"""nova decommission — transform a resolved stack for decommission (REQ-92)."""

from __future__ import annotations

import json

from core.decommission_transform import decommission_transform


def add_parser(subparsers):
    p = subparsers.add_parser("decommission", help="transform a stack JSON for decommission")
    p.add_argument("stack_json", help="path to a resolved stack JSON")
    p.add_argument("--out", default=None, help="output path (default: stdout)")
    p.set_defaults(_run=run)


def run(args) -> int:
    with open(args.stack_json) as fh:
        stack = json.load(fh)
    out = decommission_transform(stack)
    blob = json.dumps(out, indent=2)
    print(blob)
    return 0


if __name__ == "__main__":
    import sys
    print("use: nova decommission <stack.json>", file=sys.stderr)