package db

import (
	"github.com/glebarez/sqlite"
	"gorm.io/driver/mysql"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)

var defaultSqlite = "data.db"

func New(opts ...OptionFn) (DB, error) {
	var (
		err  error
		conf = &config{
			sqlite: &defaultSqlite,
		}
		tx *gorm.DB
	)

	for _, opt := range opts {
		opt(conf)
	}

	if conf.mysql != nil {
		tx, err = gorm.Open(mysql.Open(*conf.mysql))
		goto CHECK
	}

	if conf.pg != nil {
		tx, err = gorm.Open(postgres.Open(*conf.pg))
		goto CHECK
	}

	tx, err = gorm.Open(sqlite.Open(*conf.sqlite))

CHECK:
	if err != nil {
		return nil, err
	}

	return &db{tx: tx}, nil
}

func Init(opts ...OptionFn) (err error) {
	Default, err = New(opts...)
	return err
}