package netcheck

import (
	"context"
	"net"
	"testing"
	"time"

	"vpnclient/internal/config"
)

func TestFriendlyDialError(t *testing.T) {
	err := &netError{s: "dial tcp 1.2.3.4:22514: connectex: No connection could be made because the target machine actively refused it."}
	got := friendlyDialError(err, true)
	if got == "" || got == err.Error() {
		t.Fatalf("got %q", got)
	}
}

type netError struct{ s string }

func (e *netError) Error() string   { return e.s }
func (e *netError) Timeout() bool   { return false }
func (e *netError) Temporary() bool { return false }

func TestPingProfileEmpty(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()
	r := PingProfile(ctx, "x", config.ProtocolHysteria2, "")
	if r.OK || r.Error == "" {
		t.Fatalf("%+v", r)
	}
}

func TestProbeUDPSoftOKWhenSilent(t *testing.T) {
	pc, err := net.ListenPacket("udp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer pc.Close()
	// Intentionally do not Read — mimics Hy2/AWG ignoring garbage probes.
	_, port, err := net.SplitHostPort(pc.LocalAddr().String())
	if err != nil {
		t.Fatal(err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	start := time.Now()
	rtt, soft, err := probeUDP(ctx, "127.0.0.1", port)
	if err != nil {
		t.Fatalf("expected soft-ok, got err=%v", err)
	}
	if !soft {
		t.Fatal("expected soft=true")
	}
	if rtt <= 0 {
		t.Fatalf("rtt=%v", rtt)
	}
	if time.Since(start) > 900*time.Millisecond {
		t.Fatalf("soft-ok waited too long: %v (should not use long timeout)", time.Since(start))
	}

	res := PingProfile(ctx, "silent", config.ProtocolHysteria2, "hysteria2://x@127.0.0.1:"+port+"/")
	if !res.OK || !res.Soft {
		t.Fatalf("PingProfile soft-ok failed: %+v", res)
	}
	if res.Ms < 1 {
		t.Fatalf("ms=%d", res.Ms)
	}
	if _, ok := BestOK([]Result{res}); ok {
		t.Fatal("BestOK must ignore soft-up")
	}
}

func TestProbeUDPReplyOK(t *testing.T) {
	pc, err := net.ListenPacket("udp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer pc.Close()
	go func() {
		buf := make([]byte, 64)
		n, addr, err := pc.ReadFrom(buf)
		if err != nil || n == 0 {
			return
		}
		_, _ = pc.WriteTo([]byte{1}, addr)
	}()
	_, port, err := net.SplitHostPort(pc.LocalAddr().String())
	if err != nil {
		t.Fatal(err)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	rtt, soft, err := probeUDP(ctx, "127.0.0.1", port)
	if err != nil {
		t.Fatal(err)
	}
	if soft {
		t.Fatal("reply should be hard-ok")
	}
	if rtt <= 0 {
		t.Fatalf("rtt=%v", rtt)
	}
}