraggingFiles(false);
      return;
    }
    dragDepth.current = Math.max(0, dragDepth.current - 1);
    if (dragDepth.current === 0) setDraggingFiles(false);
  }

  function handleDrop(event: DragEvent<HTMLFieldSetElement>) {
    const dataTransfer = event.dataTransfer;
    if (!isFileDrag(dataTransfer)) return;
    event.preventDefault();
    dragDepth.current = 0;
    setDraggingFiles(false);
    if (!disabled) void onAttachmentPick(dataTransfer.files);
  }

  function handlePaste(event: ClipboardEvent<HTMLTextAreaElement>) {
    const clipboardData = event.clipboardData;
    // Only intercept real FileList pastes; leave text-only / empty-files native.
    if (disabled || !clipboardData || !isFilePaste(clipboardData)) return;
    event.preventDefault();
    void onAttachmentPick(clipboardData.files);
    const text = clipboardData.getData("text/plain");
    if (!text) return;
    const textarea = event.currentTarget;
    const start = textarea.selectionStart;
    const end = textarea.selectionEnd;
    updateDraft(`${draft.slice(0, start)}${text}${draft.slice(end)}`);
    const caret = start + text.length;
    window.requestAnimationFrame(() => {
      textareaRef.current?.setSelectionRange(caret, caret);
    });
  }

  const showComposerPlaceholder =
    draft.length === 0 && selectedSkill === null && selectedMentions.length === 0;
  const replyName = replyTarget ? (replyTargetName ?? previewMessageText(replyTarget)) : "";

  return (
    <fieldset
      aria-label={t`Message composer`}
      data-dragging={draggingFiles ? "files" : undefined}
      onDragEnter={handleDragEnter}
      onDragOver={handleDragOver}
      onDragLeave={handleDragLeave}
      onDrop={handleDrop}
      className={`relative z-30 m-0 min-w-0 border-0 px-3 pb-4 pt-3 md:px-6 md:pb-6 ${
        draggingFiles ? "rounded-[14px] ring-2 ring-inset ring-ring" : ""
      }`}
    >
      <div className="mx-auto w-full max-w-4xl">
        {onConnectModel ? (
          <div
            data-testid="composer-model-needed"
            className="mb-3 flex items-center gap-3 rounded-[14px] border border-border bg-muted px-4 py-2 text-ui-body-sm text-foreground"
          >
            <span className="min-w-0 flex-1">
              <Trans>Connect a model so your Oo can reply.</Trans>
            </span>
            <Button size="sm" onClick={onConnectModel}>
              <Trans>Connect model</Trans>
            </Button>
          </div>
        ) : sendError || runError ? (
          <div
            ref={runErrorRef}
            role="alert"
            data-testid="composer-error"
            className="mb-3 flex items-center gap-2 rounded-[14px] border border-destructive/40 bg-destructive/10 px-4 py-2 text-ui-body-sm text-destructive"
          >
            <span className="min-w-0 flex-1">{sendError ?? runError}</span>
            <button
              type="button"
              aria-label={t`Dismiss error`}
              data-testid="composer-error-dismiss"
              onClick={() => {
                onDismissError();
                window.requestAnimationFrame(() => textareaRef.current?.focus());
              }}
              className="shrink-0 text-destructive hover:text-foreground"
            >
              <X strokeWidth={2} className="size-icon-sm" />
            </button>
          </div>
        ) : null}
        {replyTarget ? (
          <div
            data-testid="reply-chip"
            className="mb-2 flex items-center gap-2 rounded-full border border-border bg-muted px-3 py-1.5 text-ui-body-sm text-foreground/75"
          >
            <span className="min-w-0 flex-1 truncate text-muted-foreground">
              {replyQuote
                ? t`Replying to ${replyName}: “${replyQuote}”`
                : t`Replying to ${replyName}`}
            </span>
            <button
              type="button"
              aria-label={t`Cancel reply`}
              onClick={onClearReply}
              className="shrink-0 text-muted-foreground hover:text-foreground"
            >
              <X strokeWidth={2} className="size-icon-sm" />
            </button>
          </div>
        ) : null}
        {attachmentNotice ? (
          <div className="mb-3 rounded-[14px] border border-warning/40 bg-warning/10 px-4 py-2 text-ui-body-sm text-warning">
            {attachmentNotice}
          </div>
        ) : null}
        {pendingAttachments.length ? (
          <div className="mb-3 flex flex-wrap gap-2">
            {pendingAttachments.map((attachment) => (
              <div
                key={attachment.id}
                className="flex items-center gap-2 rounded-full border border-border bg-muted px-3 py-1.5 text-ui-body-sm text-foreground/75"
              >
                {attachment.previewUrl ? (
                  <img
                    src={attachment.previewUrl}
                    alt={attachment.file.name}
                    className="size-control-md rounded object-cover"
                  />
                ) : (
                  <Paperclip strokeWidth={1.8} className="size-icon-md" />
                )}
                <span className="max-w-[180px] truncate" dir="auto">
                  {attachment.file.name}
                </span>
                <button
                  type="button"
                  aria-label={t`Remove ${attachment.file.name}`}
                  onClick={() => onRemoveAttachment(attachment)}
                  className="text-muted-foreground hover:text-foreground"
                >
                  <X strokeWidth={2} className="size-icon-sm" />
                </button>
              </div>
            ))}
          </div>
        ) : null}
        {mentionPickerOpen ? (
          <div
            id={mentionListboxId}
            role="listbox"
            aria-label={t`Mentions`}
            data-testid="mention-picker"
            className="mb-2 max-h-64 overflow-y-auto rounded-[14px] border border-border bg-muted"
          >
            {mentionOptions.map((mention, index) => {
              const optionId = `${mentionListboxId}-option-${index}`;
              const highlighted = index === activeMentionIndex;
              return (
                <button
                  id={optionId}
                  key={mentionChipKey(mention)}
                  type="button"
                  role="option"
                  aria-selected={highlighted}
                  aria-label={`@${mention.name}`}
                  data-mention-name={mention.name}
                  onMouseDown={(event) => event.preventDefault()}
                  onClick={() => insertMention(mention)}
                  onMouseEnter={() => setMentionHighlightIndex(index)}
                  className={`flex w-full items-start gap-3 px-4 py-2.5 text-start hover:bg-accent ${
                    highlighted ? "bg-accent" : ""
                  }`}
                >
                  <span aria-hidden="true">
                    <MentionOptionIcon mention={mention} />
                  </span>
                  <span className="min-w-0">
                    <span dir="auto" className="block text-ui-body text-foreground">
                      @{mention.name}
                    </span>
                    {mention.subtitle ? (
                      <span
                        dir="auto"
                        aria-hidden="true"
                        className="block truncate text-ui-body-sm text-muted-foreground"
                      >
                        {mention.subtitle}
                      </span>
                    ) : null}
                  </span>
                </button>
              );
            })}
          </div>
        ) : null}
        {showSlashPicker ? (
          <div
            data-testid="slash-picker"
            className="mb-2 overflow-hidden rounded-[14px] border border-border bg-muted"
          >
            {slashSkillOptions.map((skill) => (
              <button
                key={skill.id}
                type="button"
                aria-label={t`Skill ${skill.name}`}
                onClick={() => insertSkill(skill)}
                className="flex w-full items-start gap-3 px-4 py-2.5 text-start hover:bg-accent"
              >
                <Box
                  strokeWidth={1.7}
                  className="mt-0.5 shrink-0 text-muted-foreground size-icon-md"
                />
                <span className="min-w-0">
                  <span dir="auto" className="block text-ui-body text-foreground">
                    {skill.name}
                  </span>
                  <span dir="auto" className="block truncate text-ui-body-sm text-muted-foreground">
                    {truncateSlashDescription(skill.description)}
                  </span>
                </span>
              </button>
            ))}
            {slashActionOptions.map((action) => {
              const label = slashActionLabel(action.id);
              return (
                <button
                  key={action.id}
                  type="button"
                  aria-label={label}
                  onClick={() => runSlashAction(action.id)}
                  className="flex w-full items-center gap-3 px-4 py-2.5 text-start hover:bg-accent"
                >
                  <Settings
                    strokeWidth={1.7}
                    className="shrink-0 text-muted-foreground size-icon-md"
                  />
                  <span className="text-ui-body text-foreground">{label}</span>
                </button>
              );
            })}
          </div>
        ) : null}
        <div
          data-testid="composer-bar"
          className="apple-island relative flex items-center gap-3.5 rounded-[30px] py-3 pe-3.5 ps-4 transition-all duration-200"
        >
          <input
            ref={fileInputRef}
            type="file"
            multiple
            accept={ATTACHMENT_ACCEPT}
            className="hidden"
            onChange={(event) => void onAttachmentPick(event.target.files)}
          />
          {onAutopilot ? (
            <DropdownMenu>
              <DropdownMenuTrigger
                disabled={disabled}
                render={
                  <Button
                    variant="ghost"
                    size="icon"
                    aria-label={t`Add`}
                    className={addButtonClass}
                  />
                }
              >
                <Plus strokeWidth={2.2} className="size-icon-lg" />
              </DropdownMenuTrigger>
              <DropdownMenuContent side="top" className="w-auto min-w-40">
                <DropdownMenuItem onClick={() => fileInputRef.current?.click()}>
                  <Paperclip />
                  {t`Attach file`}
                </DropdownMenuItem>
                <DropdownMenuItem onClick={() => setAutopilotOpen(true)}>
                  <Play />
                  {t`Autopilot`}
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          ) : (
            <Button
              variant="ghost"
              size="icon"
              aria-label={t`Attach file`}
              disabled={disabled}
              onClick={() => fileInputRef.current?.click()}
              className={addButtonClass}
            >
              <Plus strokeWidth={2.2} className="size-icon-lg" />
            </Button>
          )}
          {autopilotOpen && onAutopilot ? (
            <AutopilotDialog
              draft={draft}
              onClose={() => setAutopilotOpen(false)}
              onStart={async (goal, until) => {
                await onAutopilot(goal, until);
                setDraft("");
              }}
            />
          ) : null}
          <div className="flex min-w-0 flex-1 flex-wrap items-end gap-1.5">
            {selectedSkill ? (
              <span
                data-testid="skill-chip"
                className="inline-flex max-w-full items-center gap-1.5 rounded-full border border-border bg-foreground/[0.08] px-3 py-1 text-ui-body font-medium text-foreground backdrop-blur-md"
              >
                <Box strokeWidth={1.8} className="shrink-0 text-muted-foreground size-icon-md" />
                <span dir="auto" className="truncate">
                  {selectedSkill.name}
                </span>
                <button
                  type="button"
                  aria-label={t`Remove skill ${selectedSkill.name}`}
                  onClick={() => setSelectedSkill(null)}
                  className="text-muted-foreground hover:text-foreground transition-colors"
                >
                  <X strokeWidth={2} className="size-icon-sm" />
                </button>
              </span>
            ) : null}
            {selectedMentions.map((mention) => (
              <span
                key={mentionChipKey(mention)}
                data-testid="mention-chip"
                data-mention-kind={mention.kind}
                className="inline-flex max-w-full items-center gap-1.5 rounded-full border border-border bg-foreground/[0.08] px-3 py-1 text-ui-body font-medium text-foreground backdrop-blur-md"
              >
                <MentionChipIcon mention={mention} />
                <span dir="auto" className="truncate">
                  {mention.name}
                </span>
                <button
                  type="button"
                  aria-label={t`Remove mention ${mention.name}`}
                  onClick={() =>
                    setSelectedMentions((current) =>
                      current.filter(
                        (selected) => mentionChipKey(selected) !== mentionChipKey(mention),
                      ),
                    )
                  }
                  className="text-muted-foreground hover:text-foreground transition-colors"
                >
                  <X strokeWidth={2} className="size-icon-sm" />
                </button>
              </span>
            ))}
            <textarea
              ref={textareaRef}
              value={draft}
              onChange={(event) => updateDraft(event.target.value)}
              onPaste={handlePaste}
              onKeyDown={(event) => {
                if (
                  event.key === "Backspace" &&
                  draft.length === 0 &&
                  (selectedSkill !== null || selectedMentions.length > 0)
                ) {
                  event.preventDefault();
                  removeLastChip();
                  return;
                }
                const action = resolveMentionPickerKey({
                  key: event.key,
                  shiftKey: event.shiftKey,
                  isComposing: event.nativeEvent.isComposing || event.keyCode === 229,
                  optionCount: mentionOptions.length,
                  highlightedIndex: activeMentionIndex,
                });
                if (action.type === "complete") {
                  const mention = mentionOptions[action.index];
                  if (!mention) return;
                  event.preventDefault();
                  insertMention(mention);
                  return;
                }
                if (action.type === "move") {
                  event.preventDefault();
                  setMentionHighlightIndex(action.index);
                  return;
                }
                if (action.type === "dismiss") {
                  event.preventDefault();
                  setMentionQuery(null);
                  setMentionHighlightIndex(0);
                  return;
                }
                if (action.type === "send") {
                  event.preventDefault();
                  send();
                }
              }}
              disabled={disabled}
              placeholder={showComposerPlaceholder ? t`Message…` : undefined}
              aria-label={t`Message`}
              role="combobox"
              aria-autocomplete="list"
              aria-haspopup="listbox"
              aria-expanded={mentionPickerOpen ? "true" : "false"}
              aria-controls={mentionPickerOpen ? mentionListboxId : undefined}
              aria-activedescendant={activeMentionOptionId}
              name="chat-message"
              autoComplete="off"
              dir="auto"
              rows={1}
              className="max-h-36 min-h-[28px] min-w-[8rem] flex-1 resize-none overflow-y-auto bg-transparent py-1 text-[16.5px] leading-[1.55] text-foreground outline-none placeholder:text-muted-foreground/75 disabled:opacity-40 font-normal"
            />
          </div>
          {running ? (
            <div className="flex items-center gap-2 shrink-0">
              {primaryAction}
              <Button
                variant="outline"
                size="icon"
                aria-label={t`Stop`}
                disabled={disabled || sending}
                onClick={() => void onStop()}
                className="tactile-press size-10 rounded-full border border-border bg-foreground/[0.08] text-foreground/90 shadow-sm transition-colors hover:bg-foreground/15 hover:text-foreground flex items-center justify-center cursor-pointer"
              >
                <Square strokeWidth={0} fill="currentColor" className="size-icon-sm" />
              </Button>
            </div>
          ) : (
            primaryAction
          )}
        </div>
      </div>
    </fieldset>
  );
});

function slashActionLabel(id: SlashActionId) {
  switch (id) {
    case "chat-settings":
      return t`Chat Settings`;
    case "settings-general":
      return t`Settings: General`;
    case "settings-usage":
      return t`Settings: Usage`;
  }
}

function MentionOptionIcon({ mention }: { mention: ComposerMention }) {
  if (mention.kind === "routine") {
    return (
      <Clock strokeWidth={1.7} className="mt-0.5 shrink-0 text-muted-foreground size-icon-md" />
    );
  }
  if (mention.kind === "connector") {
    return (
      <Puzzle strokeWidth={1.7} className="mt-0.5 shrink-0 text-muted-foreground size-icon-md" />
    );
  }
  if (mention.kind === "group") {
    return (
      <span className="mt-0.5 grid h-4 w-4 shrink-0 place-items-center rounded-full bg-accent text-ui-caption text-foreground/75">
        G
      </span>
    );
  }
  if (mention.kind === "everyone") {
    return (
      <span className="mt-0.5 grid h-4 w-4 shrink-0 place-items-center rounded-full bg-accent text-ui-caption text-foreground/75">
        @
      </span>
    );
  }
  return (
    <BotAvatar
      color={mention.color ?? FALLBACK_BOT_COLOR}
      identity={mention.id}
      className="size-icon-md"
    />
  );
}

function MentionChipIcon({ mention }: { mention: ComposerMention }) {
  if (mention.kind === "routine") {
    return <Clock strokeWidth={1.7} className="shrink-0 text-muted-foreground/70 size-icon-sm" />;
  }
  if (mention.kind === "connector") {
    return <Puzzle strokeWidth={1.7} className="shrink-0 text-muted-foreground/70 size-icon-sm" />;
  }
  if (mention.kind === "group" || mention.kind === "everyone") {
    return (
      <span className="grid h-4 w-4 shrink-0 place-items-center rounded-full bg-accent text-ui-caption text-foreground/75">
        {mention.kind === "group" ? "G" : "@"}
      </span>
    );
  }
  return (
    <BotAvatar
      color={mention.color ?? FALLBACK_BOT_COLOR}
      identity={mention.id}
      className="size-icon-md"
    />
  );
}