"""nova regression — run the regression gate and write the report (REQ-177)."""

from __future__ import annotations

import sys

from core import env as _envhelper
from core.regression_verify import run_regression, write_report


def add_parser(subparsers):
    p = subparsers.add_parser("regression", help="run the regression gate + write report")
    p.add_argument("--milestone", default=None)
    p.add_argument("--phase", type=int, default=None)
    p.set_defaults(_run=run)


def run(args) -> int:
    milestone = args.milestone or _envhelper.get_env("REGRESSION_MILESTONE", "v1.10") or "v1.10"
    phase = args.phase if args.phase is not None else int(_envhelper.get_env("REGRESSION_PHASE", "52") or "52")
    report = run_regression(milestone=milestone, phase=phase)
    md, js = write_report(report)
    print(f"regression: {report.summary} -> {md}")
    return 0 if report.passed else 1


if __name__ == "__main__":
    import sys
    print("use: nova regression [--milestone v1.x] [--phase N]", file=sys.stderr)