package conn

import (
	"fmt"
	"net"
)

// 消息类型
type MsgType byte

const (
	PingMsg MsgType = iota
	RequestMsg
	ResponseMsg
)

func (t MsgType) String() string {
	switch t {
	case PingMsg:
		return "PingMsg"
	case RequestMsg:
		return "RequestMsg"
	case ResponseMsg:
		return "ResponseMsg"
	default:
		return fmt.Sprintf("Unknown MsgType (%d)", t)
	}
}

// 连接接口，代表一个原始的连接
type Connect interface {
	WriteAuthInfo(channel string, auth []byte) (err error)
	ReadAuthInfo() (proto string, version uint8, channel string, auth []byte, err error)
	WriteRequest(id uint16, cmd string, data []byte) error
	WriteResponse(id uint16, state uint8, data []byte) error
	WritePing(id uint16) error
	ReadMessage(deadline int) (msgType MsgType, id uint16, cmd string, state uint8, data []byte, err error)
	RemoteIP() net.IP
	LocalIP() net.IP
	Close() error
}

// 服务请求连接
type ServerConnectFunc func(conn Connect)

// addrToIP attempts to extract a net.IP from a net.Addr
func AddrToIP(addr net.Addr) net.IP {
	switch v := addr.(type) {
	case *net.TCPAddr:
		return v.IP
	case *net.UDPAddr:
		return v.IP
	case *net.IPAddr:
		return v.IP
	default:
		// Handle other potential net.Addr implementations or return nil
		return nil
	}
}