package db

import (
	"errors"
	"sync"

	"github.com/jinzhu/gorm"
	_ "github.com/lib/pq"
	_ "github.com/mattn/go-sqlite3"
)

const (
	SQLITE_DRIVER   = "sqlite3"
	POSTGRES_DRIVER = "postgres"
)

type DB struct {
	orm    *gorm.DB
	mutex  *sync.Mutex
	driver string
}

// databe driver name
//support databes 'sqlite3','postgres'
func Open(driver string, args ...interface{}) (*DB, error) {
	if driver == "" {
		return nil, errors.New("Invalid driver name.")
	}
	d, err := gorm.Open(driver, args)
	if err != nil {
		return nil, err
	}
	return &DB{orm: d, mutex: &sync.Mutex{}, driver: driver}, nil
}
func (db DB) isSqlite() bool {
	if db.driver == SQLITE_DRIVER {
		return true
	}
	return false
}
func (db DB) isPostgres() bool {
	if db.driver == POSTGRES_DRIVER {
		return true
	}
	return false
}