package aws

import (
	"fmt"
	"testing"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/ec2"

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

func TestAccAWSVpnConnection_basic(t *testing.T) {
	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccAwsVpnConnectionDestroy,
		Steps: []resource.TestStep{
			resource.TestStep{
				Config: testAccAwsVpnConnectionConfig,
				Check: resource.ComposeTestCheckFunc(
					testAccAwsVpnConnection(
						"aws_vpc.vpc",
						"aws_vpn_gateway.vpn_gateway",
						"aws_customer_gateway.customer_gateway",
						"aws_vpn_connection.foo",
					),
				),
			},
			resource.TestStep{
				Config: testAccAwsVpnConnectionConfigUpdate,
				Check: resource.ComposeTestCheckFunc(
					testAccAwsVpnConnection(
						"aws_vpc.vpc",
						"aws_vpn_gateway.vpn_gateway",
						"aws_customer_gateway.customer_gateway",
						"aws_vpn_connection.foo",
					),
				),
			},
		},
	})
}

func testAccAwsVpnConnectionDestroy(s *terraform.State) error {
	conn := testAccProvider.Meta().(*AWSClient).ec2conn
	for _, rs := range s.RootModule().Resources {
		if rs.Type != "aws_vpn_connection" {
			continue
		}

		resp, err := conn.DescribeVpnConnections(&ec2.DescribeVpnConnectionsInput{
			VpnConnectionIds: []*string{aws.String(rs.Primary.ID)},
		})

		if err != nil {
			if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidVpnConnectionID.NotFound" {
				// not found
				return nil
			}
			return err
		}

		var vpn *ec2.VpnConnection
		for _, v := range resp.VpnConnections {
			if v.VpnConnectionId != nil && *v.VpnConnectionId == rs.Primary.ID {
				vpn = v
			}
		}

		if vpn == nil {
			// vpn connection not found
			return nil
		}

		if vpn.State != nil && *vpn.State == "deleted" {
			return nil
		}

	}

	return nil
}

func testAccAwsVpnConnection(
	vpcResource string,
	vpnGatewayResource string,
	customerGatewayResource string,
	vpnConnectionResource string) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, ok := s.RootModule().Resources[vpnConnectionResource]
		if !ok {
			return fmt.Errorf("Not found: %s", vpnConnectionResource)
		}

		if rs.Primary.ID == "" {
			return fmt.Errorf("No ID is set")
		}
		connection, ok := s.RootModule().Resources[vpnConnectionResource]
		if !ok {
			return fmt.Errorf("Not found: %s", vpnConnectionResource)
		}

		ec2conn := testAccProvider.Meta().(*AWSClient).ec2conn

		_, err := ec2conn.DescribeVpnConnections(&ec2.DescribeVpnConnectionsInput{
			VpnConnectionIds: []*string{aws.String(connection.Primary.ID)},
		})

		if err != nil {
			return err
		}

		return nil
	}
}

func TestAWSVpnConnection_xmlconfig(t *testing.T) {
	tunnelInfo := xmlConfigToTunnelInfo(testAccAwsVpnTunnelInfoXML)
	if tunnelInfo.Tunnel1Address != "FIRST_ADDRESS" {
		t.Fatalf("First address from tunnel XML was incorrect.")
	}
	if tunnelInfo.Tunnel1PreSharedKey != "FIRST_KEY" {
		t.Fatalf("First key from tunnel XML was incorrect.")
	}
	if tunnelInfo.Tunnel2Address != "SECOND_ADDRESS" {
		t.Fatalf("Second address from tunnel XML was incorrect.")
	}
	if tunnelInfo.Tunnel2PreSharedKey != "SECOND_KEY" {
		t.Fatalf("Second key from tunnel XML was incorrect.")
	}
}

const testAccAwsVpnConnectionConfig = `
resource "aws_vpn_gateway" "vpn_gateway" {
  tags {
    Name = "vpn_gateway"
  }
}

resource "aws_customer_gateway" "customer_gateway" {
  bgp_asn = 60000
  ip_address = "178.0.0.1"
  type = "ipsec.1"
}

resource "aws_vpn_connection" "foo" {
  vpn_gateway_id = "${aws_vpn_gateway.vpn_gateway.id}"
  customer_gateway_id = "${aws_customer_gateway.customer_gateway.id}"
  type = "ipsec.1"
  static_routes_only = true
}
`

// Change static_routes_only to be false, forcing a refresh.
const testAccAwsVpnConnectionConfigUpdate = `
resource "aws_vpn_gateway" "vpn_gateway" {
  tags {
    Name = "vpn_gateway"
  }
}

resource "aws_customer_gateway" "customer_gateway" {
  bgp_asn = 60000
  ip_address = "178.0.0.1"
  type = "ipsec.1"
}

resource "aws_vpn_connection" "foo" {
  vpn_gateway_id = "${aws_vpn_gateway.vpn_gateway.id}"
  customer_gateway_id = "${aws_customer_gateway.customer_gateway.id}"
  type = "ipsec.1"
  static_routes_only = false
}
`

// Test our VPN tunnel config XML parsing
const testAccAwsVpnTunnelInfoXML = `
<vpn_connection id="vpn-abc123">
  <ipsec_tunnel>
    <vpn_gateway>
      <tunnel_outside_address>
        <ip_address>SECOND_ADDRESS</ip_address>
      </tunnel_outside_address>
    </vpn_gateway>
    <ike>
      <pre_shared_key>SECOND_KEY</pre_shared_key>
    </ike>
  </ipsec_tunnel>
  <ipsec_tunnel>
    <vpn_gateway>
      <tunnel_outside_address>
        <ip_address>FIRST_ADDRESS</ip_address>
      </tunnel_outside_address>
    </vpn_gateway>
    <ike>
      <pre_shared_key>FIRST_KEY</pre_shared_key>
    </ike>
  </ipsec_tunnel>
</vpn_connection>
`