import json, hashlib
from pathlib import Path


class DiskCache:
    def __init__(self, d=".cache"):
        self.d = Path(d)
        self.d.mkdir(parents=True, exist_ok=True)

    def _p(self, k):
        return self.d / f"{hashlib.sha256(k.encode()).hexdigest()}.json"

    def get(self, k):
        p = self._p(k)
        return json.loads(p.read_text()) if p.exists() else None

    def set(self, k, v):
        self._p(k).write_text(json.dumps(v))


class ReportStore:
    def __init__(self, base="./reports"):
        self.b = Path(base)

    def save_history(self, prog, status, matched, dur):
        t = self.b / "trends" / f"{prog}.jsonl"
        t.parent.mkdir(parents=True, exist_ok=True)
        import datetime
        t.write_text(json.dumps({"ts": datetime.datetime.now().isoformat(), "status": status,
                                  "fields_matched": matched, "duration_s": dur}) + "\n")