package hashmap

import (
	"bytes"
	"encoding/gob"
	"fmt"
	"io/ioutil"
	"log"
	"runtime"
	"testing"

	"474420502.top/eson/structure/compare"
)

func loadTestData() []int {
	log.SetFlags(log.Lshortfile)

	data, err := ioutil.ReadFile("../l.log")
	if err != nil {
		log.Println(err)
	}
	var l []int
	decoder := gob.NewDecoder(bytes.NewReader(data))
	decoder.Decode(&l)
	return l
}
func TestCount(t *testing.T) {
	hm := New(HashInt, compare.Int)

	for i := 0; i < 100000; i++ {
		hm.Put(i, i)
	}

	// t.Error(hm.Get(4))
}

func PrintMemUsage() {
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	// For info on each, see: https://golang.org/pkg/runtime/#MemStats
	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
	fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
	fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
	fmt.Printf("\tNumGC = %v\n", m.NumGC)
}

func bToMb(b uint64) uint64 {
	return b / 1024 / 1024
}

var executeCount = 5
var compareSize = 100000

func BenchmarkPut(b *testing.B) {
	b.StopTimer()

	l := loadTestData()
	hm := New(HashInt, compare.Int)
	b.N = len(l) * executeCount
	for i := 0; i < len(l); i++ {
		v := l[i]
		hm.Put(v, v)
	}

	b.StartTimer()

	for c := 0; c < executeCount; c++ {
		for i := 0; i < len(l); i++ {
			v := l[i]
			hm.Put(v, v)
		}
	}

	//b.Log(len(hm.table), hm.size)
	//PrintMemUsage()
}

func BenchmarkGoPut(b *testing.B) {

	l := loadTestData()

	hm := make(map[int]int)
	b.N = len(l) * executeCount
	for c := 0; c < executeCount; c++ {
		for i := 0; i < len(l); i++ {
			v := l[i]
			hm[v] = v
		}
	}

	//b.Log(len(m))
	//PrintMemUsage()
}

func BenchmarkGet(b *testing.B) {

	b.StopTimer()
	l := loadTestData()
	hm := New(HashInt, compare.Int)
	b.N = len(l) * executeCount
	for i := 0; i < len(l); i++ {
		v := l[i]
		hm.Put(v, v)
	}
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		hm.Get(i)
	}

	//b.Log(len(hm.table), hm.size)
	//PrintMemUsage()
}

func BenchmarkGoGet(b *testing.B) {
	b.StopTimer()
	l := loadTestData()
	hm := make(map[int]int)
	b.N = len(l) * executeCount

	for i := 0; i < len(l); i++ {
		v := l[i]
		hm[v] = v
	}

	b.StartTimer()
	for i := 0; i < b.N; i++ {
		if _, ok := hm[i]; !ok {

		}
	}
	//b.Log(len(m))
	//PrintMemUsage()
}