const fs = require('fs');
const path = require('path');

const inputDirNameArg = process.argv[2];
console.log('dossier:', inputDirNameArg)
const extensions = [];

function findFileExtensions(directory) {

    function traverseDirectory(dirPath) {
        fs.readdir(dirPath, (err, files) => {
            if (err) throw err;

            files.forEach((file) => {
                const filePath = path.join(dirPath, file);
                const stat = fs.lstatSync(filePath);

                if (stat.isFile()) {
                    const extension = path.extname(filePath).toLowerCase();

                    if (!extensions.includes(extension)) {
                        extensions.push(extension);
                    }

                } else if (stat.isDirectory() && !file.startsWith('.')) {
                    traverseDirectory(filePath);

                    console.log(extensions.length, extensions);
                }
            });

        });
    }

    traverseDirectory(directory);
}

findFileExtensions(inputDirNameArg);