from __future__ import annotations

import hashlib
from pathlib import Path


class ObjectStore:
    def __init__(self, root: Path):
        self.root = root
        self.root.mkdir(parents=True, exist_ok=True)

    def put_bytes(self, data: bytes, suffix: str = "") -> tuple[str, str]:
        digest = hashlib.sha256(data).hexdigest()
        key = f"{digest[:2]}/{digest}{suffix}"
        path = self.root / key
        path.parent.mkdir(parents=True, exist_ok=True)
        if not path.exists():
            path.write_bytes(data)
        return f"local://{key}", digest

    def get_bytes(self, uri: str) -> bytes:
        if not uri.startswith("local://"):
            raise ValueError(f"Unsupported object URI: {uri}")
        return (self.root / uri.removeprefix("local://")).read_bytes()

    def path_for(self, uri: str) -> Path:
        if not uri.startswith("local://"):
            raise ValueError(f"Unsupported object URI: {uri}")
        return self.root / uri.removeprefix("local://")