package eventbus

import (
	"testing"
	"time"
)

func TestPubSub(t *testing.T) {
	bus := New()
	ch, unsub := bus.Subscribe("task-1")
	defer unsub()

	bus.Log("task-1", "hello")
	bus.Phase("task-1", "summoning")
	bus.Complete("task-1", "essence-abc")

	got := []string{}
	for ev := range ch {
		got = append(got, string(ev.Type)+":"+ev.Data)
		if ev.Type == EventComplete {
			break
		}
	}
	if len(got) != 3 {
		t.Fatalf("expected 3 events, got %d: %v", len(got), got)
	}
	if got[0] != "log:hello" {
		t.Errorf("first event: %s", got[0])
	}
	if got[2] != "complete:essence-abc" {
		t.Errorf("last event: %s", got[2])
	}
}

func TestTopicIsolation(t *testing.T) {
	bus := New()
	ch1, _ := bus.Subscribe("task-1")
	ch2, _ := bus.Subscribe("task-2")

	bus.Log("task-1", "only-for-1")
	bus.Log("task-2", "only-for-2")

	select {
	case ev := <-ch1:
		if ev.Data != "only-for-1" {
			t.Fatalf("ch1 got %q", ev.Data)
		}
	case <-time.After(100 * time.Millisecond):
		t.Fatal("ch1 timed out")
	}
	select {
	case ev := <-ch2:
		if ev.Data != "only-for-2" {
			t.Fatalf("ch2 got %q", ev.Data)
		}
	case <-time.After(100 * time.Millisecond):
		t.Fatal("ch2 timed out")
	}
}

func TestUnsubscribe(t *testing.T) {
	bus := New()
	ch, unsub := bus.Subscribe("task-x")
	unsub()
	// Publishing after unsubscribe should not panic and should not block.
	bus.Log("task-x", "no-listeners")
	// Channel should be closed.
	if _, ok := <-ch; ok {
		t.Fatal("channel should be closed after unsubscribe")
	}
}