package discoveryutil

import (
	"fmt"
	"testing"
	"time"
)

func TestJoinHostPort(t *testing.T) {
	f := func(host string, port int, resultExpected string) {
		t.Helper()
		for i := 0; i < 5; i++ {
			result := JoinHostPort(host, port)
			if result != resultExpected {
				t.Fatalf("unexpected result for JoinHostPort(%q, %d); got %q; want %q", host, port, result, resultExpected)
			}
		}
	}
	f("foo", 123, "foo:123")
	f("1:32::43", 80, "[1:32::43]:80")
}

func TestSanitizeLabelNameSerial(t *testing.T) {
	if err := testSanitizeLabelName(); err != nil {
		t.Fatalf("unexpected error: %s", err)
	}
}

func TestSanitizeLabelNameParallel(t *testing.T) {
	goroutines := 5
	ch := make(chan error, goroutines)
	for i := 0; i < goroutines; i++ {
		go func() {
			ch <- testSanitizeLabelName()
		}()
	}
	tch := time.After(5 * time.Second)
	for i := 0; i < goroutines; i++ {
		select {
		case <-tch:
			t.Fatalf("timeout!")
		case err := <-ch:
			if err != nil {
				t.Fatalf("unexpected error: %s", err)
			}
		}
	}
}

func testSanitizeLabelName() error {
	f := func(name, expectedSanitizedName string) error {
		for i := 0; i < 5; i++ {
			sanitizedName := SanitizeLabelName(name)
			if sanitizedName != expectedSanitizedName {
				return fmt.Errorf("unexpected sanitized label name %q; got %q; want %q", name, sanitizedName, expectedSanitizedName)
			}
		}
		return nil
	}
	if err := f("", ""); err != nil {
		return err
	}
	if err := f("foo", "foo"); err != nil {
		return err
	}
	return f("foo-bar/baz", "foo_bar_baz")
}

func TestIsIPv6Host(t *testing.T) {
	f := func(host string, isIPv6Expected bool) {
		t.Helper()
		isIPv6 := IsIPv6Host(host)
		if isIPv6 != isIPv6Expected {
			t.Fatalf("unexpected result for IsIPv6Host(%q); got %v; want %v", host, isIPv6, isIPv6Expected)
		}
	}
	f("foo", false)
	f("1:32::43", true)
}

func TestEscapeIPv6Host(t *testing.T) {
	f := func(host string, escapedHostExpected string) {
		t.Helper()
		escapedHost := EscapeIPv6Host(host)
		if escapedHost != escapedHostExpected {
			t.Fatalf("unexpected result for EscapeIPv6Host(%q); got %q; want %q", host, escapedHost, escapedHostExpected)
		}
	}
	f("1:32::43", "[1:32::43]")
}