"use client";

import { useTranslation } from "react-i18next";
import type { TFunction } from "i18next";
import type { ReportDefinition, ReportField } from "@/config/reportConfig";

/** FP-MTMS Version Checklist | Functions Ref. No. 69 | v1.0.2 | 2026-09-10 */
export function useReportLabels() {
  const { t, i18n } = useTranslation("report");

  const reportTitle = (report: Pick<ReportDefinition, "id" | "title">) =>
    t(`reports.${report.id}.title`, { defaultValue: report.title });

  const fieldLabel = (
    reportId: string,
    field: Pick<ReportField, "name" | "label">,
  ) =>
    t(`reports.${reportId}.fields.${field.name}`, {
      defaultValue: field.label,
    });

  const fieldHint = (reportId: string, fieldName: string, fallback = "") => {
    const key = `reports.${reportId}.fieldHints.${fieldName}`;
    if (!i18n.exists(key, { ns: "report" })) return fallback;
    return String(t(key, { defaultValue: fallback }));
  };

  const optionLabel = (
    reportId: string,
    fieldName: string,
    opt: { label: string; value: string },
  ) =>
    t(
      [
        `reports.${reportId}.options.${fieldName}.${opt.value}`,
        `options.${opt.value}`,
      ],
      { defaultValue: opt.label },
    );

  const categoryTitle = (id: string, fallback: string) =>
    t(`categories.${id}`, { defaultValue: fallback });

  return { t, i18n, reportTitle, fieldLabel, fieldHint, optionLabel, categoryTitle };
}

export function reportExcelT(
  t: TFunction | undefined,
  key: string,
  fallback: string,
): string {
  if (!t) return fallback;
  return String(t(key, { defaultValue: fallback }));
}