package peer

import (
	"bytes"
	"crypto/rand"
	"testing"

	"golang.org/x/crypto/nacl/box"
)

func TestEncryptDecryptPacket(t *testing.T) {
	pubKey1, privKey1, err := box.GenerateKey(rand.Reader)
	if err != nil {
		t.Fatal(err)
	}

	pubKey2, privKey2, err := box.GenerateKey(rand.Reader)
	if err != nil {
		t.Fatal(err)
	}

	sharedEncKey := [32]byte{}
	box.Precompute(&sharedEncKey, pubKey2, privKey1)

	sharedDecKey := [32]byte{}
	box.Precompute(&sharedDecKey, pubKey1, privKey2)

	original := make([]byte, MTU)
	rand.Read(original)

	nonce := make([]byte, NONCE_SIZE)
	rand.Read(nonce)

	encrypted := make([]byte, BUFFER_SIZE)
	encrypted = encryptPacket(sharedEncKey[:], nonce, original, encrypted)

	decrypted := make([]byte, MTU)
	var ok bool
	decrypted, ok = decryptPacket(sharedDecKey[:], encrypted, decrypted)
	if !ok {
		t.Fatal(ok)
	}

	if !bytes.Equal(original, decrypted) {
		t.Fatal("mismatch")
	}
}

func BenchmarkEncryptPacket(b *testing.B) {
	_, privKey1, err := box.GenerateKey(rand.Reader)
	if err != nil {
		b.Fatal(err)
	}

	pubKey2, _, err := box.GenerateKey(rand.Reader)
	if err != nil {
		b.Fatal(err)
	}

	sharedEncKey := [32]byte{}
	box.Precompute(&sharedEncKey, pubKey2, privKey1)

	original := make([]byte, MTU)
	rand.Read(original)

	nonce := make([]byte, NONCE_SIZE)
	rand.Read(nonce)

	encrypted := make([]byte, BUFFER_SIZE)

	for i := 0; i < b.N; i++ {
		encrypted = encryptPacket(sharedEncKey[:], nonce, original, encrypted)
	}
}

func BenchmarkDecryptPacket(b *testing.B) {
	pubKey1, privKey1, err := box.GenerateKey(rand.Reader)
	if err != nil {
		b.Fatal(err)
	}

	pubKey2, privKey2, err := box.GenerateKey(rand.Reader)
	if err != nil {
		b.Fatal(err)
	}

	sharedEncKey := [32]byte{}
	box.Precompute(&sharedEncKey, pubKey2, privKey1)

	sharedDecKey := [32]byte{}
	box.Precompute(&sharedDecKey, pubKey1, privKey2)

	original := make([]byte, MTU)
	rand.Read(original)

	nonce := make([]byte, NONCE_SIZE)
	rand.Read(nonce)

	encrypted := make([]byte, BUFFER_SIZE)
	encrypted = encryptPacket(sharedEncKey[:], nonce, original, encrypted)

	decrypted := make([]byte, MTU)
	for i := 0; i < b.N; i++ {
		decrypted, _ = decryptPacket(sharedDecKey[:], encrypted, decrypted)
	}
}