import argparse

try:
    # importlib.metadata is present in Python 3.8 and later
    import importlib.metadata as importlib_metadata
except ImportError:
    # use the shim package importlib-metadata pre-3.8
    import importlib_metadata as importlib_metadata

try:
    __version__ = importlib_metadata.version(__package__ or __name__)
    #  __summary__ = importlib_metadata.metadata(__package__ or __name__)['summary']
    __summary__ = (
        "Bundle assets of distributed HTML docs into one self-contained HTML file"
    )
except importlib_metadata.PackageNotFoundError:
    __version__ = "??"
    __summary__ = "??"


parser = argparse.ArgumentParser(
    description=__summary__,
)

parser.add_argument(
    "-v",
    "--version",
    action="version",
    version=__version__,
)

parser.add_argument(
    "-R",
    "--revert",
    default=False,
    action="store_true",
    help="set this flag for the reverse operation: deflate a Zundler file"
    ' into its components (ouput_path must be a directory; "." by default)',
)

parser.add_argument(
    "-P",
    "--append-pre",
    default="",
    help="append JS code to inject_pre script (default: %(default)s)",
)


parser.add_argument(
    "-p",
    "--append-post",
    default="",
    help="append JS code to inject_post script (default: %(default)s)",
)


parser.add_argument(
    "input_path",
    help="input path to the root HTML file",
)

parser.add_argument(
    "-o",
    "--output-path",
    help="output path to resulting HTML file",
)


def parse_args(argv=None):
    args = parser.parse_args(argv)

    return args