#!/usr/bin/env node
import { spawn } from "child_process"
import fs from "fs"
import path from "path"
import { fileURLToPath } from "url"

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const KERNEL = path.join(__dirname, "../kernel/kernel.js")
const PID_FILE = "/tmp/forms.pid"

const cmd = process.argv[2]

if (cmd === "start") {
    if (fs.existsSync(PID_FILE)) {
        console.log("forms kernel already running")
        process.exit(0)
    }

    const proc = spawn("node", [KERNEL], {
        detached: true,
        stdio: "ignore"
    })

    proc.unref()
    fs.writeFileSync(PID_FILE, String(proc.pid))
    console.log("forms kernel started")
}

if (cmd === "stop") {
    if (!fs.existsSync(PID_FILE)) {
        console.log("forms kernel not running")
        process.exit(0)
    }

    const pid = Number(fs.readFileSync(PID_FILE))
    process.kill(pid)
    fs.unlinkSync(PID_FILE)
    console.log("forms kernel stopped")
}

if (!cmd) {
    console.log("usage: forms start | stop")
}