import json

from moto.awslambda.policy import Policy


class MockLambdaFunction:
    def __init__(self, arn):
        self.function_arn = arn
        self.policy = None


def test_policy():
    policy = Policy(MockLambdaFunction("arn"))
    statement = {
        "StatementId": "statement0",
        "Action": "lambda:InvokeFunction",
        "FunctionName": "function_name",
        "Principal": "events.amazonaws.com",
        "SourceArn": "arn:aws:events:us-east-1:111111111111:rule/rule_name",
        "SourceAccount": "111111111111",
    }

    expected = {
        "Action": "lambda:InvokeFunction",
        "FunctionName": "function_name",
        "Principal": {"Service": "events.amazonaws.com"},
        "Effect": "Allow",
        "Resource": "arn",
        "Sid": "statement0",
        "Condition": {
            "ArnLike": {
                "AWS:SourceArn": "arn:aws:events:us-east-1:111111111111:rule/rule_name",
            },
            "StringEquals": {"AWS:SourceAccount": "111111111111"},
        },
    }

    policy.add_statement(json.dumps(statement))
    assert expected == policy.statements[0]

    sid = statement.get("StatementId")
    assert sid is not None

    policy.del_statement(sid)
    assert [] == policy.statements
