// Copyright 2019 The Waku Library Authors.
//
// The Waku library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Waku library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty off
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Waku library. If not, see <http://www.gnu.org/licenses/>.
//
// This software uses the go-ethereum library, which is licensed
// under the GNU Lesser General Public Library, version 3 or any later.

package waku

import (
	"bytes"
	"crypto/ecdsa"
	"crypto/sha256"
	mrand "math/rand"
	"testing"
	"time"

	"golang.org/x/crypto/pbkdf2"

	"github.com/ethereum/go-ethereum/crypto"

	"github.com/status-im/status-go/waku/common"
	v0 "github.com/status-im/status-go/waku/v0"
)

var seed int64

// InitSingleTest should be called in the beginning of every
// test, which uses RNG, in order to make the tests
// reproducibility independent of their sequence.
func InitSingleTest() {
	seed = time.Now().Unix()
	mrand.Seed(seed)
}

func TestBasic(t *testing.T) {
	w := New(nil, nil)
	p := w.Protocols()
	waku := p[0]
	if waku.Name != v0.Name {
		t.Fatalf("failed Peer Name: %v.", waku.Name)
	}
	if uint64(waku.Version) != v0.Version {
		t.Fatalf("failed Peer Version: %v.", waku.Version)
	}
	if waku.Length != v0.NumberOfMessageCodes {
		t.Fatalf("failed Peer Length: %v.", waku.Length)
	}
	if waku.Run == nil {
		t.Fatalf("failed waku.Run.")
	}
	if w.GetFilter("non-existent") != nil {
		t.Fatalf("failed GetFilter.")
	}

	peerID := make([]byte, 64)
	mrand.Read(peerID) // nolint: gosec
	peer, _ := w.getPeer(peerID)
	if peer != nil {
		t.Fatal("found peer for random key.")
	}
	if err := w.AllowP2PMessagesFromPeer(peerID); err == nil {
		t.Fatalf("failed MarkPeerTrusted.")
	}
	exist := w.HasSymKey("non-existing")
	if exist {
		t.Fatalf("failed HasSymKey.")
	}
	key, err := w.GetSymKey("non-existing")
	if err == nil {
		t.Fatalf("failed GetSymKey(non-existing): false positive.")
	}
	if key != nil {
		t.Fatalf("failed GetSymKey: false positive.")
	}
	mail := w.Envelopes()
	if len(mail) != 0 {
		t.Fatalf("failed w.Envelopes().")
	}

	derived := pbkdf2.Key(peerID, nil, 65356, common.AESKeyLength, sha256.New)
	if !common.ValidateDataIntegrity(derived, common.AESKeyLength) {
		t.Fatalf("failed validateSymmetricKey with param = %v.", derived)
	}
	if common.ContainsOnlyZeros(derived) {
		t.Fatalf("failed containsOnlyZeros with param = %v.", derived)
	}

	buf := []byte{0xFF, 0xE5, 0x80, 0x2, 0}
	le := common.BytesToUintLittleEndian(buf)
	be := common.BytesToUintBigEndian(buf)
	if le != uint64(0x280e5ff) {
		t.Fatalf("failed bytesToIntLittleEndian: %d.", le)
	}
	if be != uint64(0xffe5800200) {
		t.Fatalf("failed BytesToIntBigEndian: %d.", be)
	}

	id, err := w.NewKeyPair()
	if err != nil {
		t.Fatalf("failed to generate new key pair: %s.", err)
	}
	pk, err := w.GetPrivateKey(id)
	if err != nil {
		t.Fatalf("failed to retrieve new key pair: %s.", err)
	}
	if !validatePrivateKey(pk) {
		t.Fatalf("failed validatePrivateKey: %v.", pk)
	}
	if !common.ValidatePublicKey(&pk.PublicKey) {
		t.Fatalf("failed ValidatePublicKey: %v.", pk)
	}
}

func TestAsymmetricKeyImport(t *testing.T) {
	var (
		w           = New(nil, nil)
		privateKeys []*ecdsa.PrivateKey
	)

	for i := 0; i < 50; i++ {
		id, err := w.NewKeyPair()
		if err != nil {
			t.Fatalf("could not generate key: %v", err)
		}

		pk, err := w.GetPrivateKey(id)
		if err != nil {
			t.Fatalf("could not export private key: %v", err)
		}

		privateKeys = append(privateKeys, pk)

		if !w.DeleteKeyPair(id) {
			t.Fatalf("could not delete private key")
		}
	}

	for _, pk := range privateKeys {
		if _, err := w.AddKeyPair(pk); err != nil {
			t.Fatalf("could not import private key: %v", err)
		}
	}
}

func TestWakuIdentityManagement(t *testing.T) {
	w := New(nil, nil)
	id1, err := w.NewKeyPair()
	if err != nil {
		t.Fatalf("failed to generate new key pair: %s.", err)
	}
	id2, err := w.NewKeyPair()
	if err != nil {
		t.Fatalf("failed to generate new key pair: %s.", err)
	}
	pk1, err := w.GetPrivateKey(id1)
	if err != nil {
		t.Fatalf("failed to retrieve the key pair: %s.", err)
	}
	pk2, err := w.GetPrivateKey(id2)
	if err != nil {
		t.Fatalf("failed to retrieve the key pair: %s.", err)
	}

	if !w.HasKeyPair(id1) {
		t.Fatalf("failed HasIdentity(pk1).")
	}
	if !w.HasKeyPair(id2) {
		t.Fatalf("failed HasIdentity(pk2).")
	}
	if pk1 == nil {
		t.Fatalf("failed GetIdentity(pk1).")
	}
	if pk2 == nil {
		t.Fatalf("failed GetIdentity(pk2).")
	}

	if !validatePrivateKey(pk1) {
		t.Fatalf("pk1 is invalid.")
	}
	if !validatePrivateKey(pk2) {
		t.Fatalf("pk2 is invalid.")
	}

	// Delete one identity
	done := w.DeleteKeyPair(id1)
	if !done {
		t.Fatalf("failed to delete id1.")
	}
	pk1, err = w.GetPrivateKey(id1)
	if err == nil {
		t.Fatalf("retrieve the key pair: false positive.")
	}
	pk2, err = w.GetPrivateKey(id2)
	if err != nil {
		t.Fatalf("failed to retrieve the key pair: %s.", err)
	}
	if w.HasKeyPair(id1) {
		t.Fatalf("failed DeleteIdentity(pub1): still exist.")
	}
	if !w.HasKeyPair(id2) {
		t.Fatalf("failed DeleteIdentity(pub1): pub2 does not exist.")
	}
	if pk1 != nil {
		t.Fatalf("failed DeleteIdentity(pub1): first key still exist.")
	}
	if pk2 == nil {
		t.Fatalf("failed DeleteIdentity(pub1): second key does not exist.")
	}

	// Delete again non-existing identity
	done = w.DeleteKeyPair(id1)
	if done {
		t.Fatalf("delete id1: false positive.")
	}
	pk1, err = w.GetPrivateKey(id1)
	if err == nil {
		t.Fatalf("retrieve the key pair: false positive.")
	}
	pk2, err = w.GetPrivateKey(id2)
	if err != nil {
		t.Fatalf("failed to retrieve the key pair: %s.", err)
	}
	if w.HasKeyPair(id1) {
		t.Fatalf("failed delete non-existing identity: exist.")
	}
	if !w.HasKeyPair(id2) {
		t.Fatalf("failed delete non-existing identity: pub2 does not exist.")
	}
	if pk1 != nil {
		t.Fatalf("failed delete non-existing identity: first key exist.")
	}
	if pk2 == nil {
		t.Fatalf("failed delete non-existing identity: second key does not exist.")
	}

	// Delete second identity
	done = w.DeleteKeyPair(id2)
	if !done {
		t.Fatalf("failed to delete id2.")
	}
	pk1, err = w.GetPrivateKey(id1)
	if err == nil {
		t.Fatalf("retrieve the key pair: false positive.")
	}
	pk2, err = w.GetPrivateKey(id2)
	if err == nil {
		t.Fatalf("retrieve the key pair: false positive.")
	}
	if w.HasKeyPair(id1) {
		t.Fatalf("failed delete second identity: first identity exist.")
	}
	if w.HasKeyPair(id2) {
		t.Fatalf("failed delete second identity: still exist.")
	}
	if pk1 != nil {
		t.Fatalf("failed delete second identity: first key exist.")
	}
	if pk2 != nil {
		t.Fatalf("failed delete second identity: second key exist.")
	}
}

func TestSymKeyManagement(t *testing.T) {
	InitSingleTest()

	var err error
	var k1, k2 []byte
	w := New(nil, nil)
	id2 := "arbitrary-string-2"

	id1, err := w.GenerateSymKey()
	if err != nil {
		t.Fatalf("failed GenerateSymKey with seed %d: %s.", seed, err)
	}

	k1, err = w.GetSymKey(id1)
	if err != nil {
		t.Fatalf("failed GetSymKey(id1).")
	}
	k2, err = w.GetSymKey(id2)
	if err == nil {
		t.Fatalf("failed GetSymKey(id2): false positive.")
	}
	if !w.HasSymKey(id1) {
		t.Fatalf("failed HasSymKey(id1).")
	}
	if w.HasSymKey(id2) {
		t.Fatalf("failed HasSymKey(id2): false positive.")
	}
	if k1 == nil {
		t.Fatalf("first key does not exist.")
	}
	if k2 != nil {
		t.Fatalf("second key still exist.")
	}

	// add existing id, nothing should change
	randomKey := make([]byte, common.AESKeyLength)
	mrand.Read(randomKey) // nolint: gosec
	id1, err = w.AddSymKeyDirect(randomKey)
	if err != nil {
		t.Fatalf("failed AddSymKey with seed %d: %s.", seed, err)
	}

	k1, err = w.GetSymKey(id1)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id1).")
	}
	k2, err = w.GetSymKey(id2)
	if err == nil {
		t.Fatalf("failed w.GetSymKey(id2): false positive.")
	}
	if !w.HasSymKey(id1) {
		t.Fatalf("failed w.HasSymKey(id1).")
	}
	if w.HasSymKey(id2) {
		t.Fatalf("failed w.HasSymKey(id2): false positive.")
	}
	if k1 == nil {
		t.Fatalf("first key does not exist.")
	}
	if !bytes.Equal(k1, randomKey) {
		t.Fatalf("k1 != randomKey.")
	}
	if k2 != nil {
		t.Fatalf("second key already exist.")
	}

	id2, err = w.AddSymKeyDirect(randomKey)
	if err != nil {
		t.Fatalf("failed AddSymKey(id2) with seed %d: %s.", seed, err)
	}
	k1, err = w.GetSymKey(id1)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id1).")
	}
	k2, err = w.GetSymKey(id2)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id2).")
	}
	if !w.HasSymKey(id1) {
		t.Fatalf("HasSymKey(id1) failed.")
	}
	if !w.HasSymKey(id2) {
		t.Fatalf("HasSymKey(id2) failed.")
	}
	if k1 == nil {
		t.Fatalf("k1 does not exist.")
	}
	if k2 == nil {
		t.Fatalf("k2 does not exist.")
	}
	if !bytes.Equal(k1, k2) {
		t.Fatalf("k1 != k2.")
	}
	if !bytes.Equal(k1, randomKey) {
		t.Fatalf("k1 != randomKey.")
	}
	if len(k1) != common.AESKeyLength {
		t.Fatalf("wrong length of k1.")
	}
	if len(k2) != common.AESKeyLength {
		t.Fatalf("wrong length of k2.")
	}

	w.DeleteSymKey(id1)
	k1, err = w.GetSymKey(id1)
	if err == nil {
		t.Fatalf("failed w.GetSymKey(id1): false positive.")
	}
	if k1 != nil {
		t.Fatalf("failed GetSymKey(id1): false positive.")
	}
	k2, err = w.GetSymKey(id2)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id2).")
	}
	if w.HasSymKey(id1) {
		t.Fatalf("failed to delete first key: still exist.")
	}
	if !w.HasSymKey(id2) {
		t.Fatalf("failed to delete first key: second key does not exist.")
	}
	if k2 == nil {
		t.Fatalf("failed to delete first key: second key is nil.")
	}

	w.DeleteSymKey(id1)
	w.DeleteSymKey(id2)
	k1, err = w.GetSymKey(id1)
	if err == nil {
		t.Fatalf("failed w.GetSymKey(id1): false positive.")
	}
	k2, err = w.GetSymKey(id2)
	if err == nil {
		t.Fatalf("failed w.GetSymKey(id2): false positive.")
	}
	if k1 != nil || k2 != nil {
		t.Fatalf("k1 or k2 is not nil")
	}
	if w.HasSymKey(id1) {
		t.Fatalf("failed to delete second key: first key exist.")
	}
	if w.HasSymKey(id2) {
		t.Fatalf("failed to delete second key: still exist.")
	}

	randomKey = make([]byte, common.AESKeyLength+1)
	mrand.Read(randomKey) // nolint: gosec
	_, err = w.AddSymKeyDirect(randomKey)
	if err == nil {
		t.Fatalf("added the key with wrong size, seed %d.", seed)
	}

	const password = "arbitrary data here"
	id1, err = w.AddSymKeyFromPassword(password)
	if err != nil {
		t.Fatalf("failed AddSymKeyFromPassword(id1) with seed %d: %s.", seed, err)
	}
	id2, err = w.AddSymKeyFromPassword(password)
	if err != nil {
		t.Fatalf("failed AddSymKeyFromPassword(id2) with seed %d: %s.", seed, err)
	}
	k1, err = w.GetSymKey(id1)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id1).")
	}
	k2, err = w.GetSymKey(id2)
	if err != nil {
		t.Fatalf("failed w.GetSymKey(id2).")
	}
	if !w.HasSymKey(id1) {
		t.Fatalf("HasSymKey(id1) failed.")
	}
	if !w.HasSymKey(id2) {
		t.Fatalf("HasSymKey(id2) failed.")
	}
	if !common.ValidateDataIntegrity(k2, common.AESKeyLength) {
		t.Fatalf("key validation failed.")
	}
	if !bytes.Equal(k1, k2) {
		t.Fatalf("k1 != k2.")
	}
}

func TestExpiry(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	if err := w.SetMinimumPoW(0.0000001, false); err != nil {
		t.Fatal("failed to set min pow")
	}

	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	if err := w.Start(nil); err != nil {
		t.Fatal("failed to start waku")
	}
	defer func() { handleError(t, w.Stop()) }()

	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	params.TTL = 1

	messagesCount := 5

	// Send a few messages one after another. Due to low PoW and expiration buckets
	// with one second resolution, it covers a case when there are multiple items
	// in a single expiration bucket.
	for i := 0; i < messagesCount; i++ {
		msg, err := common.NewSentMessage(params)
		if err != nil {
			t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
		}
		env, err := msg.Wrap(params, time.Now())
		if err != nil {
			t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
		}

		err = w.Send(env)
		if err != nil {
			t.Fatalf("failed to send envelope with seed %d: %s.", seed, err)
		}
	}

	// wait till received or timeout
	var received, expired bool
	for j := 0; j < 20; j++ {
		time.Sleep(100 * time.Millisecond)
		if len(w.Envelopes()) == messagesCount {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// wait till expired or timeout
	for j := 0; j < 20; j++ {
		time.Sleep(100 * time.Millisecond)
		if len(w.Envelopes()) == 0 {
			expired = true
			break
		}
	}

	if !expired {
		t.Fatalf("expire failed, seed: %d.", seed)
	}
}

func TestCustomization(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	defer func() { handleError(t, w.SetMaxMessageSize(common.DefaultMaxMessageSize)) }()
	if err := w.Start(nil); err != nil {
		t.Fatal("failed to start node")
	}
	defer func() { handleError(t, w.Stop()) }()

	const smallPoW = 0.00001

	f, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	params.KeySym = f.KeySym
	params.Topic = common.BytesToTopic(f.Topics[2])
	params.PoW = smallPoW
	params.TTL = 3600 * 24 // one day
	msg, err := common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err := msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}

	err = w.Send(env)
	if err == nil {
		t.Fatalf("successfully sent envelope with PoW %.06f, false positive (seed %d).", env.PoW(), seed)
	}

	_ = w.SetMinimumPoW(smallPoW/2, true)
	err = w.Send(env)
	if err != nil {
		t.Fatalf("failed to send envelope with seed %d: %s.", seed, err)
	}

	params.TTL++
	msg, err = common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err = msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}
	_ = w.SetMaxMessageSize(uint32(env.Size() - 1))
	err = w.Send(env)
	if err == nil {
		t.Fatalf("successfully sent oversized envelope (seed %d): false positive.", seed)
	}

	_ = w.SetMaxMessageSize(common.DefaultMaxMessageSize)
	err = w.Send(env)
	if err != nil {
		t.Fatalf("failed to send second envelope with seed %d: %s.", seed, err)
	}

	// wait till received or timeout
	var received bool
	for j := 0; j < 20; j++ {
		time.Sleep(100 * time.Millisecond)
		if len(w.Envelopes()) > 1 {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// check w.messages()
	_, err = w.Subscribe(f)
	if err != nil {
		t.Fatalf("failed subscribe with seed %d: %s.", seed, err)
	}
	time.Sleep(5 * time.Millisecond)
	mail := f.Retrieve()
	if len(mail) > 0 {
		t.Fatalf("received premature mail")
	}
}

func TestSymmetricSendCycle(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	defer func() { handleError(t, w.SetMaxMessageSize(common.DefaultMaxMessageSize)) }()
	if err := w.Start(nil); err != nil {
		t.Fatal("failed to start node")
	}
	defer func() { handleError(t, w.Stop()) }()

	filter1, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	filter1.PoW = common.DefaultMinimumPoW

	// Copy the first filter since some of its fields
	// are randomly generated.
	filter2 := &common.Filter{
		KeySym:   filter1.KeySym,
		Topics:   filter1.Topics,
		PoW:      filter1.PoW,
		AllowP2P: filter1.AllowP2P,
		Messages: common.NewMemoryMessageStore(),
	}

	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	filter1.Src = &params.Src.PublicKey
	filter2.Src = &params.Src.PublicKey

	params.KeySym = filter1.KeySym
	params.Topic = common.BytesToTopic(filter1.Topics[2])
	params.PoW = filter1.PoW
	params.WorkTime = 10
	params.TTL = 50
	msg, err := common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err := msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter1)
	if err != nil {
		t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter2)
	if err != nil {
		t.Fatalf("failed subscribe 2 with seed %d: %s.", seed, err)
	}

	err = w.Send(env)
	if err != nil {
		t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
	}

	// wait till received or timeout
	var received bool
	for j := 0; j < 200; j++ {
		time.Sleep(10 * time.Millisecond)
		if len(w.Envelopes()) > 0 {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// check w.messages()
	time.Sleep(5 * time.Millisecond)
	mail1 := filter1.Retrieve()
	mail2 := filter2.Retrieve()
	if len(mail2) == 0 {
		t.Fatalf("did not receive any email for filter 2")
	}
	if len(mail1) == 0 {
		t.Fatalf("did not receive any email for filter 1")
	}

}

func TestSymmetricSendCycleWithTopicInterest(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	defer func() { handleError(t, w.SetMaxMessageSize(common.DefaultMaxMessageSize)) }()
	if err := w.Start(nil); err != nil {
		t.Fatal("could not start node")
	}
	defer func() { handleError(t, w.Stop()) }()

	filter1, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	filter1.PoW = common.DefaultMinimumPoW

	// Copy the first filter since some of its fields
	// are randomly generated.
	filter2 := &common.Filter{
		KeySym:   filter1.KeySym,
		Topics:   filter1.Topics,
		PoW:      filter1.PoW,
		AllowP2P: filter1.AllowP2P,
		Messages: common.NewMemoryMessageStore(),
	}

	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	filter1.Src = &params.Src.PublicKey
	filter2.Src = &params.Src.PublicKey

	params.KeySym = filter1.KeySym
	params.Topic = common.BytesToTopic(filter1.Topics[2])
	params.PoW = filter1.PoW
	params.WorkTime = 10
	params.TTL = 50
	msg, err := common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err := msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter1)
	if err != nil {
		t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter2)
	if err != nil {
		t.Fatalf("failed subscribe 2 with seed %d: %s.", seed, err)
	}

	err = w.Send(env)
	if err != nil {
		t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
	}

	// wait till received or timeout
	var received bool
	for j := 0; j < 200; j++ {
		time.Sleep(10 * time.Millisecond)
		if len(w.Envelopes()) > 0 {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// check w.messages()
	time.Sleep(5 * time.Millisecond)
	mail1 := filter1.Retrieve()
	mail2 := filter2.Retrieve()
	if len(mail2) == 0 {
		t.Fatalf("did not receive any email for filter 2")
	}
	if len(mail1) == 0 {
		t.Fatalf("did not receive any email for filter 1")
	}

}

func TestSymmetricSendWithoutAKey(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	if err := w.Start(nil); err != nil {
		t.Errorf("failed to start waku: '%s'", err)
	}

	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	defer func() { handleError(t, w.SetMaxMessageSize(common.DefaultMaxMessageSize)) }()
	defer func() { handleError(t, w.Stop()) }()

	filter, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	filter.PoW = common.DefaultMinimumPoW

	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	filter.Src = nil

	params.KeySym = filter.KeySym
	params.Topic = common.BytesToTopic(filter.Topics[2])
	params.PoW = filter.PoW
	params.WorkTime = 10
	params.TTL = 50
	msg, err := common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err := msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter)
	if err != nil {
		t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
	}

	err = w.Send(env)
	if err != nil {
		t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
	}

	// wait till received or timeout
	var received bool
	for j := 0; j < 200; j++ {
		time.Sleep(10 * time.Millisecond)
		if len(w.Envelopes()) > 0 {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// check w.messages()
	time.Sleep(5 * time.Millisecond)
	mail := filter.Retrieve()
	if len(mail) == 0 {
		t.Fatalf("did not receive message in spite of not setting a public key")
	}
}

func TestSymmetricSendKeyMismatch(t *testing.T) {
	InitSingleTest()

	w := New(nil, nil)
	if err := w.Start(nil); err != nil {
		t.Errorf("failed to start waku: '%s'", err)
	}
	defer func() { handleError(t, w.SetMinimumPoW(common.DefaultMinimumPoW, false)) }()
	defer func() { handleError(t, w.SetMaxMessageSize(common.DefaultMaxMessageSize)) }()
	defer func() { handleError(t, w.Stop()) }()

	filter, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}
	filter.PoW = common.DefaultMinimumPoW

	params, err := generateMessageParams()
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	params.KeySym = filter.KeySym
	params.Topic = common.BytesToTopic(filter.Topics[2])
	params.PoW = filter.PoW
	params.WorkTime = 10
	params.TTL = 50
	msg, err := common.NewSentMessage(params)
	if err != nil {
		t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
	}
	env, err := msg.Wrap(params, time.Now())
	if err != nil {
		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter)
	if err != nil {
		t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
	}

	err = w.Send(env)
	if err != nil {
		t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
	}

	// wait till received or timeout
	var received bool
	for j := 0; j < 200; j++ {
		time.Sleep(10 * time.Millisecond)
		if len(w.Envelopes()) > 0 {
			received = true
			break
		}
	}

	if !received {
		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
	}

	// check w.messages()
	time.Sleep(5 * time.Millisecond)
	mail := filter.Retrieve()
	if len(mail) > 0 {
		t.Fatalf("received a message when keys weren't matching")
	}
}

func TestBloom(t *testing.T) {
	topic := common.TopicType{0, 0, 255, 6}
	b := topic.ToBloom()
	x := make([]byte, common.BloomFilterSize)
	x[0] = byte(1)
	x[32] = byte(1)
	x[common.BloomFilterSize-1] = byte(128)
	if !common.BloomFilterMatch(x, b) || !common.BloomFilterMatch(b, x) {
		t.Fatalf("bloom filter does not match the mask")
	}

	_, err := mrand.Read(b) // nolint: gosec
	if err != nil {
		t.Fatalf("math rand error")
	}
	_, err = mrand.Read(x) // nolint: gosec
	if err != nil {
		t.Fatalf("math rand error")
	}
	if !common.BloomFilterMatch(b, b) {
		t.Fatalf("bloom filter does not match self")
	}
	x = addBloom(x, b)
	if !common.BloomFilterMatch(x, b) {
		t.Fatalf("bloom filter does not match combined bloom")
	}
	if !common.IsFullNode(nil) {
		t.Fatalf("common.IsFullNode did not recognize nil as full node")
	}
	x[17] = 254
	if common.IsFullNode(x) {
		t.Fatalf("common.IsFullNode false positive")
	}
	for i := 0; i < common.BloomFilterSize; i++ {
		b[i] = byte(255)
	}
	if !common.IsFullNode(b) {
		t.Fatalf("common.IsFullNode false negative")
	}
	if common.BloomFilterMatch(x, b) {
		t.Fatalf("bloomFilterMatch false positive")
	}
	if !common.BloomFilterMatch(b, x) {
		t.Fatalf("bloomFilterMatch false negative")
	}

	w := New(nil, nil)
	f := w.BloomFilter()
	if f != nil {
		t.Fatalf("wrong bloom on creation")
	}
	err = w.SetBloomFilter(x)
	if err != nil {
		t.Fatalf("failed to set bloom filter: %s", err)
	}
	f = w.BloomFilter()
	if !common.BloomFilterMatch(f, x) || !common.BloomFilterMatch(x, f) {
		t.Fatalf("retireved wrong bloom filter")
	}
}

func TestTopicInterest(t *testing.T) {
	w := New(nil, nil)
	topicInterest := w.TopicInterest()
	if topicInterest != nil {
		t.Fatalf("wrong topic on creation")
	}

	filter1, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter1)
	if err != nil {
		t.Fatalf("failed subscribe with seed %d: %s.", seed, err)
	}

	topicInterest = w.TopicInterest()
	if len(topicInterest) != len(filter1.Topics) {
		t.Fatalf("wrong number of topics created")
	}

	filter2, err := generateFilter(t, true)
	if err != nil {
		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
	}

	_, err = w.Subscribe(filter2)
	if err != nil {
		t.Fatalf("failed subscribe with seed %d: %s.", seed, err)
	}

	topicInterest = w.TopicInterest()
	if len(topicInterest) != len(filter1.Topics)+len(filter2.Topics) {
		t.Fatalf("wrong number of topics created")
	}

}

func handleError(t *testing.T, err error) {
	if err != nil {
		t.Logf("deferred function error: '%s'", err)
	}
}

func generateFilter(t *testing.T, symmetric bool) (*common.Filter, error) {
	var f common.Filter
	f.Messages = common.NewMemoryMessageStore()

	const topicNum = 8
	f.Topics = make([][]byte, topicNum)
	for i := 0; i < topicNum; i++ {
		f.Topics[i] = make([]byte, 4)
		mrand.Read(f.Topics[i]) // nolint: gosec
		f.Topics[i][0] = 0x01
	}

	key, err := crypto.GenerateKey()
	if err != nil {
		t.Fatalf("generateFilter 1 failed with seed %d.", seed)
		return nil, err
	}
	f.Src = &key.PublicKey

	if symmetric {
		f.KeySym = make([]byte, common.AESKeyLength)
		mrand.Read(f.KeySym) // nolint: gosec
		f.SymKeyHash = crypto.Keccak256Hash(f.KeySym)
	} else {
		f.KeyAsym, err = crypto.GenerateKey()
		if err != nil {
			t.Fatalf("generateFilter 2 failed with seed %d.", seed)
			return nil, err
		}
	}

	// AcceptP2P & PoW are not set
	return &f, nil
}