from __future__ import annotations

import json
from pathlib import Path


class SentOffersStore:
    def __init__(self, file_path: Path) -> None:
        self._file_path = file_path
        self._file_path.parent.mkdir(parents=True, exist_ok=True)
        self._sent_keys = self._load()

    def has(self, key: str) -> bool:
        return key in self._sent_keys

    def add(self, key: str) -> None:
        self._sent_keys.add(key)
        self._persist()

    def _load(self) -> set[str]:
        if not self._file_path.exists():
            return set()

        with self._file_path.open("r", encoding="utf-8") as file:
            data = json.load(file)

        return set(data)

    def _persist(self) -> None:
        with self._file_path.open("w", encoding="utf-8") as file:
            json.dump(sorted(self._sent_keys), file, ensure_ascii=False, indent=2)