package link

import (
	"context"
	"strings"
	"testing"
	"time"

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

// A declared tool check asked over a real bus, through the queue, on the link the node-engine holds:
// the tool's answer is read, and a tool nothing serves is said as such (novox/hq ADR 0240, to-be 48 §3).
func TestNatsAToolCheckIsAskedOnTheLink(t *testing.T) {
	conn, js := aBus(t)
	const node = "toolcheck"
	served, err := conn.Subscribe(ToolSubject("sensors", "sensors_health", node), func(m *nats.Msg) {
		_ = m.Respond([]byte(`{"result":{"healthy":true}}`))
	})
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = served.Unsubscribe() })
	if err := conn.Flush(); err != nil {
		t.Fatal(err)
	}

	q := &Queue{Membership: Membership{Node: node}}
	q.attach(t.Context(), &natsLink{conn: conn, js: js, node: node})
	ctx, cancel := context.WithTimeout(t.Context(), 2*time.Second)
	defer cancel()
	healthy, why, err := q.AskTool(ctx, "sensors", "sensors_health")
	if err != nil || !healthy {
		t.Fatalf("a served healthy tool read as %v %q (%v)", healthy, why, err)
	}
	_, _, err = q.AskTool(ctx, "sensors", "nothing_serves_this")
	if err == nil || !strings.Contains(err.Error(), "nothing on this machine answers") {
		t.Fatalf("a tool nothing serves read as %v", err)
	}
}