package digitalocean

import (
	"context"
	"fmt"
	"log"
	"strings"
	"testing"

	"github.com/digitalocean/godo"
	"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"
)

func init() {
	resource.AddTestSweepers("digitalocean_firewall", &resource.Sweeper{
		Name: "digitalocean_firewall",
		F:    testSweepFirewall,
	})

}

func testSweepFirewall(region string) error {
	meta, err := sharedConfigForRegion(region)
	if err != nil {
		return err
	}

	client := meta.(*CombinedConfig).godoClient()

	opt := &godo.ListOptions{PerPage: 200}
	fws, _, err := client.Firewalls.List(context.Background(), opt)
	if err != nil {
		return err
	}

	for _, f := range fws {
		if strings.HasPrefix(f.Name, "foobar-") {
			log.Printf("Destroying firewall %s", f.Name)

			if _, err := client.Firewalls.Delete(context.Background(), f.ID); err != nil {
				return err
			}
		}
	}

	return nil
}

func TestAccDigitalOceanFirewall_AllowOnlyInbound(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_OnlyInbound(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "inbound_rule.#", "1"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_AllowMultipleInbound(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_OnlyMultipleInbound(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "inbound_rule.#", "2"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_AllowOnlyOutbound(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_OnlyOutbound(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "outbound_rule.#", "1"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_AllowMultipleOutbound(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_OnlyMultipleOutbound(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "outbound_rule.#", "2"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_MultipleInboundAndOutbound(t *testing.T) {
	rName := acctest.RandString(10)
	tagName := "tag-" + rName
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_MultipleInboundAndOutbound(tagName, rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "inbound_rule.#", "2"),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "outbound_rule.#", "2"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_fullPortRange(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_fullPortRange(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "inbound_rule.#", "1"),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "outbound_rule.#", "1"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_icmp(t *testing.T) {
	rName := acctest.RandString(10)
	var firewall godo.Firewall

	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_icmp(rName),
				Check: resource.ComposeAggregateTestCheckFunc(
					testAccCheckDigitalOceanFirewallExists("digitalocean_firewall.foobar", &firewall),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "inbound_rule.#", "1"),
					resource.TestCheckResourceAttr("digitalocean_firewall.foobar", "outbound_rule.#", "1"),
				),
			},
		},
	})
}

func TestAccDigitalOceanFirewall_ImportMultipleRules(t *testing.T) {
	resourceName := "digitalocean_firewall.foobar"
	rName := acctest.RandString(10)
	tagName := "tag-" + rName
	resource.ParallelTest(t, resource.TestCase{
		PreCheck:          func() { testAccPreCheck(t) },
		ProviderFactories: testAccProviderFactories,
		CheckDestroy:      testAccCheckDigitalOceanFirewallDestroy,
		Steps: []resource.TestStep{
			{
				Config: testAccDigitalOceanFirewallConfig_MultipleInboundAndOutbound(tagName, rName),
			},

			{
				ResourceName:      resourceName,
				ImportState:       true,
				ImportStateVerify: true,
			},
		},
	})
}

func testAccDigitalOceanFirewallConfig_OnlyInbound(rName string) string {
	return fmt.Sprintf(`
	resource "digitalocean_firewall" "foobar" {
				name          = "foobar-%s"
				inbound_rule {
					protocol         = "tcp"
					port_range       = "22"
					source_addresses = ["0.0.0.0/0", "::/0"]
				}

			}
	`, rName)
}

func testAccDigitalOceanFirewallConfig_OnlyOutbound(rName string) string {
	return fmt.Sprintf(`
	resource "digitalocean_firewall" "foobar" {
				name          = "foobar-%s"
				outbound_rule {
					protocol              = "tcp"
					port_range            = "22"
					destination_addresses = ["0.0.0.0/0", "::/0"]
				}

			}
	`, rName)
}

func testAccDigitalOceanFirewallConfig_OnlyMultipleInbound(rName string) string {
	return fmt.Sprintf(`
	resource "digitalocean_firewall" "foobar" {
				name          = "foobar-%s"
				inbound_rule {
					protocol         = "tcp"
					port_range       = "22"
					source_addresses = ["0.0.0.0/0", "::/0"]
				}
				inbound_rule {
					protocol         = "tcp"
					port_range       = "80"
					source_addresses = ["1.2.3.0/24", "2002::/16"]
				}

			}
	`, rName)
}

func testAccDigitalOceanFirewallConfig_OnlyMultipleOutbound(rName string) string {
	return fmt.Sprintf(`
	resource "digitalocean_firewall" "foobar" {
				name          = "foobar-%s"
				outbound_rule {
					protocol              = "tcp"
					port_range            = "22"
					destination_addresses = ["192.168.1.0/24", "2002:1001::/48"]
				}
				outbound_rule {
					protocol              = "udp"
					port_range            = "53"
					destination_addresses = ["1.2.3.0/24", "2002::/16"]
				}

			}
	`, rName)
}

func testAccDigitalOceanFirewallConfig_MultipleInboundAndOutbound(tagName string, rName string) string {
	return fmt.Sprintf(`
	resource "digitalocean_tag" "foobar" {
		name = "%s"
	}

	resource "digitalocean_firewall" "foobar" {
				name          = "foobar-%s"
				inbound_rule {
					protocol         = "tcp"
					port_range       = "22"
					source_addresses = ["0.0.0.0/0", "::/0"]
				}
				inbound_rule {
					protocol         = "tcp"
					port_range       = "443"
					source_addresses = ["192.168.1.0/24", "2002:1001:1:2::/64"]
					source_tags      = ["%s"]
				}
				outbound_rule {
					protocol              = "tcp"
					port_range            = "443"
					destination_addresses = ["192.168.1.0/24", "2002:1001:1:2::/64"]
					destination_tags      = ["%s"]
				}
				outbound_rule {
					protocol              = "udp"
					port_range            = "53"
					destination_addresses = ["0.0.0.0/0", "::/0"]
				}

			}
	`, tagName, rName, tagName, tagName)
}

func testAccDigitalOceanFirewallConfig_fullPortRange(rName string) string {
	return fmt.Sprintf(`
resource "digitalocean_firewall" "foobar" {
	name          = "foobar-%s"
	inbound_rule {
		protocol         = "tcp"
		port_range       = "all"
		source_addresses = ["192.168.1.1/32"]
	}
	outbound_rule {
		protocol              = "tcp"
		port_range            = "all"
		destination_addresses = ["192.168.1.2/32"]
	}
}
`, rName)
}

func testAccDigitalOceanFirewallConfig_icmp(rName string) string {
	return fmt.Sprintf(`
resource "digitalocean_firewall" "foobar" {
	name          = "foobar-%s"
	inbound_rule {
		protocol         = "icmp"
		source_addresses = ["192.168.1.1/32"]
	}
	outbound_rule {
		protocol              = "icmp"
		port_range            = "1-65535"
		destination_addresses = ["192.168.1.2/32"]
	}
}
`, rName)
}

func testAccCheckDigitalOceanFirewallDestroy(s *terraform.State) error {
	client := testAccProvider.Meta().(*CombinedConfig).godoClient()

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

		// Try to find the firewall
		_, _, err := client.Firewalls.Get(context.Background(), rs.Primary.ID)

		if err == nil {
			return fmt.Errorf("Firewall still exists")
		}
	}

	return nil
}

func testAccCheckDigitalOceanFirewallExists(n string, firewall *godo.Firewall) 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 fmt.Errorf("No Record ID is set")
		}

		client := testAccProvider.Meta().(*CombinedConfig).godoClient()

		foundFirewall, _, err := client.Firewalls.Get(context.Background(), rs.Primary.ID)

		if err != nil {
			return err
		}

		if foundFirewall.ID != rs.Primary.ID {
			return fmt.Errorf("Record not found")
		}

		*firewall = *foundFirewall

		return nil
	}
}