import warnings
from io import BytesIO

from easy_thumbnails import utils


def pil_image(source, exif_orientation=True, **options):
    """
    Try to open the source file directly using PIL, ignoring any errors.

    exif_orientation

        If EXIF orientation data is present, perform any required reorientation
        before passing the data along the processing pipeline.

    """
    # Use a BytesIO wrapper because if the source is an incomplete file like
    # object, PIL may have problems with it. For example, some image types
    # require tell and seek methods that are not present on all storage
    # File objects.
    from PIL import Image, ImageFile

    if not source:
        return
    source = BytesIO(source.read())

    image = Image.open(source)
    # Fully load the image now to catch any problems with the image contents.
    try:
        ImageFile.LOAD_TRUNCATED_IMAGES = True
        image.load()
    finally:
        ImageFile.LOAD_TRUNCATED_IMAGES = False

    if exif_orientation:
        image = utils.exif_orientation(image)
    return image


def vil_image(source, **options):
    """
    Try to open the source file directly using VIL, ignoring any errors.
    """
    try:
        from easy_thumbnails.VIL import Image
    except ImportError as ie:
        warnings.warn(f"Could not import VIL for SVG image support: {ie}.")
        return

    if not source:
        return
    # path method should not be implemented for remote storages. We can pass the file directly.
    # filename = source.source_storage.path(source.file.name)
    try:
        return Image.load(source.file)
    except Exception as exc:
        raise exc