import { stat, readFile } from "node:fs/promises";
import path from "node:path";
import { NextRequest, NextResponse } from "next/server";
import { resolveAudioFilePath } from "@/lib/audio";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

type RouteContext = {
  params: Promise<{ path: string[] }>;
};

export async function GET(_request: NextRequest, context: RouteContext) {
  const { path: audioPath } = await context.params;
  const filePath = resolveAudioFilePath(audioPath);

  if (!filePath || path.extname(filePath).toLowerCase() !== ".mp3") {
    return new NextResponse("Not found", { status: 404 });
  }

  try {
    const fileStat = await stat(filePath);
    if (!fileStat.isFile()) {
      return new NextResponse("Not found", { status: 404 });
    }

    const file = await readFile(filePath);
    return new NextResponse(new Uint8Array(file), {
      headers: {
        "Content-Type": "audio/mpeg",
        "Content-Length": String(fileStat.size),
        "Cache-Control": "public, max-age=31536000, immutable",
      },
    });
  } catch {
    return new NextResponse("Not found", { status: 404 });
  }
}