import { useCallback, useEffect, useRef, useState, type MouseEvent } from "react";
import { useTranslation } from "react-i18next";
import { FileText, ChevronDown, ChevronUp, Plus, Trash2, History, X } from "lucide-react";
import "./DocumentsView.css";
import "./TaskDocumentsTab.css";
import ReactMarkdown from "react-markdown";
import remarkGfm from "remark-gfm";
import type { ArtifactWithTask, Task, TaskDocument, TaskDocumentRevision } from "@fusion/core";
import { getErrorMessage } from "@fusion/core";
import type { ToastType } from "../hooks/useToast";
import {
  fetchTaskDocuments,
  fetchTaskDocumentRevisions,
  putTaskDocument,
  deleteTaskDocument,
  artifactMediaUrl,
} from "../api";
import { useArtifacts } from "../hooks/useArtifacts";
import { LoadingSpinner } from "./LoadingSpinner";
import { ArtifactMedia, getArtifactTypeLabel } from "./ArtifactMedia";

// Document key validation: alphanumeric, hyphens, underscores, 1-64 chars
const DOCUMENT_KEY_REGEX = /^[a-zA-Z0-9_-]{1,64}$/;
const MAX_CONTENT_PREVIEW = 200;
const TASK_DOCUMENTS_MARKDOWN_TOGGLE_STORAGE_KEY = "fusion.taskDocuments.renderMarkdown";

function readBooleanPref(key: string, defaultValue: boolean): boolean {
  if (typeof window === "undefined") return defaultValue;
  try {
    const raw = window.localStorage.getItem(key);
    if (raw === null) return defaultValue;
    return raw === "true";
  } catch {
    return defaultValue;
  }
}

function writeBooleanPref(key: string, value: boolean): void {
  if (typeof window === "undefined") return;
  try {
    window.localStorage.setItem(key, value ? "true" : "false");
  } catch {
    // ignore storage failures (quota, private mode, etc.)
  }
}

interface TaskDocumentsTabProps {
  taskId: string;
  addToast: (message: string, type?: ToastType) => void;
  onTaskUpdated?: (task: Task) => void;
  projectId?: string;
  canEdit?: boolean;
}

function formatTimestamp(iso?: string): string {
  if (!iso) return "";
  return new Date(iso).toLocaleString();
}

function getContentPreview(content: string, maxLength: number = MAX_CONTENT_PREVIEW): string {
  if (content.length <= maxLength) return content;
  return content.substring(0, maxLength) + "…";
}

function formatFileSize(bytes: number): string {
  if (bytes < 1024) {
    return `${bytes} B`;
  }

  if (bytes < 1024 * 1024) {
    return `${(bytes / 1024).toFixed(bytes >= 10 * 1024 ? 0 : 1)} KB`;
  }

  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
}

interface TaskArtifactCardProps {
  artifact: ArtifactWithTask;
  projectId?: string;
  onExpandImage: (artifact: ArtifactWithTask) => void;
}

function TaskArtifactCard({ artifact, projectId, onExpandImage }: TaskArtifactCardProps) {
  const { t } = useTranslation("app");
  const mediaUrl = artifactMediaUrl(artifact.id, projectId);
  const typeLabel = getArtifactTypeLabel(t, artifact.type);
  const preview = artifact.content ? getContentPreview(artifact.content, 320) : artifact.description;
  const title = artifact.title || t("documents.untitledArtifact", "Untitled artifact");

  return (
    <article className="document-card documents-artifact-card" aria-label={t("documents.artifactCardLabel", "Artifact {{title}}", { title })}>
      {artifact.type === "image" ? (
        <button
          type="button"
          className="documents-artifact-preview documents-artifact-preview--expandable"
          onClick={() => onExpandImage(artifact)}
          aria-label={t("documents.expandImageArtifact", "Expand image artifact {{title}}", { title })}
        >
          <ArtifactMedia artifact={artifact} mediaUrl={mediaUrl} title={title} preview={preview} t={t} />
          <span className="documents-artifact-expand-hint">{t("documents.expandArtifactHint", "Click to expand")}</span>
        </button>
      ) : (
        <div className="documents-artifact-preview">
          <ArtifactMedia artifact={artifact} mediaUrl={mediaUrl} title={title} preview={preview} t={t} />
        </div>
      )}
      <div className="documents-artifact-body">
        <div className="documents-artifact-header">
          <span className="documents-artifact-type-badge">{typeLabel}</span>
          <span className="documents-artifact-author">{artifact.authorId}</span>
        </div>
        <h5 className="documents-artifact-title">{title}</h5>
        {artifact.description && <p className="documents-artifact-description">{artifact.description}</p>}
        <div className="documents-artifact-meta">
          <span>{formatTimestamp(artifact.createdAt)}</span>
          {artifact.sizeBytes !== undefined && <span>{formatFileSize(artifact.sizeBytes)}</span>}
        </div>
      </div>
    </article>
  );
}

export function TaskDocumentsTab({
  taskId,
  addToast,
  onTaskUpdated: _onTaskUpdated,
  projectId,
  canEdit = false,
}: TaskDocumentsTabProps) {
  const { t } = useTranslation("app");
  const [documents, setDocuments] = useState<TaskDocument[]>([]);
  const [loading, setLoading] = useState(true);
  const [expandedDocKeys, setExpandedDocKeys] = useState<Set<string>>(() => new Set());
  const [revisionContentByKey, setRevisionContentByKey] = useState<Record<string, string>>({});
  const [editingDocKey, setEditingDocKey] = useState<string | null>(null);
  const [editContent, setEditContent] = useState("");
  const [showHistory, setShowHistory] = useState<string | null>(null);
  const [revisions, setRevisions] = useState<TaskDocumentRevision[]>([]);
  const [loadingRevisions, setLoadingRevisions] = useState(false);
  const [showCreateForm, setShowCreateForm] = useState(false);
  const [newDocKey, setNewDocKey] = useState("");
  const [newDocContent, setNewDocContent] = useState("");
  const [saving, setSaving] = useState(false);
  const [deletingKey, setDeletingKey] = useState<string | null>(null);
  const [confirmDelete, setConfirmDelete] = useState<string | null>(null);
  /*
   * FNXC:ArtifactRegistry 2026-07-11-00:00:
   * FN-7833 makes task Artifacts-tab documents readable without extra clicks: render Markdown by default and persist the operator's Markdown/Plain preference for future task document views.
   */
  const [renderMarkdown, setRenderMarkdown] = useState<boolean>(() => readBooleanPref(TASK_DOCUMENTS_MARKDOWN_TOGGLE_STORAGE_KEY, true));
  /*
   * FNXC:ArtifactRegistry 2026-06-29-00:00:
   * Task detail image artifacts must be viewable in-place from the task modal. Keep the expand target image-only so document, audio, video, and generic cards retain their current non-lightbox behavior without empty controls.
   */
  const [lightboxArtifact, setLightboxArtifact] = useState<ArtifactWithTask | null>(null);
  const lightboxDialogRef = useRef<HTMLDivElement>(null);
  const lightboxCloseRef = useRef<HTMLButtonElement>(null);
  const lightboxReturnFocusRef = useRef<HTMLElement | null>(null);
  const loadedTaskIdRef = useRef(taskId);
  const documentKeysRef = useRef<Set<string>>(new Set());
  const { artifacts, loading: artifactsLoading, error: artifactsError } = useArtifacts({ projectId, taskId });

  const loadDocuments = useCallback(async () => {
    try {
      const docs = await fetchTaskDocuments(taskId, projectId);
      const previousKeys = loadedTaskIdRef.current === taskId ? documentKeysRef.current : new Set<string>();
      const nextKeys = new Set(docs.map((doc) => doc.key));
      loadedTaskIdRef.current = taskId;
      documentKeysRef.current = nextKeys;
      setDocuments(docs);
      setExpandedDocKeys((current) => {
        const next = new Set<string>();
        for (const doc of docs) {
          if (current.has(doc.key) || !previousKeys.has(doc.key)) {
            next.add(doc.key);
          }
        }
        return next;
      });
      setRevisionContentByKey((current) => Object.fromEntries(Object.entries(current).filter(([key]) => nextKeys.has(key))));
    } catch (error) {
      addToast(getErrorMessage(error) || t("taskDocuments.failedToLoad", "Failed to load documents"), "error");
    } finally {
      setLoading(false);
    }
  }, [taskId, projectId, addToast]);

  useEffect(() => {
    void loadDocuments();
  }, [loadDocuments]);

  useEffect(() => {
    if (artifactsError) {
      addToast(artifactsError || t("taskDocuments.failedToLoadArtifacts", "Failed to load artifacts"), "error");
    }
  }, [addToast, artifactsError, t]);

  useEffect(() => {
    writeBooleanPref(TASK_DOCUMENTS_MARKDOWN_TOGGLE_STORAGE_KEY, renderMarkdown);
  }, [renderMarkdown]);

  function handleExpandDocument(doc: TaskDocument) {
    const isExpanded = expandedDocKeys.has(doc.key);
    setExpandedDocKeys((current) => {
      const next = new Set(current);
      if (isExpanded) {
        next.delete(doc.key);
      } else {
        next.add(doc.key);
      }
      return next;
    });
    if (isExpanded) {
      if (editingDocKey === doc.key) {
        setEditingDocKey(null);
        setEditContent("");
      }
      if (showHistory === doc.key) {
        setShowHistory(null);
        setRevisions([]);
      }
    }
  }

  async function handleToggleHistory(docKey: string) {
    if (showHistory === docKey) {
      setShowHistory(null);
      setRevisions([]);
    } else {
      setShowHistory(docKey);
      setLoadingRevisions(true);
      try {
        const revs = await fetchTaskDocumentRevisions(taskId, docKey, projectId);
        setRevisions(revs);
      } catch (error) {
        addToast(getErrorMessage(error) || t("taskDocuments.failedToLoadRevisions", "Failed to load revisions"), "error");
      } finally {
        setLoadingRevisions(false);
      }
    }
  }

  function handleStartEdit(doc: TaskDocument) {
    setEditingDocKey(doc.key);
    setEditContent(revisionContentByKey[doc.key] ?? doc.content);
  }

  function handleCancelEdit() {
    setEditingDocKey(null);
    setEditContent("");
  }

  async function handleSaveEdit() {
    if (!editingDocKey || !editContent.trim()) return;
    setSaving(true);
    try {
      await putTaskDocument(taskId, editingDocKey, editContent, {}, projectId);
      setEditingDocKey(null);
      setEditContent("");
      setRevisionContentByKey((current) => {
        const next = { ...current };
        delete next[editingDocKey];
        return next;
      });
      await loadDocuments();
      addToast(t("taskDocuments.saved", "Document saved"), "success");
    } catch (error) {
      addToast(getErrorMessage(error) || t("taskDocuments.failedToSave", "Failed to save document"), "error");
    } finally {
      setSaving(false);
    }
  }

  async function handleCreateDocument() {
    const key = newDocKey.trim();
    const content = newDocContent.trim();

    // Validate key
    if (!key) {
      addToast(t("taskDocuments.keyRequired", "Document key is required"), "error");
      return;
    }
    if (!DOCUMENT_KEY_REGEX.test(key)) {
      addToast(t("taskDocuments.invalidKeyFormat", "Invalid key format. Use 1-64 alphanumeric characters, hyphens, or underscores."), "error");
      return;
    }
    if (!content) {
      addToast(t("taskDocuments.contentRequired", "Content is required"), "error");
      return;
    }

    setSaving(true);
    try {
      await putTaskDocument(taskId, key, content, {}, projectId);
      setShowCreateForm(false);
      setNewDocKey("");
      setNewDocContent("");
      await loadDocuments();
      addToast(t("taskDocuments.created", "Document created"), "success");
    } catch (error) {
      addToast(getErrorMessage(error) || t("taskDocuments.failedToCreate", "Failed to create document"), "error");
    } finally {
      setSaving(false);
    }
  }

  async function handleDeleteDocument(key: string) {
    setDeletingKey(key);
    try {
      await deleteTaskDocument(taskId, key, projectId);
      setConfirmDelete(null);
      setDeletingKey(null);
      setExpandedDocKeys((current) => {
        const next = new Set(current);
        next.delete(key);
        return next;
      });
      setRevisionContentByKey((current) => {
        const next = { ...current };
        delete next[key];
        return next;
      });
      if (showHistory === key) {
        setShowHistory(null);
        setRevisions([]);
      }
      await loadDocuments();
      addToast(t("taskDocuments.deleted", "Document deleted"), "success");
    } catch (error) {
      addToast(getErrorMessage(error) || t("taskDocuments.failedToDelete", "Failed to delete document"), "error");
    } finally {
      setDeletingKey(null);
    }
  }

  function handleViewRevision(docKey: string, revision: TaskDocumentRevision) {
    setRevisionContentByKey((current) => ({ ...current, [docKey]: revision.content }));
    setEditingDocKey(null);
    setEditContent("");
  }

  const handleExpandArtifactImage = useCallback((artifact: ArtifactWithTask) => {
    lightboxReturnFocusRef.current = document.activeElement instanceof HTMLElement ? document.activeElement : null;
    setLightboxArtifact(artifact);
  }, []);

  const handleCloseLightbox = useCallback(() => {
    setLightboxArtifact(null);
    lightboxReturnFocusRef.current?.focus();
    lightboxReturnFocusRef.current = null;
  }, []);

  useEffect(() => {
    if (!lightboxArtifact) {
      return;
    }

    const previousOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    lightboxCloseRef.current?.focus();

    const handleKeyDown = (event: globalThis.KeyboardEvent) => {
      if (event.key === "Escape") {
        event.preventDefault();
        handleCloseLightbox();
        return;
      }

      if (event.key !== "Tab") {
        return;
      }

      /*
       * FNXC:ArtifactRegistry 2026-06-29-17:08:
       * The artifact preview declares an aria-modal dialog, so keyboard focus must stay inside the lightbox until Escape, overlay click, or the close button dismisses it. Cycle Tab/Shift+Tab over current focusable controls instead of letting focus escape into the task-detail modal behind the overlay.
       */
      const dialog = lightboxDialogRef.current;
      const focusableElements = Array.from(dialog?.querySelectorAll<HTMLElement>(
        'a[href], button:not([disabled]), textarea:not([disabled]), input:not([disabled]), select:not([disabled]), [tabindex]:not([tabindex="-1"])',
      ) ?? []).filter((element) => element.getAttribute("aria-hidden") !== "true");

      if (!dialog || focusableElements.length === 0) {
        event.preventDefault();
        return;
      }

      const firstElement = focusableElements[0];
      const lastElement = focusableElements[focusableElements.length - 1];
      const activeElement = document.activeElement;

      if (event.shiftKey && activeElement === firstElement) {
        event.preventDefault();
        lastElement.focus();
      } else if (!event.shiftKey && activeElement === lastElement) {
        event.preventDefault();
        firstElement.focus();
      } else if (!dialog.contains(activeElement)) {
        event.preventDefault();
        firstElement.focus();
      }
    };

    document.addEventListener("keydown", handleKeyDown);
    return () => {
      document.body.style.overflow = previousOverflow;
      document.removeEventListener("keydown", handleKeyDown);
    };
  }, [handleCloseLightbox, lightboxArtifact]);

  const handleLightboxOverlayClick = useCallback((event: MouseEvent<HTMLDivElement>) => {
    if (event.target === event.currentTarget) {
      handleCloseLightbox();
    }
  }, [handleCloseLightbox]);

  if (loading || artifactsLoading) {
    return (
      <div className="detail-section">
        <h4>{t("taskDocuments.heading", "Artifacts")}</h4>
        <div className="detail-log-empty"><LoadingSpinner label={t("taskDocuments.loading", "Loading documents and artifacts…")} /></div>
      </div>
    );
  }

  const isEmpty = documents.length === 0 && artifacts.length === 0 && !showCreateForm;

  return (
    <div className="detail-section">
      <h4>{t("taskDocuments.heading", "Artifacts")}</h4>

      {isEmpty && (
        <div className="detail-log-empty">
          {t("taskDocuments.noDocuments", "No documents or artifacts yet.")}
        </div>
      )}

      {/*
       * FNXC:ArtifactRegistry 2026-06-21-21:44:
       * The per-task Artifacts tab must surface both traditional task documents and agent-created media artifacts so users can inspect all task-scoped outputs without leaving the task modal.
       */}
      {artifacts.length > 0 && (
        <section className="task-artifacts-section" aria-labelledby="task-artifacts-heading">
          <div className="task-artifacts-section-header">
            <h5 id="task-artifacts-heading">{t("taskDocuments.artifactsSubheading", "Media artifacts")}</h5>
            <span className="task-artifacts-section-count">{t("taskDocuments.artifactCount", "{{count}} artifact{{plural}}", { count: artifacts.length, plural: artifacts.length === 1 ? "" : "s" })}</span>
          </div>
          <div className="documents-artifact-gallery documents-artifact-gallery--mobile task-artifacts-gallery">
            {artifacts.map((artifact) => (
              <TaskArtifactCard key={artifact.id} artifact={artifact} projectId={projectId} onExpandImage={handleExpandArtifactImage} />
            ))}
          </div>
        </section>
      )}

      <section className="task-documents-section" aria-labelledby="task-documents-heading">
        <div className="task-artifacts-section-header">
          <h5 id="task-documents-heading">{t("taskDocuments.documentsSubheading", "Task documents")}</h5>
          {documents.length > 0 && (
            <span className="task-artifacts-section-count">{t("taskDocuments.documentCount", "{{count}} document{{plural}}", { count: documents.length, plural: documents.length === 1 ? "" : "s" })}</span>
          )}
        </div>

      {/* Create Form */}
      {showCreateForm && (
        <div className="task-document-create-form">
          <h5>{t("taskDocuments.newDocumentTitle", "New Document")}</h5>
          <div className="form-group">
            <label htmlFor="doc-key">{t("taskDocuments.keyLabel", "Key")}</label>
            <input
              id="doc-key"
              type="text"
              className="task-document-key-input"
              value={newDocKey}
              onChange={(e) => setNewDocKey(e.target.value)}
              placeholder={t("taskDocuments.keyPlaceholder", "e.g., plan, notes, research")}
              disabled={saving}
            />
            <span className="form-hint">{t("taskDocuments.keyHint", "Alphanumeric, hyphens, underscores (1-64 chars)")}</span>
          </div>
          <div className="form-group">
            <label htmlFor="doc-content">{t("taskDocuments.contentLabel", "Content")}</label>
            <textarea
              id="doc-content"
              value={newDocContent}
              onChange={(e) => setNewDocContent(e.target.value)}
              rows={6}
              placeholder={t("taskDocuments.contentPlaceholder", "Enter document content…")}
              disabled={saving}
            />
          </div>
          <div className="form-actions">
            <button
              className="btn btn-sm"
              onClick={() => {
                setShowCreateForm(false);
                setNewDocKey("");
                setNewDocContent("");
              }}
              disabled={saving}
            >
              {t("taskDocuments.cancel", "Cancel")}
            </button>
            <button
              className="btn btn-primary btn-sm"
              onClick={() => void handleCreateDocument()}
              disabled={saving || !newDocKey.trim() || !newDocContent.trim()}
            >
              {saving ? t("taskDocuments.creating", "Creating…") : t("taskDocuments.create", "Create")}
            </button>
          </div>
        </div>
      )}

      {/* Document List */}
      {documents.length === 0 && !showCreateForm ? (
        !isEmpty && (
          <div className="detail-log-empty">
            {t("taskDocuments.noTaskDocuments", "No task documents yet.")}
          </div>
        )
      ) : (
        <div className="task-documents-list">
          {documents.map((doc) => {
            const isExpanded = expandedDocKeys.has(doc.key);
            const displayedContent = revisionContentByKey[doc.key] ?? doc.content;

            return (
            <div key={doc.key} className="task-document-card">
              <div className="task-document-card-header">
                <div className="task-document-card-title">
                  <FileText size={14} />
                  <span className="task-document-key">{doc.key}</span>
                  <span className="task-document-revision-badge">v{doc.revision}</span>
                </div>
                <div className="task-document-meta">
                  <span className="task-document-author">{doc.author}</span>
                  <span className="task-document-timestamp">{formatTimestamp(doc.updatedAt || doc.createdAt)}</span>
                </div>
              </div>

              {/* Expanded Content View */}
              {isExpanded && editingDocKey !== doc.key && (
                <>
                  <div className="task-document-content-header">
                    <button
                      className="btn btn-sm document-mode-toggle"
                      onClick={() => setRenderMarkdown((prev) => !prev)}
                      aria-label={renderMarkdown ? t("taskDocuments.switchToPlainText", "Switch to plain text") : t("taskDocuments.switchToMarkdown", "Switch to markdown")}
                      aria-pressed={renderMarkdown}
                      title={renderMarkdown ? t("taskDocuments.switchToPlainText", "Switch to plain text") : t("taskDocuments.switchToMarkdown", "Switch to markdown")}
                    >
                      {renderMarkdown ? t("taskDocuments.modeMarkdown", "Markdown") : t("taskDocuments.modePlain", "Plain")}
                    </button>
                  </div>
                  <div className="task-document-content">
                    {renderMarkdown ? (
                      <div className="task-document-content-markdown">
                        <div className="markdown-body">
                          <ReactMarkdown remarkPlugins={[remarkGfm]}>{displayedContent}</ReactMarkdown>
                        </div>
                      </div>
                    ) : (
                      <pre className="task-document-content-text">{displayedContent}</pre>
                    )}
                  </div>

                  {/* Revision History */}
                  {showHistory === doc.key && (
                    <div className="task-document-revisions">
                      <h5>{t("taskDocuments.revisionHistory", "Revision History")}</h5>
                      {loadingRevisions ? (
                        <div className="detail-log-empty"><LoadingSpinner label={t("taskDocuments.loadingRevisions", "Loading…")} /></div>
                      ) : revisions.length <= 1 ? (
                        <div className="detail-log-empty">{t("taskDocuments.noPreviousRevisions", "No previous revisions.")}</div>
                      ) : (
                        <div className="task-document-revision-list">
                          {revisions
                            .filter((r) => r.revision < doc.revision)
                            .sort((a, b) => b.revision - a.revision)
                            .map((revision) => (
                              <div
                                key={revision.id}
                                className="task-document-revision-item"
                                onClick={() => handleViewRevision(doc.key, revision)}
                              >
                                <div className="revision-header">
                                  <span className="revision-badge">v{revision.revision}</span>
                                  <span className="revision-author">{revision.author}</span>
                                  <span className="revision-timestamp">{formatTimestamp(revision.createdAt)}</span>
                                </div>
                                <div className="revision-preview">{getContentPreview(revision.content, 100)}</div>
                              </div>
                            ))}
                        </div>
                      )}
                    </div>
                  )}
                </>
              )}

              {/* Editing View */}
              {editingDocKey === doc.key && (
                <div className="task-document-edit-form">
                  <textarea
                    value={editContent}
                    onChange={(e) => setEditContent(e.target.value)}
                    rows={10}
                    disabled={saving}
                  />
                  <div className="form-actions">
                    <button className="btn btn-sm" onClick={handleCancelEdit} disabled={saving}>
                      {t("taskDocuments.cancel", "Cancel")}
                    </button>
                    <button
                      className="btn btn-primary btn-sm"
                      onClick={() => void handleSaveEdit()}
                      disabled={saving || !editContent.trim()}
                    >
                      {saving ? t("taskDocuments.saving", "Saving…") : t("taskDocuments.save", "Save")}
                    </button>
                  </div>
                </div>
              )}

              {/* Actions */}
              <div className="task-document-actions">
                <button
                  className="btn btn-sm"
                  onClick={() => handleExpandDocument(doc)}
                >
                  {isExpanded ? (
                    <>
                      <ChevronUp size={14} /> {t("taskDocuments.collapse", "Collapse")}
                    </>
                  ) : (
                    <>
                      <ChevronDown size={14} /> {t("taskDocuments.expand", "Expand")}
                    </>
                  )}
                </button>

                {isExpanded && (
                  <>
                    <button
                      className="btn btn-sm"
                      onClick={() => void handleToggleHistory(doc.key)}
                    >
                      <History size={14} /> {t("taskDocuments.history", "History")}
                    </button>

                    {canEdit && editingDocKey !== doc.key && (
                      <button className="btn btn-sm" onClick={() => handleStartEdit(doc)}>
                        {t("taskDocuments.edit", "Edit")}
                      </button>
                    )}

                    {canEdit && (
                      confirmDelete === doc.key ? (
                        <div className="confirm-delete-actions">
                          <span>{t("taskDocuments.deleteConfirm", "Delete?")}</span>
                          <button
                            className="btn btn-danger btn-sm"
                            onClick={() => void handleDeleteDocument(doc.key)}
                            disabled={deletingKey === doc.key}
                          >
                            {deletingKey === doc.key ? "…" : t("taskDocuments.yes", "Yes")}
                          </button>
                          <button
                            className="btn btn-sm"
                            onClick={() => setConfirmDelete(null)}
                            disabled={deletingKey === doc.key}
                          >
                            {t("taskDocuments.no", "No")}
                          </button>
                        </div>
                      ) : (
                        <button
                          className="btn btn-danger btn-sm"
                          onClick={() => setConfirmDelete(doc.key)}
                        >
                          <Trash2 size={14} />
                        </button>
                      )
                    )}
                  </>
                )}
              </div>
            </div>
            );
          })}
        </div>
      )}

      {/* New Document Button */}
      {canEdit && !showCreateForm && (
        <button
          className="btn btn-sm task-document-new-btn"
          onClick={() => setShowCreateForm(true)}
        >
          <Plus size={14} /> {t("taskDocuments.newDocumentButton", "New Document")}
        </button>
      )}
      </section>

      {lightboxArtifact && (
        <div
          ref={lightboxDialogRef}
          className="modal-overlay open documents-artifact-lightbox-overlay"
          role="dialog"
          aria-modal="true"
          aria-label={t("documents.lightboxLabel", "Artifact media preview")}
          onClick={handleLightboxOverlayClick}
        >
          <div className="documents-artifact-lightbox" onClick={(event) => event.stopPropagation()}>
            <div className="documents-artifact-lightbox-header">
              <h3 className="documents-artifact-lightbox-title">{lightboxArtifact.title || t("documents.untitledArtifact", "Untitled artifact")}</h3>
              <button ref={lightboxCloseRef} className="modal-close" onClick={handleCloseLightbox} aria-label={t("documents.closeLightbox", "Close artifact preview")}>
                <X size={20} />
              </button>
            </div>
            <div className="documents-artifact-lightbox-media-frame">
              <img
                className="documents-artifact-lightbox-media"
                src={artifactMediaUrl(lightboxArtifact.id, projectId)}
                alt={lightboxArtifact.title || t("documents.untitledArtifact", "Untitled artifact")}
              />
            </div>
          </div>
        </div>
      )}
    </div>
  );
}