from unittest import TestCase
from unittest.mock import Mock, call

from samtranslator.model.exceptions import InvalidDocumentException
from samtranslator.parser.parser import Parser
from samtranslator.plugins import LifeCycleEvents


class TestParser(TestCase):
    def test_parse(self):
        parser = Parser()
        parser._validate = Mock()
        sam_plugins_mock = Mock()
        sam_plugins_mock.act = Mock()
        sam_template = {}
        parameter_values = {}

        parser.parse(sam_template, parameter_values, sam_plugins_mock)
        parser._validate.assert_has_calls([call(sam_template, parameter_values)])
        sam_plugins_mock.act.assert_has_calls([call(LifeCycleEvents.before_transform_template, sam_template)])

    def test_validate_parameter_values_is_required(self):
        parser = Parser()
        with self.assertRaises(ValueError):
            parser._validate({}, None)

    def test_validate_template_with_no_resource(self):
        parser = Parser()
        with self.assertRaises(InvalidDocumentException):
            parser._validate({}, {})

    def test_validate_template_with_non_dict_resources(self):
        parser = Parser()
        with self.assertRaises(InvalidDocumentException):
            parser._validate({"Resources": "string"}, {})

    def test_validate_template_with_empty_resources(self):
        parser = Parser()
        with self.assertRaises(InvalidDocumentException):
            parser._validate({"Resources": {}}, {})