const logger = require('./logger.js');
const spawn = require('child_process').spawn;
const sudo = require('sudo');

async function execute(command, args, useSudo, returnOnClose) {
    if (command === undefined || command.length === 0) {
        return;
    }
    if (returnOnClose === undefined) {
        returnOnClose = false;
    }
    let startTime = new Date().getTime();
    let resultData = "";
    let resultError = "";
    command = command.trim();
    let process;
    if (useSudo) {
        logger.debug('executing sudo command \'' + command + '\' (args: \'' + args + '\')...');
        args.unshift(command);
        process = sudo(args, { cachePassword: true, prompt: 'sudo password:' });
    } else {
        logger.debug('executing command \'' + command + '\' (args: \'' + args + '\')...');
        process = spawn(command, args);
    }
    process.stdout.on('data', (data) => {
        resultData += data;
    });
    process.stderr.on('data', (data) => {
        resultError += data;
    });
    process.on('spawn', () => {
        logger.info('spawned command \'' + command + '\' (args: \'' + args + '\')');
        if (!returnOnClose) {
            return;
        }
    });
    process.on('error', (err) => {
        throw new Error(err);
    });
    process.on('close', (code) => {
        let msg = 'command \'' + command + '\' (args: \'' + args + '\') finished with exit code ' + code + ' after ' + (new Date().getTime() - startTime) + 'ms';
        if (resultData.length > 0) {
            msg += " > data: " + resultData;
        }
        if (resultError.length > 0) {
            msg += " >>> error: " + resultError;
            logger.error(msg)
            return;
        }
        logger.debug(msg);
        if (returnOnClose) {
            return;
        }
    });
}

module.exports = {
    execute
}