//go:build integration

package builderkeys

import (
	"context"
	"testing"
	"time"

	"github.com/nats-io/nats.go/jetstream"
)

// 1886/AC1 and AC4 on a real bus: no bucket of instances says no and watches nothing; an instance's key saying
// references says yes, and its put and its delete each wake the watcher, with no timer.
func TestTheBuildersSayIsReadAndWatchedOnTheBus(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
	defer cancel()
	js := aBus(t)
	r := Reader{JS: js}
	if says, err := r.SaysReferences(ctx); err != nil || says {
		t.Fatalf("no bucket: %v %v", says, err)
	}
	if on, err := WatchSays(ctx, js, func() {}); err != nil || on {
		t.Fatalf("no bucket is watched: %v %v", on, err)
	}
	kv, err := js.CreateKeyValue(ctx, jetstream.KeyValueConfig{Bucket: BuilderInstancesBucket, History: 1})
	if err != nil {
		t.Fatal(err)
	}
	woken := make(chan struct{}, 4)
	if on, err := WatchSays(ctx, js, func() { woken <- struct{}{} }); err != nil || !on {
		t.Fatalf("the bucket is not watched: %v %v", on, err)
	}
	wake := func(what string) {
		t.Helper()
		select {
		case <-woken:
		case <-ctx.Done():
			t.Fatalf("%s woke nothing", what)
		}
	}
	put(t, kv, "shanks", []byte(`{"writes":["references"]}`))
	wake("a put")
	if says, err := r.SaysReferences(ctx); err != nil || !says {
		t.Fatalf("an instance saying references: %v %v", says, err)
	}
	if err := kv.Delete(ctx, "shanks"); err != nil {
		t.Fatal(err)
	}
	wake("a delete")
	if says, err := r.SaysReferences(ctx); err != nil || says {
		t.Fatalf("no instance left: %v %v", says, err)
	}
}