import os.path as op


def infer_filetype(filename):
    _, ext = op.splitext(filename)

    if ext.lower() == ".bw" or ext.lower() == ".bigwig":
        return "bigwig"
    elif ext.lower() == ".mcool" or ext.lower() == ".cool":
        return "cooler"
    elif ext.lower() == ".htime":
        return "time-interval-json"
    elif ext.lower() == ".hitile":
        return "hitile"

    return None


def infer_datatype(filetype):
    if filetype == "cooler":
        return "matrix"
    if filetype == "bigwig":
        return "vector"
    if filetype == "time-interval-json":
        return "time-interval"
    if filetype == "hitile":
        return "vector"