/*jshint latedef: nofunc */

// This is used to copy a folder (the test/less/* files & sub-folders), adding a BOM to the start of each LESS and CSS file. // This is a based on the copySync method from fs-extra (github.com/jprichardson/node-fs-extra/).

module.exports = function() {

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

var BUF_LENGTH = 64 * 1024;
var _buff = new Buffer(BUF_LENGTH);

function copyFolderWithBom(src, dest) {
    var stats = fs.lstatSync(src);
    var destFolder = path.dirname(dest);
    var destFolderExists = fs.existsSync(destFolder);
    var performCopy = false;

    if (stats.isFile()) {
        if (!destFolderExists) {
            fs.mkdirSync(destFolder);
        }
        if (src.match(/\.(css|less)$/)) {
            copyFileAddingBomSync(src, dest);
        } else {
            copyFileSync(src, dest);
        }
    }
    else if (stats.isDirectory()) {
        if (!fs.existsSync(destFolder)) {
            fs.mkdirSync(destFolder);
        }
        if (!fs.existsSync(dest)) {
            fs.mkdirSync(dest);
        }
        fs.readdirSync(src).forEach(function(d) {
            if (d !== 'bom') {
                copyFolderWithBom(path.join(src, d), path.join(dest, d));
            }
        });
    }
}

function copyFileAddingBomSync(srcFile, destFile) {
    var contents = fs.readFileSync(srcFile, { encoding: 'utf8' });
    if (!contents.length || contents.charCodeAt(0) !== 0xFEFF) {
        contents = '\ufeff' + contents;
    }
    fs.writeFileSync(destFile, contents, { encoding: 'utf8' });
}

function copyFileSync(srcFile, destFile) {
    var fdr = fs.openSync(srcFile, 'r');
    var stat = fs.fstatSync(fdr);
    var fdw = fs.openSync(destFile, 'w', stat.mode);
    var bytesRead = 1;
    var pos = 0;

    while (bytesRead > 0) {
        bytesRead = fs.readSync(fdr, _buff, 0, BUF_LENGTH, pos)
        fs.writeSync(fdw, _buff, 0, bytesRead);
        pos += bytesRead;
    }

    fs.closeSync(fdr);
    fs.closeSync(fdw);
}

return {
    copyFolderWithBom: copyFolderWithBom
};

};