package group

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

func TestConcurrentMap(t *testing.T) {
	cm := NewConcurrentMap[string, string](16, func(k string) string { return k })
	concurrent := 1000

	wg := sync.WaitGroup{}
	wg.Add(concurrent)

	for i := 0; i < concurrent; i++ {
		go func(loop int) {
			for j := 0; j < concurrent; j++ {
				k := fmt.Sprintf("%d-%d", loop, j)
				cm.Store(k, k)
			}
			wg.Done()
		}(i)
	}
	wg.Wait()

	wg.Add(concurrent)

	for i := 0; i < concurrent; i++ {
		go func() {
			r := rand.New(rand.NewSource(time.Now().UnixMilli()))
			for i := 0; i < concurrent; i++ {
				k := fmt.Sprintf("%d-%d", r.Intn(concurrent), r.Intn(concurrent))
				v, ok := cm.Load(k)
				if !ok || v != k {
					t.Errorf("value load error: %s", k)
				}
			}
			wg.Done()
		}()
	}

	wg.Wait()
}