package pushnotificationclient

import (
	"bytes"
	"crypto/ecdsa"
	"io/ioutil"
	"math/rand"
	"os"
	"testing"

	"github.com/google/uuid"
	"github.com/stretchr/testify/suite"

	"github.com/status-im/status-go/eth-node/crypto"
	"github.com/status-im/status-go/eth-node/crypto/ecies"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/protocol/common"
	"github.com/status-im/status-go/protocol/protobuf"
	"github.com/status-im/status-go/protocol/sqlite"
	"github.com/status-im/status-go/protocol/tt"
)

const testDeviceToken = "test-token"

type ClientSuite struct {
	suite.Suite
	tmpFile        *os.File
	persistence    *Persistence
	identity       *ecdsa.PrivateKey
	installationID string
	client         *Client
}

func TestClientSuite(t *testing.T) {
	s := new(ClientSuite)
	s.installationID = "c6ae4fde-bb65-11ea-b3de-0242ac130004"

	suite.Run(t, s)
}

func (s *ClientSuite) SetupTest() {
	tmpFile, err := ioutil.TempFile("", "")
	s.Require().NoError(err)
	s.tmpFile = tmpFile

	database, err := sqlite.Open(s.tmpFile.Name(), "", sqlite.ReducedKDFIterationsNumber)
	s.Require().NoError(err)
	s.persistence = NewPersistence(database)

	identity, err := crypto.GenerateKey()
	s.Require().NoError(err)
	s.identity = identity

	config := &Config{
		Identity:                   identity,
		Logger:                     tt.MustCreateTestLogger(),
		RemoteNotificationsEnabled: true,
		InstallationID:             s.installationID,
	}

	s.client = New(s.persistence, config, nil, nil)
}

func (s *ClientSuite) TestBuildPushNotificationRegisterMessage() {
	mutedChatList := []string{"a", "b"}

	// build chat lish hashes
	var mutedChatListHashes [][]byte
	for _, chatID := range mutedChatList {
		mutedChatListHashes = append(mutedChatListHashes, common.Shake256([]byte(chatID)))
	}

	contactKey, err := crypto.GenerateKey()
	s.Require().NoError(err)
	contactIDs := []*ecdsa.PublicKey{&contactKey.PublicKey}

	options := &RegistrationOptions{
		ContactIDs:   contactIDs,
		MutedChatIDs: mutedChatList,
	}

	// Set random generator for uuid
	var seed int64 = 1
	uuid.SetRand(rand.New(rand.NewSource(seed))) // nolint: gosec

	// Get token
	expectedUUID := uuid.New().String()

	// Reset random generator
	uuid.SetRand(rand.New(rand.NewSource(seed))) // nolint: gosec

	s.client.deviceToken = testDeviceToken
	// Set reader
	s.client.reader = bytes.NewReader([]byte(expectedUUID))

	registration := &protobuf.PushNotificationRegistration{
		Version:         1,
		AccessToken:     expectedUUID,
		DeviceToken:     testDeviceToken,
		InstallationId:  s.installationID,
		Enabled:         true,
		BlockedChatList: mutedChatListHashes,
	}

	actualMessage, err := s.client.buildPushNotificationRegistrationMessage(options)
	s.Require().NoError(err)

	s.Require().Equal(registration, actualMessage)
}

func (s *ClientSuite) TestBuildPushNotificationRegisterMessageAllowFromContactsOnly() {
	mutedChatList := []string{"a", "b"}
	publicChatList := []string{"c", "d"}

	// build muted chat lish hashes
	var mutedChatListHashes [][]byte
	for _, chatID := range mutedChatList {
		mutedChatListHashes = append(mutedChatListHashes, common.Shake256([]byte(chatID)))
	}

	// build public chat lish hashes
	var publicChatListHashes [][]byte
	for _, chatID := range publicChatList {
		publicChatListHashes = append(publicChatListHashes, common.Shake256([]byte(chatID)))
	}

	contactKey, err := crypto.GenerateKey()
	s.Require().NoError(err)
	contactIDs := []*ecdsa.PublicKey{&contactKey.PublicKey}
	options := &RegistrationOptions{
		ContactIDs:    contactIDs,
		MutedChatIDs:  mutedChatList,
		PublicChatIDs: publicChatList,
	}

	// Set random generator for uuid
	var seed int64 = 1
	uuid.SetRand(rand.New(rand.NewSource(seed))) // nolint: gosec

	// Get token
	expectedUUID := uuid.New().String()

	// set up reader
	reader := bytes.NewReader([]byte(expectedUUID))

	sharedKey, err := ecies.ImportECDSA(s.identity).GenerateShared(
		ecies.ImportECDSAPublic(&contactKey.PublicKey),
		accessTokenKeyLength,
		accessTokenKeyLength,
	)
	s.Require().NoError(err)
	// build encrypted token
	encryptedToken, err := encryptAccessToken([]byte(expectedUUID), sharedKey, reader)
	s.Require().NoError(err)

	// Reset random generator
	uuid.SetRand(rand.New(rand.NewSource(seed))) // nolint: gosec

	s.client.config.AllowFromContactsOnly = true
	s.client.deviceToken = testDeviceToken
	// Set reader
	s.client.reader = bytes.NewReader([]byte(expectedUUID))

	registration := &protobuf.PushNotificationRegistration{
		Version:                 1,
		AccessToken:             expectedUUID,
		DeviceToken:             testDeviceToken,
		InstallationId:          s.installationID,
		AllowFromContactsOnly:   true,
		Enabled:                 true,
		BlockedChatList:         mutedChatListHashes,
		AllowedKeyList:          [][]byte{encryptedToken},
		AllowedMentionsChatList: publicChatListHashes,
	}

	actualMessage, err := s.client.buildPushNotificationRegistrationMessage(options)
	s.Require().NoError(err)

	s.Require().Equal(registration, actualMessage)
}

func (s *ClientSuite) TestHandleMessageScheduled() {
	messageID := []byte("message-id")
	chatID := "chat-id"
	installationID1 := "1"
	installationID2 := "2"
	rawMessage := &common.RawMessage{
		ID:                   types.EncodeHex(messageID),
		SendPushNotification: true,
		LocalChatID:          chatID,
	}

	event := &common.MessageEvent{
		RawMessage: rawMessage,
	}

	s.Require().NoError(s.client.handleMessageScheduled(event))

	key1, err := crypto.GenerateKey()
	s.Require().NoError(err)

	// First time, should notify
	response, err := s.client.shouldNotifyOn(&key1.PublicKey, installationID1, messageID)
	s.Require().NoError(err)
	s.Require().True(response)

	// Save notification
	s.Require().NoError(s.client.notifiedOn(&key1.PublicKey, installationID1, messageID, chatID, protobuf.PushNotification_MESSAGE))

	// Second time, should not notify
	response, err = s.client.shouldNotifyOn(&key1.PublicKey, installationID1, messageID)
	s.Require().NoError(err)
	s.Require().False(response)

	// Different installationID
	response, err = s.client.shouldNotifyOn(&key1.PublicKey, installationID2, messageID)
	s.Require().NoError(err)
	s.Require().True(response)

	key2, err := crypto.GenerateKey()
	s.Require().NoError(err)
	// different key, should notify
	response, err = s.client.shouldNotifyOn(&key2.PublicKey, installationID1, messageID)
	s.Require().NoError(err)
	s.Require().True(response)

	// non tracked message id
	response, err = s.client.shouldNotifyOn(&key1.PublicKey, installationID1, []byte("not-existing"))
	s.Require().NoError(err)
	s.Require().False(response)
}

func (s *ClientSuite) TestShouldRefreshToken() {
	key1, err := crypto.GenerateKey()
	s.Require().NoError(err)
	key2, err := crypto.GenerateKey()
	s.Require().NoError(err)
	key3, err := crypto.GenerateKey()
	s.Require().NoError(err)
	key4, err := crypto.GenerateKey()
	s.Require().NoError(err)

	// Contacts are added
	s.Require().False(s.client.shouldRefreshToken([]*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey}, []*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey, &key3.PublicKey, &key4.PublicKey}, true, true))

	// everything the same
	s.Require().False(s.client.shouldRefreshToken([]*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey}, []*ecdsa.PublicKey{&key2.PublicKey, &key1.PublicKey}, true, true))

	// A contact is removed
	s.Require().True(s.client.shouldRefreshToken([]*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey}, []*ecdsa.PublicKey{&key2.PublicKey}, true, true))

	// allow from contacts only is disabled
	s.Require().False(s.client.shouldRefreshToken([]*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey}, []*ecdsa.PublicKey{&key2.PublicKey, &key1.PublicKey}, true, false))

	// allow from contacts only is enabled
	s.Require().True(s.client.shouldRefreshToken([]*ecdsa.PublicKey{&key1.PublicKey, &key2.PublicKey}, []*ecdsa.PublicKey{&key2.PublicKey, &key1.PublicKey}, false, true))
}

func (s *ClientSuite) TestHandleMessageScheduledFromPairedDevice() {
	messageID := []byte("message-id")
	installationID1 := "1"

	// Should return nil
	response, err := s.client.shouldNotifyOn(&s.identity.PublicKey, installationID1, messageID)
	s.Require().NoError(err)
	s.Require().False(response)
}