"use client";

import { useState } from "react";
import { AttachmentLightbox } from "./AttachmentLightbox";
import { categoryFromMime, resolveMime } from "@/lib/mime.mjs";

/**
 * Render an attachment row in the staff report with the right affordance
 * for its type:
 *
 *   - image / pdf -> button opens the inline lightbox
 *   - office     -> download link + "View in Google Docs" secondary link
 *   - other      -> plain download link
 *
 * The proxy URL is `/api/staff/file?id=&org=&key=` (re-streams with
 * Content-Disposition: inline for previews, or `&dl=1` for downloads). The
 * Civi-signed URL (carrying its short-lived fcs JWT) is passed straight to
 * Google's Docs Viewer for office files; we deliberately don't proxy that
 * one because Google's servers must fetch it without our staff key.
 */
export function FileLink({
  fileId,
  fileName,
  civiSignedUrl,
  mime: explicitMime,
  org,
  authKey,
  civiBaseUrl,
}: {
  fileId: number | string;
  fileName: string;
  /** From Attachment.get (includes fcs). Used for office Google Viewer + download fallback. */
  civiSignedUrl?: string;
  mime?: string;
  org: number;
  authKey: string;
  civiBaseUrl: string;
}) {
  const [open, setOpen] = useState(false);

  const mime = resolveMime(explicitMime, fileName);
  const category = categoryFromMime(mime);

  const proxyBase =
    `/api/staff/file?id=${encodeURIComponent(String(fileId))}` +
    `&org=${encodeURIComponent(String(org))}` +
    `&key=${encodeURIComponent(authKey)}`;
  const previewSrc = proxyBase;
  // Prefer Civi's signed URL for downloads when present (one fewer hop
  // through our Lambda); the proxy is the fallback.
  const downloadHref = civiSignedUrl
    ? absUrl(civiSignedUrl, civiBaseUrl)
    : `${proxyBase}&dl=1`;

  const linkClass =
    "text-ink underline decoration-rule underline-offset-4 hover:decoration-ink";

  if (category === "image" || category === "pdf") {
    return (
      <>
        <button
          type="button"
          onClick={() => setOpen(true)}
          className={
            "bg-transparent p-0 text-left " +
            linkClass +
            " focus:outline-none focus-visible:ring-2 focus-visible:ring-leaf-700"
          }
        >
          {fileName}
        </button>
        <AttachmentLightbox
          open={open}
          onClose={() => setOpen(false)}
          previewSrc={previewSrc}
          downloadHref={downloadHref}
          filename={fileName}
          mime={mime}
        />
      </>
    );
  }

  if (category === "office") {
    // Google Docs Viewer renders DOC/DOCX/XLS/XLSX in a new tab. It fetches
    // the source URL server-side, so the URL must be reachable without our
    // staff key — that's why we pass the Civi-signed URL straight through.
    const gview = civiSignedUrl
      ? `https://docs.google.com/viewer?url=${encodeURIComponent(absUrl(civiSignedUrl, civiBaseUrl))}`
      : null;
    return (
      <span className="inline-flex flex-wrap items-baseline gap-x-2 gap-y-1">
        <a
          href={downloadHref}
          target="_blank"
          rel="noopener noreferrer"
          className={linkClass}
        >
          {fileName}
        </a>
        {gview && (
          <a
            href={gview}
            target="_blank"
            rel="noopener noreferrer"
            title="Opens in Google Docs Viewer (file bytes are sent to Google to render)"
            className="text-xs font-medium text-leaf-700 underline decoration-rule underline-offset-4 hover:decoration-ink hover:text-leaf-800"
          >
            View in Google Docs
          </a>
        )}
      </span>
    );
  }

  // "other" — unknown types: just a download link.
  return (
    <a
      href={downloadHref}
      target="_blank"
      rel="noopener noreferrer"
      className={linkClass}
    >
      {fileName}
    </a>
  );
}

function absUrl(u: string, base: string): string {
  if (u.startsWith("http")) return u;
  if (!base) return u;
  return `${base.replace(/\/+$/, "")}${u.startsWith("/") ? "" : "/"}${u}`;
}