from configuration import iers_download_url,iers_output_dir
import urllib.request
import os



download_filenames = [
    'finals.daily',
    'finals.daily.extended',
    'finals2000A.daily',
    'finals2000A.daily.extended'
]

os.makedirs(iers_output_dir, exist_ok=True)

for filename in download_filenames:
    url = os.path.join(iers_download_url, filename)

    final_path = os.path.join(iers_output_dir, filename)
    temp_path  = final_path + '.temp'

    try:
        # download to temporary file
        urllib.request.urlretrieve(url, temp_path)

        # atomically replace the old file
        os.replace(temp_path, final_path)

        print(f"Downloaded {filename}")

    except Exception as e:
        # clean up partial download
        if os.path.exists(temp_path):
            os.remove(temp_path)

        print(f"Failed to download {filename}: {e}")