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/*
 * Copyright (C) 2017/2021 e-voyageurs technologies
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ai.tock.bot.mongo

import ai.tock.bot.admin.dialog.*
import ai.tock.bot.admin.user.*
import ai.tock.bot.connector.ConnectorMessage
import ai.tock.bot.definition.BotDefinition
import ai.tock.bot.definition.StoryDefinition
import ai.tock.bot.engine.action.Action
import ai.tock.bot.engine.action.SendSentence
import ai.tock.bot.engine.dialog.ArchivedEntityValue
import ai.tock.bot.engine.dialog.Dialog
import ai.tock.bot.engine.dialog.EntityStateValue
import ai.tock.bot.engine.dialog.Snapshot
import ai.tock.bot.engine.nlp.NlpCallStats
import ai.tock.bot.engine.user.PlayerId
import ai.tock.bot.engine.user.PlayerType
import ai.tock.bot.engine.user.UserTimeline
import ai.tock.bot.engine.user.UserTimelineDAO
import ai.tock.bot.mongo.BotApplicationConfigurationMongoDAO.getApplicationIds
import ai.tock.bot.mongo.ClientIdCol_.Companion.UserIds
import ai.tock.bot.mongo.DialogCol_.Companion.GroupId
import ai.tock.bot.mongo.DialogCol_.Companion.PlayerIds
import ai.tock.bot.mongo.DialogCol_.Companion.Stories
import ai.tock.bot.mongo.DialogCol_.Companion.Test
import ai.tock.bot.mongo.DialogCol_.Companion._id
import ai.tock.bot.mongo.DialogTextCol_.Companion.Date
import ai.tock.bot.mongo.DialogTextCol_.Companion.DialogId
import ai.tock.bot.mongo.DialogTextCol_.Companion.Text
import ai.tock.bot.mongo.MongoBotConfiguration.database
import ai.tock.bot.mongo.NlpStatsCol_.Companion.AppNamespace
import ai.tock.bot.mongo.UserTimelineCol_.Companion.ApplicationIds
import ai.tock.bot.mongo.UserTimelineCol_.Companion.LastUpdateDate
import ai.tock.bot.mongo.UserTimelineCol_.Companion.LastUserActionDate
import ai.tock.bot.mongo.UserTimelineCol_.Companion.Namespace
import ai.tock.bot.mongo.UserTimelineCol_.Companion.PlayerId
import ai.tock.bot.mongo.UserTimelineCol_.Companion.TemporaryIds
import ai.tock.shared.*
import ai.tock.shared.ensureIndex
import ai.tock.shared.ensureUniqueIndex
import ai.tock.shared.jackson.AnyValueWrapper
import com.github.salomonbrys.kodein.instance
import com.mongodb.ReadPreference.secondaryPreferred
import com.mongodb.client.model.IndexOptions
import com.mongodb.client.model.ReplaceOptions
import mu.KotlinLogging
import org.litote.kmongo.*
import org.litote.kmongo.MongoOperator.*
import kotlinx.coroutines.newSingleThreadContext
import kotlinx.coroutines.runBlocking
import kotlinx.coroutines.withContext
import java.time.Instant
import java.time.Instant.now
import java.time.ZoneOffset
import java.util.concurrent.TimeUnit.DAYS

/**
 *
 */
internal object UserTimelineMongoDAO : UserTimelineDAO, UserReportDAO, DialogReportDAO {

    private val addNamespaceToTimelineId: Boolean = booleanProperty("tock_bot_add_namespace_to_timeline_id", false)
    private val maxActionsByDialog = intProperty("tock_bot_max_actions_by_dialog", 1000)
    private val dialogFlowStatEnabled = booleanProperty("tock_bot_dialog_flow_stat", true)
    private val dialogMaxValidityInSeconds = longProperty("tock_bot_dialog_max_validity_in_seconds", 60 * 60 * 24)

    // wrapper to workaround the 1024 chars limit for String indexes
    private fun textKey(text: String): String =
        if (text.length > 512) text.substring(0, Math.min(512, text.length)) else text

    private val logger = KotlinLogging.logger {}

    private val executor: Executor by injector.instance()

    val userTimelineCol = database.getCollection("user_timeline")
    val dialogCol = database.getCollection("dialog")
    private val dialogTextCol = database.getCollection("dialog_text")
    private val clientIdCol = database.getCollection("client_id")
    private val connectorMessageCol = database.getCollection("connector_message")
    private val nlpStatsCol = database.getCollection("action_nlp_stats")
    private val snapshotCol = database.getCollection("dialog_snapshot")
    private val archivedEntityValuesCol = database.getCollection("archived_entity_values")

    init {
        try {
            val ttlIndexOptions = IndexOptions().expireAfter(longProperty("tock_bot_dialog_index_ttl_days", 7), DAYS)

            if (addNamespaceToTimelineId) {
                userTimelineCol.ensureUniqueIndex(PlayerId.id, Namespace)
            } else {
                userTimelineCol.ensureUniqueIndex(PlayerId.id)
            }

            userTimelineCol.ensureIndex(TemporaryIds)
            userTimelineCol.ensureIndex(
                LastUpdateDate,
                indexOptions = IndexOptions()
                    .expireAfter(longProperty("tock_bot_timeline_index_ttl_days", 365), DAYS)
            )
            userTimelineCol.ensureIndex(
                Namespace,
                ApplicationIds,
                UserTimelineCol_.UserPreferences.test,
                LastUpdateDate
            )
            dialogCol.ensureIndex(PlayerIds.id, Namespace)
            dialogCol.ensureIndex(PlayerIds.clientId)
            dialogCol.ensureIndex(ApplicationIds, Test, DialogCol_.LastUpdateDate)
            dialogCol.ensureIndex(
                DialogCol_.LastUpdateDate,
                indexOptions = ttlIndexOptions
            )
            dialogCol.ensureIndex(
                DialogCol_.ApplicationIds,
                DialogCol_.Namespace,
                DialogCol_.Rating,
                Test
            )
            dialogCol.ensureIndex(
                orderBy(
                    mapOf(
                        PlayerIds.id to true,
                        LastUpdateDate to false
                    )
                )
            )
            dialogCol.ensureIndex(GroupId)

            dialogTextCol.ensureUniqueIndex(Text, DialogId)
            dialogTextCol.ensureIndex(
                Date,
                indexOptions = ttlIndexOptions
            )
            connectorMessageCol.ensureIndex(
                "{date:1}",
                ttlIndexOptions
            )
            connectorMessageCol.ensureIndex("{'_id.dialogId':1}")
            nlpStatsCol.ensureIndex(
                Date,
                indexOptions = ttlIndexOptions
            )
            nlpStatsCol.ensureIndex(NlpStatsCol_._id.actionId, AppNamespace)
            snapshotCol.ensureIndex(
                SnapshotCol_.LastUpdateDate,
                indexOptions = ttlIndexOptions
            )
            archivedEntityValuesCol.ensureIndex(
                ArchivedEntityValuesCol_.LastUpdateDate,
                indexOptions = ttlIndexOptions
            )
        } catch (e: Exception) {
            logger.error(e)
        }
    }

    override fun save(userTimeline: UserTimeline, namespace: String) {
        save(userTimeline, namespace, null)
    }

    override fun save(userTimeline: UserTimeline, botDefinition: BotDefinition, asynchronousProcess: Boolean) {
        save(userTimeline, botDefinition.namespace, botDefinition, asynchronousProcess)
    }

    private fun timelineId(userId: String, namespace: String): String =
        if (addNamespaceToTimelineId) "_${namespace}_$userId" else userId

    private fun save(userTimeline: UserTimeline, namespace: String, botDefinition: BotDefinition?, asynchronousProcess: Boolean = true) {
        logger.debug { "start to save timeline $userTimeline" }
        val timelineId = timelineId(userTimeline.playerId.id, namespace)
        val oldTimeline = userTimelineCol.findOneById(timelineId)
        logger.debug { "load old timeline $userTimeline" }
        val newTimeline = UserTimelineCol(timelineId, namespace, userTimeline, oldTimeline)
        logger.debug { "create new timeline $newTimeline" }
        userTimelineCol.save(newTimeline)
        logger.debug { "timeline saved $userTimeline" }
        // create a new dialog if actions number limit reached
        val lastDialog = userTimeline.currentDialog
        if (lastDialog != null && lastDialog.actionsSize > maxActionsByDialog) {
            userTimeline.dialogs.add(Dialog.initFromDialog(lastDialog))
        }
        for (dialog in userTimeline.dialogs) {
            val dialogToSave = DialogCol(dialog, newTimeline)
            logger.debug { "dialog to save created $userTimeline" }
            try {
                dialogCol.save(dialogToSave)
            } catch (e: Exception) {
                logger.error(e)
                logger.error("Dialog save failure: $dialogToSave")
            }
            logger.debug { "dialog saved $userTimeline" }
        }

        val saveProcessing = {
            if (userTimeline.playerId.clientId != null) {
                clientIdCol.updateOneById(
                    userTimeline.playerId.clientId!!,
                    addEachToSet(
                        UserIds,
                        listOf(userTimeline.playerId.id)
                    ),
                    upsert()
                )
            }
            var lastSnapshot: SnapshotCol? = null
            for (dialog in userTimeline.dialogs) {
                lastSnapshot = addSnapshot(dialog)
                addArchivedValues(dialog)

                dialog.allActions().forEach {
                    when (it) {
                        is SendSentenceNotYetLoaded -> {
                            if (it.messageLoaded && it.messages.isNotEmpty()) {
                                saveConnectorMessage(it.toActionId(), dialog.id, it.messages)
                            }
                            if (it.nlpStatsLoaded && it.nlpStats != null) {
                                saveNlpStats(it.toActionId(), dialog.id, it.nlpStats!!)
                            }
                        }

                        is SendSentence -> {
                            if (it.messages.isNotEmpty()) {
                                saveConnectorMessage(it.toActionId(), dialog.id, it.messages)
                            }
                            if (it.nlpStats != null) {
                                saveNlpStats(it.toActionId(), dialog.id, it.nlpStats!!)
                            }
                        }

                        else -> {
                            /*do nothing*/
                        }
                    }
                }
            }
            val lastUserAction = lastDialog?.allActions()?.lastOrNull { it.playerId.type == PlayerType.user }
            lastUserAction?.let { action ->
                if (action is SendSentence && action.stringText != null) {
                    val text = textKey(action.stringText!!)
                    dialogTextCol.replaceOneWithFilter(
                        and(Text eq text, DialogId eq lastDialog.id),
                        DialogTextCol(text, lastDialog.id),
                        ReplaceOptions().upsert(true)
                    )
                }
            }
            if (dialogFlowStatEnabled && botDefinition != null && lastDialog != null && lastSnapshot != null && lastUserAction != null) {
                DialogFlowMongoDAO.addFlowStat(userTimeline, botDefinition, lastUserAction, lastDialog, lastSnapshot)
            }
        }

        if(asynchronousProcess) {
            executor.executeBlocking { saveProcessing() }
        } else {
            saveProcessing()
        }

        logger.debug { "end saving timeline $userTimeline" }
    }

    override fun updatePlayerId(namespace: String, oldPlayerId: PlayerId, newPlayerId: PlayerId) {
        val timelineId = timelineId(oldPlayerId.id, namespace)
        userTimelineCol.updateOneById(timelineId, setValue(PlayerId, newPlayerId))
        dialogCol.updateMany(
            and(
                Namespace eq namespace,
                PlayerIds contains oldPlayerId
            ),
            addToSet(PlayerIds, newPlayerId)
        )
        dialogCol.updateMany(
            and(
                Namespace eq namespace,
                PlayerIds contains newPlayerId
            ),
            pull(PlayerIds, oldPlayerId)
        )
        if (newPlayerId.clientId != null) {
            clientIdCol.updateOneById(
                newPlayerId.clientId!!,
                addToSet(
                    UserIds,
                    newPlayerId.id
                ),
                upsert()
            )
        }
    }

    private fun saveConnectorMessage(actionId: Id, dialogId: Id, messages: List) {
        connectorMessageCol.save(
            ConnectorMessageCol(
                ConnectorMessageColId(actionId, dialogId),
                messages.map { AnyValueWrapper(it) }
            )
        )
    }

    internal fun loadConnectorMessage(actionId: Id, dialogId: Id): List {
        return try {
            connectorMessageCol.findOneById(ConnectorMessageColId(actionId, dialogId))
                ?.messages
                ?.mapNotNull { it?.value as? ConnectorMessage }
                ?: emptyList()
        } catch (e: Exception) {
            logger.error(e)
            emptyList()
        }
    }

    internal fun loadConnectorMessages(ids: List): Map> {
        return try {
            if (ids.isEmpty()) {
                emptyMap()
            } else {
                connectorMessageCol.find(ConnectorMessageCol::_id `in` ids)
                    .map { m -> m._id to m.messages.mapNotNull { it?.value as? ConnectorMessage } }
                    .toMap()
            }
        } catch (e: Exception) {
            logger.error(e)
            emptyMap()
        }
    }

    private fun saveNlpStats(actionId: Id, dialogId: Id, nlpCallStats: NlpCallStats) {
        nlpStatsCol.save(
            NlpStatsCol(
                NlpStatsColId(actionId, dialogId),
                nlpCallStats,
                nlpCallStats.nlpQuery.namespace
            )
        )
    }

    internal fun loadNlpStats(actionId: Id, dialogId: Id): NlpCallStats? {
        return try {
            nlpStatsCol.findOneById(NlpStatsColId(actionId, dialogId))?.stats
        } catch (e: Exception) {
            logger.error(e)
            null
        }
    }

    override fun getNlpCallStats(actionId: Id, namespace: String): NlpCallStats? {
        return try {
            nlpStatsCol.findOne(NlpStatsCol_._id.actionId eq actionId, AppNamespace eq namespace)?.stats
        } catch (e: Exception) {
            logger.error(e)
            null
        }
    }

    override fun loadWithLastValidDialog(
        namespace: String,
        userId: PlayerId,
        priorUserId: PlayerId?,
        groupId: String?,
        storyDefinitionProvider: (String) -> StoryDefinition
    ): UserTimeline {
        val timeline = loadWithoutDialogs(namespace, userId)

        loadLastValidDialog(namespace, userId, groupId, storyDefinitionProvider)?.apply { timeline.dialogs.add(this) }

        if (priorUserId != null) {
            // link timeline
            timeline.temporaryIds.add(priorUserId.id)

            // copy state
            val priorTimelineId = timelineId(priorUserId.id, namespace)
            userTimelineCol.findOneById(priorTimelineId)
                ?.apply {
                    toUserTimeline().userState.flags.forEach {
                        timeline.userState.flags.putIfAbsent(it.key, it.value)
                    }
                }

            // copy dialog
            loadLastValidDialog(namespace, priorUserId, groupId, storyDefinitionProvider)
                ?.apply {
                    timeline.dialogs.add(
                        copy(
                            playerIds + userId
                        )
                    )
                }
        }

        logger.trace { "timeline for user $userId : $timeline" }
        return timeline
    }

    override fun remove(namespace: String, playerId: PlayerId) {
        dialogCol.deleteMany(and(PlayerIds.id eq playerId.id, Namespace eq namespace))
        userTimelineCol.deleteOne(and(PlayerId.id eq playerId.id, Namespace eq namespace))
        MongoUserLock.deleteLock(playerId.id)
    }

    override fun removeClient(namespace: String, clientId: String) {
        clientIdCol.findOneById(clientId)?.userIds?.forEach { remove(namespace, PlayerId(it)) }
        clientIdCol.deleteOneById(clientId)
    }

    override fun loadWithoutDialogs(namespace: String, userId: PlayerId): UserTimeline {
        val timelineId = timelineId(userId.id, namespace)
        val timeline = userTimelineCol.findOneById(timelineId)?.copy(playerId = userId)
        return if (timeline == null) {
            logger.debug { "no timeline for user $userId" }
            UserTimeline(userId)
        } else {
            timeline.toUserTimeline()
        }
    }

    override fun loadByTemporaryIdsWithoutDialogs(namespace: String, temporaryIds: List): List {
        return userTimelineCol.find(TemporaryIds `in` (temporaryIds), Namespace eq namespace)
            .map { it.toUserTimeline() }.toList()
    }

    private fun loadLastValidGroupDialogCol(namespace: String, groupId: String): DialogCol? {
        return dialogCol.aggregate(
            match(
                Namespace eq namespace,
                GroupId eq groupId,
                LastUpdateDate gt now().minusSeconds(dialogMaxValidityInSeconds)
            ),
            sort(
                descending(LastUpdateDate)
            ),
            limit(1)
        ).firstOrNull()
    }

    private fun loadLastValidDialogCol(namespace: String, userId: PlayerId): DialogCol? {
        return dialogCol.aggregate(
            match(
                PlayerIds.id eq userId.id,
                Namespace eq namespace,
                LastUpdateDate gt now().minusSeconds(dialogMaxValidityInSeconds)
            ),
            sort(
                descending(LastUpdateDate)
            ),
            limit(1)
        ).firstOrNull()
    }

    private fun loadLastValidDialog(
        namespace: String,
        userId: PlayerId,
        groupId: String? = null,
        storyDefinitionProvider: (String) -> StoryDefinition
    ): Dialog? {
        return try {
            (groupId?.let { loadLastValidGroupDialogCol(namespace, it) } ?: loadLastValidDialogCol(namespace, userId))
                ?.toDialog(storyDefinitionProvider)
        } catch (e: Exception) {
            logger.error(e)
            null
        }
    }

    override fun search(query: UserReportQuery): UserReportQueryResult {
        with(query) {
            val applicationsIds = getApplicationIds(query.namespace, query.nlpModel)
            if (applicationsIds.isEmpty()) {
                return UserReportQueryResult(0)
            }
            val filter =
                and(
                    ApplicationIds `in` applicationsIds.filter { it.isNotEmpty() },
                    Namespace eq query.namespace,
                    if (name.isNullOrBlank()) null
                    else UserTimelineCol_.UserPreferences.lastName.regex(name!!.trim(), "i"),
                    if (from == null) null else LastUpdateDate gt from?.toInstant(),
                    if (to == null) null else LastUpdateDate lt to?.toInstant(),
                    if (flags.isEmpty()) null
                    else flags.flatMap {
                        "userState.flags.${it.key}".let { key ->
                            listOfNotNull(
                                if (it.value == null) null else "{'$key.value':${it.value!!.json}}",
                                "{$or:[{'$key.expirationDate':{$gt:${now().json}}},{'$key.expirationDate':{$type:10}}]}"
                            )
                        }
                    }.joinToString(",", "{$and:[", "]}").bson,
                    if (query.displayTests) null else UserTimelineCol_.UserPreferences.test eq false
                )
            logger.debug { "user search query: $filter" }
            val c = userTimelineCol.withReadPreference(secondaryPreferred())
            val count = c.countDocuments(filter, defaultCountOptions)
            logger.debug { "count: $count" }
            return if (count > start) {
                val list = c.find(filter)
                    .skip(start.toInt())
                    .limit(size)
                    .descendingSort(LastUpdateDate)
                    .map { it.toUserReport() }
                    .toList()
                UserReportQueryResult(count, start, start + list.size, list)
            } else {
                UserReportQueryResult(0, 0, 0, emptyList())
            }
        }
    }

    override fun search(query: AnalyticsQuery): List {
        with(query) {
            val applicationsIds = getApplicationIds(query.namespace, query.nlpModel)
            if (applicationsIds.isEmpty()) {
                return emptyList()
            }
            val filter =
                and(
                    ApplicationIds `in` applicationsIds.filter { it.isNotEmpty() },
                    Namespace eq query.namespace,
                    LastUpdateDate gt from.toInstant(ZoneOffset.UTC),
                    LastUpdateDate lt to.toInstant(ZoneOffset.UTC)
                )
            logger.debug { "user analytics search query: $filter" }
            val c = userTimelineCol.withReadPreference(secondaryPreferred())
            return c.find(filter).ascendingSort(LastUserActionDate)
                .map { it.toUserAnalytics() }.toList()
        }
    }

    override fun search(query: DialogReportQuery): DialogReportQueryResult {
        with(query) {
            val applicationsIds = getApplicationIds(query.namespace, query.nlpModel)
            if (applicationsIds.isEmpty()) {
                return DialogReportQueryResult(0)
            }
            val dialogIds = if (query.text.isNullOrBlank()) {
                emptySet()
            } else {
                if (query.exactMatch) {
                    dialogTextCol.find(Text eq textKey(query.text!!.trim())).map { it.dialogId }.toSet()
                } else {
                    dialogTextCol
                        .find(Text.regex(textKey(query.text!!.trim()), "i"))
                        .map { it.dialogId }
                        .toSet()
                }
            }
            if (dialogIds.isEmpty() && !query.text.isNullOrBlank()) {
                return DialogReportQueryResult(0, 0, 0, emptyList())
            }
            val filter = and(
                DialogCol_.ApplicationIds `in` applicationsIds.filter { it.isNotEmpty() },
                Namespace eq query.namespace,
                if (query.playerId != null || query.displayTests) null else Test eq false,
                if (query.playerId == null) null else PlayerIds.id eq query.playerId!!.id,
                if (dialogIds.isEmpty()) null else _id `in` dialogIds,
                if (from == null) null else DialogCol_.LastUpdateDate gt from?.toInstant(),
                if (to == null) null else DialogCol_.LastUpdateDate lt to?.toInstant(),
                if (connectorType == null) null else Stories.actions.state.targetConnectorType.id eq connectorType!!.id,
                if (query.intentName.isNullOrBlank()) null else Stories.currentIntent.name_ eq query.intentName,
                if (query.ratings.isNotEmpty()) DialogCol_.Rating `in` query.ratings.toSet() else null,
                if (query.applicationId.isNullOrBlank()) null else  DialogCol_.ApplicationIds `in` setOf( query.applicationId),
                if (query.isGenAiRagDialog == true) Stories.actions.botMetadata.isGenAiRagAnswer eq true else null
            )
            logger.debug { "dialog search query: $filter" }
            val c = dialogCol.withReadPreference(secondaryPreferred())
            val count = c.countDocuments(filter, defaultCountOptions)
            return if (count > start) {
                val list = c.find(filter)
                    .skip(start.toInt())
                    .limit(size)
                    .descendingSort(LastUpdateDate)
                    .run {
                        map { it.toDialogReport() }
                            .toList()
                    }
                DialogReportQueryResult(count, start, start + list.size, list)
            } else {
                DialogReportQueryResult(0, 0, 0, emptyList())
            }
        }
    }

    override fun intents(namespace: String,nlpModel : String): Set {
        val applicationsIds = getApplicationIds(namespace, nlpModel)


        return dialogCol.distinct(
             Stories.actions.state.intent,
            and(DialogCol_.ApplicationIds `in` applicationsIds.filter { it.isNotEmpty() })
        ).filterNotNull().toSet()

    }


    override fun findBotDialogStats(query: DialogReportQuery): RatingReportQueryResult? {
        val applicationsIds = getApplicationIds(query.namespace, query.nlpModel)
        val matchConditions = and(
            DialogCol_.ApplicationIds `in` applicationsIds.filter { it.isNotEmpty() },
            Namespace eq query.namespace,
            Test eq false,
            DialogCol_.Rating `in` setOf(1, 2, 3, 4, 5)
        )
        val dialogRatingGroup = group(
            DialogCol_.Rating from DialogCol_.Rating,
            ParseRequestSatisfactionStatCol_.Count sum 1,
            ParseRequestSatisfactionStatCol_.Rating avg ParseRequestSatisfactionStatCol_.Rating
        )
        val dialogColAggregation =
            dialogCol.aggregate(match(matchConditions), dialogRatingGroup)
        val dialogRatings = dialogColAggregation.map { DialogRating(it.rating , it.count) }.toList()
        if (dialogRatings.isNotEmpty()){
            val nb = dialogRatings.sumByLong { it.nbUsers!!.toLong() }
            val avg = dialogRatings.sumOf { it.nbUsers!! * it.rating!! } / nb
            return RatingReportQueryResult(avg,nb.toInt(),dialogRatings)
        }
        return null
    }

    override fun getDialog(id: Id): DialogReport? {
        return dialogCol.findOneById(id)?.toDialogReport()
    }

    override fun getClientDialogs(
        namespace: String,
        clientId: String,
        storyDefinitionProvider: (String) -> StoryDefinition
    ): List {
        val ids = clientIdCol.findOneById(clientId)?.userIds ?: emptySet()
        return if (ids.isEmpty()) {
            emptyList()
        } else {
            dialogCol
                .find(PlayerIds.id `in` ids, Namespace eq namespace)
                .descendingSort(LastUpdateDate)
                .map { it.toDialog(storyDefinitionProvider) }
                .toList()
        }
    }

    override fun getDialogsUpdatedFrom(
        namespace: String,
        from: Instant,
        storyDefinitionProvider: (String) -> StoryDefinition
    ): List {
        return dialogCol
            .find(and(LastUpdateDate gt from, Namespace eq namespace))
            .map { it.toDialog(storyDefinitionProvider) }
            .toList()
    }

    private fun addSnapshot(dialog: Dialog): SnapshotCol {
        val snapshot = Snapshot(dialog)
        val existingSnapshot = snapshotCol.findOneById(dialog.id)
        return if (existingSnapshot == null) {
            SnapshotCol(dialog.id, listOf(snapshot))
                .also { snapshotCol.insertOne(it) }
        } else {
            existingSnapshot.copy(
                snapshots = existingSnapshot.snapshots + snapshot,
                lastUpdateDate = now()
            ).also { snapshotCol.save(it) }
        }
    }

    private fun addArchivedValues(dialog: Dialog) {
        dialog.state.entityValues.values.filter { it.hasBeanUpdatedInBus }
            .forEach {
                logger.debug { "save archived values for $it" }
                archivedEntityValuesCol.save(ArchivedEntityValuesCol(it.previousValues, it.stateValueId))
            }
    }

    override fun getSnapshots(dialogId: Id): List {
        return try {
            snapshotCol.findOneById(dialogId)?.snapshots ?: emptyList()
        } catch (e: Exception) {
            logger.error(e)
            emptyList()
        }
    }

    override fun getLastStoryId(namespace: String, playerId: PlayerId): String? {
        return try {
            loadLastValidDialogCol(namespace, playerId)?.stories?.lastOrNull()?.storyDefinitionId
        } catch (e: Exception) {
            logger.error(e)
            null
        }
    }

    override fun getArchivedEntityValues(
        stateValueId: Id,
        oldActionsMap: Map, Action>
    ): List {
        logger.debug { "load archived values for $stateValueId" }
        return try {
            archivedEntityValuesCol.findOneById(stateValueId)
                ?.values?.map { it.toArchivedEntityValue(oldActionsMap) }
                ?: emptyList()
        } catch (e: Exception) {
            logger.error(e)
            emptyList()
        }
    }
}




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