package shortify

import (
	"sync"

	"go.etcd.io/bbolt"
)

// Global instance
var (
	Global *Shortener
	once   sync.Once
)

func Init(cfg Config) error {
	var err error
	once.Do(func() {
		Global, err = NewShortener(cfg)
	})
	return err
}

// Global instance (duc)
var (
	GlobalIDPool *IDPool
	oncePopper   sync.Once
)

func InitIDPool(db *bbolt.DB, idLen, poolCap, regenThresh int) error {
	var err error
	oncePopper.Do(func() {
		GlobalIDPool, err = NewIDPool(db, idLen, poolCap, regenThresh)
	})
	return err
}