messenger_handler.go

package protocol

import (
	"context"
	"crypto/ecdsa"
	"encoding/hex"
	"fmt"
	"log"

	"github.com/pkg/errors"
	"go.uber.org/zap"

	"github.com/status-im/status-go/eth-node/crypto"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/images"
	"github.com/status-im/status-go/multiaccounts/accounts"
	"github.com/status-im/status-go/multiaccounts/settings"
	"github.com/status-im/status-go/protocol/common"
	"github.com/status-im/status-go/protocol/communities"
	"github.com/status-im/status-go/protocol/encryption/multidevice"
	"github.com/status-im/status-go/protocol/protobuf"
	v1protocol "github.com/status-im/status-go/protocol/v1"
	localnotifications "github.com/status-im/status-go/services/local-notifications"
	"github.com/status-im/status-go/signal"
)

const (
	transactionRequestDeclinedMessage           = "Transaction request declined"
	requestAddressForTransactionAcceptedMessage = "Request address for transaction accepted"
	requestAddressForTransactionDeclinedMessage = "Request address for transaction declined"
)

var ErrMessageNotAllowed = errors.New("message from a non-contact")
var ErrMessageForWrongChatType = errors.New("message for the wrong chat type")

// HandleMembershipUpdate updates a Chat instance according to the membership updates.
// It retrieves chat, if exists, and merges membership updates from the message.
// Finally, the Chat is updated with the new group events.
func (m *Messenger) HandleMembershipUpdate(messageState *ReceivedMessageState, chat *Chat, rawMembershipUpdate protobuf.MembershipUpdateMessage, translations *systemMessageTranslationsMap) error {
	var group *v1protocol.Group
	var err error

	logger := m.logger.With(zap.String("site", "HandleMembershipUpdate"))

	message, err := v1protocol.MembershipUpdateMessageFromProtobuf(&rawMembershipUpdate)
	if err != nil {
		return err

	}

	if err := ValidateMembershipUpdateMessage(message, messageState.Timesource.GetCurrentTime()); err != nil {
		logger.Warn("failed to validate message", zap.Error(err))
		return err
	}

	senderID := messageState.CurrentMessageState.Contact.ID
	allowed, err := m.isMessageAllowedFrom(senderID, chat)
	if err != nil {
		return err
	}

	if !allowed {
		return ErrMessageNotAllowed
	}

	//if chat.InvitationAdmin exists means we are waiting for invitation request approvement, and in that case
	//we need to create a new chat instance like we don't have a chat and just use a regular invitation flow
	waitingForApproval := chat != nil && len(chat.InvitationAdmin) > 0
	ourKey := contactIDFromPublicKey(&m.identity.PublicKey)
	isActive := messageState.CurrentMessageState.Contact.Added || messageState.CurrentMessageState.Contact.ID == ourKey || waitingForApproval
	showPushNotification := isActive && messageState.CurrentMessageState.Contact.ID != ourKey

	// wasUserAdded indicates whether the user has been added to the group with this update
	wasUserAdded := false
	if chat == nil || waitingForApproval {
		if len(message.Events) == 0 {
			return errors.New("can't create new group chat without events")
		}

		//approve invitations
		if waitingForApproval {

			groupChatInvitation := &GroupChatInvitation{
				GroupChatInvitation: protobuf.GroupChatInvitation{
					ChatId: message.ChatID,
				},
				From: types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey)),
			}

			groupChatInvitation, err = m.persistence.InvitationByID(groupChatInvitation.ID())
			if err != nil && err != common.ErrRecordNotFound {
				return err
			}
			if groupChatInvitation != nil {
				groupChatInvitation.State = protobuf.GroupChatInvitation_APPROVED

				err := m.persistence.SaveInvitation(groupChatInvitation)
				if err != nil {
					return err
				}
				messageState.GroupChatInvitations[groupChatInvitation.ID()] = groupChatInvitation
			}
		}

		group, err = v1protocol.NewGroupWithEvents(message.ChatID, message.Events)
		if err != nil {
			return err
		}

		// A new chat must contain us
		if !group.IsMember(ourKey) {
			return errors.New("can't create a new group chat without us being a member")
		}
		// A new chat always adds us
		wasUserAdded = true
		newChat := CreateGroupChat(messageState.Timesource)
		// We set group chat inactive and create a notification instead
		// unless is coming from us or a contact or were waiting for approval
		newChat.Active = isActive
		newChat.ReceivedInvitationAdmin = senderID
		chat = &newChat

		chat.updateChatFromGroupMembershipChanges(group)

		if err != nil {
			return errors.Wrap(err, "failed to get group creator")
		}

	} else {
		existingGroup, err := newProtocolGroupFromChat(chat)
		if err != nil {
			return errors.Wrap(err, "failed to create a Group from Chat")
		}
		updateGroup, err := v1protocol.NewGroupWithEvents(message.ChatID, message.Events)
		if err != nil {
			return errors.Wrap(err, "invalid membership update")
		}
		merged := v1protocol.MergeMembershipUpdateEvents(existingGroup.Events(), updateGroup.Events())
		group, err = v1protocol.NewGroupWithEvents(chat.ID, merged)
		if err != nil {
			return errors.Wrap(err, "failed to create a group with new membership updates")
		}
		chat.updateChatFromGroupMembershipChanges(group)

		wasUserAdded = !existingGroup.IsMember(ourKey) &&
			updateGroup.IsMember(ourKey)

		// Reactivate deleted group chat on re-invite from contact
		chat.Active = chat.Active || (isActive && wasUserAdded)

		// Show push notifications when our key is added to members list and chat is Active
		showPushNotification = showPushNotification && wasUserAdded
	}

	// Only create a message notification when the user is added, not when removed
	if !chat.Active && wasUserAdded {
		chat.Highlight = true
		m.createMessageNotification(chat, messageState)
	}

	profilePicturesVisibility, err := m.settings.GetProfilePicturesVisibility()
	if err != nil {
		return errors.Wrap(err, "failed to get profilePicturesVisibility setting")
	}

	if showPushNotification {
		// chat is highlighted for new group invites or group re-invites
		chat.Highlight = true
		messageState.Response.AddNotification(NewPrivateGroupInviteNotification(chat.ID, chat, messageState.CurrentMessageState.Contact, profilePicturesVisibility))
	}

	systemMessages := buildSystemMessages(message.Events, translations)

	for _, message := range systemMessages {
		messageID := message.ID
		exists, err := m.messageExists(messageID, messageState.ExistingMessagesMap)
		if err != nil {
			m.logger.Warn("failed to check message exists", zap.Error(err))
		}
		if exists {
			continue
		}
		messageState.Response.AddMessage(message)
	}

	messageState.Response.AddChat(chat)
	// Store in chats map as it might be a new one
	messageState.AllChats.Store(chat.ID, chat)

	if waitingForApproval {
		_, err = m.ConfirmJoiningGroup(context.Background(), chat.ID)
		if err != nil {
			return err
		}
	}

	if message.Message != nil {
		messageState.CurrentMessageState.Message = *message.Message
		return m.HandleChatMessage(messageState)
	} else if message.EmojiReaction != nil {
		return m.HandleEmojiReaction(messageState, *message.EmojiReaction)
	}

	return nil
}

func (m *Messenger) createMessageNotification(chat *Chat, messageState *ReceivedMessageState) {

	var notificationType ActivityCenterType
	if chat.OneToOne() {
		notificationType = ActivityCenterNotificationTypeNewOneToOne
	} else {
		notificationType = ActivityCenterNotificationTypeNewPrivateGroupChat
	}
	notification := &ActivityCenterNotification{
		ID:          types.FromHex(chat.ID),
		Name:        chat.Name,
		LastMessage: chat.LastMessage,
		Type:        notificationType,
		Author:      messageState.CurrentMessageState.Contact.ID,
		Timestamp:   messageState.CurrentMessageState.WhisperTimestamp,
		ChatID:      chat.ID,
	}

	err := m.addActivityCenterNotification(messageState, notification)
	if err != nil {
		m.logger.Warn("failed to create activity center notification", zap.Error(err))
	}
}

func (m *Messenger) createContactRequestNotification(contact *Contact, messageState *ReceivedMessageState, contactRequest *common.Message) error {

	// Legacy contact request
	if contactRequest == nil {

		if messageState.CurrentMessageState == nil || messageState.CurrentMessageState.MessageID == "" {
			return errors.New("no available id")
		}
		contactRequest = &common.Message{}

		contactRequest.WhisperTimestamp = messageState.CurrentMessageState.WhisperTimestamp
		contactRequest.Seen = true
		contactRequest.Text = "Please add me to your contacts"
		contactRequest.From = contact.ID
		contactRequest.ContentType = protobuf.ChatMessage_CONTACT_REQUEST
		contactRequest.Clock = messageState.CurrentMessageState.Message.Clock
		contactRequest.ID = messageState.CurrentMessageState.MessageID
		contactRequest.ContactRequestState = common.ContactRequestStatePending
		err := contactRequest.PrepareContent(common.PubkeyToHex(&m.identity.PublicKey))
		if err != nil {
			return err
		}

		messageState.Response.AddMessage(contactRequest)

		err = m.persistence.SaveMessages([]*common.Message{contactRequest})
		if err != nil {
			return err
		}

	}

	notification := &ActivityCenterNotification{
		ID:        types.FromHex(contactRequest.ID),
		Name:      contact.CanonicalName(),
		Message:   contactRequest,
		Type:      ActivityCenterNotificationTypeContactRequest,
		Author:    messageState.CurrentMessageState.Contact.ID,
		Timestamp: messageState.CurrentMessageState.WhisperTimestamp,
		ChatID:    contact.ID,
	}

	return m.addActivityCenterNotification(messageState, notification)
}

func (m *Messenger) handleCommandMessage(state *ReceivedMessageState, message *common.Message) error {
	message.ID = state.CurrentMessageState.MessageID
	message.From = state.CurrentMessageState.Contact.ID
	message.Alias = state.CurrentMessageState.Contact.Alias
	message.SigPubKey = state.CurrentMessageState.PublicKey
	message.Identicon = state.CurrentMessageState.Contact.Identicon
	message.WhisperTimestamp = state.CurrentMessageState.WhisperTimestamp

	if err := message.PrepareContent(common.PubkeyToHex(&m.identity.PublicKey)); err != nil {
		return fmt.Errorf("failed to prepare content: %v", err)
	}
	chat, err := m.matchChatEntity(message)
	if err != nil {
		return err
	}

	allowed, err := m.isMessageAllowedFrom(state.CurrentMessageState.Contact.ID, chat)
	if err != nil {
		return err
	}

	if !allowed {
		return ErrMessageNotAllowed
	}

	// If deleted-at is greater, ignore message
	if chat.DeletedAtClockValue >= message.Clock {
		return nil
	}

	// Set the LocalChatID for the message
	message.LocalChatID = chat.ID

	if c, ok := state.AllChats.Load(chat.ID); ok {
		chat = c
	}

	// Set the LocalChatID for the message
	message.LocalChatID = chat.ID

	// Increase unviewed count
	if !common.IsPubKeyEqual(message.SigPubKey, &m.identity.PublicKey) {
		m.updateUnviewedCounts(chat, message.Mentioned)
		message.OutgoingStatus = ""
	} else {
		// Our own message, mark as sent
		message.OutgoingStatus = common.OutgoingStatusSent
	}

	err = chat.UpdateFromMessage(message, state.Timesource)
	if err != nil {
		return err
	}

	if !chat.Active {
		m.createMessageNotification(chat, state)
	}

	// Add to response
	state.Response.AddChat(chat)
	if message != nil {
		message.New = true
		state.Response.AddMessage(message)
	}

	// Set in the modified maps chat
	state.AllChats.Store(chat.ID, chat)

	return nil
}

func (m *Messenger) HandleBackup(state *ReceivedMessageState, message protobuf.Backup) error {
	for _, contact := range message.Contacts {
		err := m.HandleSyncInstallationContact(state, *contact)
		if err != nil {
			return err
		}
	}

	for _, community := range message.Communities {
		err := m.handleSyncCommunity(state, *community)
		if err != nil {
			return err
		}
	}

	return nil
}

func (m *Messenger) HandleSyncInstallationContact(state *ReceivedMessageState, message protobuf.SyncInstallationContactV2) error {
	removedOrBlcoked := message.Removed || message.Blocked
	chat, ok := state.AllChats.Load(message.Id)
	if !ok && (message.Added || message.Muted) && !removedOrBlcoked {
		pubKey, err := common.HexToPubkey(message.Id)
		if err != nil {
			return err
		}

		chat = OneToOneFromPublicKey(pubKey, state.Timesource)
		// We don't want to show the chat to the user
		chat.Active = false
	}

	contact, ok := state.AllContacts.Load(message.Id)
	if !ok {
		if message.Removed {
			// Nothing to do in case if contact doesn't exist
			return nil
		}

		var err error
		contact, err = buildContactFromPkString(message.Id)
		if err != nil {
			return err
		}
	}

	if contact.LastUpdated < message.LastUpdated {
		contact.HasAddedUs = message.HasAddedUs
	}

	if contact.LastUpdatedLocally < message.LastUpdatedLocally {
		contact.IsSyncing = true
		defer func() {
			contact.IsSyncing = false
		}()

		if message.Added {
			contact.Added = true
		}
		if message.EnsName != "" && contact.EnsName != message.EnsName {
			contact.EnsName = message.EnsName
			publicKey, err := contact.PublicKey()
			if err != nil {
				return err
			}

			err = m.ENSVerified(common.PubkeyToHex(publicKey), message.EnsName)
			if err != nil {
				contact.ENSVerified = false
			}
			contact.ENSVerified = true
		}
		contact.LastUpdatedLocally = message.LastUpdatedLocally
		contact.LocalNickname = message.LocalNickname

		if message.Blocked != contact.Blocked {
			if message.Blocked {
				state.AllContacts.Store(contact.ID, contact)
				response, err := m.BlockContact(contact.ID)
				if err != nil {
					return err
				}
				err = state.Response.Merge(response)
				if err != nil {
					return err
				}
			} else {
				contact.Unblock()
			}
		}
		if chat != nil && message.Muted != chat.Muted {
			if message.Muted {
				err := m.muteChat(chat, contact)
				if err != nil {
					return err
				}
			} else {
				err := m.unmuteChat(chat, contact)
				if err != nil {
					return err
				}
			}

			state.Response.AddChat(chat)
		}

		if message.Removed {
			err := m.removeContact(context.Background(), state.Response, contact.ID)
			if err != nil {
				return err
			}
		}

		state.ModifiedContacts.Store(contact.ID, true)
		state.AllContacts.Store(contact.ID, contact)
	}

	if chat != nil {
		state.AllChats.Store(chat.ID, chat)
	}

	return nil
}

func (m *Messenger) HandleSyncProfilePictures(state *ReceivedMessageState, message protobuf.SyncProfilePictures) error {
	dbImages, err := m.multiAccounts.GetIdentityImages(message.KeyUid)
	if err != nil {
		return err
	}
	dbImageMap := make(map[string]*images.IdentityImage)
	for _, img := range dbImages {
		dbImageMap[img.Name] = img
	}
	idImages := make([]*images.IdentityImage, len(message.Pictures))
	i := 0
	for _, message := range message.Pictures {
		dbImg := dbImageMap[message.Name]
		if dbImg != nil && message.Clock <= dbImg.Clock {
			continue
		}
		image := &images.IdentityImage{
			Name:         message.Name,
			Payload:      message.Payload,
			Width:        int(message.Width),
			Height:       int(message.Height),
			FileSize:     int(message.FileSize),
			ResizeTarget: int(message.ResizeTarget),
			Clock:        message.Clock,
		}
		idImages[i] = image
		i++
	}

	if i == 0 {
		return nil
	}

	err = m.multiAccounts.StoreIdentityImages(message.KeyUid, idImages[:i], false)
	if err == nil {
		state.Response.IdentityImages = idImages[:i]
	}
	return err
}

func (m *Messenger) HandleSyncInstallationPublicChat(state *ReceivedMessageState, message protobuf.SyncInstallationPublicChat) *Chat {
	chatID := message.Id
	existingChat, ok := state.AllChats.Load(chatID)
	if ok && (existingChat.Active || uint32(message.GetClock()/1000) < existingChat.SyncedTo) {
		return nil
	}

	chat := existingChat
	if !ok {
		chat = CreatePublicChat(chatID, state.Timesource)
		chat.Joined = int64(message.Clock)
	} else {
		existingChat.Joined = int64(message.Clock)
	}

	state.AllChats.Store(chat.ID, chat)

	state.Response.AddChat(chat)
	return chat
}

func (m *Messenger) HandleSyncChatRemoved(state *ReceivedMessageState, message protobuf.SyncChatRemoved) error {
	chat, ok := m.allChats.Load(message.Id)
	if !ok {
		return ErrChatNotFound
	}

	if chat.Joined > int64(message.Clock) {
		return nil
	}

	if chat.PrivateGroupChat() {
		_, err := m.leaveGroupChat(context.Background(), state.Response, message.Id, true, false)
		if err != nil {
			return err
		}
	}

	response, err := m.deactivateChat(message.Id, message.Clock, false)
	if err != nil {
		return err
	}

	return state.Response.Merge(response)
}

func (m *Messenger) HandleSyncChatMessagesRead(state *ReceivedMessageState, message protobuf.SyncChatMessagesRead) error {
	m.logger.Info("HANDLING SYNC MESSAGES READ", zap.Any("ID", message.Id))
	chat, ok := m.allChats.Load(message.Id)
	if !ok {
		return ErrChatNotFound
	}

	if chat.ReadMessagesAtClockValue > message.Clock {
		return nil
	}

	err := m.markAllRead(message.Id, message.Clock, false)
	if err != nil {
		return err
	}

	state.Response.AddChat(chat)
	return nil
}

func (m *Messenger) HandlePinMessage(state *ReceivedMessageState, message protobuf.PinMessage) error {
	logger := m.logger.With(zap.String("site", "HandlePinMessage"))

	logger.Info("Handling pin message")

	pinMessage := &common.PinMessage{
		PinMessage: message,
		// MessageID:        message.MessageId,
		WhisperTimestamp: state.CurrentMessageState.WhisperTimestamp,
		From:             state.CurrentMessageState.Contact.ID,
		SigPubKey:        state.CurrentMessageState.PublicKey,
		Identicon:        state.CurrentMessageState.Contact.Identicon,
		Alias:            state.CurrentMessageState.Contact.Alias,
	}

	chat, err := m.matchChatEntity(pinMessage)
	if err != nil {
		return err // matchChatEntity returns a descriptive error message
	}

	pinMessage.ID, err = generatePinMessageID(&m.identity.PublicKey, pinMessage, chat)
	if err != nil {
		return err
	}

	// If deleted-at is greater, ignore message
	if chat.DeletedAtClockValue >= pinMessage.Clock {
		return nil
	}

	// Set the LocalChatID for the message
	pinMessage.LocalChatID = chat.ID

	if c, ok := state.AllChats.Load(chat.ID); ok {
		chat = c
	}

	// Set the LocalChatID for the message
	pinMessage.LocalChatID = chat.ID

	if chat.LastClockValue < message.Clock {
		chat.LastClockValue = message.Clock
	}

	state.Response.AddPinMessage(pinMessage)

	// Set in the modified maps chat
	state.Response.AddChat(chat)
	state.AllChats.Store(chat.ID, chat)

	return nil
}

func (m *Messenger) HandleAcceptContactRequest(state *ReceivedMessageState, message protobuf.AcceptContactRequest) error {
	contact := state.CurrentMessageState.Contact

	if contact.ContactRequestClock > message.Clock {
		m.logger.Info("not handling accept since clock lower")
		return nil
	}

	// TODO: Handle missing contact request message
	request, err := m.persistence.MessageByID(message.Id)
	if err != nil {
		return err
	}

	if request.LocalChatID != state.CurrentMessageState.Contact.ID {
		return errors.New("can't accept contact request not sent to user")
	}

	contact.ContactRequestClock = message.Clock

	state.ModifiedContacts.Store(contact.ID, true)
	state.AllContacts.Store(contact.ID, contact)

	request.ContactRequestState = common.ContactRequestStateAccepted

	err = m.persistence.SetContactRequestState(request.ID, request.ContactRequestState)
	if err != nil {
		return err
	}

	err = m.createContactRequestNotification(state.CurrentMessageState.Contact, state, request)
	if err != nil {
		m.logger.Warn("could not create contact request notification", zap.Error(err))
	}

	state.CurrentMessageState.Contact.ContactRequestAccepted()

	state.Response.AddMessage(request)
	return nil

}

func (m *Messenger) HandleRetractContactRequest(state *ReceivedMessageState, message protobuf.RetractContactRequest) error {
	contact := state.CurrentMessageState.Contact
	if contact.ContactRequestClock > message.Clock {
		m.logger.Info("not handling retract since clock lower")
		return nil
	}

	contact.Added = false
	contact.HasAddedUs = false
	contact.ContactRequestClock = message.Clock
	contact.ContactRequestRetracted()
	state.ModifiedContacts.Store(contact.ID, true)

	state.AllContacts.Store(contact.ID, contact)

	return nil
}

func (m *Messenger) HandleContactUpdate(state *ReceivedMessageState, message protobuf.ContactUpdate) error {
	logger := m.logger.With(zap.String("site", "HandleContactUpdate"))
	contact := state.CurrentMessageState.Contact
	chat, ok := state.AllChats.Load(contact.ID)

	allowed, err := m.isMessageAllowedFrom(state.CurrentMessageState.Contact.ID, chat)
	if err != nil {
		return err
	}
	if !allowed {
		return ErrMessageNotAllowed
	}

	if err = ValidateDisplayName(&message.DisplayName); err != nil {
		return err
	}

	if !ok {
		chat = OneToOneFromPublicKey(state.CurrentMessageState.PublicKey, state.Timesource)
		// We don't want to show the chat to the user
		chat.Active = false
	}

	logger.Info("Handling contact update")

	if contact.LastUpdated < message.Clock {
		logger.Info("Updating contact")
		if contact.EnsName != message.EnsName {
			contact.EnsName = message.EnsName
			contact.ENSVerified = false
		}

		if len(message.DisplayName) != 0 {
			contact.DisplayName = message.DisplayName
		}

		contact.HasAddedUs = true
		contact.LastUpdated = message.Clock
		state.ModifiedContacts.Store(contact.ID, true)
		state.AllContacts.Store(contact.ID, contact)
		/* Disabling for now in order to avoid duplicated contact requests in activity center
		if contact.ContactRequestState == ContactRequestStateNone {
			contact.ContactRequestState = ContactRequestStateReceived
			err = m.createContactRequestNotification(contact, state, nil)
			if err != nil {
				m.logger.Warn("could not create contact request notification", zap.Error(err))
			}

		}*/
	}

	if chat.LastClockValue < message.Clock {
		chat.LastClockValue = message.Clock
	}

	state.Response.AddChat(chat)
	// TODO(samyoul) remove storing of an updated reference pointer?
	state.AllChats.Store(chat.ID, chat)

	return nil
}

func (m *Messenger) HandlePairInstallation(state *ReceivedMessageState, message protobuf.PairInstallation) error {
	logger := m.logger.With(zap.String("site", "HandlePairInstallation"))
	if err := ValidateReceivedPairInstallation(&message, state.CurrentMessageState.WhisperTimestamp); err != nil {
		logger.Warn("failed to validate message", zap.Error(err))
		return err
	}

	installation, ok := state.AllInstallations.Load(message.InstallationId)
	if !ok {
		return errors.New("installation not found")
	}

	metadata := &multidevice.InstallationMetadata{
		Name:       message.Name,
		DeviceType: message.DeviceType,
	}

	installation.InstallationMetadata = metadata
	// TODO(samyoul) remove storing of an updated reference pointer?
	state.AllInstallations.Store(message.InstallationId, installation)
	state.ModifiedInstallations.Store(message.InstallationId, true)

	return nil
}

// HandleCommunityInvitation handles an community invitation
func (m *Messenger) HandleCommunityInvitation(state *ReceivedMessageState, signer *ecdsa.PublicKey, invitation protobuf.CommunityInvitation, rawPayload []byte) error {
	if invitation.PublicKey == nil {
		return errors.New("invalid pubkey")
	}
	pk, err := crypto.DecompressPubkey(invitation.PublicKey)
	if err != nil {
		return err
	}

	if !common.IsPubKeyEqual(pk, &m.identity.PublicKey) {
		return errors.New("invitation not for us")
	}

	communityResponse, err := m.communitiesManager.HandleCommunityInvitation(signer, &invitation, rawPayload)
	if err != nil {
		return err
	}

	community := communityResponse.Community

	state.Response.AddCommunity(community)
	state.Response.CommunityChanges = append(state.Response.CommunityChanges, communityResponse.Changes)

	return nil
}

func (m *Messenger) HandleHistoryArchiveMagnetlinkMessage(state *ReceivedMessageState, communityPubKey *ecdsa.PublicKey, magnetlink string, clock uint64) error {

	id := types.HexBytes(crypto.CompressPubkey(communityPubKey))
	settings, err := m.communitiesManager.GetCommunitySettingsByID(id)
	if err != nil {
		m.logger.Debug("Couldn't get community settings for community with id: ", zap.Any("id", id))
		return err
	}

	if m.config.torrentConfig != nil && m.config.torrentConfig.Enabled && settings != nil && settings.HistoryArchiveSupportEnabled {
		signedByOwnedCommunity, err := m.communitiesManager.IsAdminCommunity(communityPubKey)
		if err != nil {
			return err
		}
		joinedCommunity, err := m.communitiesManager.IsJoinedCommunity(communityPubKey)
		if err != nil {
			return err
		}
		lastClock, err := m.communitiesManager.GetMagnetlinkMessageClock(id)
		if err != nil {
			return err
		}
		// We are only interested in a community archive magnet link
		// if it originates from a community that the current account is
		// part of and doesn't own the private key at the same time
		if !signedByOwnedCommunity && joinedCommunity && clock >= lastClock {

			m.communitiesManager.UnseedHistoryArchiveTorrent(id)
			m.downloadHistoryArchiveTasksWaitGroup.Add(1)
			go func() {
				downloadedArchiveIDs, err := m.communitiesManager.DownloadHistoryArchivesByMagnetlink(id, magnetlink)
				if err != nil {
					log.Println("failed to download history archive data", err)
					m.logger.Debug("failed to download history archive data", zap.Error(err))
					return
				}

				messagesToHandle, err := m.communitiesManager.ExtractMessagesFromHistoryArchives(id, downloadedArchiveIDs)
				if err != nil {
					log.Println("failed to extract history archive messages", err)
					m.logger.Debug("failed to extract history archive messages", zap.Error(err))
					return
				}

				response, err := m.handleRetrievedMessages(messagesToHandle, false)
				if err != nil {
					log.Println("failed to write history archive messages to database", err)
					m.logger.Debug("failed to write history archive messages to database", zap.Error(err))
				}
				m.downloadHistoryArchiveTasksWaitGroup.Done()
				if !response.IsEmpty() {
					notifications := response.Notifications()
					response.ClearNotifications()
					signal.SendNewMessages(response)
					localnotifications.PushMessages(notifications)
				}
			}()

			return m.communitiesManager.UpdateMagnetlinkMessageClock(id, clock)
		}
	}
	return nil
}

// HandleCommunityRequestToJoin handles an community request to join
func (m *Messenger) HandleCommunityRequestToJoin(state *ReceivedMessageState, signer *ecdsa.PublicKey, requestToJoinProto protobuf.CommunityRequestToJoin) error {
	if requestToJoinProto.CommunityId == nil {
		return errors.New("invalid community id")
	}

	requestToJoin, err := m.communitiesManager.HandleCommunityRequestToJoin(signer, &requestToJoinProto)
	if err != nil {
		return err
	}

	state.Response.RequestsToJoinCommunity = append(state.Response.RequestsToJoinCommunity, requestToJoin)

	community, err := m.communitiesManager.GetByID(requestToJoinProto.CommunityId)
	if err != nil {
		return err
	}

	contactID := contactIDFromPublicKey(signer)

	contact, _ := state.AllContacts.Load(contactID)

	state.Response.AddNotification(NewCommunityRequestToJoinNotification(requestToJoin.ID.String(), community, contact))

	return nil
}

// handleWrappedCommunityDescriptionMessage handles a wrapped community description
func (m *Messenger) handleWrappedCommunityDescriptionMessage(payload []byte) (*communities.CommunityResponse, error) {
	return m.communitiesManager.HandleWrappedCommunityDescriptionMessage(payload)
}

func (m *Messenger) HandleEditMessage(response *MessengerResponse, editMessage EditMessage) error {
	if err := ValidateEditMessage(editMessage.EditMessage); err != nil {
		return err
	}
	messageID := editMessage.MessageId
	// Check if it's already in the response
	originalMessage := response.GetMessage(messageID)
	// otherwise pull from database
	if originalMessage == nil {
		var err error
		originalMessage, err = m.persistence.MessageByID(messageID)

		if err != nil && err != common.ErrRecordNotFound {
			return err
		}
	}

	// We don't have the original message, save the edited message
	if originalMessage == nil {
		return m.persistence.SaveEdit(editMessage)
	}

	chat, ok := m.allChats.Load(originalMessage.LocalChatID)
	if !ok {
		return errors.New("chat not found")
	}

	// Check edit is valid
	if originalMessage.From != editMessage.From {
		return errors.New("invalid edit, not the right author")
	}

	// Check that edit should be applied
	if originalMessage.EditedAt >= editMessage.Clock {
		return m.persistence.SaveEdit(editMessage)
	}

	// Update message and return it
	err := m.applyEditMessage(&editMessage.EditMessage, originalMessage)
	if err != nil {
		return err
	}

	if chat.LastMessage != nil && chat.LastMessage.ID == originalMessage.ID {
		chat.LastMessage = originalMessage
		err := m.saveChat(chat)
		if err != nil {
			return err
		}
	}
	response.AddMessage(originalMessage)
	response.AddChat(chat)

	return nil
}

func (m *Messenger) HandleDeleteMessage(state *ReceivedMessageState, deleteMessage DeleteMessage) error {
	if err := ValidateDeleteMessage(deleteMessage.DeleteMessage); err != nil {
		return err
	}

	messageID := deleteMessage.MessageId
	// Check if it's already in the response
	originalMessage := state.Response.GetMessage(messageID)
	// otherwise pull from database
	if originalMessage == nil {
		var err error
		originalMessage, err = m.persistence.MessageByID(messageID)

		if err != nil && err != common.ErrRecordNotFound {
			return err
		}
	}

	if originalMessage == nil {
		return m.persistence.SaveDelete(deleteMessage)
	}

	chat, ok := m.allChats.Load(originalMessage.LocalChatID)
	if !ok {
		return errors.New("chat not found")
	}

	// Check edit is valid
	if originalMessage.From != deleteMessage.From {
		return errors.New("invalid delete, not the right author")
	}

	// Update message and return it
	originalMessage.Deleted = true

	err := m.persistence.SaveMessages([]*common.Message{originalMessage})
	if err != nil {
		return err
	}

	err = m.persistence.SetHideOnMessage(deleteMessage.MessageId)
	if err != nil {
		return err
	}

	m.logger.Debug("deleting activity center notification for message", zap.String("chatID", chat.ID), zap.String("messageID", deleteMessage.MessageId))
	err = m.persistence.DeleteActivityCenterNotificationForMessage(chat.ID, deleteMessage.MessageId)

	if err != nil {
		m.logger.Warn("failed to delete notifications for deleted message", zap.Error(err))
		return err
	}

	if chat.LastMessage != nil && chat.LastMessage.ID == originalMessage.ID {
		if err := m.updateLastMessage(chat); err != nil {
			return err
		}
	}

	state.Response.AddRemovedMessage(&RemovedMessage{MessageID: messageID, ChatID: chat.ID})
	state.Response.AddChat(chat)
	state.Response.AddNotification(DeletedMessageNotification(messageID, chat))

	return nil
}

func (m *Messenger) updateLastMessage(chat *Chat) error {
	// Get last message that is not hidden
	messages, _, err := m.persistence.MessageByChatID(chat.ID, "", 1)
	if err != nil {
		return err
	}
	if len(messages) > 0 {
		chat.LastMessage = messages[0]
	} else {
		chat.LastMessage = nil
	}

	return m.saveChat(chat)
}

func (m *Messenger) HandleChatMessage(state *ReceivedMessageState) error {
	logger := m.logger.With(zap.String("site", "handleChatMessage"))
	if err := ValidateReceivedChatMessage(&state.CurrentMessageState.Message, state.CurrentMessageState.WhisperTimestamp); err != nil {
		logger.Warn("failed to validate message", zap.Error(err))
		return err
	}
	receivedMessage := &common.Message{
		ID:               state.CurrentMessageState.MessageID,
		ChatMessage:      state.CurrentMessageState.Message,
		From:             state.CurrentMessageState.Contact.ID,
		Alias:            state.CurrentMessageState.Contact.Alias,
		SigPubKey:        state.CurrentMessageState.PublicKey,
		Identicon:        state.CurrentMessageState.Contact.Identicon,
		WhisperTimestamp: state.CurrentMessageState.WhisperTimestamp,
	}

	if common.IsPubKeyEqual(state.CurrentMessageState.PublicKey, &m.identity.PublicKey) {
		receivedMessage.Seen = true
	}

	err := receivedMessage.PrepareContent(common.PubkeyToHex(&m.identity.PublicKey))
	if err != nil {
		return fmt.Errorf("failed to prepare message content: %v", err)
	}
	chat, err := m.matchChatEntity(receivedMessage)
	if err != nil {
		return err // matchChatEntity returns a descriptive error message
	}

	if chat.ReadMessagesAtClockValue > state.CurrentMessageState.WhisperTimestamp {
		receivedMessage.Seen = true
	}

	allowed, err := m.isMessageAllowedFrom(state.CurrentMessageState.Contact.ID, chat)
	if err != nil {
		return err
	}

	if !allowed {
		return ErrMessageNotAllowed
	}

	// It looks like status-react created profile chats as public chats
	// so for now we need to check for the presence of "@" in their chatID
	if chat.Public() && !chat.ProfileUpdates() {
		switch receivedMessage.ContentType {
		case protobuf.ChatMessage_IMAGE:
			return errors.New("images are not allowed in public chats")
		case protobuf.ChatMessage_AUDIO:
			return errors.New("audio messages are not allowed in public chats")
		}
	}

	// If profile updates check if author is the same as chat profile public key
	if chat.ProfileUpdates() && receivedMessage.From != chat.Profile {
		return nil
	}

	// If deleted-at is greater, ignore message
	if chat.DeletedAtClockValue >= receivedMessage.Clock {
		return nil
	}

	// Set the LocalChatID for the message
	receivedMessage.LocalChatID = chat.ID

	if c, ok := m.allChats.Load(chat.ID); ok {
		chat = c
	}

	// Set the LocalChatID for the message
	receivedMessage.LocalChatID = chat.ID

	// Increase unviewed count
	if !common.IsPubKeyEqual(receivedMessage.SigPubKey, &m.identity.PublicKey) {
		if !receivedMessage.Seen {
			m.updateUnviewedCounts(chat, receivedMessage.Mentioned)
		}
	} else {
		// Our own message, mark as sent
		receivedMessage.OutgoingStatus = common.OutgoingStatusSent
	}

	contact := state.CurrentMessageState.Contact

	if receivedMessage.ContentType == protobuf.ChatMessage_CONTACT_REQUEST {
		if contact.ContactRequestClock > receivedMessage.Clock {
			m.logger.Info("not handling contact message since clock lower")
			return nil
		}
		receivedMessage.ContactRequestState = common.ContactRequestStatePending
		contact.ContactRequestClock = receivedMessage.Clock
		contact.ContactRequestReceived()
		state.ModifiedContacts.Store(contact.ID, true)
		state.AllContacts.Store(contact.ID, contact)
		err = m.createContactRequestNotification(state.CurrentMessageState.Contact, state, receivedMessage)
		if err != nil {
			return err
		}

	} else if receivedMessage.ContentType == protobuf.ChatMessage_COMMUNITY {
		chat.Highlight = true
	}

	err = m.checkForEdits(receivedMessage)
	if err != nil {
		return err
	}

	err = m.checkForDeletes(receivedMessage)
	if err != nil {
		return err
	}

	if receivedMessage.Deleted && (chat.LastMessage == nil || chat.LastMessage.ID == receivedMessage.ID) {
		// Get last message that is not hidden
		messages, _, err := m.persistence.MessageByChatID(receivedMessage.LocalChatID, "", 1)
		if err != nil {
			return err
		}
		if len(messages) != 0 {
			chat.LastMessage = messages[0]
		} else {
			chat.LastMessage = nil
		}
	} else {
		err = chat.UpdateFromMessage(receivedMessage, m.getTimesource())
		if err != nil {
			return err
		}
	}

	// If the chat is not active, create a notification in the center
	if !receivedMessage.Deleted && chat.OneToOne() && !chat.Active && receivedMessage.ContentType != protobuf.ChatMessage_CONTACT_REQUEST {
		m.createMessageNotification(chat, state)
	}

	// Set in the modified maps chat
	state.Response.AddChat(chat)
	// TODO(samyoul) remove storing of an updated reference pointer?
	m.allChats.Store(chat.ID, chat)

	if receivedMessage.EnsName != "" {
		oldRecord, err := m.ensVerifier.Add(contact.ID, receivedMessage.EnsName, receivedMessage.Clock)
		if err != nil {
			m.logger.Warn("failed to verify ENS name", zap.Error(err))
		} else if oldRecord == nil {
			// If oldRecord is nil, a new verification process will take place
			// so we reset the record
			contact.ENSVerified = false
			state.ModifiedContacts.Store(contact.ID, true)
			state.AllContacts.Store(contact.ID, contact)
		}
	}

	if contact.DisplayName != receivedMessage.DisplayName && len(receivedMessage.DisplayName) != 0 {
		contact.DisplayName = receivedMessage.DisplayName
		state.ModifiedContacts.Store(contact.ID, true)
	}

	if receivedMessage.ContentType == protobuf.ChatMessage_COMMUNITY {
		m.logger.Debug("Handling community content type")

		communityResponse, err := m.handleWrappedCommunityDescriptionMessage(receivedMessage.GetCommunity())
		if err != nil {
			return err
		}
		community := communityResponse.Community
		receivedMessage.CommunityID = community.IDString()

		state.Response.AddCommunity(community)
		state.Response.CommunityChanges = append(state.Response.CommunityChanges, communityResponse.Changes)
	}

	receivedMessage.New = true
	state.Response.AddMessage(receivedMessage)

	return nil
}

func (m *Messenger) addActivityCenterNotification(state *ReceivedMessageState, notification *ActivityCenterNotification) error {
	err := m.persistence.SaveActivityCenterNotification(notification)
	if err != nil {
		m.logger.Warn("failed to save notification", zap.Error(err))
		return err
	}
	state.Response.AddActivityCenterNotification(notification)
	return nil
}

func (m *Messenger) HandleRequestAddressForTransaction(messageState *ReceivedMessageState, command protobuf.RequestAddressForTransaction) error {
	err := ValidateReceivedRequestAddressForTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	message := &common.Message{
		ChatMessage: protobuf.ChatMessage{
			Clock:     command.Clock,
			Timestamp: messageState.CurrentMessageState.WhisperTimestamp,
			Text:      "Request address for transaction",
			// ChatId is only used as-is for messages sent to oneself (i.e: mostly sync) so no need to check it here
			ChatId:      command.GetChatId(),
			MessageType: protobuf.MessageType_ONE_TO_ONE,
			ContentType: protobuf.ChatMessage_TRANSACTION_COMMAND,
		},
		CommandParameters: &common.CommandParameters{
			ID:           messageState.CurrentMessageState.MessageID,
			Value:        command.Value,
			Contract:     command.Contract,
			CommandState: common.CommandStateRequestAddressForTransaction,
		},
	}
	return m.handleCommandMessage(messageState, message)
}

func (m *Messenger) HandleRequestTransaction(messageState *ReceivedMessageState, command protobuf.RequestTransaction) error {
	err := ValidateReceivedRequestTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	message := &common.Message{
		ChatMessage: protobuf.ChatMessage{
			Clock:     command.Clock,
			Timestamp: messageState.CurrentMessageState.WhisperTimestamp,
			Text:      "Request transaction",
			// ChatId is only used for messages sent to oneself (i.e: mostly sync) so no need to check it here
			ChatId:      command.GetChatId(),
			MessageType: protobuf.MessageType_ONE_TO_ONE,
			ContentType: protobuf.ChatMessage_TRANSACTION_COMMAND,
		},
		CommandParameters: &common.CommandParameters{
			ID:           messageState.CurrentMessageState.MessageID,
			Value:        command.Value,
			Contract:     command.Contract,
			CommandState: common.CommandStateRequestTransaction,
			Address:      command.Address,
		},
	}
	return m.handleCommandMessage(messageState, message)
}

func (m *Messenger) HandleAcceptRequestAddressForTransaction(messageState *ReceivedMessageState, command protobuf.AcceptRequestAddressForTransaction) error {
	err := ValidateReceivedAcceptRequestAddressForTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	initialMessage, err := m.persistence.MessageByID(command.Id)
	if err != nil {
		return err
	}
	if initialMessage == nil {
		return errors.New("message not found")
	}

	if initialMessage.LocalChatID != messageState.CurrentMessageState.Contact.ID {
		return errors.New("From must match")
	}

	if initialMessage.OutgoingStatus == "" {
		return errors.New("Initial message must originate from us")
	}

	if initialMessage.CommandParameters.CommandState != common.CommandStateRequestAddressForTransaction {
		return errors.New("Wrong state for command")
	}

	initialMessage.Clock = command.Clock
	initialMessage.Timestamp = messageState.CurrentMessageState.WhisperTimestamp
	initialMessage.Text = requestAddressForTransactionAcceptedMessage
	initialMessage.CommandParameters.Address = command.Address
	initialMessage.Seen = false
	initialMessage.CommandParameters.CommandState = common.CommandStateRequestAddressForTransactionAccepted
	initialMessage.ChatId = command.GetChatId()

	// Hide previous message
	previousMessage, err := m.persistence.MessageByCommandID(messageState.CurrentMessageState.Contact.ID, command.Id)
	if err != nil && err != common.ErrRecordNotFound {
		return err
	}

	if previousMessage != nil {
		err = m.persistence.HideMessage(previousMessage.ID)
		if err != nil {
			return err
		}

		initialMessage.Replace = previousMessage.ID
	}

	return m.handleCommandMessage(messageState, initialMessage)
}

func (m *Messenger) HandleSendTransaction(messageState *ReceivedMessageState, command protobuf.SendTransaction) error {
	err := ValidateReceivedSendTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	transactionToValidate := &TransactionToValidate{
		MessageID:       messageState.CurrentMessageState.MessageID,
		CommandID:       command.Id,
		TransactionHash: command.TransactionHash,
		FirstSeen:       messageState.CurrentMessageState.WhisperTimestamp,
		Signature:       command.Signature,
		Validate:        true,
		From:            messageState.CurrentMessageState.PublicKey,
		RetryCount:      0,
	}
	m.logger.Info("Saving transction to validate", zap.Any("transaction", transactionToValidate))

	return m.persistence.SaveTransactionToValidate(transactionToValidate)
}

func (m *Messenger) HandleDeclineRequestAddressForTransaction(messageState *ReceivedMessageState, command protobuf.DeclineRequestAddressForTransaction) error {
	err := ValidateReceivedDeclineRequestAddressForTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	oldMessage, err := m.persistence.MessageByID(command.Id)
	if err != nil {
		return err
	}
	if oldMessage == nil {
		return errors.New("message not found")
	}

	if oldMessage.LocalChatID != messageState.CurrentMessageState.Contact.ID {
		return errors.New("From must match")
	}

	if oldMessage.OutgoingStatus == "" {
		return errors.New("Initial message must originate from us")
	}

	if oldMessage.CommandParameters.CommandState != common.CommandStateRequestAddressForTransaction {
		return errors.New("Wrong state for command")
	}

	oldMessage.Clock = command.Clock
	oldMessage.Timestamp = messageState.CurrentMessageState.WhisperTimestamp
	oldMessage.Text = requestAddressForTransactionDeclinedMessage
	oldMessage.Seen = false
	oldMessage.CommandParameters.CommandState = common.CommandStateRequestAddressForTransactionDeclined
	oldMessage.ChatId = command.GetChatId()

	// Hide previous message
	err = m.persistence.HideMessage(command.Id)
	if err != nil {
		return err
	}
	oldMessage.Replace = command.Id

	return m.handleCommandMessage(messageState, oldMessage)
}

func (m *Messenger) HandleDeclineRequestTransaction(messageState *ReceivedMessageState, command protobuf.DeclineRequestTransaction) error {
	err := ValidateReceivedDeclineRequestTransaction(&command, messageState.CurrentMessageState.WhisperTimestamp)
	if err != nil {
		return err
	}
	oldMessage, err := m.persistence.MessageByID(command.Id)
	if err != nil {
		return err
	}
	if oldMessage == nil {
		return errors.New("message not found")
	}

	if oldMessage.LocalChatID != messageState.CurrentMessageState.Contact.ID {
		return errors.New("From must match")
	}

	if oldMessage.OutgoingStatus == "" {
		return errors.New("Initial message must originate from us")
	}

	if oldMessage.CommandParameters.CommandState != common.CommandStateRequestTransaction {
		return errors.New("Wrong state for command")
	}

	oldMessage.Clock = command.Clock
	oldMessage.Timestamp = messageState.CurrentMessageState.WhisperTimestamp
	oldMessage.Text = transactionRequestDeclinedMessage
	oldMessage.Seen = false
	oldMessage.CommandParameters.CommandState = common.CommandStateRequestTransactionDeclined
	oldMessage.ChatId = command.GetChatId()

	// Hide previous message
	err = m.persistence.HideMessage(command.Id)
	if err != nil {
		return err
	}
	oldMessage.Replace = command.Id

	return m.handleCommandMessage(messageState, oldMessage)
}

func (m *Messenger) matchChatEntity(chatEntity common.ChatEntity) (*Chat, error) {
	if chatEntity.GetSigPubKey() == nil {
		m.logger.Error("public key can't be empty")
		return nil, errors.New("received a chatEntity with empty public key")
	}

	switch {
	case chatEntity.GetMessageType() == protobuf.MessageType_PUBLIC_GROUP:
		// For public messages, all outgoing and incoming messages have the same chatID
		// equal to a public chat name.
		chatID := chatEntity.GetChatId()
		chat, ok := m.allChats.Load(chatID)
		if !ok {
			return nil, errors.New("received a public chatEntity from non-existing chat")
		}
		if !chat.Public() && !chat.ProfileUpdates() && !chat.Timeline() {
			return nil, ErrMessageForWrongChatType
		}
		return chat, nil
	case chatEntity.GetMessageType() == protobuf.MessageType_ONE_TO_ONE && common.IsPubKeyEqual(chatEntity.GetSigPubKey(), &m.identity.PublicKey):
		// It's a private message coming from us so we rely on Message.ChatID
		// If chat does not exist, it should be created to support multidevice synchronization.
		chatID := chatEntity.GetChatId()
		chat, ok := m.allChats.Load(chatID)
		if !ok {
			if len(chatID) != PubKeyStringLength {
				return nil, errors.New("invalid pubkey length")
			}
			bytePubKey, err := hex.DecodeString(chatID[2:])
			if err != nil {
				return nil, errors.Wrap(err, "failed to decode hex chatID")
			}

			pubKey, err := crypto.UnmarshalPubkey(bytePubKey)
			if err != nil {
				return nil, errors.Wrap(err, "failed to decode pubkey")
			}

			chat = CreateOneToOneChat(chatID[:8], pubKey, m.getTimesource())
		}
		// if we are the sender, the chat must be active
		chat.Active = true
		return chat, nil
	case chatEntity.GetMessageType() == protobuf.MessageType_ONE_TO_ONE:
		// It's an incoming private chatEntity. ChatID is calculated from the signature.
		// If a chat does not exist, a new one is created and saved.
		chatID := contactIDFromPublicKey(chatEntity.GetSigPubKey())
		chat, ok := m.allChats.Load(chatID)
		if !ok {
			// TODO: this should be a three-word name used in the mobile client
			chat = CreateOneToOneChat(chatID[:8], chatEntity.GetSigPubKey(), m.getTimesource())
			chat.Active = false
		}
		// We set the chat as inactive and will create a notification
		// if it's not coming from a contact
		contact, ok := m.allContacts.Load(chatID)
		chat.Active = chat.Active || (ok && contact.Added)
		return chat, nil
	case chatEntity.GetMessageType() == protobuf.MessageType_COMMUNITY_CHAT:
		chatID := chatEntity.GetChatId()
		chat, ok := m.allChats.Load(chatID)
		if !ok {
			return nil, errors.New("received community chat chatEntity for non-existing chat")
		}

		if chat.CommunityID == "" || chat.ChatType != ChatTypeCommunityChat {
			return nil, errors.New("not an community chat")
		}

		var emojiReaction bool
		var pinMessage bool
		// We allow emoji reactions from anyone
		switch chatEntity.(type) {
		case *EmojiReaction:
			emojiReaction = true
		case *common.PinMessage:
			pinMessage = true
		}

		canPost, err := m.communitiesManager.CanPost(chatEntity.GetSigPubKey(), chat.CommunityID, chat.CommunityChatID(), chatEntity.GetGrant())
		if err != nil {
			return nil, err
		}

		community, err := m.communitiesManager.GetByIDString(chat.CommunityID)
		if err != nil {
			return nil, err
		}

		isMemberAdmin := community.IsMemberAdmin(chatEntity.GetSigPubKey())
		pinMessageAllowed := community.AllowsAllMembersToPinMessage()

		if (pinMessage && !isMemberAdmin && !pinMessageAllowed) || (!emojiReaction && !canPost) {
			return nil, errors.New("user can't post")
		}

		return chat, nil
	case chatEntity.GetMessageType() == protobuf.MessageType_PRIVATE_GROUP:
		// In the case of a group chatEntity, ChatID is the same for all messages belonging to a group.
		// It needs to be verified if the signature public key belongs to the chat.
		chatID := chatEntity.GetChatId()
		chat, ok := m.allChats.Load(chatID)
		if !ok {
			return nil, errors.New("received group chat chatEntity for non-existing chat")
		}

		theirKeyHex := contactIDFromPublicKey(chatEntity.GetSigPubKey())
		myKeyHex := contactIDFromPublicKey(&m.identity.PublicKey)
		var theyJoined bool
		var iJoined bool
		for _, member := range chat.Members {
			if member.ID == theirKeyHex && member.Joined {
				theyJoined = true
			}
		}
		for _, member := range chat.Members {
			if member.ID == myKeyHex && member.Joined {
				iJoined = true
			}
		}

		if theyJoined && iJoined {
			return chat, nil
		}

		return nil, errors.New("did not find a matching group chat")
	default:
		return nil, errors.New("can not match a chat because there is no valid case")
	}
}

func (m *Messenger) messageExists(messageID string, existingMessagesMap map[string]bool) (bool, error) {
	if _, ok := existingMessagesMap[messageID]; ok {
		return true, nil
	}

	existingMessagesMap[messageID] = true

	// Check against the database, this is probably a bit slow for
	// each message, but for now might do, we'll make it faster later
	existingMessage, err := m.persistence.MessageByID(messageID)
	if err != nil && err != common.ErrRecordNotFound {
		return false, err
	}
	if existingMessage != nil {
		return true, nil
	}
	return false, nil
}

func (m *Messenger) HandleEmojiReaction(state *ReceivedMessageState, pbEmojiR protobuf.EmojiReaction) error {
	logger := m.logger.With(zap.String("site", "HandleEmojiReaction"))
	if err := ValidateReceivedEmojiReaction(&pbEmojiR, state.Timesource.GetCurrentTime()); err != nil {
		logger.Error("invalid emoji reaction", zap.Error(err))
		return err
	}

	from := state.CurrentMessageState.Contact.ID

	emojiReaction := &EmojiReaction{
		EmojiReaction: pbEmojiR,
		From:          from,
		SigPubKey:     state.CurrentMessageState.PublicKey,
	}

	existingEmoji, err := m.persistence.EmojiReactionByID(emojiReaction.ID())
	if err != common.ErrRecordNotFound && err != nil {
		return err
	}

	if existingEmoji != nil && existingEmoji.Clock >= pbEmojiR.Clock {
		// this is not a valid emoji, ignoring
		return nil
	}

	chat, err := m.matchChatEntity(emojiReaction)
	if err != nil {
		return err // matchChatEntity returns a descriptive error message
	}

	// Set local chat id
	emojiReaction.LocalChatID = chat.ID

	logger.Debug("Handling emoji reaction")

	if chat.LastClockValue < pbEmojiR.Clock {
		chat.LastClockValue = pbEmojiR.Clock
	}

	state.Response.AddChat(chat)
	// TODO(samyoul) remove storing of an updated reference pointer?
	state.AllChats.Store(chat.ID, chat)

	// save emoji reaction
	err = m.persistence.SaveEmojiReaction(emojiReaction)
	if err != nil {
		return err
	}

	state.EmojiReactions[emojiReaction.ID()] = emojiReaction

	return nil
}

func (m *Messenger) HandleGroupChatInvitation(state *ReceivedMessageState, pbGHInvitations protobuf.GroupChatInvitation) error {
	allowed, err := m.isMessageAllowedFrom(state.CurrentMessageState.Contact.ID, nil)
	if err != nil {
		return err
	}

	if !allowed {
		return ErrMessageNotAllowed
	}
	logger := m.logger.With(zap.String("site", "HandleGroupChatInvitation"))
	if err := ValidateReceivedGroupChatInvitation(&pbGHInvitations); err != nil {
		logger.Error("invalid group chat invitation", zap.Error(err))
		return err
	}

	groupChatInvitation := &GroupChatInvitation{
		GroupChatInvitation: pbGHInvitations,
		SigPubKey:           state.CurrentMessageState.PublicKey,
	}

	//From is the PK of author of invitation request
	if groupChatInvitation.State == protobuf.GroupChatInvitation_REJECTED {
		//rejected so From is the current user who received this rejection
		groupChatInvitation.From = types.EncodeHex(crypto.FromECDSAPub(&m.identity.PublicKey))
	} else {
		//invitation request, so From is the author of message
		groupChatInvitation.From = state.CurrentMessageState.Contact.ID
	}

	existingInvitation, err := m.persistence.InvitationByID(groupChatInvitation.ID())
	if err != common.ErrRecordNotFound && err != nil {
		return err
	}

	if existingInvitation != nil && existingInvitation.Clock >= pbGHInvitations.Clock {
		// this is not a valid invitation, ignoring
		return nil
	}

	// save invitation
	err = m.persistence.SaveInvitation(groupChatInvitation)
	if err != nil {
		return err
	}

	state.GroupChatInvitations[groupChatInvitation.ID()] = groupChatInvitation

	return nil
}

// HandleChatIdentity handles an incoming protobuf.ChatIdentity
// extracts contact information stored in the protobuf and adds it to the user's contact for update.
func (m *Messenger) HandleChatIdentity(state *ReceivedMessageState, ci protobuf.ChatIdentity) error {
	s, err := m.settings.GetSettings()
	if err != nil {
		return err
	}

	contact := state.CurrentMessageState.Contact

	if err = ValidateDisplayName(&ci.DisplayName); err != nil {
		return err
	}

	if contact.DisplayName != ci.DisplayName && len(ci.DisplayName) != 0 {
		contact.DisplayName = ci.DisplayName
		state.ModifiedContacts.Store(contact.ID, true)
		state.AllContacts.Store(contact.ID, contact)
	}

	viewFromContacts := s.ProfilePicturesVisibility == settings.ProfilePicturesVisibilityContactsOnly
	viewFromNoOne := s.ProfilePicturesVisibility == settings.ProfilePicturesVisibilityNone

	m.logger.Debug("settings found",
		zap.Bool("viewFromContacts", viewFromContacts),
		zap.Bool("viewFromNoOne", viewFromNoOne),
	)

	// If we don't want to view profile images from anyone, don't process identity images.
	// We don't want to store the profile images of other users, even if we don't display images.
	inOurContacts, ok := m.allContacts.Load(state.CurrentMessageState.Contact.ID)

	isContact := ok && inOurContacts.Added
	if viewFromNoOne && !isContact {
		return nil
	}

	// If there are no images attached to a ChatIdentity, check if message is allowed
	// Or if there are images and visibility is set to from contacts only, check if message is allowed
	// otherwise process the images without checking if the message is allowed
	if len(ci.Images) == 0 || (len(ci.Images) > 0 && (viewFromContacts)) {
		allowed, err := m.isMessageAllowedFrom(state.CurrentMessageState.Contact.ID, nil)
		if err != nil {
			return err
		}

		if !allowed {
			return ErrMessageNotAllowed
		}
	}

	err = DecryptIdentityImagesWithIdentityPrivateKey(ci.Images, m.identity, state.CurrentMessageState.PublicKey)
	if err != nil {
		return err
	}

	// Remove any images still encrypted after the decryption process
	for name, image := range ci.Images {
		if image.Encrypted {
			delete(ci.Images, name)
		}
	}

	newImages, err := m.persistence.SaveContactChatIdentity(contact.ID, &ci)
	if err != nil {
		return err
	}
	if newImages {
		for imageType, image := range ci.Images {
			if contact.Images == nil {
				contact.Images = make(map[string]images.IdentityImage)
			}
			contact.Images[imageType] = images.IdentityImage{Name: imageType, Payload: image.Payload}

		}
		state.ModifiedContacts.Store(contact.ID, true)
		state.AllContacts.Store(contact.ID, contact)
	}

	return nil
}

func (m *Messenger) HandleAnonymousMetricBatch(amb protobuf.AnonymousMetricBatch) error {

	// TODO
	return nil
}

func (m *Messenger) checkForEdits(message *common.Message) error {
	// Check for any pending edit
	// If any pending edits are available and valid, apply them
	edits, err := m.persistence.GetEdits(message.ID, message.From)
	if err != nil {
		return err
	}

	if len(edits) == 0 {
		return nil
	}

	// Apply the first edit that is valid
	for _, e := range edits {
		if e.Clock >= message.Clock {
			// Update message and return it
			err := m.applyEditMessage(&e.EditMessage, message)
			if err != nil {
				return err
			}
			return nil
		}
	}

	return nil
}

func (m *Messenger) checkForDeletes(message *common.Message) error {
	// Check for any pending deletes
	// If any pending deletes are available and valid, apply them
	messageDeletes, err := m.persistence.GetDeletes(message.ID, message.From)
	if err != nil {
		return err
	}

	if len(messageDeletes) == 0 {
		return nil
	}

	return m.applyDeleteMessage(messageDeletes, message)
}

func (m *Messenger) isMessageAllowedFrom(publicKey string, chat *Chat) (bool, error) {
	onlyFromContacts, err := m.settings.GetMessagesFromContactsOnly()
	if err != nil {
		return false, err
	}

	if !onlyFromContacts {
		return true, nil
	}

	// if it's from us, it's allowed
	if contactIDFromPublicKey(&m.identity.PublicKey) == publicKey {
		return true, nil
	}

	// If the chat is active, we allow it
	if chat != nil && chat.Active {
		return true, nil
	}

	// If the chat is public, we allow it
	if chat != nil && chat.Public() {
		return true, nil
	}

	contact, ok := m.allContacts.Load(publicKey)
	if !ok {
		// If it's not in contacts, we don't allow it
		return false, nil
	}

	// Otherwise we check if we added it
	return contact.Added, nil
}

func (m *Messenger) updateUnviewedCounts(chat *Chat, mentioned bool) {
	chat.UnviewedMessagesCount++
	if mentioned {
		chat.UnviewedMentionsCount++
	}
}

func (m *Messenger) HandleSyncWalletAccount(state *ReceivedMessageState, message protobuf.SyncWalletAccounts) error {
	dbAccounts, err := m.settings.GetAccounts()
	if err != nil {
		return err
	}

	dbAccountMap := make(map[types.Address]*accounts.Account)
	for _, acc := range dbAccounts {
		dbAccountMap[acc.Address] = acc
	}

	var accs []*accounts.Account
	for _, message := range message.Accounts {
		dbAcc := dbAccountMap[types.BytesToAddress(message.Address)]
		if dbAcc != nil && message.Clock <= dbAcc.Clock {
			continue
		}
		var acc *accounts.Account
		if dbAcc != nil && message.Removed {
			acc = &accounts.Account{
				Address: types.BytesToAddress(message.Address),
				Removed: true,
			}
		} else if !message.Removed {
			acc = &accounts.Account{
				Address:   types.BytesToAddress(message.Address),
				Wallet:    message.Wallet,
				Chat:      message.Chat,
				Type:      message.Type,
				Storage:   message.Storage,
				PublicKey: types.HexBytes(message.PublicKey),
				Path:      message.Path,
				Color:     message.Color,
				Hidden:    message.Hidden,
				Name:      message.Name,
				Clock:     message.Clock,
			}

		}
		accs = append(accs, acc)
	}

	if len(accs) == 0 {
		return nil
	}

	err = m.settings.SaveAccounts(accs)
	if err != nil {
		return err
	}

	if err == nil {
		state.Response.Accounts = accs
	}

	return err
}