Remove `_lowLevelSendLongGroupMessage`, fix length counting

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/QQAndroidBot.kt

@@ -371,15 +371,13 @@ internal abstract class QQAndroidBotBase constructor(
 
     @LowLevelAPI
     @MiraiExperimentalAPI
-    override suspend fun _lowLevelSendLongGroupMessage(groupCode: Long, message: Message): MessageReceipt<Group> {
-        val chain = message.asMessageChain()
-        check(chain.toString().length <= 4500 && chain.count { it is Image } <= 50) { "message is too large. Allow up to 4500 chars or 50 images" }
+    internal suspend fun _lowLevelSendLongGroupMessage(groupCode: Long, message: MessageChain): MessageReceipt<Group> {
         val group = getGroup(groupCode)
 
         val time = currentTimeSeconds
 
         network.run {
-            val data = chain.calculateValidationDataForGroup(
+            val data = message.calculateValidationDataForGroup(
                 sequenceId = client.atomicNextMessageSequenceId(),
                 time = time.toInt(),
                 random = Random.nextInt().absoluteValue.toUInt(),
@@ -433,10 +431,15 @@ internal abstract class QQAndroidBotBase constructor(
 
             return group.sendMessage(
                 RichMessage.longMessage(
-                    brief = chain.toString().let { // already cached
-                        if (it.length > 27) {
-                            it.take(27) + "..."
-                        } else it
+                    brief = message.joinToString(limit = 27){
+                        when(it){
+                            is PlainText -> it.stringValue
+                            is At -> it.display
+                            is AtAll -> it.display
+                            is Image -> "[图片]"
+                            is Face -> "[表情]"
+                            else -> ""
+                        }
                     },
                     resId = resId,
                     timeSeconds = time

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/GroupImpl.kt

@@ -30,8 +30,7 @@ import net.mamoe.mirai.qqandroid.network.highway.HighwayHelper
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.TroopManagement
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.image.ImgStore
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.receive.MessageSvc
-import net.mamoe.mirai.qqandroid.utils.chineseLength
-import net.mamoe.mirai.qqandroid.utils.sumUpTo
+import net.mamoe.mirai.qqandroid.utils.estimateLength
 import net.mamoe.mirai.qqandroid.utils.toIpV4AddressString
 import net.mamoe.mirai.utils.*
 import kotlin.contracts.ExperimentalContracts
@@ -277,30 +276,30 @@ internal class GroupImpl(
     @JvmSynthetic
     override suspend fun sendMessage(message: Message): MessageReceipt<Group> {
         check(!isBotMuted) { "bot is muted. Remaining seconds=$botMuteRemaining" }
-        val event = GroupMessageSendEvent(this, message.asMessageChain()).broadcast()
-        if (event.isCancelled) {
-            throw EventCancelledException("cancelled by GroupMessageSendEvent")
-        }
+
+        val msg: MessageChain
 
         if (message !is LongMessage) {
-            if (event.message.sumUpTo(800) { it, upTo ->
-                    when (it) {
-                        is QuoteReply -> 700
-                        is Image -> 300
-                        is PlainText -> it.stringValue.chineseLength(upTo)
-                        else -> it.toString().length
-                    }
-                } >= 800) {
-                return bot._lowLevelSendLongGroupMessage(this.id, message)
+            val event = GroupMessageSendEvent(this, message.asMessageChain()).broadcast()
+            if (event.isCancelled) {
+                throw EventCancelledException("cancelled by GroupMessageSendEvent")
             }
-        }
+
+            val length = event.message.estimateLength(4501)
+            check(length <= 4500 && event.message.count { it is Image } <= 50) { "message is too large. Allow up to 4500 chars or 50 images" }
+            if (length >= 800) {
+                return bot._lowLevelSendLongGroupMessage(this.id, event.message)
+            }
+
+            msg = event.message
+        } else msg = message.asMessageChain()
 
         lateinit var source: MessageSourceFromSendGroup
         bot.network.run {
             val response: MessageSvc.PbSendMsg.Response = MessageSvc.PbSendMsg.ToGroup(
                 bot.client,
                 id,
-                event.message
+                msg
             ) {
                 source = it
                 source.startWaitingSequenceId(this)

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/utils/type.kt

@@ -12,6 +12,10 @@
 
 package net.mamoe.mirai.qqandroid.utils
 
+import net.mamoe.mirai.message.data.Image
+import net.mamoe.mirai.message.data.MessageChain
+import net.mamoe.mirai.message.data.PlainText
+import net.mamoe.mirai.message.data.QuoteReply
 import kotlin.jvm.JvmMultifileClass
 import kotlin.jvm.JvmName
 
@@ -34,6 +38,16 @@ internal fun String.chineseLength(upTo: Int): Int {
     return this.sumUpTo(upTo) { if (it in '\u0391'..'\uFFE5') 3 else 1 }
 }
 
+internal fun MessageChain.estimateLength(upTo: Int = Int.MAX_VALUE): Int =
+    sumUpTo(upTo) { it, up ->
+        when (it) {
+            is QuoteReply -> 700
+            is Image -> 300
+            is PlainText -> it.stringValue.chineseLength(up)
+            else -> it.toString().chineseLength(up)
+        }
+    }
+
 internal inline fun <T> Iterable<T>.sumUpTo(upTo: Int, selector: (T, remaining: Int) -> Int): Int {
     var sum = 0
     for (element in this) {

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/lowLevelApi.kt

@@ -13,8 +13,6 @@ import kotlinx.coroutines.Job
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.QQ
 import net.mamoe.mirai.data.*
-import net.mamoe.mirai.message.MessageReceipt
-import net.mamoe.mirai.message.data.Message
 import net.mamoe.mirai.message.data.MessageSource
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.MiraiInternalAPI
@@ -142,14 +140,6 @@ interface LowLevelBotAPIAccessor {
     @LowLevelAPI
     @MiraiExperimentalAPI
     suspend fun _lowLevelGetGroupActiveData(groupId: Long): GroupActiveData
-
-    /**
-     * 发送长消息
-     */
-    @SinceMirai("0.31.0")
-    @LowLevelAPI
-    @MiraiExperimentalAPI
-    suspend fun _lowLevelSendLongGroupMessage(groupCode: Long, message: Message): MessageReceipt<Group>
 }
 
 /**