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

function isDirectory(dirPath) {
    return fs.statSync(dirPath).isDirectory();
}

function endsWithExtension(file, extension) {
    return file.endsWith(extension);
}

class FileSearch {

    constructor(fileExtension, skipDirectories = null) {
        this.fileExtension = fileExtension || '';
        if (!fileExtension.includes('.')) {
            throw new Error('File extension should contain a dot (.)');
        }
        this.skipDirectories = skipDirectories || ['.vscode', '.git', 'node_modules'];
    }

    /* Function for borrow (namespace.js)*/
    /**
     *
     * @param {string} item - full path to the directory or a file
     */
    skipCurrentDirectory(item) {
        return this.skipDirectories.includes(item);
    }

    getFiles(dirPath, files) {
        files = files || [];

        var items = fs.readdirSync(dirPath);
        items.forEach(item => {
            if (this.skipCurrentDirectory(item)) {
                return;
            }
            var fullPath = path.join(dirPath, item);
            if (isDirectory(fullPath)) {
                files = this.getFiles(fullPath, files);
            } else if (endsWithExtension(item, this.fileExtension)) {
                files.push(fullPath);
            }
        });
        return files;
    }

}

module.exports = FileSearch;