"""benchmark 입력(brief·rubric·fixtures·evidence-pack) sha256 — controller 주입 감사·재현용."""
import hashlib
import os


def sha256_file(path):
    h = hashlib.sha256()
    with open(path, "rb") as f:
        for chunk in iter(lambda: f.read(65536), b""):
            h.update(chunk)
    return h.hexdigest()


def sha256_tree(root):
    """디렉토리 정규화 hash: (상대경로, 파일hash) 를 경로 정렬해 연쇄."""
    h = hashlib.sha256()
    for rel in sorted(os.path.relpath(os.path.join(dp, fn), root)
                      for dp, _, fns in os.walk(root) for fn in fns):
        h.update(rel.encode())
        h.update(sha256_file(os.path.join(root, rel)).encode())
    return h.hexdigest()


def benchmark_input(brief, rubric, fixtures_dir, evidence_pack_dir):
    return {
        "brief-sha256": sha256_file(brief),
        "rubric-sha256": sha256_file(rubric),
        "fixture-set-sha256": sha256_tree(fixtures_dir),
        "evidence-pack-sha256": sha256_tree(evidence_pack_dir),
    }