package worker

import (
	"fmt"
	"sync"
	"time"
)

// ProsesSertifikasi simulates certification processing for a single user.
func ProsesSertifikasi(userID int) string {
	// simulate variable work (sleep)
	time.Sleep(time.Millisecond * time.Duration(50+userID%10*20))
	return fmt.Sprintf("user-%d: done", userID)
}

// RunSertifikasi starts n goroutines and waits for all to finish.
// Returns results in a slice.
func RunSertifikasi(n int) []string {
	var wg sync.WaitGroup
	wg.Add(n)

	results := make([]string, n)
	for i := 0; i < n; i++ {
		i := i // capture
		go func() {
			defer wg.Done()
			results[i] = ProsesSertifikasi(i + 1)
		}()
	}
	wg.Wait()
	return results
}