/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 extension

import (
	"sync"
)

import (
	"github.com/apache/dubbo-go/cluster/router"
)

var (
	routers               = make(map[string]func() router.PriorityRouterFactory)
	fileRouterFactoryOnce sync.Once
	fileRouterFactories   = make(map[string]router.FilePriorityRouterFactory)
)

// SetRouterFactory sets create router factory function with @name
func SetRouterFactory(name string, fun func() router.PriorityRouterFactory) {
	routers[name] = fun
}

// GetRouterFactory gets create router factory function by @name
func GetRouterFactory(name string) router.PriorityRouterFactory {
	if routers[name] == nil {
		panic("router_factory for " + name + " is not existing, make sure you have import the package.")
	}
	return routers[name]()
}

// GetRouterFactories gets all create router factory function
func GetRouterFactories() map[string]func() router.PriorityRouterFactory {
	return routers
}

// GetFileRouterFactories gets all create file router factory instance
func GetFileRouterFactories() map[string]router.FilePriorityRouterFactory {
	l := len(routers)
	if l == 0 {
		return nil
	}
	fileRouterFactoryOnce.Do(func() {
		for k := range routers {
			factory := GetRouterFactory(k)
			if fr, ok := factory.(router.FilePriorityRouterFactory); ok {
				fileRouterFactories[k] = fr
			}
		}
	})
	return fileRouterFactories
}