// Copyright 2014-2016 Apcera Inc. All rights reserved.

package server

import (
	"math/rand"
	"strconv"
	"sync"
	"testing"
	"time"
)

func TestParseSize(t *testing.T) {
	if parseSize(nil) != -1 {
		t.Fatal("Should error on nil byte slice")
	}
	n := []byte("12345678")
	if pn := parseSize(n); pn != 12345678 {
		t.Fatalf("Did not parse %q correctly, res=%d\n", n, pn)
	}
}

func TestParseSInt64(t *testing.T) {
	if parseInt64(nil) != -1 {
		t.Fatal("Should error on nil byte slice")
	}
	n := []byte("12345678")
	if pn := parseInt64(n); pn != 12345678 {
		t.Fatalf("Did not parse %q correctly, res=%d\n", n, pn)
	}
}

func BenchmarkParseInt(b *testing.B) {
	b.SetBytes(1)
	n := "12345678"
	for i := 0; i < b.N; i++ {
		strconv.ParseInt(n, 10, 0)
	}
}

func BenchmarkParseSize(b *testing.B) {
	b.SetBytes(1)
	n := []byte("12345678")
	for i := 0; i < b.N; i++ {
		parseSize(n)
	}
}

func deferUnlock(mu *sync.Mutex) {
	mu.Lock()
	defer mu.Unlock()
	// see noDeferUnlock
	if false {
		return
	}
}

func BenchmarkDeferMutex(b *testing.B) {
	var mu sync.Mutex
	b.SetBytes(1)
	for i := 0; i < b.N; i++ {
		deferUnlock(&mu)
	}
}

func noDeferUnlock(mu *sync.Mutex) {
	mu.Lock()
	// prevent staticcheck warning about empty critical section
	if false {
		return
	}
	mu.Unlock()
}

func BenchmarkNoDeferMutex(b *testing.B) {
	var mu sync.Mutex
	b.SetBytes(1)
	for i := 0; i < b.N; i++ {
		noDeferUnlock(&mu)
	}
}

func createTestSub() *subscription {
	return &subscription{
		subject: []byte("foo"),
		queue:   []byte("bar"),
		sid:     []byte("22"),
	}
}

func BenchmarkArrayRand(b *testing.B) {
	b.StopTimer()
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	// Create an array of 10 items
	subs := []*subscription{}
	for i := 0; i < 10; i++ {
		subs = append(subs, createTestSub())
	}
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		index := r.Intn(len(subs))
		_ = subs[index]
	}
}

func BenchmarkMapRange(b *testing.B) {
	b.StopTimer()
	// Create an map of 10 items
	subs := map[int]*subscription{}
	for i := 0; i < 10; i++ {
		subs[i] = createTestSub()
	}
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		for range subs {
			break
		}
	}
}