/*
 * Copyright (c) 2020 Baidu, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package factory

import (
	"fmt"

	"github.com/baidu/easyfaas/pkg/repository"
)

var driverFactories = make(map[string]StorageDriverFactory)

type StorageDriverFactory interface {
	Create(parameters map[string]interface{}) (repository.StorageDriver, error)
}

func Register(name string, factory StorageDriverFactory) {
	if factory == nil {
		panic("Must not provide nil StorageDriverFactory")
	}
	_, registered := driverFactories[name]
	if registered {
		panic(fmt.Sprintf("StorageDriverFactory named %s already registered", name))
	}

	driverFactories[name] = factory
}

func Create(name string, parameters map[string]interface{}) (repository.StorageDriver, error) {
	driverFactory, ok := driverFactories[name]
	if !ok {
		return nil, InvalidStorageDriverError{name}
	}
	return driverFactory.Create(parameters)
}

type InvalidStorageDriverError struct {
	Name string
}

func (err InvalidStorageDriverError) Error() string {
	return fmt.Sprintf("StorageDriver not registered: %s", err.Name)
}
