add support of voter_chat in PollAnswer

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt

@@ -289,6 +289,7 @@ const val pinnedMessageField = "pinned_message"
 const val activeUsernamesField = "active_usernames"
 const val customTitleField = "custom_title"
 const val optionIdsField = "option_ids"
+const val voterChatField = "voter_chat"
 const val ipAddressField = "ip_address"
 const val linkedChatIdField = "linked_chat_id"
 const val hasHiddenMembersField = "has_hidden_members"

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/polls/PollAnswer.kt

@@ -2,19 +2,95 @@ package dev.inmo.tgbotapi.types.polls
 
 import dev.inmo.tgbotapi.abstracts.FromUser
 import dev.inmo.tgbotapi.types.*
+import dev.inmo.tgbotapi.types.chat.ChannelChat
+import dev.inmo.tgbotapi.types.chat.CommonBot
 import dev.inmo.tgbotapi.types.chat.User
 import kotlinx.serialization.*
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
 
 @Serializable
-data class PollAnswer(
-    @SerialName(pollIdField)
-    val pollId: PollIdentifier,
-    @SerialName(userField)
-    override val user: User,
-    @SerialName(optionIdsField)
+sealed interface PollAnswer: FromUser {
+    val pollId: PollIdentifier
+    override val user: User
     val chosen: List<Int>
-) : FromUser {
     @Transient
     override val from: User
         get() = user
+
+    @Serializable
+    data class Common(
+        @SerialName(pollIdField)
+        override val pollId: PollIdentifier,
+        @SerialName(userField)
+        override val user: User,
+        @SerialName(optionIdsField)
+        override val chosen: List<Int>,
+    ) : PollAnswer
+
+    @Serializable
+    data class InChannel(
+        @SerialName(pollIdField)
+        override val pollId: PollIdentifier,
+        @SerialName(voterChatField)
+        val voterChat: ChannelChat,
+        @SerialName(optionIdsField)
+        override val chosen: List<Int>
+    ) : PollAnswer {
+        @SerialName(userField)
+        override val user: User = defaultUser
+
+        companion object {
+            val defaultUser = CommonBot(
+                UserId(136817688L),
+                "",
+                "",
+                Username("@Channel_Bot")
+            )
+        }
+    }
+
+    companion object : KSerializer<PollAnswer> {
+        @Serializable
+        private data class PollAnswerSurrogate(
+            @SerialName(pollIdField)
+            val pollId: PollIdentifier,
+            @SerialName(userField)
+            val user: User,
+            @SerialName(optionIdsField)
+            val chosen: List<Int>,
+            @SerialName(voterChatField)
+            val voterChat: ChannelChat?
+        )
+        operator fun invoke(
+            pollId: PollIdentifier,
+            user: User,
+            chosen: List<Int>,
+        ) = Common(pollId, user, chosen)
+
+        override val descriptor: SerialDescriptor
+            get() = PollAnswerSurrogate.serializer().descriptor
+
+        override fun deserialize(decoder: Decoder): PollAnswer {
+            val surrogate = PollAnswerSurrogate.serializer().deserialize(decoder)
+            return if (surrogate.voterChat != null) {
+                InChannel(surrogate.pollId, surrogate.voterChat, surrogate.chosen)
+            } else {
+                Common(surrogate.pollId, surrogate.user, surrogate.chosen)
+            }
+        }
+
+        override fun serialize(encoder: Encoder, value: PollAnswer) {
+            PollAnswerSurrogate.serializer().serialize(
+                encoder,
+                PollAnswerSurrogate(
+                    value.pollId,
+                    value.user,
+                    value.chosen,
+                    (value as? InChannel) ?.voterChat
+                )
+            )
+        }
+    }
 }