package google

import (
	"fmt"
	"testing"

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

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

	context := map[string]interface{}{
		"random_suffix": acctest.RandString(10),
	}

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckComputeBackendServiceSignedUrlKeyDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccComputeBackendServiceSignedUrlKey_basic(context),
				Check:  testAccCheckComputeBackendServiceSignedUrlKeyCreated,
			},
		},
	})
}

func testAccComputeBackendServiceSignedUrlKey_basic(context map[string]interface{}) string {
	return Nprintf(`
resource "google_compute_backend_service_signed_url_key" "backend_key" {
  name           = "testkey-%{random_suffix}"
  key_value      = "iAmAFakeKeyRandomBytes=="
  backend_service = "${google_compute_backend_service.test_bs.name}"
}

resource "google_compute_backend_service" "test_bs" {
  name          = "testbs-%{random_suffix}"
  health_checks = ["${google_compute_http_health_check.zero.self_link}"]
}

resource "google_compute_http_health_check" "zero" {
  name               = "test-check-%{random_suffix}"
  request_path       = "/"
  check_interval_sec = 1
  timeout_sec        = 1
}
`, context)
}

func testAccCheckComputeBackendServiceSignedUrlKeyDestroy(s *terraform.State) error {
	exists, err := checkComputeBackendServiceSignedUrlKeyExists(s)
	if err != nil && !isGoogleApiErrorWithCode(err, 404) {
		return err
	}
	if exists {
		return fmt.Errorf("ComputeBackendServiceSignedUrlKey still exists")
	}
	return nil
}

func testAccCheckComputeBackendServiceSignedUrlKeyCreated(s *terraform.State) error {
	exists, err := checkComputeBackendServiceSignedUrlKeyExists(s)
	if err != nil {
		return err
	}
	if !exists {
		return fmt.Errorf("expected ComputeBackendServiceSignedUrlKey to have been created")
	}
	return nil
}

func checkComputeBackendServiceSignedUrlKeyExists(s *terraform.State) (bool, error) {
	for name, rs := range s.RootModule().Resources {
		if rs.Type != "google_compute_backend_service_signed_url_key" {
			continue
		}
		if strings.HasPrefix(name, "data.") {
			continue
		}

		config := testAccProvider.Meta().(*Config)
		keyName := rs.Primary.ID

		url, err := replaceVarsForTest(rs, "https://www.googleapis.com/compute/v1/projects/{{project}}/global/backendServices/{{backend_service}}")
		if err != nil {
			return false, err
		}

		res, err := sendRequest(config, "GET", url, nil)
		if err == nil {
			policyRaw, ok := res["cdnPolicy"]
			if !ok {
				return false, nil
			}

			policy := policyRaw.(map[string]interface{})
			keyNames, ok := policy["signedUrlKeyNames"]
			if !ok {
				return false, nil
			}

			// Because the sensitive key value is not returned, all we can do is verify a
			// key with this name exists and assume the key value hasn't been changed.
			for _, k := range keyNames.([]interface{}) {
				if k.(string) == keyName {
					// Just return empty map to indicate key was found
					return true, nil
				}
			}
		}
	}

	return false, nil
}