package modbus

import "sync"

// modbus客户端管理
type modbusManager struct {
	lock      sync.Mutex
	clientMap map[string]MasterClient
}

var manager = modbusManager{
	clientMap: make(map[string]MasterClient),
}

// 获取modbus客户端
func GetClient(url string) (MasterClient, bool) {
	manager.lock.Lock()
	defer manager.lock.Unlock()
	client, ok := manager.clientMap[url]
	return client, ok
}

// 新建客户端
func NewClient(url string) (MasterClient, error) {
	manager.lock.Lock()
	defer manager.lock.Unlock()
	client, err := newClient(url)
	if err != nil {
		return nil, err
	}
	manager.clientMap[url] = client
	return client, err
}

// 获取或新建客户端
func GetOrInitClient(url string) (MasterClient, error) {
	client, ok := GetClient(url)
	if ok {
		return client, nil
	}
	return NewClient(url)
}

// 删除客户端
func DeleteClient(url string) {
	manager.lock.Lock()
	defer manager.lock.Unlock()
	c := manager.clientMap[url]
	if c != nil {
		c.Close()
		delete(manager.clientMap, url)
	}
}