package aws

import (
	"errors"
	"fmt"
	"testing"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/elbv2"
	"github.com/hashicorp/errwrap"
	"github.com/hashicorp/terraform/helper/acctest"
	"github.com/hashicorp/terraform/helper/resource"
	"github.com/hashicorp/terraform/terraform"
)

func TestAccAWSALBListenerRule_basic(t *testing.T) {
	var conf elbv2.Rule
	albName := fmt.Sprintf("testrule-basic-%s", acctest.RandStringFromCharSet(13, acctest.CharSetAlphaNum))
	targetGroupName := fmt.Sprintf("testtargetgroup-%s", acctest.RandStringFromCharSet(10, acctest.CharSetAlphaNum))

	resource.Test(t, resource.TestCase{
		PreCheck:      func() { testAccPreCheck(t) },
		IDRefreshName: "aws_alb_listener_rule.static",
		Providers:     testAccProviders,
		CheckDestroy:  testAccCheckAWSALBListenerRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccAWSALBListenerRuleConfig_basic(albName, targetGroupName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckAWSALBListenerRuleExists("aws_alb_listener_rule.static", &conf),
					resource.TestCheckResourceAttrSet("aws_alb_listener_rule.static", "arn"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "priority", "100"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "action.#", "1"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "action.0.type", "forward"),
					resource.TestCheckResourceAttrSet("aws_alb_listener_rule.static", "action.0.target_group_arn"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "condition.#", "1"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "condition.0.field", "path-pattern"),
					resource.TestCheckResourceAttr("aws_alb_listener_rule.static", "condition.0.values.#", "1"),
					resource.TestCheckResourceAttrSet("aws_alb_listener_rule.static", "condition.0.values.0"),
				),
			},
		},
	})
}

func testAccCheckAWSALBListenerRuleExists(n string, res *elbv2.Rule) 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 errors.New("No Listener Rule ID is set")
		}

		conn := testAccProvider.Meta().(*AWSClient).elbv2conn

		describe, err := conn.DescribeRules(&elbv2.DescribeRulesInput{
			RuleArns: []*string{aws.String(rs.Primary.ID)},
		})

		if err != nil {
			return err
		}

		if len(describe.Rules) != 1 ||
			*describe.Rules[0].RuleArn != rs.Primary.ID {
			return errors.New("Listener Rule not found")
		}

		*res = *describe.Rules[0]
		return nil
	}
}

func testAccCheckAWSALBListenerRuleDestroy(s *terraform.State) error {
	conn := testAccProvider.Meta().(*AWSClient).elbv2conn

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

		describe, err := conn.DescribeRules(&elbv2.DescribeRulesInput{
			RuleArns: []*string{aws.String(rs.Primary.ID)},
		})

		if err == nil {
			if len(describe.Rules) != 0 &&
				*describe.Rules[0].RuleArn == rs.Primary.ID {
				return fmt.Errorf("Listener Rule %q still exists", rs.Primary.ID)
			}
		}

		// Verify the error
		if isRuleNotFound(err) {
			return nil
		} else {
			return errwrap.Wrapf("Unexpected error checking ALB Listener Rule destroyed: {{err}}", err)
		}
	}

	return nil
}

func testAccAWSALBListenerRuleConfig_basic(albName, targetGroupName string) string {
	return fmt.Sprintf(`resource "aws_alb_listener_rule" "static" {
  listener_arn = "${aws_alb_listener.front_end.arn}"
  priority = 100

  action {
    type = "forward"
    target_group_arn = "${aws_alb_target_group.test.arn}"
  }

  condition {
    field = "path-pattern"
    values = ["/static/*"]
  }
}

resource "aws_alb_listener" "front_end" {
   load_balancer_arn = "${aws_alb.alb_test.id}"
   protocol = "HTTP"
   port = "80"

   default_action {
     target_group_arn = "${aws_alb_target_group.test.id}"
     type = "forward"
   }
}

resource "aws_alb" "alb_test" {
  name            = "%s"
  internal        = true
  security_groups = ["${aws_security_group.alb_test.id}"]
  subnets         = ["${aws_subnet.alb_test.*.id}"]

  idle_timeout = 30
  enable_deletion_protection = false

  tags {
    TestName = "TestAccAWSALB_basic"
  }
}

resource "aws_alb_target_group" "test" {
  name = "%s"
  port = 8080
  protocol = "HTTP"
  vpc_id = "${aws_vpc.alb_test.id}"

  health_check {
    path = "/health"
    interval = 60
    port = 8081
    protocol = "HTTP"
    timeout = 3
    healthy_threshold = 3
    unhealthy_threshold = 3
    matcher = "200-299"
  }
}

variable "subnets" {
  default = ["10.0.1.0/24", "10.0.2.0/24"]
  type    = "list"
}

data "aws_availability_zones" "available" {}

resource "aws_vpc" "alb_test" {
  cidr_block = "10.0.0.0/16"

  tags {
    TestName = "TestAccAWSALB_basic"
  }
}

resource "aws_subnet" "alb_test" {
  count                   = 2
  vpc_id                  = "${aws_vpc.alb_test.id}"
  cidr_block              = "${element(var.subnets, count.index)}"
  map_public_ip_on_launch = true
  availability_zone       = "${element(data.aws_availability_zones.available.names, count.index)}"

  tags {
    TestName = "TestAccAWSALB_basic"
  }
}

resource "aws_security_group" "alb_test" {
  name        = "allow_all_alb_test"
  description = "Used for ALB Testing"
  vpc_id      = "${aws_vpc.alb_test.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"]
  }

  tags {
    TestName = "TestAccAWSALB_basic"
  }
}`, albName, targetGroupName)
}