package aws

import (
	"fmt"
	"log"
	"testing"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/emr"
	"github.com/hashicorp/terraform/helper/acctest"
	"github.com/hashicorp/terraform/helper/resource"
	"github.com/hashicorp/terraform/terraform"
)

func TestAccAWSEMRCluster_basic(t *testing.T) {
	var jobFlow emr.RunJobFlowOutput
	r := acctest.RandInt()
	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckAWSEmrDestroy,
		Steps: []resource.TestStep{
			resource.TestStep{
				Config: testAccAWSEmrClusterConfig(r),
				Check:  testAccCheckAWSEmrClusterExists("aws_emr_cluster.tf-test-cluster", &jobFlow),
			},
		},
	})
}

func testAccCheckAWSEmrDestroy(s *terraform.State) error {
	conn := testAccProvider.Meta().(*AWSClient).emrconn

	for _, rs := range s.RootModule().Resources {
		if rs.Type != "aws_emr_cluster" {
			continue
		}

		params := &emr.DescribeClusterInput{
			ClusterId: aws.String(rs.Primary.ID),
		}

		describe, err := conn.DescribeCluster(params)

		if err == nil {
			if describe.Cluster != nil &&
				*describe.Cluster.Status.State == "WAITING" {
				return fmt.Errorf("EMR Cluster still exists")
			}
		}

		providerErr, ok := err.(awserr.Error)
		if !ok {
			return err
		}

		log.Printf("[ERROR] %v", providerErr)
	}

	return nil
}

func testAccCheckAWSEmrClusterExists(n string, v *emr.RunJobFlowOutput) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, ok := s.RootModule().Resources[n]
		if !ok {
			return fmt.Errorf("Not found: %s", n)
		}
		if rs.Primary.ID == "" {
			return fmt.Errorf("No cluster id set")
		}
		conn := testAccProvider.Meta().(*AWSClient).emrconn
		describe, err := conn.DescribeCluster(&emr.DescribeClusterInput{
			ClusterId: aws.String(rs.Primary.ID),
		})
		if err != nil {
			return fmt.Errorf("EMR error: %v", err)
		}

		if describe.Cluster != nil &&
			*describe.Cluster.Id != rs.Primary.ID {
			return fmt.Errorf("EMR cluser not found")
		}

		if describe.Cluster != nil &&
			*describe.Cluster.Status.State != "WAITING" {
			return fmt.Errorf("EMR cluser is not up yet")
		}

		return nil
	}
}

func testAccAWSEmrClusterConfig(r int) string {
	return fmt.Sprintf(`
provider "aws" {
  region = "us-west-2"
}

resource "aws_emr_cluster" "tf-test-cluster" {
  name          = "emr-test-%d"
  release_label = "emr-4.6.0"
  applications  = ["Spark"]

  ec2_attributes {
    subnet_id                         = "${aws_subnet.main.id}"
    emr_managed_master_security_group = "${aws_security_group.allow_all.id}"
    emr_managed_slave_security_group  = "${aws_security_group.allow_all.id}"
    instance_profile                  = "${aws_iam_instance_profile.emr_profile.arn}"
  }

  master_instance_type = "m3.xlarge"
  core_instance_type   = "m3.xlarge"
  core_instance_count  = 1

  tags {
    role     = "rolename"
    dns_zone = "env_zone"
    env      = "env"
    name     = "name-env"
  }

  bootstrap_action {
    path = "s3://elasticmapreduce/bootstrap-actions/run-if"
    name = "runif"
    args = ["instance.isMaster=true", "echo running on master node"]
  }

  configurations = "test-fixtures/emr_configurations.json"

  depends_on = ["aws_main_route_table_association.a"]

  service_role = "${aws_iam_role.iam_emr_default_role.arn}"
}

resource "aws_security_group" "allow_all" {
  name        = "allow_all"
  description = "Allow all inbound traffic"
  vpc_id      = "${aws_vpc.main.id}"

  ingress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  depends_on = ["aws_subnet.main"]

  lifecycle {
    ignore_changes = ["ingress", "egress"]
  }

  tags {
    name = "emr_test"
  }
}

resource "aws_vpc" "main" {
  cidr_block           = "168.31.0.0/16"
  enable_dns_hostnames = true

  tags {
    name = "emr_test"
  }
}

resource "aws_subnet" "main" {
  vpc_id     = "${aws_vpc.main.id}"
  cidr_block = "168.31.0.0/20"

  tags {
    name = "emr_test"
  }
}

resource "aws_internet_gateway" "gw" {
  vpc_id = "${aws_vpc.main.id}"
}

resource "aws_route_table" "r" {
  vpc_id = "${aws_vpc.main.id}"

  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = "${aws_internet_gateway.gw.id}"
  }
}

resource "aws_main_route_table_association" "a" {
  vpc_id         = "${aws_vpc.main.id}"
  route_table_id = "${aws_route_table.r.id}"
}

###

# IAM things

###

# IAM role for EMR Service
resource "aws_iam_role" "iam_emr_default_role" {
  name = "iam_emr_default_role_%d"

  assume_role_policy = <<EOT
{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": "elasticmapreduce.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOT
}

resource "aws_iam_role_policy_attachment" "service-attach" {
  role       = "${aws_iam_role.iam_emr_default_role.id}"
  policy_arn = "${aws_iam_policy.iam_emr_default_policy.arn}"
}

resource "aws_iam_policy" "iam_emr_default_policy" {
  name = "iam_emr_default_policy_%d"

  policy = <<EOT
{
    "Version": "2012-10-17",
    "Statement": [{
        "Effect": "Allow",
        "Resource": "*",
        "Action": [
            "ec2:AuthorizeSecurityGroupEgress",
            "ec2:AuthorizeSecurityGroupIngress",
            "ec2:CancelSpotInstanceRequests",
            "ec2:CreateNetworkInterface",
            "ec2:CreateSecurityGroup",
            "ec2:CreateTags",
            "ec2:DeleteNetworkInterface",
            "ec2:DeleteSecurityGroup",
            "ec2:DeleteTags",
            "ec2:DescribeAvailabilityZones",
            "ec2:DescribeAccountAttributes",
            "ec2:DescribeDhcpOptions",
            "ec2:DescribeInstanceStatus",
            "ec2:DescribeInstances",
            "ec2:DescribeKeyPairs",
            "ec2:DescribeNetworkAcls",
            "ec2:DescribeNetworkInterfaces",
            "ec2:DescribePrefixLists",
            "ec2:DescribeRouteTables",
            "ec2:DescribeSecurityGroups",
            "ec2:DescribeSpotInstanceRequests",
            "ec2:DescribeSpotPriceHistory",
            "ec2:DescribeSubnets",
            "ec2:DescribeVpcAttribute",
            "ec2:DescribeVpcEndpoints",
            "ec2:DescribeVpcEndpointServices",
            "ec2:DescribeVpcs",
            "ec2:DetachNetworkInterface",
            "ec2:ModifyImageAttribute",
            "ec2:ModifyInstanceAttribute",
            "ec2:RequestSpotInstances",
            "ec2:RevokeSecurityGroupEgress",
            "ec2:RunInstances",
            "ec2:TerminateInstances",
            "ec2:DeleteVolume",
            "ec2:DescribeVolumeStatus",
            "ec2:DescribeVolumes",
            "ec2:DetachVolume",
            "iam:GetRole",
            "iam:GetRolePolicy",
            "iam:ListInstanceProfiles",
            "iam:ListRolePolicies",
            "iam:PassRole",
            "s3:CreateBucket",
            "s3:Get*",
            "s3:List*",
            "sdb:BatchPutAttributes",
            "sdb:Select",
            "sqs:CreateQueue",
            "sqs:Delete*",
            "sqs:GetQueue*",
            "sqs:PurgeQueue",
            "sqs:ReceiveMessage"
        ]
    }]
}
EOT
}

# IAM Role for EC2 Instance Profile
resource "aws_iam_role" "iam_emr_profile_role" {
  name = "iam_emr_profile_role_%d"

  assume_role_policy = <<EOT
{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": "ec2.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOT
}

resource "aws_iam_instance_profile" "emr_profile" {
  name  = "emr_profile_%d"
  roles = ["${aws_iam_role.iam_emr_profile_role.name}"]
}

resource "aws_iam_role_policy_attachment" "profile-attach" {
  role       = "${aws_iam_role.iam_emr_profile_role.id}"
  policy_arn = "${aws_iam_policy.iam_emr_profile_policy.arn}"
}

resource "aws_iam_policy" "iam_emr_profile_policy" {
  name = "iam_emr_profile_policy_%d"

  policy = <<EOT
{
    "Version": "2012-10-17",
    "Statement": [{
        "Effect": "Allow",
        "Resource": "*",
        "Action": [
            "cloudwatch:*",
            "dynamodb:*",
            "ec2:Describe*",
            "elasticmapreduce:Describe*",
            "elasticmapreduce:ListBootstrapActions",
            "elasticmapreduce:ListClusters",
            "elasticmapreduce:ListInstanceGroups",
            "elasticmapreduce:ListInstances",
            "elasticmapreduce:ListSteps",
            "kinesis:CreateStream",
            "kinesis:DeleteStream",
            "kinesis:DescribeStream",
            "kinesis:GetRecords",
            "kinesis:GetShardIterator",
            "kinesis:MergeShards",
            "kinesis:PutRecord",
            "kinesis:SplitShard",
            "rds:Describe*",
            "s3:*",
            "sdb:*",
            "sns:*",
            "sqs:*"
        ]
    }]
}
EOT
}
`, r, r, r, r, r, r)
}