#!/usr/bin/env python
"""Utilities for running tests."""

import os
import urllib.request

CACHE_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), "test_data")


def get_cached_level_00(num_files=2):
    """Get a couple real ASCII files to test against."""
    file_urls = (
        "https://metobs-test.ssec.wisc.edu/pub/cache/aoss/tower/level_00/version_00/2020/01/01/aoss_tower.2020-01-01.ascii",
        "https://metobs-test.ssec.wisc.edu/pub/cache/aoss/tower/level_00/version_00/2020/01/02/aoss_tower.2020-01-02.ascii",
    )
    if num_files > len(file_urls):
        raise ValueError(f"Maximum of {len(file_urls)} can be loaded.")
    file_urls = file_urls[:num_files]

    for u in file_urls:
        fn = os.path.join(CACHE_DIR, os.path.basename(u))
        if not os.path.isfile(fn):
            urllib.request.urlretrieve(u, fn)
        yield fn