from unittest import TestCase

from samtranslator.sdk.template import SamTemplate
from samtranslator.sdk.resource import SamResource

class TestSamTemplate(TestCase):

    def setUp(self):

        self.template_dict = {
          "Properties": {
              "c": "d"
          },
          "Metadata": {
              "a": "b"
          },
          "Resources": {
             "Function1": {
                "Type": "AWS::Serverless::Function",
                 "DependsOn": "SomeOtherResource"
             },
             "Function2": {
                "Type": "AWS::Serverless::Function",
                 "a": "b"
             },
             "Api": {
                "Type": "AWS::Serverless::Api"
             },
             "NonSam": {
                "Type": "AWS::Lambda::Function"
             }
          }
        }

    def test_iterate_must_yield_sam_resources_only(self):
        template = SamTemplate(self.template_dict)

        expected = [
            ("Function1", {"Type": "AWS::Serverless::Function", "DependsOn": "SomeOtherResource", "Properties": {}}),
            ("Function2", {"Type": "AWS::Serverless::Function", "a": "b", "Properties": {}}),
            ("Api", {"Type": "AWS::Serverless::Api", "Properties": {}}),
        ]

        actual = [(id, resource.to_dict()) for id, resource in template.iterate()]
        self.assertEquals(expected, actual)

    def test_iterate_must_filter_by_resource_type(self):

        template = SamTemplate(self.template_dict)

        type = "AWS::Serverless::Function"
        expected = [
            ("Function1", {"Type": "AWS::Serverless::Function", "DependsOn": "SomeOtherResource", "Properties": {}}),
            ("Function2", {"Type": "AWS::Serverless::Function", "a": "b", "Properties": {}}),
        ]

        actual = [(id, resource.to_dict()) for id, resource in template.iterate(type)]
        self.assertEquals(expected, actual)

    def test_iterate_must_not_return_non_sam_resources_with_filter(self):
        template = SamTemplate(self.template_dict)

        type = "AWS::Lambda::Function"
        expected = []

        actual = [(id, resource.to_dict()) for id, resource in template.iterate(type)]
        self.assertEquals(expected, actual)

    def test_iterate_must_filter_with_resource_not_found(self):
        template = SamTemplate(self.template_dict)

        type = "AWS::Serverless::SimpleTable"
        expected = []

        actual = [(id, resource.to_dict()) for id, resource in template.iterate(type)]
        self.assertEquals(expected, actual)

    def test_set_must_add_to_template(self):
        template = SamTemplate(self.template_dict)
        template.set("NewResource", {"Type": "something"})

        # Set would modify the original template dictionary
        self.assertEquals(self.template_dict["Resources"].get("NewResource"), {"Type": "something"})

    def test_set_must_work_with_sam_resource_input(self):
        template = SamTemplate(self.template_dict)
        template.set("NewResource", SamResource({"Type": "something"}))

        # Set would modify the original template dictionary
        self.assertEquals(self.template_dict["Resources"].get("NewResource"), {"Type": "something"})

    def test_get_must_return_resource(self):
        expected = {
            "Type": "AWS::Serverless::Function",
             "DependsOn": "SomeOtherResource",
            "Properties": {}
         }

        template = SamTemplate(self.template_dict)

        actual = template.get("Function1")
        self.assertIsNotNone(actual)
        self.assertTrue(isinstance(actual, SamResource))
        self.assertEquals(actual.to_dict(), expected)

    def test_get_must_return_none_for_unknown_resource(self):
        template = SamTemplate(self.template_dict)

        actual = template.get("Something")
        self.assertIsNone(actual)

    def test_delete_must_delete_resource(self):
        id = "Function1"
        template = SamTemplate(self.template_dict)

        # Check if it exists
        self.assertIsNotNone(template.get(id))
        # Delete
        template.delete(id)
        # Check that it does not exist
        self.assertIsNone(template.get(id))

    def test_delete_must_skip_resource_not_present(self):
        id = "SomeResource"
        template = SamTemplate(self.template_dict)

        self.assertIsNone(template.get(id))
        template.delete(id)
        self.assertIsNone(template.get(id))

    def test_to_dict_must_not_modify_non_resource_properties(self):
        template = SamTemplate(self.template_dict)

        # Verify that actual references match - Input should be untouched
        self.assertTrue(template.to_dict()["Properties"] is self.template_dict["Properties"])
        self.assertTrue(template.to_dict()["Metadata"] is self.template_dict["Metadata"])
