// Package rpc ...
//
// Description : rpc ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022-06-29 15:21
package rpc

import (
	"errors"
	"sync"

	"go.uber.org/zap"
)

var (
	// Request 请求实例
	Request *request
)

// InitRPC 初始化RPC服务
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:23 2022/6/29
func InitRPC(serviceTable map[string]*Service, loggerInstance *zap.Logger) error {
	if nil == serviceTable {
		serviceTable = make(map[string]*Service)
	}
	for _, item := range serviceTable {
		if item.ApiTable == nil {
			item.ApiTable = make(map[string]*Api)
		}
	}
	Request = &request{
		logger:       loggerInstance,
		serviceTable: serviceTable,
		lock:         &sync.RWMutex{},
	}
	return nil
}

type request struct {
	logger       *zap.Logger
	serviceTable map[string]*Service
	lock         *sync.RWMutex
}

// AddService 新增一个服务
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:13 2022/6/29
func (r *request) AddService(serviceInfo *Service) error {
	if nil == serviceInfo {
		return errors.New("service info is nil")
	}
	r.lock.Lock()
	defer r.lock.Unlock()
	if _, exist := r.serviceTable[serviceInfo.Flag]; exist {
		return errors.New(serviceInfo.Flag + " already exist")
	}
	r.serviceTable[serviceInfo.Flag] = serviceInfo
	return nil
}

// GetServiceInfo ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:32 2022/6/30
func (r *request) GetServiceInfo(serviceFlag string) (*Service, error) {
	var (
		serviceInfo *Service
		exist       bool
	)

	r.lock.RLock()
	defer r.lock.Unlock()
	if serviceInfo, exist = r.serviceTable[serviceFlag]; !exist {
		return nil, errors.New(serviceFlag + " -> 服务不存在")
	}
	return serviceInfo, nil
}

// RemoveService 删除一个service
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:46 2022/6/30
func (r *request) RemoveService(serviceFlag string) {
	r.lock.Lock()
	defer r.lock.Unlock()
	delete(r.serviceTable, serviceFlag)
}

// AddServiceApi 向一个service中增加Api
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:26 2022/6/30
func (r *request) AddServiceApi(serviceFlag string, apiConfig *Api) error {
	var (
		serviceInfo *Service
		err         error
	)

	if serviceInfo, err = r.GetServiceInfo(serviceFlag); nil != err {
		return err
	}
	r.lock.Lock()
	defer r.lock.Unlock()
	if nil == serviceInfo.ApiTable {
		serviceInfo.ApiTable = make(map[string]*Api)
	}
	serviceInfo.ApiTable[apiConfig.Flag] = apiConfig
	return nil
}

// GetServiceApi 获取服务api配置
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:53 2022/6/30
func (r *request) GetServiceApi(serviceFlag string, apiFlag string) (*Service, *Api, error) {
	var (
		serviceInfo *Service
		err         error
		exist       bool
		apiInfo     *Api
	)
	if serviceInfo, err = r.GetServiceInfo(serviceFlag); nil != err {
		return nil, nil, err
	}
	r.lock.Lock()
	defer r.lock.Unlock()
	if apiInfo, exist = serviceInfo.ApiTable[apiFlag]; !exist {
		return nil, nil, errors.New(serviceFlag + " : " + apiFlag + " -> api")
	}
	return serviceInfo, apiInfo, nil
}

// RemoveServiceApi 删除服务下的一个api
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:02 2022/6/30
func (r *request) RemoveServiceApi(serviceFlag string, apiFlag string) {
	var (
		serviceInfo *Service
		err         error
	)
	if serviceInfo, _, err = r.GetServiceApi(serviceFlag, apiFlag); nil != err {
		// 不存在无需处理
		return
	}
	r.lock.Lock()
	defer r.lock.Unlock()
	delete(serviceInfo.ApiTable, apiFlag)
}