package gtq

import (
	"runtime"
	"sync"
	"testing"
	"time"
)

var numTestPrios = 10
var tq *TaskQueue

func testTQAdd(n int) {
	workers := runtime.GOMAXPROCS(0)
	var wg sync.WaitGroup
	for i := 0; i < workers; i++ {
		wg.Add(1)
		go func() {
			for i := 0; i < n; i++ {
				// simplest possible task
				tq.Add(func() {
					time.Sleep(0)
				}, uint(i%numTestPrios))
			}
			wg.Done()
		}()
	}
	wg.Wait()
}

func TestTaskQueueAdd(t *testing.T) {
	tq = NewTaskQueue(0)
	testTQAdd(1000000)
	expected := 1000000 * runtime.GOMAXPROCS(0)
	added := tq.Length()
	if uint(expected) != added {
		t.Error("expected to add", expected, "but added", added)
	} else {
		t.Log("added", added)
	}
}

func BenchmarkSimpleScheduler(b *testing.B) {
	tq = NewTaskQueue(0)
	testTQAdd(b.N / (runtime.GOMAXPROCS(0)))
	tq.Start(SimpleScheduler)
	for tq.Length() > 0 {
		time.Sleep(10 * time.Millisecond)
	}
	tq.Stop()
}

func BenchmarkTimeSliceScheduler(b *testing.B) {
	tq = NewTaskQueue(0)
	testTQAdd(b.N / (runtime.GOMAXPROCS(0)))
	tq.Start(TimeSliceScheduler)
	for tq.Length() > 0 {
		time.Sleep(10 * time.Millisecond)
	}
	tq.Stop()
}