import { useId } from "react";
import { useTranslation } from "react-i18next";

import type { components } from "../api/schema";
import { useConfig } from "../config/config-context";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

type LabelInput = components["schemas"]["LabelInput"];

/** Single-language label editor. Authors one label at the instance default language.
 *  Editing only touches the default-language entry — labels in other languages on the
 *  same record are preserved (not collapsed), so editing a term/authority that already
 *  has e.g. an English label keeps it. */
export function LabelEditor({
  value,
  onChange,
}: {
  value: LabelInput[];
  onChange: (labels: LabelInput[]) => void;
}) {
  const { t } = useTranslation();
  const inputId = useId();
  const { default_language } = useConfig();

  const current = value.find((l) => l.lang === default_language)?.label ?? "";
  const hasOtherLanguages = value.some((l) => l.lang !== default_language);

  const set = (label: string) =>
    onChange([
      ...value.filter((l) => l.lang !== default_language),
      ...(label.trim() ? [{ lang: default_language, label }] : []),
    ]);

  return (
    <div className="space-y-1">
      <Label htmlFor={inputId}>{t("labels.label")}</Label>
      <Input id={inputId} value={current} onChange={(e) => set(e.target.value)} />
      {hasOtherLanguages && (
        <p className="text-xs text-muted-foreground">{t("labels.otherLanguages")}</p>
      )}
    </div>
  );
}