package mux

import (
	"net"
	"time"
)

type PortConn struct {
	Conn  net.Conn
	rs    []byte
	start int
}

func newPortConn(conn net.Conn, rs []byte) *PortConn {
	return &PortConn{
		Conn: conn,
		rs:   rs,
	}
}

func (pConn *PortConn) Read(b []byte) (n int, err error) {
	if len(b) < len(pConn.rs)-pConn.start {
		defer func() {
			pConn.start = pConn.start + len(b)
		}()
		return copy(b, pConn.rs), nil
	}
	if pConn.start < len(pConn.rs) {
		defer func() {
			pConn.start = len(pConn.rs)
		}()
		return copy(b, pConn.rs[pConn.start:]), nil
	}
	return pConn.Conn.Read(b)
}

func (pConn *PortConn) Write(b []byte) (n int, err error) {
	return pConn.Conn.Write(b)
}

func (pConn *PortConn) Close() error {
	return pConn.Conn.Close()
}

func (pConn *PortConn) LocalAddr() net.Addr {
	return pConn.Conn.LocalAddr()
}

func (pConn *PortConn) RemoteAddr() net.Addr {
	return pConn.Conn.RemoteAddr()
}

func (pConn *PortConn) SetDeadline(t time.Time) error {
	return pConn.Conn.SetDeadline(t)
}

func (pConn *PortConn) SetReadDeadline(t time.Time) error {
	return pConn.Conn.SetReadDeadline(t)
}

func (pConn *PortConn) SetWriteDeadline(t time.Time) error {
	return pConn.Conn.SetWriteDeadline(t)
}