import os
import glob
import shutil


def rearrange_dir_structure(dataset_path, traintest='train'):
    '''move files to follow the directory structure as REDS

    Original GoPro dataset is organized as GoPro/train/GOPR0854_11_00-000022.png
    We move files and organize them as GoPro/train_GT/GOPR0854_11_00/000022.jpg (similar to REDS).

    :param dataset_path: dataset path
    :return: None
    '''
    os.makedirs(os.path.join(dataset_path, f'{traintest}_GT'), exist_ok=True)
    os.makedirs(os.path.join(dataset_path, f'{traintest}_GT_blurred'), exist_ok=True)

    file_list = sorted(glob.glob(os.path.join(f'{dataset_path}/{traintest}', '*')))
    for path in file_list:
        name = os.path.basename(path)
        print(name)

        shutil.move(os.path.join(path, 'sharp'), os.path.join(f'{dataset_path}/{traintest}_GT', name))
        shutil.move(os.path.join(path, 'blur'), os.path.join(f'{dataset_path}/{traintest}_GT_blurred', name))

    shutil.rmtree(os.path.join(dataset_path, traintest))


def generate_meta_info_txt(data_path, meta_info_path):
    '''generate meta_info_GoPro_GT.txt for GoPro

    :param data_path: dataset path.
    :return: None
    '''
    f= open(meta_info_path, "w+")
    file_list = sorted(glob.glob(os.path.join(data_path, 'train_GT/*')))
    total_frames = 0
    for path in file_list:
        name = os.path.basename(path)
        frames = sorted(glob.glob(os.path.join(path, '*')))
        start_frame = os.path.basename(frames[0]).split('.')[0]

        print(name, len(frames), start_frame)
        total_frames += len(frames)

        f.write(f"{name} {len(frames)} (720,1280,3) {start_frame}\r\n")

    assert total_frames == 2103, f'GoPro training set should have 2103 images, but got {total_frames} images'

if __name__ == '__main__':

    dataset_path = 'trainsets/GoPro'

    rearrange_dir_structure(dataset_path, 'train')
    rearrange_dir_structure(dataset_path, 'test')
    generate_meta_info_txt(dataset_path, 'data/meta_info/meta_info_GoPro_GT.txt')