import contextlib

from exif import Image


def decimal_coords(coords: float, ref: str) -> float:
    """Get latitude/longitude from coord and direction reference

    ### Args:
        * coords (`float`): _description_
        * ref (`str`): _description_

    ### Returns:
        * float: Decimal degrees
    """
    decimal_degrees = coords[0] + coords[1] / 60 + coords[2] / 3600

    if ref in {"S", "W"}:
        decimal_degrees = -decimal_degrees

    return round(decimal_degrees, 5)


def extract_location(filepath: str) -> dict:
    """Get location data from image

    ### Args:
        * filepath (`str`): Path to file location

    ### Returns:
        * dict: `{ "lng": float, "lat": float, "alt": float }`
    """

    output = {"lng": 0.0, "lat": 0.0, "alt": 0.0}

    with open(filepath, "rb") as src:
        img = Image(src)

    if img.has_exif is False:
        return output

    with contextlib.suppress(AttributeError):
        output["lng"] = decimal_coords(img.gps_longitude, img.gps_longitude_ref)
        output["lat"] = decimal_coords(img.gps_latitude, img.gps_latitude_ref)
        output["alt"] = img.gps_altitude

    return output