gerbeur/src/components/category/CategoryManager.tsx

/**
 * Renders the editor of the site's categories, on the "manage" tab of one's own
 * profile for a user with the `category:manage` permission.
 *
 * @module
 */

import { useState } from "react";
import { t } from "@lingui/core/macro";
import { Trans } from "@lingui/react/macro";

import { API_URL } from "../../config/api.ts";
import { VALIDATION } from "../../../shared/validation.ts";
import type {
  Category,
  CreateCategoryRequest,
  UpdateCategoryRequest,
} from "../../../shared/category.ts";
import type { Wire } from "../../../shared/api.ts";
import { useAuth } from "../../hooks/auth/useAuth.ts";
import { useCategories } from "../../hooks/category/useCategories.ts";
import { ConfirmModal } from "../shared/ConfirmModal.tsx";
import { expectOk } from "../../utils/shared/api.ts";
import { FormError } from "../form/FormError.tsx";
import { FormProvider } from "react-hook-form";
import { SubmitButton } from "../form/SubmitButton.tsx";
import { useApiForm } from "../../hooks/form/useApiForm.ts";

interface CategoryFields {
  name: string;
  slug: string;
}

/**
 * The value of `editing` while a new category is being created. Its leading
 * space keeps it from matching a category id.
 */
const NEW = "new";

/**
 * Renders the categories as chips that open an inline editor, and a "+" chip
 * that creates one. Only one editor is open at a time. A change refetches the
 * app-wide list, so the feeds' category switcher follows. `UserPublicProfile`
 * shows it only to those who hold `category:manage`, and the server checks it
 * again.
 */
export function CategoryManager(): React.JSX.Element {
  const { categories, isLoaded, refresh } = useCategories();
  const [editing, setEditing] = useState<string | null>(null);

  const close = () => setEditing(null);
  const handleChanged = () => {
    refresh();
    close();
  };

  if (!isLoaded && categories.length === 0) {
    return (
      <p className="index-status">
        <Trans>Loading…</Trans>
      </p>
    );
  }

  return (
    <div className="category-chips">
      {categories.map((category) =>
        editing === category.id
          ? (
            <CategoryEditor
              key={category.id}
              category={category}
              onCancel={close}
              onChanged={handleChanged}
            />
          )
          : (
            <button
              key={category.id}
              type="button"
              className="category-chip"
              onClick={() => setEditing(category.id)}
              disabled={editing !== null}
              title={t`Edit ${category.name}`}
            >
              {category.name}
            </button>
          )
      )}

      {editing === NEW
        ? (
          <CategoryEditor
            onCancel={close}
            onChanged={handleChanged}
          />
        )
        : (
          <button
            type="button"
            className="category-chip category-chip--add"
            onClick={() => setEditing(NEW)}
            disabled={editing !== null}
            aria-label={t`Add category`}
            title={t`Add category`}
          >
            +
          </button>
        )}
    </div>
  );
}

interface CategoryEditorProps {
  /** Left out to create a category. */
  category?: Category;
  onCancel: () => void;
  onChanged: () => void;
}

/**
 * Renders the inline editor of a category's name and slug, which also deletes
 * it after a confirmation. A deleted category's dumps stay, without it.
 */
function CategoryEditor(
  { category, onCancel, onChanged }: CategoryEditorProps,
) {
  const isNew = category === undefined;
  const { authFetch } = useAuth();
  const form = useApiForm<CategoryFields>({
    defaultValues: { name: category?.name ?? "", slug: category?.slug ?? "" },
  });
  const name = form.watch("name");
  const slug = form.watch("slug");
  const { isDirty } = form.formState;
  const [deleting, setDeleting] = useState(false);
  const [confirmOpen, setConfirmOpen] = useState(false);

  const onSubmit = form.submit(async ({ name, slug }) => {
    const body = { name: name.trim(), slug: slug.trim() };
    await expectOk<Wire<Category>>(
      isNew
        ? await authFetch(`${API_URL}/api/categories`, {
          method: "POST",
          body: JSON.stringify(body satisfies CreateCategoryRequest),
        })
        : await authFetch(`${API_URL}/api/categories/${category.id}`, {
          method: "PUT",
          body: JSON.stringify(body satisfies UpdateCategoryRequest),
        }),
    );
    onChanged();
  });

  async function remove() {
    if (isNew) return;
    setConfirmOpen(false);
    form.clearErrors("root");
    setDeleting(true);
    try {
      await expectOk(
        await authFetch(`${API_URL}/api/categories/${category.id}`, {
          method: "DELETE",
        }),
      );
      onChanged();
    } catch (err) {
      form.setError("root", {
        message: err instanceof Error ? err.message : t`Failed to delete`,
      });
      setDeleting(false);
    }
  }

  // An edit must change something.
  const canSave = !deleting && name.trim() !== "" && slug.trim() !== "" &&
    (isNew || isDirty);

  return (
    <FormProvider {...form}>
      <div className="category-editor-wrap">
        <form
          className="category-editor"
          onSubmit={onSubmit}
          onKeyDown={(e) => {
            if (e.key === "Escape") onCancel();
          }}
        >
          <input
            className="category-editor-input category-editor-input--name"
            type="text"
            placeholder={t`Name`}
            aria-label={t`Name`}
            maxLength={VALIDATION.CATEGORY_NAME_MAX}
            disabled={deleting}
            autoFocus
            {...form.register("name")}
          />
          <span className="category-editor-sep" aria-hidden>
            /
          </span>
          <input
            className="category-editor-input category-editor-input--slug"
            type="text"
            placeholder={t`slug`}
            aria-label={t`URL slug`}
            maxLength={VALIDATION.CATEGORY_SLUG_MAX}
            disabled={deleting}
            {...form.register("slug")}
          />
          <div className="category-editor-actions">
            <SubmitButton
              className="category-editor-btn category-editor-btn--save"
              pendingLabel="…"
              disabled={!canSave}
              aria-label={t`Save`}
            >
              ✓
            </SubmitButton>
            <button
              type="button"
              className="category-editor-btn"
              onClick={onCancel}
              disabled={deleting}
              title={t`Cancel`}
              aria-label={t`Cancel`}
            >
              ✕
            </button>
            {!isNew && (
              <button
                type="button"
                className="category-editor-btn category-editor-btn--delete"
                onClick={() => setConfirmOpen(true)}
                disabled={deleting}
                title={t`Delete`}
                aria-label={t`Delete`}
              >
                🗑
              </button>
            )}
          </div>
        </form>
        <FormError
          title={isNew
            ? t`Failed to create category`
            : t`Failed to save category`}
        />
      </div>
      {confirmOpen && category && (
        <ConfirmModal
          message={t`Delete category "${category.name}"? This cannot be undone.`}
          confirmLabel={t`Delete category`}
          onConfirm={remove}
          onCancel={() => setConfirmOpen(false)}
        />
      )}
    </FormProvider>
  );
}