import { NextRequest, NextResponse } from "next/server";
import { spawn } from "node:child_process";
import { findVideosForCode } from "@/lib/video";
import { assertLocalRequest } from "@/lib/api/localOnly";

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

/**
 * Open the OS file manager pre-selected on the cover's video file.
 * Local-only — explicitly gated by assertLocalRequest.
 */
export async function POST(req: NextRequest, ctx: { params: Promise<{ code: string }> }) {
  const blocked = assertLocalRequest(req);
  if (blocked) return blocked;

  const { code } = await ctx.params;
  const decoded = decodeURIComponent(code);
  const url = new URL(req.url);
  const partRaw = url.searchParams.get("part");
  const part = partRaw == null ? 0 : Math.max(0, parseInt(partRaw, 10) || 0);

  const files = findVideosForCode(decoded);
  if (files.length === 0) return NextResponse.json({ error: "not found" }, { status: 404 });
  const file = files[Math.min(part, files.length - 1)];

  try {
    if (process.platform === "win32") {
      // explorer doesn't return zero-exit even on success; detach and don't await.
      spawn("explorer", ["/select,", file.abs], { detached: true, stdio: "ignore" }).unref();
    } else if (process.platform === "darwin") {
      spawn("open", ["-R", file.abs], { detached: true, stdio: "ignore" }).unref();
    } else {
      // Linux: open the parent dir; most file managers don't have a select API.
      const parent = file.abs.replace(/[/\\][^/\\]*$/, "");
      spawn("xdg-open", [parent], { detached: true, stdio: "ignore" }).unref();
    }
    return NextResponse.json({ ok: true, path: file.abs });
  } catch (e) {
    return NextResponse.json({ error: (e as Error).message }, { status: 500 });
  }
}