package link

import (
	"encoding/json"
	"testing"
	"time"
)

// What the bus module says of its users' connections, read back as advisories (novox/hq ADR 0357, issue
// 270): one per user and kind, each closure counted once however often it is said.
//
//	go test ./internal/link/ -run TestNatsBusFaults   (each test on a bus of its own: internal/testbus)

func sayClosure(t *testing.T, s *Server, event string, c BusClosure) {
	t.Helper()
	body, _ := json.Marshal(c)
	if _, err := s.js.Context().Publish(EventSubject(BusModule, event), body); err != nil {
		t.Fatal(err)
	}
}

func TestTheControllersOwnSlowConsumerAndItsClosedConnectionAreOneAdvisory(t *testing.T) {
	at := time.Date(2026, 10, 14, 12, 0, 0, 0, time.UTC)
	own := []Advisory{{Kind: AdvisorySlowConsumer, ID: "controller", Said: "the controller fell behind", First: at, Last: at, Count: 1}}
	closed := BusClosures([]BusClosure{{User: "controller", CID: 5, Reason: "Slow Consumer (Pending Bytes)",
		Opened: at.Add(-time.Hour), Closed: at.Add(time.Minute)}}, []string{AdvisorySlowConsumer}, at.Add(-time.Hour))
	got := MergeAdvisories(own, closed)
	if len(got) != 1 || got[0].Count != 1 || !got[0].Last.Equal(at.Add(time.Minute)) || got[0].User != "controller" {
		t.Fatalf("merged as %+v: one fall behind, told to the client and closed by the server, is counted once", got)
	}
}

// **A busy hour is read up to a bound, and says it was cut** (review of #326): a storm of closures must not
// spend a watchdog tick, and a count cut short is a floor, said as one.