package daemon

import (
	"fmt"
	"testing"
	"time"

	"gopkg.in/tomb.v2"

	"akvorado/common/reporter"
)

func TestTerminate(t *testing.T) {
	r := reporter.NewMock(t)
	c, err := New(r)
	if err != nil {
		t.Fatalf("New() error:\n%+v", err)
	}
	c.Start()

	select {
	case <-c.Terminated():
		t.Fatalf("Terminated() was closed while we didn't request termination")
	default:
		// OK
	}

	c.Terminate()
	select {
	case _, ok := <-c.Terminated():
		if ok {
			t.Fatalf("Terminated() returned an unexpected value")
		}
		// OK
	default:
		t.Fatalf("Terminated() wasn't closed while we requested it to be")
	}

	c.Terminate() // Can be called several times.
}

func TestStop(t *testing.T) {
	r := reporter.NewMock(t)
	c, err := New(r)
	if err != nil {
		t.Fatalf("New() error:\n%+v", err)
	}
	c.Start()

	select {
	case <-c.Terminated():
		t.Fatalf("Terminated() was closed while we didn't request termination")
	default:
		// OK
	}

	c.Stop()
	select {
	case _, ok := <-c.Terminated():
		if ok {
			t.Fatalf("Terminated() returned an unexpected value")
		}
		// OK
	default:
		t.Fatalf("Terminated() wasn't closed while we requested it to be")
	}
}

func TestTombTracking(t *testing.T) {
	var tomb tomb.Tomb
	r := reporter.NewMock(t)
	c, err := New(r)
	if err != nil {
		t.Fatalf("New() error:\n%+v", err)
	}

	c.Track(&tomb, "tomb")
	c.Start()

	ch := make(chan bool)
	tomb.Go(func() error {
		select {
		case <-tomb.Dying():
			t.Fatalf("Dying() should not happen inside the tomb")
		case <-ch:
			return fmt.Errorf("crashing")
		}
		return nil
	})
	time.Sleep(10 * time.Millisecond) // should be runtime.Gosched()

	select {
	case <-tomb.Dying():
		t.Fatalf("Dying() was closed while the tomb is not dead")
	case <-c.Terminated():
		t.Fatalf("Terminated() was closed while we didn't request termination")
	default:
		// OK
	}

	close(ch)
	tomb.Wait()
	time.Sleep(10 * time.Millisecond) // should be runtime.Gosched(), but this is not enough
	select {
	case <-c.Terminated():
		// OK
	default:
		t.Fatalf("Terminated() was not closed while tomb is dead")
	}

	c.Stop()
}