package database

import (
	log "github.com/cihub/seelog"

	"os"

	"gopkg.in/mgo.v2"
)

type DB interface {
	Close()
	Copy() DB
	AddBook(book map[string]interface{}) error
	GetBooks(query string, length int, start int) (books []Book, num int, err error)
	GetBooksIter() Iter
	GetNewBooks(query string, length int, start int) (books []Book, num int, err error)
	GetBookId(id string) (Book, error)
	DeleteBook(id string) error
	UpdateBook(id string, data map[string]interface{}) error
	FlagBadQuality(id string, user string) error
	ActiveBook(id string) error
	IsBookActive(id string) bool
	User(name string) *User
	AddUser(name string, pass string) error
	AddNews(text string) error
	GetNews(num int, days int) (news []News, err error)
	AddStats(stats interface{}) error
	GetVisitedBooks() (books []Book, err error)
	UpdateMostVisited() error
	GetDownloadedBooks() (books []Book, err error)
	UpdateDownloadedBooks() error
	GetTags() ([]string, error)
	UpdateTags() error
	GetVisits(visitType VisitType) ([]Visits, error)
	UpdateHourVisits() error
	UpdateDayVisits() error
	UpdateMonthVisits() error
	UpdateHourDownloads() error
	UpdateDayDownloads() error
	UpdateMonthDownloads() error
}

type Iter interface {
	Close() error
	Next(interface{}) bool
}

func Init(host string, name string) DB {
	var err error
	db := new(mgoDB)
	db.session, err = mgo.Dial(host)
	if err != nil {
		log.Critical(err)
		os.Exit(1)
	}
	db.name = name
	db.initIndexes()
	return db
}

func RO(db DB) DB {
	return &roDB{db}
}