package ec2_test

import (
	"fmt"
	"strings"
	"testing"

	"github.com/aws/aws-sdk-go/service/ec2"
	sdkacctest "github.com/hashicorp/terraform-plugin-sdk/v2/helper/acctest"
	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
	"github.com/hashicorp/terraform-provider-aws/internal/acctest"
	"github.com/hashicorp/terraform-provider-aws/internal/conns"
	tfec2 "github.com/hashicorp/terraform-provider-aws/internal/service/ec2"
	"github.com/hashicorp/terraform-provider-aws/internal/tfresource"
)

func testAccClientVPNAuthorizationRule_basic(t *testing.T) {
	var v ec2.AuthorizationRule
	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
	resourceName := "aws_ec2_client_vpn_authorization_rule.test"
	subnetResourceName := "aws_subnet.test.0"

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheckClientVPNSyncronize(t); acctest.PreCheck(t) },
		ErrorCheck:        acctest.ErrorCheck(t, ec2.EndpointsID),
		ProviderFactories: acctest.ProviderFactories,
		CheckDestroy:      testAccCheckClientVPNAuthorizationRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccClientVPNAuthorizationRuleConfig_basic(rName),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resourceName, &v),
					resource.TestCheckResourceAttrPair(resourceName, "target_network_cidr", subnetResourceName, "cidr_block"),
					resource.TestCheckResourceAttr(resourceName, "authorize_all_groups", "true"),
					resource.TestCheckResourceAttr(resourceName, "access_group_id", ""),
				),
			},
			{
				ResourceName:      resourceName,
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func testAccClientVPNAuthorizationRule_disappears(t *testing.T) {
	var v ec2.AuthorizationRule
	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
	resourceName := "aws_ec2_client_vpn_authorization_rule.test"

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheckClientVPNSyncronize(t); acctest.PreCheck(t) },
		ErrorCheck:        acctest.ErrorCheck(t, ec2.EndpointsID),
		ProviderFactories: acctest.ProviderFactories,
		CheckDestroy:      testAccCheckClientVPNAuthorizationRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccClientVPNAuthorizationRuleConfig_basic(rName),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resourceName, &v),
					acctest.CheckResourceDisappears(acctest.Provider, tfec2.ResourceClientVPNAuthorizationRule(), resourceName),
				),
				ExpectNonEmptyPlan: true,
			},
		},
	})
}

func testAccClientVPNAuthorizationRule_Disappears_endpoint(t *testing.T) {
	var v ec2.AuthorizationRule
	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
	resourceName := "aws_ec2_client_vpn_authorization_rule.test"

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheckClientVPNSyncronize(t); acctest.PreCheck(t) },
		ErrorCheck:        acctest.ErrorCheck(t, ec2.EndpointsID),
		ProviderFactories: acctest.ProviderFactories,
		CheckDestroy:      testAccCheckClientVPNAuthorizationRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccClientVPNAuthorizationRuleConfig_basic(rName),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resourceName, &v),
					acctest.CheckResourceDisappears(acctest.Provider, tfec2.ResourceClientVPNEndpoint(), "aws_ec2_client_vpn_endpoint.test"),
				),
				ExpectNonEmptyPlan: true,
			},
		},
	})
}

func testAccClientVPNAuthorizationRule_groups(t *testing.T) {
	var v ec2.AuthorizationRule
	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
	resource1Name := "aws_ec2_client_vpn_authorization_rule.test1"
	resource2Name := "aws_ec2_client_vpn_authorization_rule.test2"
	subnetResourceName := "aws_subnet.test.0"

	group1Name := "group_one"
	group2Name := "group_two"

	groups1 := map[string]string{
		"test1": group1Name,
	}
	groups2 := map[string]string{
		"test1": group1Name,
		"test2": group2Name,
	}
	groups3 := map[string]string{
		"test2": group2Name,
	}

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheckClientVPNSyncronize(t); acctest.PreCheck(t) },
		ErrorCheck:        acctest.ErrorCheck(t, ec2.EndpointsID),
		ProviderFactories: acctest.ProviderFactories,
		CheckDestroy:      testAccCheckClientVPNAuthorizationRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccClientVPNAuthorizationRuleConfig_groups(rName, groups1),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resource1Name, &v),
					resource.TestCheckResourceAttrPair(resource1Name, "target_network_cidr", subnetResourceName, "cidr_block"),
					resource.TestCheckResourceAttr(resource1Name, "authorize_all_groups", "false"),
					resource.TestCheckResourceAttr(resource1Name, "access_group_id", group1Name),
				),
			},
			{
				ResourceName:      resource1Name,
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				Config: testAccClientVPNAuthorizationRuleConfig_groups(rName, groups2),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resource1Name, &v),
					resource.TestCheckResourceAttrPair(resource1Name, "target_network_cidr", subnetResourceName, "cidr_block"),
					resource.TestCheckResourceAttr(resource1Name, "authorize_all_groups", "false"),
					resource.TestCheckResourceAttr(resource1Name, "access_group_id", group1Name),

					testAccCheckClientVPNAuthorizationRuleExists(resource2Name, &v),
					resource.TestCheckResourceAttrPair(resource2Name, "target_network_cidr", subnetResourceName, "cidr_block"),
					resource.TestCheckResourceAttr(resource2Name, "authorize_all_groups", "false"),
					resource.TestCheckResourceAttr(resource2Name, "access_group_id", group2Name),
				),
			},
			{
				ResourceName:      resource2Name,
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				Config: testAccClientVPNAuthorizationRuleConfig_groups(rName, groups3),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resource2Name, &v),
					resource.TestCheckResourceAttrPair(resource2Name, "target_network_cidr", subnetResourceName, "cidr_block"),
					resource.TestCheckResourceAttr(resource2Name, "authorize_all_groups", "false"),
					resource.TestCheckResourceAttr(resource2Name, "access_group_id", group2Name),
				),
			},
		},
	})
}

func testAccClientVPNAuthorizationRule_subnets(t *testing.T) {
	var v ec2.AuthorizationRule
	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
	resource1Name := "aws_ec2_client_vpn_authorization_rule.test1"
	resource2Name := "aws_ec2_client_vpn_authorization_rule.test2"

	subnetCount := 2

	subnetIndex1 := 0
	subnetIndex2 := 1

	case1 := map[string]int{
		"test1": subnetIndex1,
		"test2": subnetIndex2,
	}
	case2 := map[string]int{
		"test2": subnetIndex2,
	}

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheckClientVPNSyncronize(t); acctest.PreCheck(t) },
		ErrorCheck:        acctest.ErrorCheck(t, ec2.EndpointsID),
		ProviderFactories: acctest.ProviderFactories,
		CheckDestroy:      testAccCheckClientVPNAuthorizationRuleDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccClientVPNAuthorizationRuleConfig_subnets(rName, subnetCount, case1),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resource1Name, &v),
					resource.TestCheckResourceAttrPair(resource1Name, "target_network_cidr", fmt.Sprintf("aws_subnet.test.%d", subnetIndex1), "cidr_block"),
					resource.TestCheckResourceAttr(resource1Name, "authorize_all_groups", "true"),
					resource.TestCheckResourceAttr(resource1Name, "access_group_id", ""),

					testAccCheckClientVPNAuthorizationRuleExists(resource2Name, &v),
					resource.TestCheckResourceAttrPair(resource2Name, "target_network_cidr", fmt.Sprintf("aws_subnet.test.%d", subnetIndex2), "cidr_block"),
					resource.TestCheckResourceAttr(resource2Name, "authorize_all_groups", "true"),
					resource.TestCheckResourceAttr(resource2Name, "access_group_id", ""),
				),
			},
			{
				ResourceName:      resource2Name,
				ImportState:       true,
				ImportStateVerify: true,
			},
			{
				Config: testAccClientVPNAuthorizationRuleConfig_subnets(rName, subnetCount, case2),
				Check: resource.ComposeTestCheckFunc(
					testAccCheckClientVPNAuthorizationRuleExists(resource2Name, &v),
					resource.TestCheckResourceAttrPair(resource2Name, "target_network_cidr", fmt.Sprintf("aws_subnet.test.%d", subnetIndex2), "cidr_block"),
					resource.TestCheckResourceAttr(resource2Name, "authorize_all_groups", "true"),
					resource.TestCheckResourceAttr(resource2Name, "access_group_id", ""),
				),
			},
		},
	})
}

func testAccCheckClientVPNAuthorizationRuleDestroy(s *terraform.State) error {
	conn := acctest.Provider.Meta().(*conns.AWSClient).EC2Conn

	for _, rs := range s.RootModule().Resources {
		if rs.Type != "aws_ec2_client_vpn_authorization_rule" {
			continue
		}

		endpointID, targetNetworkCIDR, accessGroupID, err := tfec2.ClientVPNAuthorizationRuleParseResourceID(rs.Primary.ID)

		if err != nil {
			return err
		}

		_, err = tfec2.FindClientVPNAuthorizationRuleByThreePartKey(conn, endpointID, targetNetworkCIDR, accessGroupID)

		if tfresource.NotFound(err) {
			continue
		}

		if err != nil {
			return err
		}

		return fmt.Errorf("EC2 Client VPN Authorization Rule %s still exists", rs.Primary.ID)
	}

	return nil
}

func testAccCheckClientVPNAuthorizationRuleExists(name string, v *ec2.AuthorizationRule) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, ok := s.RootModule().Resources[name]
		if !ok {
			return fmt.Errorf("Not found: %s", name)
		}

		if rs.Primary.ID == "" {
			return fmt.Errorf("No EC2 Client VPN Authorization Rule ID is set")
		}

		endpointID, targetNetworkCIDR, accessGroupID, err := tfec2.ClientVPNAuthorizationRuleParseResourceID(rs.Primary.ID)

		if err != nil {
			return err
		}

		conn := acctest.Provider.Meta().(*conns.AWSClient).EC2Conn

		output, err := tfec2.FindClientVPNAuthorizationRuleByThreePartKey(conn, endpointID, targetNetworkCIDR, accessGroupID)

		if err != nil {
			return err
		}

		*v = *output

		return nil
	}
}

func testAccClientVPNAuthorizationRuleConfig_base(rName string, subnetCount int) string {
	return acctest.ConfigCompose(
		testAccClientVPNEndpointConfig_basic(rName),
		acctest.ConfigAvailableAZsNoOptInDefaultExclude(),
		fmt.Sprintf(`
resource "aws_vpc" "test" {
  cidr_block = "10.1.0.0/16"

  tags = {
    Name = %[1]q
  }
}

resource "aws_subnet" "test" {
  count                   = %[2]d
  availability_zone       = data.aws_availability_zones.available.names[count.index]
  cidr_block              = cidrsubnet(aws_vpc.test.cidr_block, 8, count.index)
  vpc_id                  = aws_vpc.test.id
  map_public_ip_on_launch = true

  tags = {
    Name = %[1]q
  }
}
`, rName, subnetCount))
}

func testAccClientVPNAuthorizationRuleConfig_basic(rName string) string {
	return acctest.ConfigCompose(testAccClientVPNAuthorizationRuleConfig_base(rName, 1), `
resource "aws_ec2_client_vpn_authorization_rule" "test" {
  client_vpn_endpoint_id = aws_ec2_client_vpn_endpoint.test.id
  target_network_cidr    = aws_subnet.test[0].cidr_block
  authorize_all_groups   = true
}
`)
}

func testAccClientVPNAuthorizationRuleConfig_groups(rName string, groupNames map[string]string) string {
	var b strings.Builder
	for k, v := range groupNames {
		fmt.Fprintf(&b, `
resource "aws_ec2_client_vpn_authorization_rule" %[1]q {
  client_vpn_endpoint_id = aws_ec2_client_vpn_endpoint.test.id
  target_network_cidr    = aws_subnet.test[0].cidr_block
  access_group_id        = %[2]q
}
`, k, v)
	}

	return acctest.ConfigCompose(testAccClientVPNAuthorizationRuleConfig_base(rName, 1), b.String())
}

func testAccClientVPNAuthorizationRuleConfig_subnets(rName string, subnetCount int, groupNames map[string]int) string {
	var b strings.Builder
	for k, v := range groupNames {
		fmt.Fprintf(&b, `
resource "aws_ec2_client_vpn_authorization_rule" %[1]q {
  client_vpn_endpoint_id = aws_ec2_client_vpn_endpoint.test.id
  target_network_cidr    = aws_subnet.test[%[2]d].cidr_block
  authorize_all_groups   = true
}
`, k, v)
	}

	return acctest.ConfigCompose(testAccClientVPNAuthorizationRuleConfig_base(rName, subnetCount), b.String())
}
