import warnings
import pandas
try:
    from etk.wikidata.utils import parse_datetime_string
    has_etk = True
except (ImportError, OSError):
    has_etk = False

VALID_PROPERTY_TYPES=["globecoordinate", "quantity", "time", "string", "monolingualtext",
                        "externalidentifier", "wikibaseitem", "wikibaseproperty", "url"]


def translate_precision_to_integer(precision: str) -> int:
    """
    This function translates the precision value to indexes used by wikidata
    :param precision:
    :return:
    """
    if isinstance(precision, int):
        return precision
    precision_map = {
        "gigayear": 0,
        "gigayears": 0,
        "100 megayears": 1,
        "100 megayear": 1,
        "10 megayears": 2,
        "10 megayear": 2,
        "megayears": 3,
        "megayear": 3,
        "100 kiloyears": 4,
        "100 kiloyear": 4,
        "10 kiloyears": 5,
        "10 kiloyear": 5,
        "millennium": 6,
        "century": 7,
        "10 years": 8,
        "10 year": 8,
        "years": 9,
        "year": 9,
        "months": 10,
        "month": 10,
        "days": 11,
        "day": 11,
        "hours": 12,
        "hour": 12,
        "minutes": 13,
        "minute": 13,
        "seconds": 14,
        "second": 14
    }
    return precision_map[precision.lower()]



def parse_datetime(value, additional_formats=[], precisions=[]):
    # check if additional formats is a string and convert to single entry array:
    if isinstance(additional_formats, str):
        additional_formats = [additional_formats]
    
    precision=None
    if precisions and isinstance(precisions, str):
        precision=translate_precision_to_integer(precisions)
    
    value = str(value)
    for index, date_format in enumerate(additional_formats):
        try:
            datetime_string = pandas.to_datetime(value, format=date_format)

            if not precision:
                try:
                    precision=translate_precision_to_integer(precisions[index])
                except IndexError: #no precision defined for that format
                    precision=None
            return datetime_string.isoformat(), precision
        except ValueError as e:
            pass
        except Exception as e:
            pass
    try:
        datetime_string = pandas.to_datetime(value, infer_datetime_format=True)
        return datetime_string.isoformat(), precision
    except Exception as e:
        pass

    if has_etk:
        # use this line to make etk stop harassing us with "no lang features detected" warnings
        with warnings.catch_warnings(record=True) as w:
            datetime_string, precision = parse_datetime_string(
                value,
                additional_formats=additional_formats,
                prefer_language_date_order=False
            )
        if not precision: #only if user didn't hard-define a precision do we take from etk
            precision=int(precision.value.__str__())
        return datetime_string, precision
    raise ValueError('No date / datetime detected')