from pathlib import Path
import pandas as pd

# SPICE data tree path, to be changed to your SPICE data mirror
data_path = "/archive/SOLAR-ORBITER/SPICE"      # example for IAS computing servers


def date_parser(string):
    try:
        return pd.Timestamp(string)
    except ValueError:
         return pd.NaT


def read_uio_cat():
    """
    Read UiO text table SPICE FITS files catalog
    http://astro-sdc-db.uio.no/vol/spice/fits/spice_catalog.txt

    Return
    ------
    pandas.DataFrame
        Table
    """
    cat_file = Path(data_path) / "fits" / "spice_catalog.txt"
    if not cat_file.exists():
        print(f'Error: Catalog file not available at {cat_file.as_posix()}')
        sys.exit(1)
    columns = list(pd.read_csv(cat_file, nrows=0).keys())
    date_columns = ['DATE-BEG','DATE', 'TIMAQUTC']
    df = pd.read_table(cat_file, skiprows=1, names=columns,
                    parse_dates=date_columns, date_parser=date_parser,
                    low_memory=False)
    return df