const promisify = require('util').promisify;
const path = require('path');
const fs = require('fs');
const readdirp = promisify(fs.readdir);
const statp = promisify(fs.stat);


async function countFileLines(file) {
    let count = 0;

    fs.createReadStream(file).on('data', function(chunk) {
        count += chunk.toString('utf8')
        .split(/\r\n|[\n\r\u0085\u2028\u2029]/g)
        .length-1;
    }).on('end', function() {
        lines += count;
        console.log(file, count);
        console.log(lines);
    }).on('error', function(err) {
        console.error(err);
    });
}

async function count(files) {
    for (let file of files) {
        await countFileLines(file, lines);
    }
}

async function scanDir(dir, results = []) {
    let files = await readdirp(dir);
    for (let f of files) {
        let fullPath = path.join(dir, f);
        let stat = await statp(fullPath);
        if (stat.isDirectory()) {
            await scanDir(fullPath, results);
        } else {
            results.push(fullPath);
        }
    }
    return results;
}

async function executeAsync(path) {
    await scanDir(path).then(files => count(files)).then(() => console.log(lines));
}

let lines = 0;
const start = new Date();

executeAsync('/Users/benroszko/Desktop/MyProjects/studia/SemestrV/TW/node/PAM08');