#!/usr/bin/env python3
"""Evaluate whether the latest archive candidate is promotable."""

from __future__ import annotations

import argparse
import json
from pathlib import Path

from .common import TRAINING_EVALS_DIR


def load_eval(path: Path) -> dict:
    return json.loads(path.read_text())


def main() -> None:
    parser = argparse.ArgumentParser(description="Evaluate archive candidate promotion gates")
    parser.add_argument("--eval-file", default="", help="Specific eval JSON file to inspect")
    args = parser.parse_args()

    if args.eval_file:
        eval_path = Path(args.eval_file).expanduser()
    else:
        eval_files = sorted(TRAINING_EVALS_DIR.glob("run_*.json"))
        if not eval_files:
            print(json.dumps({"pass": False, "reason": "missing eval file"}))
            return
        eval_path = eval_files[-1]

    payload = load_eval(eval_path)
    baseline = float(payload.get("baseline_composite", 0.0))
    candidate = float(payload.get("candidate_composite", 0.0))
    improvement = 0.0
    if baseline > 0:
        improvement = (candidate - baseline) / baseline

    refusal_regression = bool(payload.get("refusal_over_fabrication_regression", True))
    source_regression = bool(payload.get("source_distinction_regression", True))
    evidence_rate = float(payload.get("evidence_citation_rate", 0.0))

    gate_pass = (
        improvement >= 0.05
        and not refusal_regression
        and not source_regression
        and evidence_rate >= 0.95
    )

    print(
        json.dumps(
            {
                "pass": gate_pass,
                "eval_file": eval_path.name,
                "candidate_id": payload.get("candidate_id"),
                "baseline_composite": baseline,
                "candidate_composite": candidate,
                "improvement_pct": round(improvement * 100, 2),
                "evidence_citation_rate": evidence_rate,
                "refusal_over_fabrication_regression": refusal_regression,
                "source_distinction_regression": source_regression,
                "rollback_model": payload.get("rollback_model"),
            },
            sort_keys=True,
        )
    )


if __name__ == "__main__":
    main()