// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package sqldriver

import (
	"fmt"

	"github.com/jmoiron/sqlx"
)

// NewDriver returns a driver to SQL, either using singleton Driver or sharded Driver
func NewDriver(xdbs []*sqlx.DB, tx *sqlx.Tx, dbShardID int) (Driver, error) {

	if len(xdbs) == 1 {
		return newSingletonSQLDriver(xdbs[0], tx, dbShardID), nil
	}

	if len(xdbs) <= 1 {
		return nil, fmt.Errorf("invalid number of connection for sharded SQL driver")
	}
	// this is the case of multiple database with sharding
	return newShardedSQLDriver(xdbs, tx, dbShardID), nil
}
