using System.Text;

namespace CommonLibrary
{
    public static class Extensions
    {
        public static string PathCombineL(params string[] paths)
        {
            string directorySeparatorChar = System.IO.Path.AltDirectorySeparatorChar.ToString();
            return PathCombine(directorySeparatorChar, paths).Replace("\\", "/");
        }

        public static string PathCombineW(params string[] paths)
        {
            string directorySeparatorChar = System.IO.Path.DirectorySeparatorChar.ToString();
            return PathCombine(directorySeparatorChar, paths).Replace("/", "\\");
        }

        private static string PathCombine(string directorySeparator, params string[] paths)
        {
            if (paths.Length == 0)
            {
                return string.Empty;
            }

            StringBuilder path = new StringBuilder();
            path.Append(paths[0]);
            for (int i = 1; i < paths.Length; i++)
            {
                if (path.ToString().Substring(path.Length - 1, 1) == directorySeparator)
                {
                    if (paths[i].Substring(0, 1) == directorySeparator)
                    {
                        path.Append(paths[i].Substring(1, paths[i].Length - 1));
                    }
                    else
                    {
                        path.Append(paths[i]);
                    }
                }
                else
                {
                    if (paths[i].Substring(0, 1) == directorySeparator)
                    {
                        path.Append(paths[i]);
                    }
                    else
                    {
                        path.Append(directorySeparator);
                        path.Append(paths[i]);
                    }
                }
            }
            return path.ToString();
        }
    }
}