"use strict";

let native = null;

try {
    native = require("../../native/tcp_keepalive/build/Release/tcp_keepalive_native");
} catch (err) {
    native = null;
}

function parseKeepAliveProbes(value) {
    if (value === undefined || value === null || value === "") {
        return 0;
    }

    value = Number(value);
    if (!Number.isFinite(value) || value < 0) {
        return 0;
    }

    return Math.floor(value);
}

function setKeepAliveProbes(socket, probes) {
    if (!native || probes <= 0 || !socket || !socket._handle) {
        return false;
    }

    const fd = socket._handle.fd;
    if (!Number.isInteger(fd) || fd < 0) {
        return false;
    }

    return native.setKeepAliveProbes(fd, probes) === true;
}

module.exports = {
    available: !!native,
    parseKeepAliveProbes,
    setKeepAliveProbes
};