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/* SPDX-License-Identifier: MIT
 *
 * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
 */

package main

import (
	"bytes"
	"errors"
	"golang.zx2c4.com/wireguard/tun"
	"os"
	"testing"
)

/* Helpers for writing unit tests
 */

type DummyTUN struct {
	name    string
	mtu     int
	packets chan []byte
	events  chan tun.TUNEvent
}

func (tun *DummyTUN) File() *os.File {
	return nil
}

func (tun *DummyTUN) Name() (string, error) {
	return tun.name, nil
}

func (tun *DummyTUN) MTU() (int, error) {
	return tun.mtu, nil
}

func (tun *DummyTUN) Write(d []byte, offset int) (int, error) {
	tun.packets <- d[offset:]
	return len(d), nil
}

func (tun *DummyTUN) Close() error {
	close(tun.events)
	close(tun.packets)
	return nil
}

func (tun *DummyTUN) Events() chan tun.TUNEvent {
	return tun.events
}

func (tun *DummyTUN) Read(d []byte, offset int) (int, error) {
	t, ok := <-tun.packets
	if !ok {
		return 0, errors.New("device closed")
	}
	copy(d[offset:], t)
	return len(t), nil
}

func CreateDummyTUN(name string) (tun.TUNDevice, error) {
	var dummy DummyTUN
	dummy.mtu = 0
	dummy.packets = make(chan []byte, 100)
	dummy.events = make(chan tun.TUNEvent, 10)
	return &dummy, nil
}

func assertNil(t *testing.T, err error) {
	if err != nil {
		t.Fatal(err)
	}
}

func assertEqual(t *testing.T, a []byte, b []byte) {
	if bytes.Compare(a, b) != 0 {
		t.Fatal(a, "!=", b)
	}
}

func randDevice(t *testing.T) *Device {
	sk, err := newPrivateKey()
	if err != nil {
		t.Fatal(err)
	}
	tun, _ := CreateDummyTUN("dummy")
	logger := NewLogger(LogLevelError, "")
	device := NewDevice(tun, logger)
	device.SetPrivateKey(sk)
	return device
}