package main

import (
	"context"
	"fmt"
	"github.com/aws/aws-lambda-go/lambda"
	"{{ cookiecutter.project_name }}/hello-world/model/aws/ec2"
	"{{ cookiecutter.project_name }}/hello-world/model/aws/ec2/marshaller"
)

/*
Description: This lambda handler reads an EC2 Instance Change Notification from the inputted AWSEvent, then updates the
    Detail Type (description of the type of AWS event).
Parameters:
- context: Object that provides information about the Lambda invocation, function, and execution environment.
- awsEvent: AWS EventBridge object that provides information such as the source, region, account the
    event is associated with.
Output: Stream ([]byte) of the updated AWSEvent after function logic completed.
*/
func handler(context context.Context, awsEvent ec2.AWSEvent) ([]byte , error) {
	// Retrieve the ec2 notification from the event
	ec2InstanceStateChangeNotification := awsEvent.Detail

	// Developers write your event-driven business logic code here!
	fmt.Println("Instance " + ec2InstanceStateChangeNotification.InstanceId + " transitioned to " + ec2InstanceStateChangeNotification.State)

	// Make updates to the event payload
	awsEvent.SetDetailType("HelloWorldFunction updated event of " + awsEvent.DetailType)

	// Return event as stream for further processing
	return marshaller.Marshal(awsEvent)

}

func main() {
	lambda.Start(handler)
}