"""Shared reproducibility helpers for the Swift 1.5 build."""
import hashlib
import json
import os
import time
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
RUN = Path(os.environ.get("SWIFT15_RUN_DIR", ROOT / "runs/swift15")).resolve()
SOURCE = ROOT / "models/Swift-1.5-Qwen3.8-27B-AWQ-source"
BASELINE = ROOT / "models/Swift-1.5-Qwen3.8-27B-W4A16-HyperQwen"
FAST = Path(os.environ.get("SWIFT15_FAST_MODEL", ROOT / "models/Swift-1.5-Qwen3.8-27B-W4A16-HyperQwen-fast")).resolve()


def read_json(path):
    return json.loads(Path(path).read_text())


def write_json(path, value):
    path = Path(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    temporary = path.with_name(path.name + ".tmp")
    temporary.write_text(json.dumps(value, indent=2, ensure_ascii=False) + "\n")
    os.replace(temporary, path)


def sha256(path):
    h = hashlib.sha256()
    with open(path, "rb") as f:
        for chunk in iter(lambda: f.read(8 << 20), b""):
            h.update(chunk)
    return h.hexdigest()


def records(path):
    with open(path) as f:
        return [json.loads(line) for line in f if line.strip()]


def write_records(path, rows):
    path = Path(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w") as f:
        for row in rows:
            f.write(json.dumps(row, ensure_ascii=False) + "\n")


def stamp():
    return time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())