package google

import (
	"fmt"
	"testing"

	"github.com/hashicorp/terraform/helper/acctest"
	"github.com/hashicorp/terraform/helper/resource"
	"github.com/hashicorp/terraform/terraform"
)

func TestAccInstanceGroupManager_basic(t *testing.T) {
	t.Parallel()

	template := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	target := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm1 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm2 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_basic(template, target, igm1, igm2),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-no-tp",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_targetSizeZero(t *testing.T) {
	t.Parallel()

	templateName := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igmName := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_targetSizeZero(templateName, igmName),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_update(t *testing.T) {
	t.Parallel()

	template1 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	target1 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	target2 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	template2 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_update(template1, target1, igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-update",
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				Config: testAccInstanceGroupManager_update2(template1, target1, target2, template2, igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-update",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_updateLifecycle(t *testing.T) {
	t.Parallel()

	tag1 := "tag1"
	tag2 := "tag2"
	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_updateLifecycle(tag1, igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-update",
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				Config: testAccInstanceGroupManager_updateLifecycle(tag2, igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-update",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_updateStrategy(t *testing.T) {
	t.Parallel()

	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_updateStrategy(igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-update-strategy",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_rollingUpdatePolicy(t *testing.T) {
	t.Parallel()

	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_rollingUpdatePolicy(igm),
			},
			// No import step because rolling updates are broken and the field will be removed in 2.0.0.
			// TODO(danawillow): Remove this test once we've removed the field.
			{
				Config: testAccInstanceGroupManager_rollingUpdatePolicy2(igm),
			},
		},
	})
}

func TestAccInstanceGroupManager_separateRegions(t *testing.T) {
	t.Parallel()

	igm1 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm2 := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_separateRegions(igm1, igm2),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic-2",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_versions(t *testing.T) {
	t.Parallel()

	primaryTemplate := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	canaryTemplate := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_versions(primaryTemplate, canaryTemplate, igm),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func TestAccInstanceGroupManager_autoHealingPolicies(t *testing.T) {
	t.Parallel()

	template := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	target := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	hck := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_autoHealingPolicies(template, target, igm, hck),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

// This test is to make sure that a single version resource can link to a versioned resource
// without perpetual diffs because the self links mismatch.
// Once auto_healing_policies is no longer beta, we will need to use a new field or resource
// with Beta fields.
func TestAccInstanceGroupManager_selfLinkStability(t *testing.T) {
	t.Parallel()

	template := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	target := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	igm := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	hck := fmt.Sprintf("igm-test-%s", acctest.RandString(10))
	autoscaler := fmt.Sprintf("igm-test-%s", acctest.RandString(10))

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckInstanceGroupManagerDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccInstanceGroupManager_selfLinkStability(template, target, igm, hck, autoscaler),
			},
			{
				ResourceName:      "google_compute_instance_group_manager.igm-basic",
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func testAccCheckInstanceGroupManagerDestroy(s *terraform.State) error {
	config := testAccProvider.Meta().(*Config)

	for _, rs := range s.RootModule().Resources {
		if rs.Type != "google_compute_instance_group_manager" {
			continue
		}
		id, err := parseInstanceGroupManagerId(rs.Primary.ID)
		if err != nil {
			return err
		}
		if id.Project == "" {
			id.Project = config.Project
		}
		if id.Zone == "" {
			id.Zone = rs.Primary.Attributes["zone"]
		}
		_, err = config.clientCompute.InstanceGroupManagers.Get(
			id.Project, id.Zone, id.Name).Do()
		if err == nil {
			return fmt.Errorf("InstanceGroupManager still exists")
		}
	}

	return nil
}

func testAccInstanceGroupManager_basic(template, target, igm1, igm2 string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-basic" {
		name = "%s"
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_target_pool" "igm-basic" {
		description = "Resource created for Terraform acceptance testing"
		name = "%s"
		session_affinity = "CLIENT_IP_PROTO"
	}

	resource "google_compute_instance_group_manager" "igm-basic" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-basic.self_link}"
		target_pools = ["${google_compute_target_pool.igm-basic.self_link}"]
		base_instance_name = "igm-basic"
		zone = "us-central1-c"
		target_size = 2
	}

	resource "google_compute_instance_group_manager" "igm-no-tp" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-basic.self_link}"
		base_instance_name = "igm-no-tp"
		zone = "us-central1-c"
		target_size = 2
	}
	`, template, target, igm1, igm2)
}

func testAccInstanceGroupManager_targetSizeZero(template, igm string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-basic" {
		name = "%s"
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_instance_group_manager" "igm-basic" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-basic.self_link}"
		base_instance_name = "igm-basic"
		zone = "us-central1-c"
	}
	`, template, igm)
}

func testAccInstanceGroupManager_update(template, target, igm string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-update" {
		name = "%s"
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_target_pool" "igm-update" {
		description = "Resource created for Terraform acceptance testing"
		name = "%s"
		session_affinity = "CLIENT_IP_PROTO"
	}

	resource "google_compute_instance_group_manager" "igm-update" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-update.self_link}"
		target_pools = ["${google_compute_target_pool.igm-update.self_link}"]
		base_instance_name = "igm-update"
		zone = "us-central1-c"
		target_size = 2
		named_port {
			name = "customhttp"
			port = 8080
		}
	}`, template, target, igm)
}

// Change IGM's instance template and target size
func testAccInstanceGroupManager_update2(template1, target1, target2, template2, igm string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-update" {
		name = "%s"
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_target_pool" "igm-update" {
		description = "Resource created for Terraform acceptance testing"
		name = "%s"
		session_affinity = "CLIENT_IP_PROTO"
	}

	resource "google_compute_target_pool" "igm-update2" {
		description = "Resource created for Terraform acceptance testing"
		name = "%s"
		session_affinity = "CLIENT_IP_PROTO"
	}

	resource "google_compute_instance_template" "igm-update2" {
		name = "%s"
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_instance_group_manager" "igm-update" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-update2.self_link}"
		target_pools = [
			"${google_compute_target_pool.igm-update.self_link}",
			"${google_compute_target_pool.igm-update2.self_link}",
		]
		base_instance_name = "igm-update"
		zone = "us-central1-c"
		target_size = 3
		named_port {
			name = "customhttp"
			port = 8080
		}
		named_port {
			name = "customhttps"
			port = 8443
		}
	}`, template1, target1, target2, template2, igm)
}

func testAccInstanceGroupManager_updateLifecycle(tag, igm string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-update" {
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["%s"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}

		lifecycle {
			create_before_destroy = true
		}
	}

	resource "google_compute_instance_group_manager" "igm-update" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-update.self_link}"
		base_instance_name = "igm-update"
		zone = "us-central1-c"
		target_size = 2
		named_port {
			name = "customhttp"
			port = 8080
		}
	}`, tag, igm)
}

func testAccInstanceGroupManager_updateStrategy(igm string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-update-strategy" {
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["terraform-testing"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}

		lifecycle {
			create_before_destroy = true
		}
	}

	resource "google_compute_instance_group_manager" "igm-update-strategy" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-update-strategy.self_link}"
		base_instance_name = "igm-update-strategy"
		zone = "us-central1-c"
		target_size = 2
		update_strategy = "REPLACE"
		named_port {
			name = "customhttp"
			port = 8080
		}
	}`, igm)
}

func testAccInstanceGroupManager_rollingUpdatePolicy(igm string) string {
	return fmt.Sprintf(`
data "google_compute_image" "my_image" {
	family  = "debian-9"
	project = "debian-cloud"
}

resource "google_compute_instance_template" "igm-rolling-update-policy" {
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["terraform-testing"]

	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}

	network_interface {
		network = "default"
	}

	service_account {
		scopes = ["userinfo-email", "compute-ro", "storage-ro"]
	}

	lifecycle {
		create_before_destroy = true
	}
}

resource "google_compute_instance_group_manager" "igm-rolling-update-policy" {
	description = "Terraform test instance group manager"
	name = "%s"
	instance_template = "${google_compute_instance_template.igm-rolling-update-policy.self_link}"
	base_instance_name = "igm-rolling-update-policy"
	zone = "us-central1-c"
	target_size = 3
	update_strategy = "ROLLING_UPDATE"
	rolling_update_policy {
		type = "PROACTIVE"
		minimal_action = "REPLACE"
		max_surge_percent = 50
		max_unavailable_percent = 50
		min_ready_sec = 20
	}
	named_port {
		name = "customhttp"
		port = 8080
	}
}`, igm)
}

func testAccInstanceGroupManager_rollingUpdatePolicy2(igm string) string {
	return fmt.Sprintf(`
data "google_compute_image" "my_image" {
	family  = "debian-9"
	project = "debian-cloud"
}

resource "google_compute_instance_template" "igm-rolling-update-policy" {
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["terraform-testing"]

	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}

	network_interface {
		network = "default"
	}

	lifecycle {
		create_before_destroy = true
	}
}

resource "google_compute_instance_group_manager" "igm-rolling-update-policy" {
	description = "Terraform test instance group manager"
	name = "%s"
	instance_template = "${google_compute_instance_template.igm-rolling-update-policy.self_link}"
	base_instance_name = "igm-rolling-update-policy"
	zone = "us-central1-c"
	target_size = 3
	update_strategy = "ROLLING_UPDATE"
	rolling_update_policy {
		type = "PROACTIVE"
		minimal_action = "REPLACE"
		max_surge_fixed = 2
		max_unavailable_fixed = 2
		min_ready_sec = 20
	}
	named_port {
		name = "customhttp"
		port = 8080
	}
}`, igm)
}

func testAccInstanceGroupManager_separateRegions(igm1, igm2 string) string {
	return fmt.Sprintf(`
	data "google_compute_image" "my_image" {
		family  = "debian-9"
		project = "debian-cloud"
	}

	resource "google_compute_instance_template" "igm-basic" {
		machine_type = "n1-standard-1"
		can_ip_forward = false
		tags = ["foo", "bar"]

		disk {
			source_image = "${data.google_compute_image.my_image.self_link}"
			auto_delete = true
			boot = true
		}

		network_interface {
			network = "default"
		}

		metadata {
			foo = "bar"
		}

		service_account {
			scopes = ["userinfo-email", "compute-ro", "storage-ro"]
		}
	}

	resource "google_compute_instance_group_manager" "igm-basic" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-basic.self_link}"
		base_instance_name = "igm-basic"
		zone = "us-central1-c"
		target_size = 2
	}

	resource "google_compute_instance_group_manager" "igm-basic-2" {
		description = "Terraform test instance group manager"
		name = "%s"
		instance_template = "${google_compute_instance_template.igm-basic.self_link}"
		base_instance_name = "igm-basic-2"
		zone = "us-west1-b"
		target_size = 2
	}
	`, igm1, igm2)
}

func testAccInstanceGroupManager_autoHealingPolicies(template, target, igm, hck string) string {
	return fmt.Sprintf(`
data "google_compute_image" "my_image" {
	family  = "debian-9"
	project = "debian-cloud"
}

resource "google_compute_instance_template" "igm-basic" {
	name = "%s"
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["foo", "bar"]
	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}
	network_interface {
		network = "default"
	}
	metadata {
		foo = "bar"
	}
	service_account {
		scopes = ["userinfo-email", "compute-ro", "storage-ro"]
	}
}

resource "google_compute_target_pool" "igm-basic" {
	description = "Resource created for Terraform acceptance testing"
	name = "%s"
	session_affinity = "CLIENT_IP_PROTO"
}

resource "google_compute_instance_group_manager" "igm-basic" {
	description = "Terraform test instance group manager"
	name = "%s"
	instance_template = "${google_compute_instance_template.igm-basic.self_link}"
	target_pools = ["${google_compute_target_pool.igm-basic.self_link}"]
	base_instance_name = "igm-basic"
	zone = "us-central1-c"
	target_size = 2
	auto_healing_policies {
		health_check = "${google_compute_http_health_check.zero.self_link}"
		initial_delay_sec = "10"
	}
}

resource "google_compute_http_health_check" "zero" {
	name               = "%s"
	request_path       = "/"
	check_interval_sec = 1
	timeout_sec        = 1
}
	`, template, target, igm, hck)
}

func testAccInstanceGroupManager_versions(primaryTemplate string, canaryTemplate string, igm string) string {
	return fmt.Sprintf(`
data "google_compute_image" "my_image" {
	family  = "debian-9"
	project = "debian-cloud"
}

resource "google_compute_instance_template" "igm-primary" {
	name = "%s"
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["foo", "bar"]
	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}
	network_interface {
		network = "default"
	}
	metadata {
		foo = "bar"
	}
	service_account {
		scopes = ["userinfo-email", "compute-ro", "storage-ro"]
	}
}

resource "google_compute_instance_template" "igm-canary" {
	name = "%s"
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["foo", "bar"]
	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}
	network_interface {
		network = "default"
	}
	metadata {
		foo = "bar"
	}
	service_account {
		scopes = ["userinfo-email", "compute-ro", "storage-ro"]
	}
}

resource "google_compute_instance_group_manager" "igm-basic" {
	description = "Terraform test instance group manager"
	name = "%s"
	base_instance_name = "igm-basic"
	zone = "us-central1-c"
	target_size = 2

	version {
		name = "primary"
		instance_template = "${google_compute_instance_template.igm-primary.self_link}"
	}

	version {
		name = "canary"
		instance_template = "${google_compute_instance_template.igm-canary.self_link}"
		target_size {
			fixed = 1
		}
	}
}
	`, primaryTemplate, canaryTemplate, igm)
}

// This test is to make sure that a single version resource can link to a versioned resource
// without perpetual diffs because the self links mismatch.
// Once auto_healing_policies is no longer beta, we will need to use a new field or resource
// with Beta fields.
func testAccInstanceGroupManager_selfLinkStability(template, target, igm, hck, autoscaler string) string {
	return fmt.Sprintf(`
data "google_compute_image" "my_image" {
	family  = "debian-9"
	project = "debian-cloud"
}

resource "google_compute_instance_template" "igm-basic" {
	name = "%s"
	machine_type = "n1-standard-1"
	can_ip_forward = false
	tags = ["foo", "bar"]
	disk {
		source_image = "${data.google_compute_image.my_image.self_link}"
		auto_delete = true
		boot = true
	}
	network_interface {
		network = "default"
	}
	metadata {
		foo = "bar"
	}
	service_account {
		scopes = ["userinfo-email", "compute-ro", "storage-ro"]
	}
}

resource "google_compute_target_pool" "igm-basic" {
	description = "Resource created for Terraform acceptance testing"
	name = "%s"
	session_affinity = "CLIENT_IP_PROTO"
}

resource "google_compute_instance_group_manager" "igm-basic" {
	description = "Terraform test instance group manager"
	name = "%s"
	instance_template = "${google_compute_instance_template.igm-basic.self_link}"
	target_pools = ["${google_compute_target_pool.igm-basic.self_link}"]
	base_instance_name = "igm-basic"
	zone = "us-central1-c"
	target_size = 2
	auto_healing_policies {
		health_check = "${google_compute_http_health_check.zero.self_link}"
		initial_delay_sec = "10"
	}
}

resource "google_compute_http_health_check" "zero" {
	name               = "%s"
	request_path       = "/"
	check_interval_sec = 1
	timeout_sec        = 1
}

resource "google_compute_autoscaler" "foobar" {
	name = "%s"
	zone = "us-central1-c"
	target = "${google_compute_instance_group_manager.igm-basic.self_link}"
	autoscaling_policy = {
		max_replicas = 10
		min_replicas = 1
		cooldown_period = 60
		cpu_utilization = {
			target = 0.5
		}
	}
}
`, template, target, igm, hck, autoscaler)
}