package main

import (
	"bytes"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"

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

// CopyHostsFile creates a temporary hosts file in the system temp directory,
// sets the HOSTESS_PATH environment variable, and returns the file path and a
// cleanup function
func CopyHostsFile(t *testing.T, fixtureFiles ...string) (string, func()) {
	t.Helper()

	fixtureFile := filepath.Join("testdata", "ubuntu.hosts")

	// This is an optional argument so we'll default to the ubuntu.hosts above
	// and only accept arity 1 if the user passes in extra data
	if len(fixtureFiles) > 1 {
		t.Fatalf("%s supplied too many arguments to CopyHostsFile", t.Name())
	} else if len(fixtureFiles) == 1 {
		fixtureFile = fixtureFiles[0]
	}

	fixture, err := os.Open(fixtureFile)
	if err != nil {
		t.Fatal(err)
	}

	temp, err := ioutil.TempFile("", "hostess-test-*")
	if err != nil {
		t.Fatal(err)
	}

	if _, err := io.Copy(temp, fixture); err != nil {
		t.Fatal(err)
	}

	if err := os.Setenv(hostess.EnvHostessPath, temp.Name()); err != nil {
		t.Fatal(err)
	}

	cleanup := func() {
		os.Remove(temp.Name())
		os.Unsetenv(hostess.EnvHostessPath)
	}

	return temp.Name(), cleanup
}

func TestFormat(t *testing.T) {
	temp, cleanup := CopyHostsFile(t)
	defer cleanup()

	if err := wrappedMain(strings.Split("hostess fmt", " ")); err != nil {
		t.Fatal(err)
	}

	data, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}
	output := string(data)

	expected := `127.0.0.1 localhost myapp.local
127.0.1.1 ubuntu
192.168.0.30 raspberrypi
::1 ip6-localhost ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`

	if runtime.GOOS == "windows" {
		expected = `127.0.0.1 localhost
127.0.0.1 myapp.local
127.0.1.1 ubuntu
192.168.0.30 raspberrypi
::1 ip6-localhost
::1 ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`
	}

	if output != expected {
		t.Errorf("--- Expected ---\n%s\n--- Found ---\n%s\n", expected, output)
	}
}

func TestAddHostname(t *testing.T) {
	temp, cleanup := CopyHostsFile(t)
	defer cleanup()

	if err := wrappedMain(strings.Split("hostess add my.new.website 127.0.0.1", " ")); err != nil {
		t.Fatal(err)
	}
	if err := wrappedMain(strings.Split("hostess add mediaserver 192.168.0.82", " ")); err != nil {
		t.Fatal(err)
	}
	if err := wrappedMain(strings.Split("hostess add myapp.local 10.20.0.23", " ")); err != nil {
		t.Fatal(err)
	}

	data, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}
	output := string(data)

	expected := `127.0.0.1 localhost my.new.website
127.0.1.1 ubuntu
10.20.0.23 myapp.local
192.168.0.30 raspberrypi
192.168.0.82 mediaserver
::1 ip6-localhost ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`

	if runtime.GOOS == "windows" {
		expected = `127.0.0.1 localhost
127.0.0.1 my.new.website
127.0.1.1 ubuntu
10.20.0.23 myapp.local
192.168.0.30 raspberrypi
192.168.0.82 mediaserver
::1 ip6-localhost
::1 ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`
	}

	if output != expected {
		t.Errorf("--- Expected ---\n%s\n--- Found ---\n%s\n", expected, output)
	}
}

func TestRemoveHostname(t *testing.T) {
	temp, cleanup := CopyHostsFile(t)
	defer cleanup()

	if err := wrappedMain(strings.Split("hostess rm myapp.local", " ")); err != nil {
		t.Fatal(err)
	}
	if err := wrappedMain(strings.Split("hostess rm raspberrypi", " ")); err != nil {
		t.Fatal(err)
	}

	data, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}
	output := string(data)

	expected := `127.0.0.1 localhost
127.0.1.1 ubuntu
::1 ip6-localhost ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`

	if runtime.GOOS == "windows" {
		expected = `127.0.0.1 localhost
127.0.1.1 ubuntu
::1 ip6-localhost
::1 ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`
	}

	if output != expected {
		t.Errorf("--- Expected ---\n%s\n--- Found ---\n%s\n", expected, output)
	}
}

func TestHostnameOff(t *testing.T) {
	temp, cleanup := CopyHostsFile(t)
	defer cleanup()

	if err := wrappedMain(strings.Split("hostess off myapp.local", " ")); err != nil {
		t.Fatal(err)
	}
	if err := wrappedMain(strings.Split("hostess off raspberrypi", " ")); err != nil {
		t.Fatal(err)
	}

	data, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}
	output := string(data)

	expected := `127.0.0.1 localhost
# 127.0.0.1 myapp.local
127.0.1.1 ubuntu
# 192.168.0.30 raspberrypi
::1 ip6-localhost ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`

	if runtime.GOOS == "windows" {
		expected = `127.0.0.1 localhost
# 127.0.0.1 myapp.local
127.0.1.1 ubuntu
# 192.168.0.30 raspberrypi
::1 ip6-localhost
::1 ip6-loopback
fe00:: ip6-localnet
ff00:: ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`
	}

	if output != expected {
		t.Errorf("--- Expected ---\n%s\n--- Found ---\n%s\n", expected, output)
	}
}

func TestExitCodeFmt(t *testing.T) {
	temp, cleanup := CopyHostsFile(t, filepath.Join("testdata", "issue39"))
	defer cleanup()

	state1, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}

	t.Logf("%s", state1)

	if err := wrappedMain([]string{"hostess", "fmt", "-n"}); err != ErrParsingHostsFile {
		t.Fatalf(`Expected %q, found %v`, ErrParsingHostsFile, err)
	}

	state2, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(state1, state2) {
		t.Error("Expected hosts contents before and after fix -n to be the same")
	}

	if err := wrappedMain([]string{"hostess", "fmt"}); err != nil {
		t.Fatalf("Unexpected error: %s", err)
	}

	finalExpected := `127.0.0.1 localhost kubernetes.docker.internal
::1 localhost
`

	state3, err := ioutil.ReadFile(temp)
	if err != nil {
		t.Fatal(err)
	}

	if string(state3) != finalExpected {
		t.Fatalf("---- Expected ----\n%s\n---- Found ----\n%s\n", finalExpected, string(state3))
	}
}