# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import io
import re
from typing import Optional

from PIL import Image

Image.MAX_IMAGE_PIXELS = 933120000
_IMG_EXTENSIONS = "jpg jpeg png ppm pgm pbm pnm".split()


def pil_loader(key: str, data: bytes) -> Optional[Image.Image]:
    r"""
    Function to load an image.
    If the image is corrupt, it returns a black image.
    Args:
        key (str): Image key.
        data (bytes): Image data stream.
    Returns:
        PIL image
    """
    extension = re.sub(r".*[.]", "", key)
    if extension.lower() not in _IMG_EXTENSIONS:
        return None

    with io.BytesIO(data) as stream:
        img = Image.open(stream)
        img.load()
        img = img.convert("RGB")

    return img
