package protocol

import (
	"database/sql"

	"go.uber.org/zap"

	"github.com/golang/protobuf/proto"

	"github.com/status-im/status-go/images"
	"github.com/status-im/status-go/multiaccounts/errors"
	"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/protobuf"
	v1protocol "github.com/status-im/status-go/protocol/v1"
	"github.com/status-im/status-go/protocol/wakusync"
	ensservice "github.com/status-im/status-go/services/ens"
)

const (
	SyncWakuSectionKeyProfile           = "profile"
	SyncWakuSectionKeyContacts          = "contacts"
	SyncWakuSectionKeyCommunities       = "communities"
	SyncWakuSectionKeySettings          = "settings"
	SyncWakuSectionKeyKeypairs          = "keypairs"
	SyncWakuSectionKeyWatchOnlyAccounts = "watchOnlyAccounts"
)

func (m *Messenger) HandleBackup(state *ReceivedMessageState, message *protobuf.Backup, statusMessage *v1protocol.StatusMessage) error {
	if !m.processBackedupMessages {
		return nil
	}

	errors := m.handleBackup(state, message)
	if len(errors) > 0 {
		for _, err := range errors {
			m.logger.Warn("failed to handle Backup", zap.Error(err))
		}
		return errors[0]
	}
	return nil
}

func (m *Messenger) handleBackup(state *ReceivedMessageState, message *protobuf.Backup) []error {
	var errors []error

	err := m.handleBackedUpProfile(message.Profile, message.Clock)
	if err != nil {
		errors = append(errors, err)
	}

	for _, contact := range message.Contacts {
		err = m.HandleSyncInstallationContactV2(state, contact, nil)
		if err != nil {
			errors = append(errors, err)
		}
	}

	err = m.handleSyncChats(state, message.Chats)
	if err != nil {
		errors = append(errors, err)
	}

	communityErrors := m.handleSyncedCommunities(state, message)
	if len(communityErrors) > 0 {
		errors = append(errors, communityErrors...)
	}

	err = m.handleBackedUpSettings(message.Setting)
	if err != nil {
		errors = append(errors, err)
	}

	err = m.handleKeypair(message.Keypair)
	if err != nil {
		errors = append(errors, err)
	}

	err = m.handleWatchOnlyAccount(message.WatchOnlyAccount)
	if err != nil {
		errors = append(errors, err)
	}

	// Send signal about applied backup progress
	if m.config.messengerSignalsHandler != nil {
		response := wakusync.WakuBackedUpDataResponse{
			Clock: message.Clock,
		}

		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeyProfile, message.ProfileDetails)
		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeyContacts, message.ContactsDetails)
		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeyCommunities, message.CommunitiesDetails)
		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeySettings, message.SettingsDetails)
		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeyKeypairs, message.KeypairDetails)
		response.AddFetchingBackedUpDataDetails(SyncWakuSectionKeyWatchOnlyAccounts, message.WatchOnlyAccountDetails)

		m.config.messengerSignalsHandler.SendWakuFetchingBackupProgress(&response)
	}

	state.Response.BackupHandled = true

	return errors
}

func (m *Messenger) handleBackedUpProfile(message *protobuf.BackedUpProfile, backupTime uint64) error {
	if message == nil {
		return nil
	}

	response := wakusync.WakuBackedUpDataResponse{
		Profile: &wakusync.BackedUpProfile{},
	}

	err := m.SaveSyncDisplayName(message.DisplayName, message.DisplayNameClock)
	if err != nil && err != errors.ErrNewClockOlderThanCurrent {
		return err
	}

	response.SetDisplayName(message.DisplayName)

	// if we already have a newer clock, then we don't need to update the display name
	if err == errors.ErrNewClockOlderThanCurrent {
		response.SetDisplayName(m.account.Name)
	}

	syncWithBackedUpImages := false
	dbImages, err := m.multiAccounts.GetIdentityImages(message.KeyUid)
	if err != nil {
		if err != sql.ErrNoRows {
			return err
		}
		// if images are deleted and no images were backed up, then we need to delete them on other devices,
		// that's why we don't return in case of `sql.ErrNoRows`
		syncWithBackedUpImages = true
	}
	if len(dbImages) == 0 {
		if len(message.Pictures) > 0 {
			syncWithBackedUpImages = true
		}
	} else {
		// since both images (large and thumbnail) are always stored in the same time, we're free to use either of those two clocks for comparison
		lastImageStoredClock := dbImages[0].Clock
		syncWithBackedUpImages = lastImageStoredClock < backupTime
	}

	if syncWithBackedUpImages {
		if len(message.Pictures) == 0 {
			err = m.multiAccounts.DeleteIdentityImage(message.KeyUid)
			if err != nil {
				return err
			}
			response.SetImages(nil)
		} else {
			idImages := make([]images.IdentityImage, len(message.Pictures))
			for i, pic := range message.Pictures {
				img := images.IdentityImage{
					Name:         pic.Name,
					Payload:      pic.Payload,
					Width:        int(pic.Width),
					Height:       int(pic.Height),
					FileSize:     int(pic.FileSize),
					ResizeTarget: int(pic.ResizeTarget),
					Clock:        pic.Clock,
				}
				idImages[i] = img
			}
			err = m.multiAccounts.StoreIdentityImages(message.KeyUid, idImages, false)
			if err != nil {
				return err
			}
			response.SetImages(idImages)
		}
	}

	profileShowcasePreferences, err := m.saveProfileShowcasePreferencesProto(message.ProfileShowcasePreferences, false)
	if err != nil {
		return err
	}
	if profileShowcasePreferences != nil {
		response.SetProfileShowcasePreferences(profileShowcasePreferences)
	}

	var ensUsernameDetails []*ensservice.UsernameDetail
	for _, d := range message.EnsUsernameDetails {
		dd, err := m.saveEnsUsernameDetailProto(d)
		if err != nil {
			return err
		}
		ensUsernameDetails = append(ensUsernameDetails, dd)
	}
	response.SetEnsUsernameDetails(ensUsernameDetails)

	if m.config.messengerSignalsHandler != nil {
		m.config.messengerSignalsHandler.SendWakuBackedUpProfile(&response)
	}

	return err
}

func (m *Messenger) handleBackedUpSettings(message *protobuf.SyncSetting) error {
	if message == nil {
		return nil
	}

	// DisplayName is recovered via `protobuf.BackedUpProfile` message
	if message.GetType() == protobuf.SyncSetting_DISPLAY_NAME {
		return nil
	}

	settingField, err := m.extractAndSaveSyncSetting(message)
	if err != nil {
		m.logger.Warn("failed to handle SyncSetting from backed up message", zap.Error(err))
		return nil
	}

	if settingField != nil {
		if message.GetType() == protobuf.SyncSetting_PREFERRED_NAME && message.GetValueString() != "" {
			displayNameClock, err := m.settings.GetSettingLastSynced(settings.DisplayName)
			if err != nil {
				m.logger.Warn("failed to get last synced clock for display name", zap.Error(err))
				return nil
			}
			// there is a race condition between display name and preferred name on updating m.account.Name, so we need to check the clock
			// there is also a similar check within SaveSyncDisplayName
			if displayNameClock < message.GetClock() {
				m.account.Name = message.GetValueString()
				err = m.multiAccounts.SaveAccount(*m.account)
				if err != nil {
					m.logger.Warn("[handleBackedUpSettings] failed to save account", zap.Error(err))
					return nil
				}
			}
		}

		if m.config.messengerSignalsHandler != nil {
			response := wakusync.WakuBackedUpDataResponse{
				Setting: settingField,
			}
			m.config.messengerSignalsHandler.SendWakuBackedUpSettings(&response)
		}
	}

	return nil
}

func (m *Messenger) handleKeypair(message *protobuf.SyncKeypair) error {
	if message == nil {
		return nil
	}

	multiAcc, err := m.multiAccounts.GetAccount(message.KeyUid)
	if err != nil {
		return err
	}
	// If user is recovering his account via seed phrase, but the backed up messages indicate that the profile keypair
	// is a keycard related profile, then we need to remove related profile keycards (only profile, other keycards should remain).
	if multiAcc != nil && multiAcc.KeyUID == message.KeyUid && !multiAcc.RefersToKeycard() && len(message.Keycards) > 0 {
		message.Keycards = []*protobuf.SyncKeycard{}
	}

	keypair, err := m.handleSyncKeypair(message, false, nil)
	if err != nil {
		if err == ErrTryingToStoreOldKeypair {
			return nil
		}
		return err
	}

	if m.config.messengerSignalsHandler != nil {
		kpResponse := wakusync.WakuBackedUpDataResponse{
			Keypair: keypair.CopyKeypair(),
		}

		m.config.messengerSignalsHandler.SendWakuBackedUpKeypair(&kpResponse)
	}

	return nil
}

func (m *Messenger) handleWatchOnlyAccount(message *protobuf.SyncAccount) error {
	if message == nil {
		return nil
	}

	acc, err := m.handleSyncWatchOnlyAccount(message, true)
	if err != nil {
		if err == ErrTryingToStoreOldWalletAccount {
			return nil
		}
		return err
	}

	if m.config.messengerSignalsHandler != nil {
		response := wakusync.WakuBackedUpDataResponse{
			WatchOnlyAccount: acc,
		}

		m.config.messengerSignalsHandler.SendWakuBackedUpWatchOnlyAccount(&response)
	}

	return nil
}

func (m *Messenger) handleSyncedCommunities(state *ReceivedMessageState, message *protobuf.Backup) []error {
	var errors []error
	for _, syncCommunity := range message.Communities {
		err := m.handleSyncInstallationCommunity(state, syncCommunity, nil)
		if err != nil {
			errors = append(errors, err)
		}

		err = m.requestCommunityKeys(state, syncCommunity)
		if err != nil {
			errors = append(errors, err)
		}
	}

	return errors
}

func (m *Messenger) requestCommunityKeys(state *ReceivedMessageState, syncCommunity *protobuf.SyncInstallationCommunity) error {
	if !syncCommunity.Joined {
		return nil
	}

	community, err := m.GetCommunityByID(syncCommunity.Id)
	if err != nil {
		return err
	}

	if community == nil {
		return communities.ErrOrgNotFound
	}

	isEncrypted := syncCommunity.Encrypted || len(syncCommunity.EncryptionKeysV2) > 0
	if !isEncrypted {
		// check if we have encrypted channels
		myPk := m.IdentityPublicKeyString()
		for channelID, channel := range community.Chats() {
			_, exists := channel.GetMembers()[myPk]
			if exists && community.ChannelEncrypted(channelID) {
				isEncrypted = true
				break
			}
		}
	}

	if isEncrypted {
		request := &protobuf.CommunityEncryptionKeysRequest{
			CommunityId: syncCommunity.Id,
		}

		payload, err := proto.Marshal(request)
		if err != nil {
			return err
		}

		rawMessage := &common.RawMessage{
			Payload:             payload,
			Sender:              m.identity,
			CommunityID:         community.ID(),
			SkipEncryptionLayer: true,
			MessageType:         protobuf.ApplicationMetadataMessage_COMMUNITY_ENCRYPTION_KEYS_REQUEST,
		}

		_, err = m.SendMessageToControlNode(community, rawMessage)

		if err != nil {
			m.logger.Error("failed to request community encryption keys", zap.String("communityId", community.IDString()), zap.Error(err))
			return err
		}
	}

	return nil
}