# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# 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 os


def get_files(root_path):
    res = []
    for root, dirs, files in os.walk(root_path, followlinks=True):
        for f in files:
            if f.endswith(('.jpg', '.png', '.jpeg', 'JPG')):
                res.append(os.path.join(root, f))
    return res


def get_image_list(image_path):
    """Get image list"""
    valid_suffix = [
        '.JPEG', '.jpeg', '.JPG', '.jpg', '.BMP', '.bmp', '.PNG', '.png'
    ]
    image_list = []
    image_dir = None
    if os.path.isfile(image_path):
        if os.path.splitext(image_path)[-1] in valid_suffix:
            image_list.append(image_path)
        else:
            image_dir = os.path.dirname(image_path)
            with open(image_path, 'r') as f:
                for line in f:
                    line = line.strip()
                    if len(line.split()) > 1:
                        raise RuntimeError(
                            'There should be only one image path per line in `image_path` file. Wrong line: {}'
                            .format(line))
                    image_list.append(os.path.join(image_dir, line))
    elif os.path.isdir(image_path):
        image_dir = image_path
        for root, dirs, files in os.walk(image_path):
            for f in files:
                if '.ipynb_checkpoints' in root:
                    continue
                if os.path.splitext(f)[-1] in valid_suffix:
                    image_list.append(os.path.join(root, f))
        image_list.sort()
    else:
        raise FileNotFoundError(
            '`image_path` is not found. it should be an image file or a directory including images'
        )

    if len(image_list) == 0:
        raise RuntimeError('There are not image file in `image_path`')

    return image_list, image_dir


def mkdir(path):
    sub_dir = os.path.dirname(path)
    if not os.path.exists(sub_dir):
        os.makedirs(sub_dir)