import { NextRequest, NextResponse } from "next/server";
import { auth, getAuthSession } from "@/lib/auth";
import { fetchVanillaVersions, fetchPaperVersions, fetchFabricVersions, type VersionInfo } from "@/lib/minecraft/versions";
import { checkRateLimit, getClientIp } from "@/lib/security/rateLimit";

export async function GET(req: NextRequest) {
  const session = await getAuthSession(req.headers);
  if (!session) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });

  const ip = getClientIp(req);
  const { allowed } = checkRateLimit(ip, 20);
  if (!allowed) return NextResponse.json({ error: "Too many requests" }, { status: 429 });

  const type = req.nextUrl.searchParams.get("type") ?? "vanilla";

  try {
    let versionInfos: VersionInfo[];
    switch (type) {
      case "paper":
        versionInfos = await fetchPaperVersions();
        break;
      case "fabric":
        versionInfos = await fetchFabricVersions();
        break;
      case "vanilla":
      default:
        versionInfos = await fetchVanillaVersions();
    }
    const versions = versionInfos.map((v) => v.id);
    return NextResponse.json({ versions, type });
  } catch (err) {
    const message = err instanceof Error ? err.message : "Failed to fetch versions";
    return NextResponse.json({ error: message }, { status: 503 });
  }
}