import { NextRequest, NextResponse } from "next/server";
import { readFileSync, existsSync } from "fs";
import { auth } from "@/lib/auth";

export const dynamic = "force-dynamic";

const ANALYTICS_FILE = "/home/minecraft/server/analytics.jsonl";

type MetricEntry = {
  ts: string;
  tps: number;
  ramUsedMB: number;
  ramTotalMB: number;
  cpuPercent: number;
  playersOnline: number;
  players: string[];
};

export async function GET(req: NextRequest) {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 403 });
  }

  const hours = Math.min(
    parseInt(req.nextUrl.searchParams.get("hours") || "6"),
    48
  );

  if (!existsSync(ANALYTICS_FILE)) {
    return NextResponse.json([]);
  }

  try {
    const lines = readFileSync(ANALYTICS_FILE, "utf8")
      .split("\n")
      .filter(Boolean);

    const cutoff = new Date(Date.now() - hours * 60 * 60 * 1000).toISOString();

    const entries: MetricEntry[] = [];
    for (const line of lines) {
      try {
        const entry = JSON.parse(line) as MetricEntry;
        if (entry.ts >= cutoff) entries.push(entry);
      } catch {}
    }

    return NextResponse.json(entries);
  } catch (e) {
    return NextResponse.json(
      { error: (e as Error).message },
      { status: 500 }
    );
  }
}