package dao

import (
	"crypto/md5"
	"fmt"
	"io"
	"strings"

	"github.com/willie68/schematic-service-go/model"
)

/*
StorageDao this is the interface which all method implementation of a storage engine has to fulfill
*/
type StorageDao interface {
	AddFile(filename string, reader io.Reader) (string, error)
	CreateSchematic(schematic model.Schematic) (string, error)
	GetSchematic(schematicID string) (model.Schematic, error)
	GetFile(fileid string, stream io.Writer) error
	GetSchematics(query string, offset int, limit int, owner string) (int64, []model.Schematic, error)
	DeleteSchematic(schematicID string) error
	CreateTag(tag string) error
	GetTags() []string
	GetTagsCount() int
	CreateManufacturer(manufacturer string) error
	GetManufacturers() []string
	GetManufacturersCount() int

	CheckUser(username string, password string) bool
	GetUser(username string) (model.User, bool)

	AddUser(user model.User) error
	DeleteUser(username string) error
	ChangePWD(username string, newpassword string, oldpassword string) error

	DropAll()
	Ping() error

	Stop()
}

var Storage StorageDao

func GetStorage() StorageDao {
	return Storage
}

func BuildPasswordHash(password string) string {
	if !strings.HasPrefix(password, "md5:") {
		hash := md5.Sum([]byte(password))
		password = fmt.Sprintf("md5:%x", hash)
	}
	return password
}