import { NextResponse } from "next/server";
import { readFile } from "fs/promises";
import { existsSync } from "fs";
import path from "path";

export const dynamic = "force-dynamic";

const MEDIA_DIR = "public/assets/images/media";
const ALLOWED_EXT = [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg", ".bmp"];

export async function GET(_request: Request, { params }: { params: Promise<{ path: string[] }> }) {
  const { path: segments } = await params;
  const name = segments.join("/");
  // Prevent path traversal
  if (name.includes("..") || name.includes("\\")) {
    return new NextResponse("Forbidden", { status: 403 });
  }
  const ext = path.extname(name).toLowerCase();
  if (!ALLOWED_EXT.includes(ext)) {
    return new NextResponse("Forbidden", { status: 403 });
  }

  const baseDir = path.resolve(process.cwd(), MEDIA_DIR);
  const filePath = path.resolve(baseDir, name);
  if (!filePath.startsWith(baseDir + path.sep)) {
    return new NextResponse("Forbidden", { status: 403 });
  }
  // eslint-disable-next-line security/detect-non-literal-fs-filename
  if (!existsSync(filePath)) {
    return new NextResponse("Not found", { status: 404 });
  }

  // eslint-disable-next-line security/detect-non-literal-fs-filename
  const bytes = await readFile(filePath);
  const mime: Record<string, string> = {
    ".png": "image/png",
    ".jpg": "image/jpeg",
    ".jpeg": "image/jpeg",
    ".gif": "image/gif",
    ".webp": "image/webp",
    ".svg": "image/svg+xml",
    ".bmp": "image/bmp",
  };

  return new NextResponse(bytes, {
    headers: {
      // eslint-disable-next-line security/detect-object-injection -- ext validated against ALLOWED_EXT
      "Content-Type": mime[ext] ?? "application/octet-stream",
      "Cache-Control": "public, max-age=86400",
    },
  });
}