"use strict";

/*
 * systemdサービスの停止・起動・状態確認。restore.js がリストア前後に
 * Webサービス(既定 pleasanter)を安全に止める/戻すために使用する。
 */

const { spawn } = require("child_process");

function runSystemctl(args) {
    return new Promise((resolve, reject) => {
        const child = spawn("systemctl", args, { stdio: ["ignore", "pipe", "pipe"] });
        let stdout = "";
        let stderr = "";

        child.stdout.on("data", (d) => (stdout += d.toString("utf8")));
        child.stderr.on("data", (d) => (stderr += d.toString("utf8")));

        child.on("error", (err) => reject(new Error(`systemctl起動失敗: ${err.message}`)));
        child.on("close", (code) => {
            if (code !== 0) {
                reject(new Error(`systemctl ${args.join(" ")} 異常終了 (code=${code}): ${(stderr || stdout).trim()}`));
                return;
            }
            resolve({ stdout: stdout.trim(), stderr: stderr.trim() });
        });
    });
}

async function isServiceActive(serviceName) {
    try {
        const { stdout } = await runSystemctl(["is-active", serviceName]);
        return stdout === "active";
    } catch (_err) {
        return false;
    }
}

async function stopService(serviceName) {
    await runSystemctl(["stop", serviceName]);
}

async function startService(serviceName) {
    await runSystemctl(["start", serviceName]);
}

module.exports = { isServiceActive, stopService, startService };