import sys
import hashlib
import click

def _decode(string, encoding=sys.getfilesystemencoding()):
    """Return a utf8 encoded unicode string.
    Python2 and Python3 differ in how they handle strings.
    So we do a few checks to see if the string is ascii or unicode.
    Then we decode it if needed.
    """
    if hasattr(string, 'decode'):
        # If the string is already unicode we return it.
        try:
            if isinstance(string, unicode):
                return string
        except NameError:
            pass

        return string.decode(encoding)

    return string


def checksum(file_path, blocksize=65536):
    """Create a hash value for the given file.
    See http://stackoverflow.com/a/3431835/1318758.
    :param str file_path: Path to the file to create a hash for.
    :param int blocksize: Read blocks of this size from the file when
        creating the hash.
    :returns: str or None
    """
    hasher = hashlib.sha256()
    with open(file_path, 'rb') as file:
        buf = file.read(blocksize)

        while len(buf) > 0:
            hasher.update(buf)
            buf = file.read(blocksize)
        return hasher.hexdigest()
    return None

@click.command('import')
@click.option('--file', type=click.Path(dir_okay=False),
              help='Import this file, if specified.')
def _import(file):
    print(file)
    _file = _decode(file)
    print(_file)
    print(checksum(file))
    print(checksum(_file))

@click.group()
def main():
    print("pass")


main.add_command(_import)



if __name__ == '__main__':
    main()