"""validate_calibration_change_ledger_v1.py — CALIBRATION_CHANGE_LEDGER_V1 validator"""
from __future__ import annotations

import json
import sys
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
PATH = ROOT / "Temp" / "calibration_change_ledger_v4.json"


def main() -> int:
    if not PATH.exists():
        print("CALIBRATION_CHANGE_LEDGER_FAIL: missing Temp/calibration_change_ledger_v4.json")
        return 1
    try:
        data = json.loads(PATH.read_text(encoding="utf-8"))
    except Exception as exc:
        print(f"CALIBRATION_CHANGE_LEDGER_FAIL: invalid json ({exc})")
        return 1

    changes = data.get("changes") if isinstance(data.get("changes"), list) else []
    ledger_without_change_count = int(data.get("threshold_change_without_ledger_count") or 0)
    linked = data.get("linked_outcome_artifacts") if isinstance(data.get("linked_outcome_artifacts"), list) else []

    missing = []
    for idx, item in enumerate(changes):
        if not isinstance(item, dict):
            missing.append(f"changes[{idx}] not object")
            continue
        for key in ("threshold_id", "outcome_link", "registry_link"):
            if key not in item:
                missing.append(f"changes[{idx}] missing {key}")

    ok = bool(changes) and ledger_without_change_count == 0 and "Temp/outcome_ledger_v1.json" in linked and not missing
    if ok:
        print("CALIBRATION_CHANGE_LEDGER_OK")
        print(f"changes={len(changes)} linked_outcome_artifacts={len(linked)}")
        return 0

    print("CALIBRATION_CHANGE_LEDGER_FAIL")
    print(f"changes={len(changes)} threshold_change_without_ledger_count={ledger_without_change_count} linked={linked}")
    if missing:
        for item in missing[:10]:
            print(f"- {item}")
    return 1


if __name__ == "__main__":
    raise SystemExit(main())