// TODO
package database

import (
	"time"

	log "github.com/cihub/seelog"
)

func (db *pgDB) AddStats(stats interface{}) error {
	return nil
}

/* Get the most visited books
 */
func (db *pgDB) GetVisitedBooks() (books []Book, err error) {
	return []Book{}, nil
}

/* Get the most downloaded books
 */
func (db *pgDB) GetDownloadedBooks() (books []Book, err error) {
	return []Book{}, nil
}

func (db *pgDB) GetTags() ([]string, error) {
	return db.tags, nil
}

func (db *pgDB) updateTags() {
	var tags []string
	err := db.sql.Model(&Book{}).
		ColumnExpr("unnest(tags) as tag").
		Where("active = true").
		Group("tag").
		Order("count(*) DESC").
		Limit(tagsDisplay).
		Select(&tags)
	if err != nil {
		log.Error("Error updating tags: ", err)
	} else {
		db.tags = tags
	}
}

func (db *pgDB) tagUpdater() {
	periodicity := 57 * time.Minute

	for true {
		db.updateTags()
		time.Sleep(periodicity)
	}
}