"use client";

import { NEXT_PUBLIC_API_URL } from "@/config/api";
import { clientAuthFetch } from "@/app/utils/clientAuthFetch";
import type { ExpiryItemFilter } from "@/app/api/stockIssue/actions";

/** Result tab currently shown; backend may filter the workbook by this bucket. */
export type ExpiryExportBucket = "expired" | "today" | "upcoming";

export interface ExportExpiryItemExcelParams extends ExpiryItemFilter {
  bucket?: ExpiryExportBucket;
}

/**
 * FP-MTMS Version Checklist | Functions Ref. No. 74 | v1.0.2 | 2026-09-07
 * GET /pickExecution/issues/expiryItem/excel
 * Query: itemCode, itemName, lotNo, daysAhead, bucket (expired|today|upcoming; omit for all categories)
 * Response: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
 * Optional Content-Disposition filename.
 */
export async function exportExpiryItemExcel(
  filters: ExportExpiryItemExcelParams,
): Promise<void> {
  const params = new URLSearchParams();
  if (filters.itemCode) params.set("itemCode", filters.itemCode);
  if (filters.itemName) params.set("itemName", filters.itemName);
  if (filters.lotNo) params.set("lotNo", filters.lotNo);
  if (filters.daysAhead != null) params.set("daysAhead", String(filters.daysAhead));
  if (filters.bucket) params.set("bucket", filters.bucket);

  const queryString = params.toString();
  const url = `${NEXT_PUBLIC_API_URL}/pickExecution/issues/expiryItem/excel${queryString ? `?${queryString}` : ""}`;

  const response = await clientAuthFetch(url, {
    method: "GET",
    headers: {
      Accept: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    },
  });

  if (response.status === 401 || response.status === 403) {
    throw new Error("Unauthorized");
  }
  if (!response.ok) {
    throw new Error(`HTTP error! status: ${response.status}`);
  }

  const blob = await response.blob();
  const downloadUrl = window.URL.createObjectURL(blob);
  const link = document.createElement("a");
  link.href = downloadUrl;

  const contentDisposition = response.headers.get("Content-Disposition");
  let fileName = "expiry-items.xlsx";
  if (contentDisposition?.includes("filename=")) {
    fileName = contentDisposition
      .split("filename=")[1]
      .split(";")[0]
      .replace(/"/g, "");
  }

  link.setAttribute("download", fileName);
  document.body.appendChild(link);
  link.click();
  link.remove();
  window.URL.revokeObjectURL(downloadUrl);
}