package main

import (
	"crypto/rand"
	"fmt"
	"sync/atomic"
	"time"
)

type nameGen struct {
	prefix  string
	counter atomic.Uint64
}

func NewNameGen() *nameGen {
	currentTime := time.Now().Unix()
	randBytes := make([]byte, 8)
	_, err := rand.Read(randBytes)
	if err != nil {
		panic(err)
	}
	alpha := []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
	uniqRunID := ""
	for _, b := range randBytes {
		uniqRunID += string(alpha[int(b)%len(alpha)])
	}
	return &nameGen{
		prefix:  fmt.Sprintf("%d-%s", currentTime, uniqRunID),
		counter: atomic.Uint64{},
	}
}

func (n *nameGen) Next() string {
	return fmt.Sprintf("%s-%d", n.prefix, n.counter.Add(1))
}