"""Unit tests for the Lambda handler."""

from unittest.mock import patch

import pytest
from src import app


def test_handler_returns_normalized_result_and_s3_url(
    mock_event: dict, mock_llm_response: dict
) -> None:
    """Handler loads response from S3, evaluates it, and stores the result."""
    with (
        patch("src.app.load_from_s3", return_value=mock_llm_response),
        patch(
            "src.app.store_result", return_value="s3://bucket/a/b/c/d/x.json"
        ) as mock_store,
    ):
        result = app.handler(mock_event, None)

    assert result["result_s3_url"] == "s3://bucket/a/b/c/d/x.json"
    payload = result["result"]
    assert payload["validationStatus"] == "FAIL"
    assert payload["releaseId"] == 4537582
    assert payload["summary"]["failures"] == 1
    assert payload["summary"]["warnings"] == 1
    assert payload["summary"]["passed"] == 6
    mock_store.assert_called_once_with("73558/95989/4537582/20585", payload)


def test_handler_raises_on_missing_output_s3_path() -> None:
    """Handler raises ValueError when output_s3_path is absent."""
    event = {"data": {"llm_response": {"failures": [], "warnings": []}}}
    with pytest.raises(ValueError, match="output_s3_path"):
        app.handler(event, None)


def test_handler_raises_on_missing_llm_response_s3_path() -> None:
    """Handler raises ValueError when llm_response_s3_path is absent."""
    event = {"data": {"output_s3_path": "a/b/c/d"}}
    with pytest.raises(ValueError, match="llm_response_s3_path"):
        app.handler(event, None)


def test_handler_raises_on_none_event() -> None:
    """Handler raises ValueError when event is None."""
    with pytest.raises(ValueError, match="output_s3_path"):
        app.handler(None, None)


def test_handler_reraises_storage_exceptions(
    mock_event: dict, mock_llm_response: dict
) -> None:
    """Storage failures bubble up to the caller."""
    with (
        patch("src.app.load_from_s3", return_value=mock_llm_response),
        patch("src.app.store_result", side_effect=RuntimeError("boom")),
    ):
        with pytest.raises(RuntimeError, match="boom"):
            app.handler(mock_event, None)