if 'APPDATA' in os.environ:
    ## Windows
    tile_dir = os.path.join(os.environ['APPDATA'], "pyzui", "tilestore")
else:
    ## Unix
    tile_dir = os.path.join(os.path.expanduser('~'), ".pyzui", "tilestore")

def get_media_path(media_id):
    media_hash = sha.new(media_id).hexdigest()
    media_dir = os.path.join(tile_dir, media_hash)
    return media_dir

def get_tile_path(tile_id, mkdirp=False, prefix=None, filext=None):
    media_id, tilelevel, row, col = tile_id

    if not prefix:
        prefix = get_media_path(media_id)

    if filext is None:
        filext = get_metadata(media_id, 'filext')

    filename = os.path.join(prefix, "%02d" % tilelevel, "%06d" % row)

    if mkdirp and not os.path.exists(filename):
        ## create parent directories
        os.makedirs(filename)

    filename = os.path.join(
        filename, "%02d_%06d_%06d.%s" % (tilelevel, row, col, filext))

    return filename