package aws

import (
	"fmt"
	"strings"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/ecs"
	"github.com/hashicorp/terraform/helper/schema"
)

func dataSourceAwsEcsContainerDefinition() *schema.Resource {
	return &schema.Resource{
		Read: dataSourceAwsEcsContainerDefinitionRead,

		Schema: map[string]*schema.Schema{
			"task_definition": &schema.Schema{
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
			},
			"container_name": &schema.Schema{
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
			},
			// Computed values.
			"image": &schema.Schema{
				Type:     schema.TypeString,
				Computed: true,
			},
			"image_digest": &schema.Schema{
				Type:     schema.TypeString,
				Computed: true,
			},
			"cpu": &schema.Schema{
				Type:     schema.TypeInt,
				Computed: true,
			},
			"memory": &schema.Schema{
				Type:     schema.TypeInt,
				Computed: true,
			},
			"memory_reservation": &schema.Schema{
				Type:     schema.TypeInt,
				Computed: true,
			},
			"disable_networking": &schema.Schema{
				Type:     schema.TypeBool,
				Computed: true,
			},
			"docker_labels": &schema.Schema{
				Type:     schema.TypeMap,
				Computed: true,
				Elem:     schema.TypeString,
			},
			"environment": &schema.Schema{
				Type:     schema.TypeMap,
				Computed: true,
				Elem:     schema.TypeString,
			},
		},
	}
}

func dataSourceAwsEcsContainerDefinitionRead(d *schema.ResourceData, meta interface{}) error {
	conn := meta.(*AWSClient).ecsconn

	desc, err := conn.DescribeTaskDefinition(&ecs.DescribeTaskDefinitionInput{
		TaskDefinition: aws.String(d.Get("task_definition").(string)),
	})

	if err != nil {
		return err
	}

	taskDefinition := *desc.TaskDefinition
	for _, def := range taskDefinition.ContainerDefinitions {
		if aws.StringValue(def.Name) != d.Get("container_name").(string) {
			continue
		}

		d.SetId(fmt.Sprintf("%s/%s", aws.StringValue(taskDefinition.TaskDefinitionArn), d.Get("container_name").(string)))
		d.Set("image", aws.StringValue(def.Image))
		image := aws.StringValue(def.Image)
		if strings.Contains(image, ":") {
			d.Set("image_digest", strings.Split(image, ":")[1])
		}
		d.Set("cpu", aws.Int64Value(def.Cpu))
		d.Set("memory", aws.Int64Value(def.Memory))
		d.Set("memory_reservation", aws.Int64Value(def.MemoryReservation))
		d.Set("disable_networking", aws.BoolValue(def.DisableNetworking))
		d.Set("docker_labels", aws.StringValueMap(def.DockerLabels))

		var environment = map[string]string{}
		for _, keyValuePair := range def.Environment {
			environment[aws.StringValue(keyValuePair.Name)] = aws.StringValue(keyValuePair.Value)
		}
		d.Set("environment", environment)
	}

	if d.Id() == "" {
		return fmt.Errorf("container with name %q not found in task definition %q", d.Get("container_name").(string), d.Get("task_definition").(string))
	}

	return nil
}