package aws

import (
	"fmt"
	"testing"

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

func TestAccDataSourceAwsSubnet_basic(t *testing.T) {
	rInt := acctest.RandIntRange(0, 256)

	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckVpcDestroy,
		Steps: []resource.TestStep{
			resource.TestStep{
				Config: testAccDataSourceAwsSubnetConfig(rInt),
				Check: resource.ComposeTestCheckFunc(
					testAccDataSourceAwsSubnetCheck("data.aws_subnet.by_id", rInt),
					testAccDataSourceAwsSubnetCheck("data.aws_subnet.by_cidr", rInt),
					testAccDataSourceAwsSubnetCheck("data.aws_subnet.by_tag", rInt),
					testAccDataSourceAwsSubnetCheck("data.aws_subnet.by_vpc", rInt),
					testAccDataSourceAwsSubnetCheck("data.aws_subnet.by_filter", rInt),
				),
			},
		},
	})
}

func testAccDataSourceAwsSubnetCheck(name string, rInt int) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, ok := s.RootModule().Resources[name]
		if !ok {
			return fmt.Errorf("root module has no resource called %s", name)
		}

		vpcRs, ok := s.RootModule().Resources["aws_vpc.test"]
		if !ok {
			return fmt.Errorf("can't find aws_vpc.test in state")
		}
		subnetRs, ok := s.RootModule().Resources["aws_subnet.test"]
		if !ok {
			return fmt.Errorf("can't find aws_subnet.test in state")
		}

		attr := rs.Primary.Attributes

		if attr["id"] != subnetRs.Primary.Attributes["id"] {
			return fmt.Errorf(
				"id is %s; want %s",
				attr["id"],
				subnetRs.Primary.Attributes["id"],
			)
		}

		if attr["vpc_id"] != vpcRs.Primary.Attributes["id"] {
			return fmt.Errorf(
				"vpc_id is %s; want %s",
				attr["vpc_id"],
				vpcRs.Primary.Attributes["id"],
			)
		}

		if attr["cidr_block"] != fmt.Sprintf("172.%d.123.0/24", rInt) {
			return fmt.Errorf("bad cidr_block %s", attr["cidr_block"])
		}
		if attr["availability_zone"] != "us-west-2a" {
			return fmt.Errorf("bad availability_zone %s", attr["availability_zone"])
		}
		if attr["tags.Name"] != fmt.Sprintf("terraform-testacc-subnet-data-source-%d", rInt) {
			return fmt.Errorf("bad Name tag %s", attr["tags.Name"])
		}

		return nil
	}
}

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

		resource "aws_vpc" "test" {
		  cidr_block = "172.%d.0.0/16"

		  tags {
		    Name = "terraform-testacc-subnet-data-source"
		  }
		}

		resource "aws_subnet" "test" {
		  vpc_id            = "${aws_vpc.test.id}"
		  cidr_block        = "172.%d.123.0/24"
		  availability_zone = "us-west-2a"

		  tags {
		    Name = "terraform-testacc-subnet-data-source-%d"
		  }
		}

		data "aws_subnet" "by_id" {
		  id = "${aws_subnet.test.id}"
		}

		data "aws_subnet" "by_cidr" {
		  cidr_block = "${aws_subnet.test.cidr_block}"
		}

		data "aws_subnet" "by_tag" {
		  tags {
		    Name = "${aws_subnet.test.tags["Name"]}"
		  }
		}

		data "aws_subnet" "by_vpc" {
		  vpc_id = "${aws_subnet.test.vpc_id}"
		}

		data "aws_subnet" "by_filter" {
		  filter {
		    name = "vpc-id"
		    values = ["${aws_subnet.test.vpc_id}"]
		  }
		}
		`, rInt, rInt, rInt)
}