import { NextRequest, NextResponse } from "next/server";
import { execSync } from "child_process";
import { auth } from "@/lib/auth";

export const dynamic = "force-dynamic";

const SCRIPT = "/home/minecraft/dashboard/scripts/scheduled-restart.sh";
const CRON_MARKER = "# mc-scheduled-restart";

function getCurrentSchedule(): { enabled: boolean; hour: number; minute: number } | null {
  try {
    const crontab = execSync("crontab -l 2>/dev/null", { encoding: "utf8" });
    const match = crontab.match(
      new RegExp(`^(\\d+)\\s+(\\d+)\\s+\\*\\s+\\*\\s+\\*\\s+.*${CRON_MARKER.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}`, "m")
    );
    if (match) {
      return { enabled: true, minute: parseInt(match[1]), hour: parseInt(match[2]) };
    }
  } catch {}
  return null;
}

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

  const schedule = getCurrentSchedule();
  return NextResponse.json(schedule || { enabled: false, hour: 4, minute: 0 });
}

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

  const { enabled, hour, minute } = await req.json();

  try {
    // Get existing crontab without our entry
    let crontab = "";
    try {
      crontab = execSync("crontab -l 2>/dev/null", { encoding: "utf8" });
    } catch {}

    // Remove old entry
    const lines = crontab.split("\n").filter((l) => !l.includes(CRON_MARKER));

    if (enabled) {
      const h = Math.min(Math.max(parseInt(hour) || 4, 0), 23);
      const m = Math.min(Math.max(parseInt(minute) || 0, 0), 59);
      lines.push(`${m} ${h} * * * bash ${SCRIPT} ${CRON_MARKER}`);
    }

    const newCrontab = lines.filter(Boolean).join("\n") + "\n";
    const { writeFileSync, unlinkSync } = require("fs");
    const tmpFile = `/tmp/crontab-${Date.now()}.tmp`;
    writeFileSync(tmpFile, newCrontab, { mode: 0o600 });
    execSync(`crontab ${tmpFile}`, { encoding: "utf8" });
    unlinkSync(tmpFile);

    return NextResponse.json({
      ok: true,
      enabled,
      hour: parseInt(hour) || 4,
      minute: parseInt(minute) || 0,
    });
  } catch (e) {
    return NextResponse.json(
      { error: (e as Error).message },
      { status: 500 }
    );
  }
}