package common

import (
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/ec2"
	"github.com/hashicorp/packer/builder"
	"github.com/hashicorp/packer/helper/multistep"
)

type BuildInfoTemplate struct {
	BuildRegion           string
	SourceAMI             string
	SourceAMICreationDate string
	SourceAMIName         string
	SourceAMIOwner        string
	SourceAMIOwnerName    string
	SourceAMITags         map[string]string
}

func extractBuildInfo(region string, state multistep.StateBag, generatedData *builder.GeneratedData) *BuildInfoTemplate {
	rawSourceAMI, hasSourceAMI := state.GetOk("source_image")
	if !hasSourceAMI {
		return &BuildInfoTemplate{
			BuildRegion: region,
		}
	}

	sourceAMI := rawSourceAMI.(*ec2.Image)
	sourceAMITags := make(map[string]string, len(sourceAMI.Tags))
	for _, tag := range sourceAMI.Tags {
		sourceAMITags[aws.StringValue(tag.Key)] = aws.StringValue(tag.Value)
	}

	buildInfoTemplate := &BuildInfoTemplate{
		BuildRegion:           region,
		SourceAMI:             aws.StringValue(sourceAMI.ImageId),
		SourceAMICreationDate: aws.StringValue(sourceAMI.CreationDate),
		SourceAMIName:         aws.StringValue(sourceAMI.Name),
		SourceAMIOwner:        aws.StringValue(sourceAMI.OwnerId),
		SourceAMIOwnerName:    aws.StringValue(sourceAMI.ImageOwnerAlias),
		SourceAMITags:         sourceAMITags,
	}
	generatedData.Put("SourceAMIName", buildInfoTemplate.SourceAMIName)
	return buildInfoTemplate
}