package controller

import (
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	ws "github.com/gorilla/websocket"

	"github.com/mhsanaei/3x-ui/v3/internal/web/service"
)

// V2.0.2: /api/ws frame cadence follows the operator's fast-report
// interval (probe_fast_interval) instead of the hub's fixed 2 s tick.
// A mid-stream settings change re-paces a live socket: the timer
// already in flight still fires on the old cadence, the next one is
// armed from the re-read setting.
func TestProbeWebSocketCadenceFollowsFastInterval(t *testing.T) {
	rig := newProbeTestRig(t)
	_, _ = rig.seedAgent(t, "CadenceNode", true)
	rig.setSetting(t, "public_page", "on")
	rig.setSetting(t, "probe_fast_interval", "1")
	service.InvalidateProbeSnapshot()

	srv := httptest.NewServer(rig.engine)
	defer srv.Close()
	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "/api/ws"

	conn, _, err := ws.DefaultDialer.Dial(wsURL, nil)
	if err != nil {
		t.Fatalf("dial: %v", err)
	}
	defer conn.Close()

	readAt := func() time.Time {
		t.Helper()
		_ = conn.SetReadDeadline(time.Now().Add(10 * time.Second))
		if _, _, err := conn.ReadMessage(); err != nil {
			t.Fatalf("ws read: %v", err)
		}
		return time.Now()
	}

	_ = readAt() // first frame: immediate
	prev := readAt()
	for i := 0; i < 2; i++ {
		now := readAt()
		if gap := now.Sub(prev); gap < 500*time.Millisecond || gap > 2500*time.Millisecond {
			t.Fatalf("frame gap at 1 s cadence: %v", gap)
		}
		prev = now
	}

	// Change to 3 s mid-stream: one in-flight 1 s frame, then the
	// stream settles onto the new cadence without a reconnect.
	rig.setSetting(t, "probe_fast_interval", "3")
	prev = readAt()
	now := readAt()
	if gap := now.Sub(prev); gap < 2200*time.Millisecond || gap > 6*time.Second {
		t.Fatalf("frame gap after change to 3 s: %v", gap)
	}
}