// Package route
// @Author: Wang Feng
// @Description:
// @Version: 0.1.0
// @Date: 2022/6/10 11:02
// @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
//

package route

import (
	"minlib/component"
)

//
//  RoutingTablePoolEntry
//  @Description: 路由表池条目。
//
type RoutingTablePoolEntry struct {
	RoutingTableEntry
	// 记录使用本池条目的所有名称前缀 NamePrefix-名称前缀表项
	NamePrefixTableEntries map[string]*NamePrefixTableEntry
	m_useCount             uint64 // 记录本条目被多少条名称前缀所使用
}

//
//  Init
//  @Description: 初始化目的路由器
//  @receiver pe
//  @param dest
//
func (pe *RoutingTablePoolEntry) Init(dest *component.Identifier) {
	pe.m_destination = dest
	pe.m_useCount = 1
}

//
//  InitRTE
//  @Description: 初始化路由表项和使用数
//  @receiver pe
//  @param rte
//  @param useCount
//
func (pe *RoutingTablePoolEntry) InitRTE(rte *RoutingTableEntry, useCount uint64) {
	pe.m_destination = rte.m_destination
	pe.nextHops = rte.GetNextHops()
	pe.m_useCount = useCount
}

//
//  InitDest
//  @Description: 初始化目的路由器和使用数
//  @receiver pe
//  @param dest
//  @param useCount
//
func (pe *RoutingTablePoolEntry) InitDest(dest *component.Identifier, useCount uint64) {
	pe.m_destination = dest
	pe.m_useCount = useCount
}

//
//  IsEqual
//  @Description: 判断两个路由表池条目是否相等
//  @receiver pe
//  @param npe
//  @return bool
//
func (pe *RoutingTablePoolEntry) IsEqual(npe *RoutingTablePoolEntry) bool {
	if pe.GetDestination().ToUri() == npe.GetDestination().ToUri() &&
		pe.NextHopList.Size() == pe.NextHopList.Size() {
		b := true
		for i := 0; i < pe.NextHopList.Size(); i++ {
			if pe.GetNextHops()[i].LogicFaceUri() != npe.GetNextHops()[i].LogicFaceUri() ||
				pe.GetNextHops()[i].RouteCost.RouteCost() != npe.GetNextHops()[i].RouteCost.RouteCost() {
				b = false
			}
		}
		return b
	}
	return false
}

//
//  GetUseCount
//  @Description: 获取使用数
//  @receiver pe
//  @return uint64
//
func (pe *RoutingTablePoolEntry) GetUseCount() uint64 {
	return pe.m_useCount
}

//
//  IncrementUseCount
//  @Description: 使用数加一，并返回
//  @receiver pe
//  @return uint64
//
func (pe *RoutingTablePoolEntry) IncrementUseCount() uint64 {
	pe.m_useCount++
	return pe.m_useCount
}

//
//  DecrementUseCount
//  @Description: 使用数减一，并返回
//  @receiver pe
//  @return uint64
//
func (pe *RoutingTablePoolEntry) DecrementUseCount() uint64 {
	if pe.m_useCount != 0 {
		pe.m_useCount--
		return pe.m_useCount
	}
	return 0
}

//
//  SetNexthopList
//  @Description: 设置下一跳列表
//  @receiver pe
//  @param list
//
func (pe *RoutingTablePoolEntry) SetNexthopList(list NextHopList) {
	pe.NextHopList = list
}