package stunreachability

import (
	"io"
	"net"
	"time"
)

// TODO(bassosimone): we should use internal/model/mocks rather
// than rolling out a custom type private to this package.

type FakeConn struct {
	ReadError             error
	ReadData              []byte
	SetDeadlineError      error
	SetReadDeadlineError  error
	SetWriteDeadlineError error
	WriteError            error
}

func (c *FakeConn) Read(b []byte) (int, error) {
	if len(c.ReadData) > 0 {
		n := copy(b, c.ReadData)
		c.ReadData = c.ReadData[n:]
		return n, nil
	}
	if c.ReadError != nil {
		return 0, c.ReadError
	}
	return 0, io.EOF
}

func (c *FakeConn) Write(b []byte) (n int, err error) {
	if c.WriteError != nil {
		return 0, c.WriteError
	}
	n = len(b)
	return
}

func (*FakeConn) Close() (err error) {
	return
}

func (*FakeConn) LocalAddr() net.Addr {
	return &net.TCPAddr{}
}

func (*FakeConn) RemoteAddr() net.Addr {
	return &net.TCPAddr{}
}

func (c *FakeConn) SetDeadline(t time.Time) (err error) {
	return c.SetDeadlineError
}

func (c *FakeConn) SetReadDeadline(t time.Time) (err error) {
	return c.SetReadDeadlineError
}

func (c *FakeConn) SetWriteDeadline(t time.Time) (err error) {
	return c.SetWriteDeadlineError
}