package main

import (
	"net"
	"testing"
	"time"
)

func TestATCPPortThatListensIsReachableAndOneThatDoesNotIsNot(t *testing.T) {
	l, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	port := l.Addr().(*net.TCPAddr).Port
	got, err := CheckTCP("127.0.0.1", port, time.Second)
	if err != nil || !got.Reachable || got.Error != "" {
		t.Fatalf("a listening port: %+v, %v", got, err)
	}
	l.Close()
	got, err = CheckTCP("127.0.0.1", port, time.Second)
	if err != nil || got.Reachable || got.Error == "" {
		t.Fatalf("a closed port is reported as a result with its error, not a failure: %+v, %v", got, err)
	}
}

func TestAPortOutsideTheRangeIsRefused(t *testing.T) {
	for _, p := range []int{0, -1, 65536} {
		if _, err := CheckTCP("127.0.0.1", p, time.Second); err == nil {
			t.Errorf("port %d was accepted", p)
		}
	}
}

func TestDNSAnswersFromTheMachinesResolverAndRefusesAnUnknownType(t *testing.T) {
	got, err := CheckDNS("localhost", "a", time.Second)
	if err != nil || got.Type != "A" || len(got.Answers) == 0 {
		t.Fatalf("localhost A: %+v, %v", got, err)
	}
	if _, err := CheckDNS("localhost", "SRV", time.Second); err == nil {
		t.Fatal("an unknown record type was accepted")
	}
	got, err = CheckDNS("no-such-name.invalid", "A", time.Second)
	if err != nil || got.Error == "" || len(got.Answers) != 0 {
		t.Fatalf("a name that does not resolve is a result with its error: %+v, %v", got, err)
	}
}

func TestTimeoutIsDefaultedAndBounded(t *testing.T) {
	if d, _ := timeoutOf(map[string]any{}); d != DefaultTimeout {
		t.Errorf("default: %v", d)
	}
	if d, _ := timeoutOf(map[string]any{"timeout_ms": float64(10 * 60 * 1000)}); d != MostTimeout {
		t.Errorf("bounded: %v", d)
	}
	if _, err := timeoutOf(map[string]any{"timeout_ms": float64(0)}); err == nil {
		t.Error("a zero timeout was accepted")
	}
}

func TestBothToolsAreListedUnprefixed(t *testing.T) {
	names := map[string]bool{}
	for _, tool := range tools() {
		names[tool.Name] = true
	}
	if !names["netcheck_tcp"] || !names["netcheck_dns"] || len(names) != 2 {
		t.Fatalf("tools: %v", names)
	}
}