package hostess_test

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net"
	"path/filepath"
	"testing"

	"github.com/cbednarski/hostess/hostess"
)

func TestAddDuplicate(t *testing.T) {
	list := hostess.NewHostlist()

	hostname := hostess.MustHostname("mysite", "1.2.3.4", false)
	if err := list.Add(hostname); err != nil {
		t.Error(err)
	}

	hostname.Enabled = true
	if err := list.Add(hostname); err == nil {
		t.Error("Expected error because of duplicate entry")
	}

	if !(*list)[0].Enabled {
		t.Error("Expected hostname to be in enabled state")
	}
}

func TestAddConflict(t *testing.T) {
	hostnameA := hostess.MustHostname("mysite", "1.2.3.4", true)
	hostnameB := hostess.MustHostname("mysite", "5.2.3.4", false)

	list := hostess.NewHostlist()
	list.Add(hostnameA)
	if err := list.Add(hostnameB); err == nil {
		t.Errorf("Expected conflict error")
	}

	if !(*list)[0].Equal(hostnameB) {
		t.Error("Expected second hostname to overwrite")
	}
	if (*list)[0].Enabled {
		t.Error("Expected second hostname to be disabled")
	}
}

func TestMakeSurrogateIP(t *testing.T) {
	original := net.ParseIP("127.0.0.1")
	expected1 := net.ParseIP("0.0.0.1")
	IP1 := hostess.MakeSurrogateIP(original)
	if !IP1.Equal(expected1) {
		t.Errorf("Expected %s to convert to %s; got %s", original, expected1, IP1)
	}

	expected2 := net.ParseIP("10.20.30.40")
	IP2 := hostess.MakeSurrogateIP(expected2)
	if !IP2.Equal(expected2) {
		t.Errorf("Expected %s to remain unchanged; got %s", expected2, IP2)
	}
}

func TestContainsDomainIp(t *testing.T) {
	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname(domain, ip, false))
	hosts.Add(hostess.MustHostname("google.com", "8.8.8.8", true))

	if !hosts.ContainsDomain(domain) {
		t.Errorf("Expected to find %s", domain)
	}

	const extraneousDomain = "yahoo.com"
	if hosts.ContainsDomain(extraneousDomain) {
		t.Errorf("Did not expect to find %s", extraneousDomain)
	}

	var expectedIP = net.ParseIP(ip)
	if !hosts.ContainsIP(expectedIP) {
		t.Errorf("Expected to find %s", ip)
	}

	var extraneousIP = net.ParseIP("1.2.3.4")
	if hosts.ContainsIP(extraneousIP) {
		t.Errorf("Did not expect to find %s", extraneousIP)
	}

	expectedHostname := hostess.MustHostname(domain, ip, true)
	if !hosts.Contains(expectedHostname) {
		t.Errorf("Expected to find %+v", expectedHostname)
	}

	extraneousHostname := hostess.MustHostname("yahoo.com", "4.3.2.1", false)
	if hosts.Contains(extraneousHostname) {
		t.Errorf("Did not expect to find %+v", extraneousHostname)
	}
}

func TestFormatLinux(t *testing.T) {
	hostfile := hostess.NewHostfile()
	hostfile.Path = filepath.Join("testdata", "hostfile3")
	if err := hostfile.Read(); err != nil {
		t.Fatal(err)
	}
	if errs := hostfile.Parse(); len(errs) != 0 {
		t.Fatal(errs)
	}

	expected, err := ioutil.ReadFile(filepath.Join("testdata", "expected-linux"))
	if err != nil {
		t.Fatal(err)
	}

	output := hostfile.Hosts.FormatLinux()

	if !bytes.Equal(output, expected) {
		t.Error(Diff(string(expected), string(output)))
	}
}

func TestFormatWindows(t *testing.T) {
	hostfile := hostess.NewHostfile()
	hostfile.Path = filepath.Join("testdata", "hostfile3")
	if err := hostfile.Read(); err != nil {
		t.Fatal(err)
	}
	if errs := hostfile.Parse(); len(errs) != 0 {
		t.Fatal(errs)
	}

	expected, err := ioutil.ReadFile(filepath.Join("testdata", "expected-windows"))
	if err != nil {
		t.Fatal(err)
	}

	output := hostfile.Hosts.FormatWindows()

	if !bytes.Equal(output, expected) {
		t.Error(Diff(string(expected), string(output)))
	}
}

func TestFormat(t *testing.T) {
	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname(domain, ip, false))
	hosts.Add(hostess.MustHostname("google.com", "8.8.8.8", true))

	expected := `# 127.0.0.1 localhost
8.8.8.8 google.com
`
	if string(hosts.Format()) != expected {
		t.Error("Formatted hosts list is not formatted correctly")
	}
}

func TestRemove(t *testing.T) {
	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname(domain, ip, false))
	hosts.Add(hostess.MustHostname("google.com", "8.8.8.8", true))

	removed := hosts.Remove(1)
	if removed != 1 {
		t.Error("Expected to remove 1 item")
	}
	if len(*hosts) > 1 {
		t.Errorf("Expected hostlist to have 1 item, found %d", len(*hosts))
	}
	if hosts.ContainsDomain("google.com") {
		t.Errorf("Expected not to find google.com")
	}

	hosts.Add(hostess.MustHostname(domain, "::1", enabled))
	removed = hosts.RemoveDomain(domain)
	if removed != 2 {
		t.Error("Expected to remove 2 items")
	}
}

func TestRemoveDomain(t *testing.T) {
	hosts := hostess.NewHostlist()
	h1 := hostess.MustHostname("google.com", "127.0.0.1", false)
	h2 := hostess.MustHostname("google.com", "::1", true)
	hosts.Add(h1)
	hosts.Add(h2)

	hosts.RemoveDomainV("google.com", 4)
	if hosts.Contains(h1) {
		t.Error("Should not contain ipv4 hostname")
	}
	if !hosts.Contains(h2) {
		t.Error("Should still contain ipv6 hostname")
	}

	hosts.RemoveDomainV("google.com", 6)
	if len(*hosts) != 0 {
		t.Error("Should no longer contain any hostnames")
	}
}

func CheckIndexDomain(t *testing.T, index int, domain string, hosts *hostess.Hostlist) {
	if (*hosts)[index].Domain != domain {
		t.Errorf("Expected %s to be in position %d. Found: %s", domain, index, (*hosts)[index].FormatHuman())
	}
}

func TestSort(t *testing.T) {
	// Getting 100% coverage on this is kinda tricky. It's pretty close and
	// this is already too long.

	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname("google.com", "8.8.8.8", true))
	hosts.Add(hostess.MustHostname("google3.com", "::1", true))
	hosts.Add(hostess.MustHostname(domain, ip, false))
	hosts.Add(hostess.MustHostname("google2.com", "8.8.4.4", true))
	hosts.Add(hostess.MustHostname("blah2", "10.20.1.1", true))
	hosts.Add(hostess.MustHostname("blah3", "10.20.1.1", true))
	hosts.Add(hostess.MustHostname("blah33", "10.20.1.1", true))
	hosts.Add(hostess.MustHostname("blah", "10.20.1.1", true))
	hosts.Add(hostess.MustHostname("hostname", "127.0.1.1", true))
	hosts.Add(hostess.MustHostname("devsite", "127.0.0.1", true))

	hosts.Sort()

	CheckIndexDomain(t, 0, "localhost", hosts)
	CheckIndexDomain(t, 1, "devsite", hosts)
	CheckIndexDomain(t, 2, "hostname", hosts)
	CheckIndexDomain(t, 3, "google2.com", hosts)
	CheckIndexDomain(t, 4, "google.com", hosts)
	CheckIndexDomain(t, 5, "blah", hosts)
	CheckIndexDomain(t, 6, "blah2", hosts)
	CheckIndexDomain(t, 7, "blah3", hosts)
	CheckIndexDomain(t, 8, "blah33", hosts)
	CheckIndexDomain(t, 9, "google3.com", hosts)
}

func ExampleHostlist() {
	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname("google.com", "127.0.0.1", false))
	hosts.Add(hostess.MustHostname("google.com", "::1", true))

	fmt.Printf("%s\n", hosts.Format())
	// Output:
	// # 127.0.0.1 google.com
	// ::1 google.com
}

const hostsjson = `[
  {
    "domain": "google.com",
    "ip": "127.0.0.1",
    "enabled": false
  },
  {
    "domain": "google.com",
    "ip": "::1",
    "enabled": true
  }
]`

func TestDump(t *testing.T) {
	hosts := hostess.NewHostlist()
	hosts.Add(hostess.MustHostname("google.com", "127.0.0.1", false))
	hosts.Add(hostess.MustHostname("google.com", "::1", true))

	expected := []byte(hostsjson)
	actual, _ := hosts.Dump()

	if !bytes.Equal(actual, expected) {
		t.Errorf("JSON output did not match expected output: %s", Diff(string(expected), string(actual)))
	}

}

func TestApply(t *testing.T) {
	hosts := hostess.NewHostlist()
	hosts.Apply([]byte(hostsjson))

	hostnameA := hostess.MustHostname("google.com", "127.0.0.1", false)
	if !hosts.Contains(hostnameA) {
		t.Errorf("Expected to find %s", hostnameA.Format())
	}

	hostnameB := hostess.MustHostname("google.com", "::1", true)
	if !hosts.Contains(hostnameB) {
		t.Errorf("Expected to find %s", hostnameB.Format())
	}

	hosts.Apply([]byte(hostsjson))
	if hosts.Len() != 2 {
		t.Error("Hostslist contains the wrong number of items, expected 2")
	}
}