add timers repo and timers handler

triggers/timer/src/commonMain/kotlin/ButtonsBuilder.kt

@@ -4,8 +4,11 @@ import com.soywiz.klock.DateTime
 import com.soywiz.klock.DateTimeTz
 import com.soywiz.klock.Month
 import com.soywiz.klock.Year
+import dev.inmo.micro_utils.coroutines.runCatchingSafely
 import dev.inmo.plaguposter.common.SuccessfulSymbol
+import dev.inmo.plaguposter.posts.models.Post
 import dev.inmo.plaguposter.posts.models.PostId
+import dev.inmo.tgbotapi.extensions.api.answers.answer
 import dev.inmo.tgbotapi.extensions.api.edit.edit
 import dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContext
 import dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling.onMessageDataCallbackQuery
@@ -38,7 +41,9 @@ object ButtonsBuilder {
         dataButton(SuccessfulSymbol, "$changeDateDataPrefix $postId $unixMillis")
     }
 
-    suspend fun BehaviourContext.includeKeyboardHandling() {
+    suspend fun BehaviourContext.includeKeyboardHandling(
+        onSavePublishingTime: suspend (PostId, DateTime) -> Boolean
+    ) {
         fun buildKeyboard(
             prefix: String,
             postId: PostId,
@@ -180,5 +185,21 @@ object ButtonsBuilder {
                 oldDateTime.offset
             )
         }
+
+        onMessageDataCallbackQuery(Regex("$changeDateDataPrefix .*")) {
+            val (_, rawPostId, rawDateTimeMillis) = it.data.split(" ")
+            val currentMillis = rawDateTimeMillis.toLongOrNull() ?: return@onMessageDataCallbackQuery
+            val currentDateTime = DateTime(currentMillis)
+            val postId = PostId(rawPostId)
+
+            val success = runCatchingSafely {
+                onSavePublishingTime(postId, currentDateTime)
+            }.getOrElse { false }
+
+            answer(
+                it,
+                if (success) "Successfully set timer" else "Unable to set timer"
+            )
+        }
     }
 }

triggers/timer/src/commonMain/kotlin/TimersHandler.kt

@@ -0,0 +1,57 @@
+package dev.inmo.plaguposter.triggers.timer
+
+import com.soywiz.klock.DateTime
+import dev.inmo.micro_utils.coroutines.launchSafelyWithoutExceptions
+import dev.inmo.micro_utils.coroutines.plus
+import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptions
+import dev.inmo.micro_utils.repos.unset
+import dev.inmo.plaguposter.posts.models.PostId
+import dev.inmo.plaguposter.posts.sending.PostPublisher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+
+class TimersHandler(
+    private val timersRepo: TimersRepo,
+    private val publisher: PostPublisher,
+    private val scope: CoroutineScope
+) {
+    private var currentPostAndJob: Pair<PostId, Job>? = null
+    private val currentJobMutex = Mutex()
+
+    init {
+        (flowOf(Unit) + timersRepo.onNewValue + timersRepo.onValueRemoved).subscribeSafelyWithoutExceptions(scope) {
+            refreshPublishingJob()
+        }
+    }
+
+    private suspend fun refreshPublishingJob() {
+        val minimal = timersRepo.getMinimalDateTimePost()
+
+        currentJobMutex.withLock {
+            if (minimal ?.first == currentPostAndJob ?.first) {
+                return@withLock
+            }
+
+            currentPostAndJob ?.second ?.cancel()
+
+            currentPostAndJob = minimal ?.let { (postId, dateTime) ->
+                postId to scope.launchSafelyWithoutExceptions {
+                    val now = DateTime.now()
+                    val span = dateTime - now
+
+                    delay(span.millisecondsLong)
+
+                    publisher.publish(postId)
+
+                    timersRepo.unset(postId)
+
+                    refreshPublishingJob()
+                }
+            }
+        }
+    }
+}

triggers/timer/src/commonMain/kotlin/TimersRepo.kt

@@ -0,0 +1,9 @@
+package dev.inmo.plaguposter.triggers.timer
+
+import com.soywiz.klock.DateTime
+import dev.inmo.micro_utils.repos.KeyValueRepo
+import dev.inmo.plaguposter.posts.models.PostId
+
+interface TimersRepo : KeyValueRepo<PostId, DateTime> {
+    suspend fun getMinimalDateTimePost(): Pair<PostId, DateTime>?
+}

triggers/timer/src/jvmMain/kotlin/Plugin.kt

@@ -2,8 +2,10 @@ package dev.inmo.plaguposter.triggers.timer
 
 import com.soywiz.klock.DateTime
 import dev.inmo.micro_utils.coroutines.runCatchingSafely
+import dev.inmo.micro_utils.repos.set
 import dev.inmo.plagubot.Plugin
 import dev.inmo.plaguposter.posts.repo.ReadPostsRepo
+import dev.inmo.plaguposter.triggers.timer.repo.ExposedTimersRepo
 import dev.inmo.tgbotapi.extensions.api.edit.edit
 import dev.inmo.tgbotapi.extensions.api.send.send
 import dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContext
@@ -12,15 +14,22 @@ import kotlinx.serialization.json.*
 import org.jetbrains.exposed.sql.Database
 import org.koin.core.Koin
 import org.koin.core.module.Module
+import org.koin.dsl.binds
 
 object Plugin : Plugin {
     override fun Module.setupDI(database: Database, params: JsonObject) {
+        single { ExposedTimersRepo(get(), get(), get()) } binds arrayOf(TimersRepo::class)
+        single(createdAtStart = true) { TimersHandler(get(), get(), get()) }
     }
 
     override suspend fun BehaviourContext.setupBotPlugin(koin: Koin) {
         val postsRepo = koin.get<ReadPostsRepo>()
+        val timersRepo = koin.get<TimersRepo>()
         with(ButtonsBuilder) {
-            includeKeyboardHandling()
+            includeKeyboardHandling { postId, dateTime ->
+                timersRepo.set(postId, dateTime)
+                true
+            }
         }
         onCommand("test") {
             val reply = it.replyTo ?: return@onCommand

triggers/timer/src/jvmMain/kotlin/repo/ExposedTimersRepo.kt

@@ -0,0 +1,62 @@
+package dev.inmo.plaguposter.triggers.timer.repo
+
+import com.soywiz.klock.DateTime
+import dev.inmo.micro_utils.common.firstNotNull
+import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptions
+import dev.inmo.micro_utils.pagination.paginate
+import dev.inmo.micro_utils.repos.exposed.initTable
+import dev.inmo.micro_utils.repos.exposed.keyvalue.AbstractExposedKeyValueRepo
+import dev.inmo.micro_utils.repos.unset
+import dev.inmo.plaguposter.posts.models.PostId
+import dev.inmo.plaguposter.posts.repo.PostsRepo
+import dev.inmo.plaguposter.triggers.timer.TimersRepo
+import kotlinx.coroutines.CoroutineScope
+import org.jetbrains.exposed.sql.Column
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.ISqlExpressionBuilder
+import org.jetbrains.exposed.sql.Op
+import org.jetbrains.exposed.sql.ResultRow
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.statements.InsertStatement
+import org.jetbrains.exposed.sql.statements.UpdateBuilder
+import org.jetbrains.exposed.sql.transactions.transaction
+
+class ExposedTimersRepo(
+    database: Database,
+    postsRepo: PostsRepo,
+    scope: CoroutineScope
+) : TimersRepo, AbstractExposedKeyValueRepo<PostId, DateTime>(
+    database,
+    "timers"
+) {
+    override val keyColumn = text("post_id")
+    private val dateTimeColumn = long("date_time")
+    override val selectById: ISqlExpressionBuilder.(PostId) -> Op<Boolean> = { keyColumn.eq(it.string) }
+    override val selectByValue: ISqlExpressionBuilder.(DateTime) -> Op<Boolean> = { dateTimeColumn.eq(it.unixMillisLong) }
+    override val ResultRow.asKey: PostId
+        get() = PostId(get(keyColumn))
+    override val ResultRow.asObject: DateTime
+        get() = DateTime(get(dateTimeColumn))
+
+    val postsRepoListeningJob = postsRepo.deletedObjectsIdsFlow.subscribeSafelyWithoutExceptions(scope) {
+        unset(it)
+    }
+
+    init {
+        initTable()
+    }
+
+    override fun update(k: PostId, v: DateTime, it: UpdateBuilder<Int>) {
+        it[dateTimeColumn] = v.unixMillisLong
+    }
+
+    override fun insertKey(k: PostId, v: DateTime, it: InsertStatement<Number>) {
+        it[keyColumn] = k.string
+    }
+
+    override suspend fun getMinimalDateTimePost(): Pair<PostId, DateTime>? = transaction(database) {
+        selectAll().orderBy(dateTimeColumn).limit(1).firstOrNull() ?.let {
+            PostId(it[keyColumn]) to DateTime(it[dateTimeColumn])
+        }
+    }
+}