package elastic

import (
	"fmt"
	"log"
	"strconv"

	"github.com/boltdb/bolt"
)

func getOffset(db *bolt.DB, index string) (int, error) {
	offset := 0
	if err := db.Update(func(tx *bolt.Tx) error {
		b, err := tx.CreateBucketIfNotExists([]byte("position"))
		if err != nil {
			return err
		}
		v := b.Get([]byte(index))
		offset, _ = strconv.Atoi(string(v))
		return nil
	}); err != nil {
		return offset, err
	}
	return offset, nil
}

func setOffset(db *bolt.DB, index string, offset int) error {
	// log.Printf("setOffset() index=%s offset=%d", index, offset)
	if err := db.Update(func(tx *bolt.Tx) error {
		b := tx.Bucket([]byte("position"))

		if err := b.Put([]byte(index), []byte(fmt.Sprintf("%d", offset))); err != nil {
			return err
		}
		return nil
	}); err != nil {
		log.Fatal(err)
	}
	return nil
}