"""Tests for ML exception classes."""

import pytest

from lilith_ml_exceptions.errors import (
    InferenceError,
    MLBaseError,
    ModelLoadError,
    ResourceError,
    ValidationError,
)
from lilith_ml_exceptions.http_mappers import (
    exception_to_http_status,
    exception_to_response,
)


class TestMLBaseError:
    """Tests for MLBaseError base class."""

    def test_basic_creation(self):
        """Test creating a basic exception."""
        exc = MLBaseError("Something went wrong")
        assert str(exc) == "Something went wrong"
        assert exc.message == "Something went wrong"
        assert exc.details == {}
        assert exc.cause is None

    def test_with_details(self):
        """Test exception with details."""
        exc = MLBaseError("Error", details={"key": "value"})
        assert exc.details == {"key": "value"}

    def test_with_cause(self):
        """Test exception with underlying cause."""
        cause = ValueError("Original error")
        exc = MLBaseError("Wrapped error", cause=cause)
        assert exc.cause is cause

    def test_to_dict(self):
        """Test converting exception to dictionary."""
        exc = MLBaseError("Error message", details={"foo": "bar"})
        result = exc.to_dict()

        assert result["error_code"] == "ML_ERROR"
        assert result["message"] == "Error message"
        assert result["details"] == {"foo": "bar"}


class TestModelLoadError:
    """Tests for ModelLoadError."""

    def test_error_code(self):
        """Test that error code is correct."""
        exc = ModelLoadError("Model not found")
        assert exc.error_code == "MODEL_LOAD_ERROR"

    def test_with_model_path(self):
        """Test exception with model path."""
        exc = ModelLoadError("Not found", model_path="/models/bert.pt")
        assert exc.model_path == "/models/bert.pt"
        assert exc.details["model_path"] == "/models/bert.pt"

    def test_with_model_name(self):
        """Test exception with model name."""
        exc = ModelLoadError("Failed", model_name="bert-base")
        assert exc.model_name == "bert-base"
        assert exc.details["model_name"] == "bert-base"

    def test_http_status(self):
        """Test HTTP status code mapping."""
        exc = ModelLoadError("Error")
        assert exception_to_http_status(exc) == 503


class TestInferenceError:
    """Tests for InferenceError."""

    def test_error_code(self):
        """Test that error code is correct."""
        exc = InferenceError("Inference failed")
        assert exc.error_code == "INFERENCE_ERROR"

    def test_with_input_shape(self):
        """Test exception with input shape."""
        exc = InferenceError("OOM", input_shape=(1, 3, 224, 224))
        assert exc.input_shape == (1, 3, 224, 224)
        assert exc.details["input_shape"] == (1, 3, 224, 224)

    def test_with_timeout(self):
        """Test exception with timeout."""
        exc = InferenceError("Timeout", timeout_seconds=30.0)
        assert exc.timeout_seconds == 30.0
        assert exc.details["timeout_seconds"] == 30.0

    def test_http_status(self):
        """Test HTTP status code mapping."""
        exc = InferenceError("Error")
        assert exception_to_http_status(exc) == 500


class TestValidationError:
    """Tests for ValidationError."""

    def test_error_code(self):
        """Test that error code is correct."""
        exc = ValidationError("Invalid input")
        assert exc.error_code == "VALIDATION_ERROR"

    def test_with_field(self):
        """Test exception with field name."""
        exc = ValidationError("Invalid", field="image")
        assert exc.field == "image"
        assert exc.details["field"] == "image"

    def test_with_expected_type(self):
        """Test exception with expected type."""
        exc = ValidationError("Wrong type", expected_type="numpy.ndarray")
        assert exc.expected_type == "numpy.ndarray"

    def test_with_constraints(self):
        """Test exception with constraints."""
        constraints = {"min_size": 224, "max_size": 1024}
        exc = ValidationError("Out of range", constraints=constraints)
        assert exc.constraints == constraints

    def test_http_status(self):
        """Test HTTP status code mapping."""
        exc = ValidationError("Error")
        assert exception_to_http_status(exc) == 400


class TestResourceError:
    """Tests for ResourceError."""

    def test_error_code(self):
        """Test that error code is correct."""
        exc = ResourceError("GPU not available")
        assert exc.error_code == "RESOURCE_ERROR"

    def test_with_resource_info(self):
        """Test exception with resource information."""
        exc = ResourceError(
            "Insufficient VRAM",
            resource_type="VRAM",
            required_amount="8GB",
            available_amount="4GB",
        )
        assert exc.resource_type == "VRAM"
        assert exc.required_amount == "8GB"
        assert exc.available_amount == "4GB"

    def test_http_status(self):
        """Test HTTP status code mapping."""
        exc = ResourceError("Error")
        assert exception_to_http_status(exc) == 503


class TestExceptionToResponse:
    """Tests for exception_to_response function."""

    def test_ml_exception_response(self):
        """Test response for ML exceptions."""
        exc = ModelLoadError("Not found", model_name="bert")
        response = exception_to_response(exc)

        assert response["status"] == "error"
        assert response["error"]["error_code"] == "MODEL_LOAD_ERROR"
        assert response["error"]["message"] == "Not found"
        assert response["error"]["details"]["model_name"] == "bert"

    def test_generic_exception_response(self):
        """Test response for non-ML exceptions."""
        exc = ValueError("Something went wrong")
        response = exception_to_response(exc)

        assert response["status"] == "error"
        assert response["error"]["error_code"] == "INTERNAL_ERROR"
        assert response["error"]["message"] == "Something went wrong"


class TestUnknownExceptionStatus:
    """Tests for unknown exception handling."""

    def test_unknown_exception_returns_500(self):
        """Test that unknown exceptions map to 500."""
        exc = RuntimeError("Unknown error")
        assert exception_to_http_status(exc) == 500