package locker

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

type Runner struct {
	lock *Locker
	res  sync.Map
}

func NewRunner() *Runner {
	return &Runner{
		lock: NewLocker(),
	}
}

func (r *Runner) Run(wg *sync.WaitGroup, resName string, t *testing.T) {
	for n := 2; n < 1000; n++ {
		r.lock.WaitAndLock(resName)

		val := fmt.Sprintf("%d", n)
		r.res.Store(resName, val)

		td := time.Duration(rand.Uint64()%1000 + 1)
		time.Sleep(td * time.Nanosecond)

		foo, exist := r.res.Load(resName)
		if !exist {
			t.Errorf("not exist!\n")
		}
		if foo != val {
			t.Errorf("not val!\n")
		}
		r.res.Delete(resName)
		r.lock.Done(resName)
		time.Sleep(1 * time.Millisecond)
	}
	wg.Done()
}

func TestLocker(t *testing.T) {
	run := NewRunner()
	var wg sync.WaitGroup
	for n := 1; n < 200; n++ {
		go run.Run(&wg, "foo", t)
		wg.Add(1)
	}
	for n := 1; n < 200; n++ {
		go run.Run(&wg, "foo/bare", t)
		wg.Add(1)
	}
	for n := 1; n < 200; n++ {
		go run.Run(&wg, "foo/bare/foo", t)
		wg.Add(1)
	}
	wg.Wait()
}