from hashlib import sha256
from pathlib import Path
from typing import Any, Dict
from unittest.mock import MagicMock, patch

from great_ai.large_file import LargeFileS3


def test_recreated_remote_version_invalidates_other_clients(tmp_path: Path) -> None:
    remote: Dict[str, bytes] = {}
    backend = MagicMock()
    backend.list_objects_v2.side_effect = lambda **kwargs: {
        "Contents": [
            {"Key": key, "ETag": sha256(value).hexdigest()}
            for key, value in remote.items()
        ]
    }
    backend.delete_object.side_effect = lambda **kwargs: remote.pop(kwargs["Key"])

    def upload(self: LargeFileS3, path: Path, hide_progress: bool) -> None:
        remote[f"{self._name}/{self.version}"] = path.read_bytes()

    def download(
        self: LargeFileS3, remote_path: Any, path: Path, hide_progress: bool
    ) -> None:
        path.write_bytes(remote[remote_path])

    with (
        patch.object(LargeFileS3, "_client", backend),
        patch.object(LargeFileS3, "_upload", upload),
        patch.object(LargeFileS3, "_download", download),
        patch.object(LargeFileS3, "max_cache_size", None),
    ):
        with patch.object(LargeFileS3, "cache_path", tmp_path / "writer"):
            with LargeFileS3("model", "w") as file:
                file.write("old")
        with patch.object(LargeFileS3, "cache_path", tmp_path / "reader"):
            reader = LargeFileS3("model")
            assert reader.get().read_text() == "old"
        with patch.object(LargeFileS3, "cache_path", tmp_path / "writer"):
            LargeFileS3("model").delete()
            with LargeFileS3("model", "w") as file:
                file.write("new")
            assert LargeFileS3("model").get().read_text() == "new"
        with patch.object(LargeFileS3, "cache_path", tmp_path / "reader"):
            assert reader.get().read_text() == "new"