"""
generate_reproducibility.py
===========================
Generates a reproducibility manifest for GomParam-v1.
"""

import datetime
import hashlib
import json
import subprocess
import sys
from pathlib import Path

OUT_DIR = Path("/mnt/data/projects/GomParam-v1/results")
OUT_DIR.mkdir(parents=True, exist_ok=True)
DATA_DIR = Path("/mnt/data/projects/GomParam-v1/data")

def get_git_commit():
    try:
        return subprocess.check_output(["git", "rev-parse", "HEAD"]).decode("utf-8").strip()
    except Exception:
        return "unknown"

def get_package_versions():
    try:
        reqs = subprocess.check_output(["pip", "freeze"]).decode("utf-8").splitlines()
        packages = ["transformers", "torch", "datasets", "numpy", "scipy", "accelerate"]
        versions = {}
        for r in reqs:
            for p in packages:
                if r.startswith(f"{p}=="):
                    versions[p] = r.split("==")[1]
        return versions
    except Exception:
        return {}

def compute_dataset_hash():
    """Compute SHA256 of all JSON files combined."""
    hasher = hashlib.sha256()
    for f in sorted(DATA_DIR.glob("*.json")):
        with open(f, "rb") as bf:
            hasher.update(bf.read())
    return hasher.hexdigest()

manifest = {
    "dataset_name": "GomParam-v1",
    "dataset_version": "1.0",
    "dataset_sha256": compute_dataset_hash(),
    "hf_dataset_revision": "main",
    "evaluation_commit_hash": get_git_commit(),
    "python_version": sys.version.split()[0],
    "package_versions": get_package_versions(),
    "evaluation_timestamp": datetime.datetime.now(datetime.timezone.utc).isoformat(),
    "random_seeds": {
        "bootstrap": 42,
        "option_shuffle": 42
    }
}

out_file = OUT_DIR / "reproducibility.json"
with open(out_file, "w") as f:
    json.dump(manifest, f, indent=2)

print(f"Reproducibility manifest generated: {out_file}")