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"""A CLI to get pipeline definitions from pipeline modules."""
from __future__ import absolute_import

import argparse
import sys

from _utils import get_pipeline_driver


def main():  # pragma: no cover
    """The main harness that gets the pipeline definition JSON.

    Prints the json to stdout or saves to file.
    """
    parser = argparse.ArgumentParser("Gets the pipeline definition for the pipeline script.")

    parser.add_argument(
        "-n",
        "--module-name",
        dest="module_name",
        type=str,
        help="The module name of the pipeline to import.",
    )
    parser.add_argument(
        "-f",
        "--file-name",
        dest="file_name",
        type=str,
        default=None,
        help="The file to output the pipeline definition json to.",
    )
    parser.add_argument(
        "-kwargs",
        "--kwargs",
        dest="kwargs",
        default=None,
        help="Dict string of keyword arguments for the pipeline generation (if supported)",
    )
    args = parser.parse_args()

    if args.module_name is None:
        parser.print_help()
        sys.exit(2)

    try:
        pipeline = get_pipeline_driver(args.module_name, args.kwargs)
        content = pipeline.definition()
        if args.file_name:
            with open(args.file_name, "w") as f:
                f.write(content)
        else:
            print(content)
    except Exception as e:  # pylint: disable=W0703
        print(f"Exception: {e}")
        sys.exit(1)


if __name__ == "__main__":
    main()