"""dist 결정성 스냅샷 — sha256 파일 지도를 만들고 두 빌드를 비교한다.

사용: python -X utf8 dist-snap.py snap1 | python -X utf8 dist-snap.py compare dist-snap1.json
"""
import hashlib
import json
import os
import sys


def snap(root: str) -> dict:
    out = {}
    for dp, _, fns in os.walk(root):
        for fn in fns:
            p = os.path.join(dp, fn)
            rel = os.path.relpath(p, root).replace(os.sep, "/")
            with open(p, "rb") as fh:
                out[rel] = hashlib.sha256(fh.read()).hexdigest()
    return out


if sys.argv[1] == "snap":
    s = snap("dist")
    name = sys.argv[2]
    with open(name, "w", encoding="utf-8") as fh:
        json.dump(s, fh)
    print("files:", len(s))
elif sys.argv[1] == "compare":
    with open(sys.argv[2], encoding="utf-8") as fh:
        s1 = json.load(fh)
    s2 = snap("dist")
    only1 = sorted(set(s1) - set(s2))
    only2 = sorted(set(s2) - set(s1))
    diff = sorted(k for k in set(s1) & set(s2) if s1[k] != s2[k])
    print("build1 files:", len(s1), "build2 files:", len(s2))
    print("only_in_build1:", only1[:10])
    print("only_in_build2:", only2[:10])
    print("content_diff:", diff[:10])
    print("DETERMINISTIC" if not (only1 or only2 or diff) else "NON_DETERMINISTIC")