"""Tests for structured session logging."""

from __future__ import annotations

import json

from tai.session_log import SessionLogger


def test_session_logger_writes_jsonl_row(tmp_path) -> None:  # type: ignore[no-untyped-def]
    log_path = tmp_path / "logs" / "session.jsonl"
    logger = SessionLogger.create(str(log_path))

    logger.log_event("analysis_response", {"response": "Root cause is X"})

    lines = log_path.read_text(encoding="utf-8").splitlines()
    assert len(lines) == 1

    row = json.loads(lines[0])
    assert row["event"] == "analysis_response"
    assert row["payload"]["response"] == "Root cause is X"
    assert "ts" in row