from shutil import copyfile
import os
import time
import uuid

def is_done_being_written(file_path):
    file_size_before = os.path.getsize(file_path)
    print('Size before: ', file_size_before)
    time.sleep(1)  # 1s
    file_size_after = os.path.getsize(file_path)
    print('Size after: ', file_size_after)
    return file_size_before == file_size_after

def copy(source_file_path):
    destination_dir = '/target'
    destination_file_path = os.path.join(destination_dir, str(uuid.uuid4()) + '.pdf')
    print(source_file_path, ' -> ', destination_file_path)
    print('Checking if the file is done being written...')
    while not is_done_being_written(source_file_path):
        continue
    print('File is stable, copying...')
    copyfile(source_file_path, destination_file_path)
    print('Deleting original...')
    os.remove(source_file_path)
    
def main():
    while True:
        try:
            source_dir = '/source'
            for file_name in os.listdir(source_dir):
                file_path = os.path.join(source_dir, file_name)
                try:
                    copy(file_path)
                except Exception as err:
                    print('Failed to copy ', file_path)
                    print(err)
        except Exception as err:
            print(err)
        print('Done!')
        print('Sleeping for 10m...')
        time.sleep(60 * 10)  #10m

if __name__ == "__main__":
    main()