from os import path

from aws_cdk import core
import aws_cdk.aws_lambda as lmb
import aws_cdk.aws_apigateway as apigw
import aws_cdk.aws_codedeploy as codedeploy
import aws_cdk.aws_cloudwatch as cloudwatch


class PipelinesWebinarStack(core.Stack):
    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
        super().__init__(scope, id, **kwargs)

        # The code that defines your stack goes here
        this_dir = path.dirname(__file__)

        handler = lmb.Function(
            self,
            "Handler",
            runtime=lmb.Runtime.PYTHON_3_7,
            handler="handler.handler",
            code=lmb.Code.from_asset(path.join(this_dir, "lambda")),
        )

        alias = lmb.Alias(
            self, "HandlerAlias", alias_name="Current", version=handler.current_version
        )

        gw = apigw.LambdaRestApi(
            self,
            "Gateway",
            description="Endpoint for a simple Lambda-powered web service",
            handler=alias,
        )

        failure_alarm = cloudwatch.Alarm(
            self,
            "FailureAlarm",
            metric=cloudwatch.Metric(
                metric_name="5XXError",
                namespace="AWS/ApiGateway",
                dimensions={
                    "ApiName": "Gateway",
                },
                statistic="Sum",
                period=core.Duration.minutes(1),
            ),
            threshold=1,
            evaluation_periods=1,
        )

        codedeploy.LambdaDeploymentGroup(
            self,
            "DeploymentGroup",
            alias=alias,
            deployment_config=codedeploy.LambdaDeploymentConfig.CANARY_10_PERCENT_10_MINUTES,
            alarms=[failure_alarm],
        )

        self.url_output = core.CfnOutput(self, "Url", value=gw.url)