import pytest
from appengine import AEErrs, AppEngineException, is_number


class TestIsNumber:
    def test_integer_string(self):
        assert is_number("42") is True

    def test_float_string(self):
        assert is_number("3.14") is True

    def test_negative_string(self):
        assert is_number("-1.5") is True

    def test_non_numeric_string(self):
        assert is_number("hello") is False

    def test_empty_string(self):
        assert is_number("") is False


class TestAEErrs:
    def test_parse_error_value(self):
        assert AEErrs.PARSE_ERROR.value == -32700

    def test_invalid_request_value(self):
        assert AEErrs.INVALID_REQUEST.value == -32600

    def test_meth_not_found_value(self):
        assert AEErrs.METH_NOT_FOUND.value == -32601

    def test_invalid_params_value(self):
        assert AEErrs.INVALID_PARAMS.value == -32602

    def test_internal_error_value(self):
        assert AEErrs.INTERNAL_ERROR.value == -32000

    def test_str_parse_error(self):
        assert "Invalid JSON" in str(AEErrs.PARSE_ERROR)

    def test_str_invalid_request(self):
        assert "not a valid object" in str(AEErrs.INVALID_REQUEST)


class TestAppEngineException:
    def test_default_message(self):
        exc = AppEngineException(AEErrs.INTERNAL_ERROR)
        assert exc.value == AEErrs.INTERNAL_ERROR.value
        assert "Internal error" in exc.mesg

    def test_custom_message(self):
        exc = AppEngineException(AEErrs.INVALID_PARAMS, "bad param")
        assert exc.value == AEErrs.INVALID_PARAMS.value
        assert exc.mesg == "bad param"

    def test_inherits_exception(self):
        assert isinstance(AppEngineException(AEErrs.INTERNAL_ERROR), Exception)

    def test_raise_and_catch(self):
        with pytest.raises(AppEngineException) as exc_info:
            raise AppEngineException(AEErrs.METH_NOT_FOUND, "not found")
        assert exc_info.value.value == AEErrs.METH_NOT_FOUND.value