"""Regression: durable session-state isolation survives env clears (#590)."""

from __future__ import annotations

import os
from pathlib import Path
from unittest.mock import patch

import mcp_session_state


def test_default_state_dir_survives_env_clear():
    """conftest pins default_state_dir so clear=True cannot hit host cache."""
    isolated = os.environ.get("GITEA_MCP_SESSION_STATE_DIR")
    assert isolated, "conftest must set GITEA_MCP_SESSION_STATE_DIR"
    host_cache = Path.home() / ".cache" / "gitea-tools" / "session-state"
    with patch.dict(os.environ, {}, clear=True):
        assert os.environ.get("GITEA_MCP_SESSION_STATE_DIR") is None
        resolved = mcp_session_state.default_state_dir()
        assert resolved == isolated
        assert Path(resolved).resolve() != host_cache.resolve()


def test_decision_lock_save_load_stays_in_isolated_dir():
    """Review-mutation ledger files land only under the per-test state dir."""
    isolated = os.environ.get("GITEA_MCP_SESSION_STATE_DIR")
    assert isolated
    with patch.dict(os.environ, {}, clear=True):
        saved = mcp_session_state.save_state(
            kind=mcp_session_state.KIND_DECISION_LOCK,
            profile_identity="gitea-default",
            payload={
                "live_mutations": [
                    {"pr_number": 1, "action": "request_changes"}
                ],
            },
        )
        assert saved is not None
        path = mcp_session_state.state_file_path(
            kind=mcp_session_state.KIND_DECISION_LOCK,
            profile_identity="gitea-default",
        )
        assert path.startswith(isolated + os.sep) or path.startswith(
            isolated + "/"
        )
        loaded = mcp_session_state.load_state(
            kind=mcp_session_state.KIND_DECISION_LOCK,
            profile_identity="gitea-default",
        )
        assert loaded is not None
        assert loaded.get("live_mutations")
        host_path = (
            Path.home()
            / ".cache"
            / "gitea-tools"
            / "session-state"
            / "review_decision_lock-gitea-default.json"
        )
        # Host file may exist from operator use; this write must not refresh it.
        # Prove our isolated file is distinct and present.
        assert Path(path).is_file()
        assert Path(path).resolve() != host_path.resolve()