const crypto = require('crypto');
const { open } = require('fs/promises');

function isEnabled(parameter) {
    return isSet(parameter?.enabled) && parameter.enabled === true;
}

function isDisabled(parameter) {
    return isSet(parameter?.enabled) && parameter.enabled === false;
}

function isSet(parameter) {
    return parameter !== undefined;
}

function isUnset(parameter) {
    return !isSet(parameter);
}

async function sleep(ms) {
    if (isNaN(ms)) {
        return;
    }
    return new Promise((resolve, reject) => {
        setTimeout(resolve, ms);
    });
}

async function md5(file) {
    if (file === undefined) {
        return;
    }
    let buffer;
    let filehandle;
    try {
        filehandle = await open(file);
        buffer = await filehandle.readFile();
    } catch (error) {
        logger.error('encountered an error generating the md5 hash sum for file \'' + file + '\' > ' + error);
    } finally {
        await filehandle?.close();
    }
    if (buffer === undefined) {
        return;
    }
    let md5 = crypto.createHash('md5');
    md5.update(buffer);
    md5 = md5.digest('hex');
    return md5;
}

module.exports = {
    isEnabled,
    isDisabled,
    isSet,
    isUnset,
    sleep,
    md5
}