Correct classname

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/contact/Contact.kt

@@ -33,12 +33,13 @@ import net.mamoe.mirai.utils.WeakRefProperty
  * @author Him188moe
  */
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
-actual abstract class Contact : CoroutineScope, ContactJavaHappyAPI() {
+actual abstract class Contact : CoroutineScope, ContactJavaFriendlyAPI() {
     /**
      * 这个联系人所属 [Bot].
      */
     @WeakRefProperty
     actual abstract val bot: Bot
+
     /**
      * 可以是 QQ 号码或者群号码.
      *

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/contact/ContactJavaFriendlyAPI.kt

@@ -33,11 +33,11 @@ import java.util.concurrent.Future
 @MiraiInternalAPI
 @JavaHappyAPI
 @Suppress("INAPPLICABLE_JVM_NAME", "FunctionName", "unused")
-actual abstract class ContactJavaHappyAPI {
+actual abstract class ContactJavaFriendlyAPI {
 
     private inline fun <R> runBlocking(crossinline block: suspend Contact.() -> R): R {
         @Suppress("CAST_NEVER_SUCCEEDS")
-        return kotlinx.coroutines.runBlocking { block(this@ContactJavaHappyAPI as Contact) }
+        return kotlinx.coroutines.runBlocking { block(this@ContactJavaFriendlyAPI as Contact) }
     }
 
     private inline fun <R> future(crossinline block: suspend Contact.() -> R): Future<R> {
@@ -207,10 +207,10 @@ actual abstract class ContactJavaHappyAPI {
 @Suppress("INAPPLICABLE_JVM_NAME", "FunctionName", "unused", "unused")
 @MiraiInternalAPI
 @JavaHappyAPI
-actual abstract class MemberJavaHappyAPI : QQ() {
+actual abstract class MemberJavaFriendlyAPI : QQ() {
     private inline fun <R> runBlocking(crossinline block: suspend Member.() -> R): R {
         @Suppress("CAST_NEVER_SUCCEEDS")
-        return kotlinx.coroutines.runBlocking { block(this@MemberJavaHappyAPI as Member) }
+        return kotlinx.coroutines.runBlocking { block(this@MemberJavaFriendlyAPI as Member) }
     }
 
     private inline fun <R> future(crossinline block: suspend Member.() -> R): Future<R> {

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/contact/Member.kt

@@ -26,7 +26,7 @@ import net.mamoe.mirai.utils.WeakRefProperty
  */
 @Suppress("INAPPLICABLE_JVM_NAME")
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
-actual abstract class Member : MemberJavaHappyAPI() {
+actual abstract class Member : MemberJavaFriendlyAPI() {
     /**
      * 所在的群.
      */

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

@@ -36,7 +36,7 @@ import kotlin.jvm.JvmSynthetic
  * @author Him188moe
  */ // 不要删除多平台结构 !!! kotlin bug
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
-expect abstract class Contact() : CoroutineScope, ContactJavaHappyAPI {
+expect abstract class Contact() : CoroutineScope, ContactJavaFriendlyAPI {
     /**
      * 这个联系人所属 [Bot].
      */

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

@@ -23,6 +23,7 @@ import net.mamoe.mirai.message.data.OfflineGroupImage
 import net.mamoe.mirai.utils.ExternalImage
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.OverFileSizeMaxException
+import net.mamoe.mirai.utils.SinceMirai
 import kotlin.jvm.JvmSynthetic
 
 /**
@@ -147,7 +148,6 @@ expect abstract class Group() : Contact, CoroutineScope {
     abstract operator fun contains(id: Long): Boolean
 
 
-
     /**
      * 让机器人退出这个群. 机器人必须为非群主才能退出. 否则将会失败
      */
@@ -233,9 +233,6 @@ internal object CommonGroupCalculations {
             in 310 + 3800 - 310..499 + 3800 - 310 -> left -= 3800 - 310
         }
 
-        return left * 1000000L + groupUin % 1000000L
-    }
-}
 
 /**
  * 返回机器人是否正在被禁言
@@ -243,3 +240,41 @@ internal object CommonGroupCalculations {
  * @see Group.botMuteRemaining 剩余禁言时间
  */
 inline val Group.isBotMuted: Boolean get() = this.botMuteRemaining != 0
+
+
+internal object CommonGroupCalculations {
+    /**
+     * by @kar98k
+     */
+    fun calculateGroupUinByGroupCode(groupCode: Long): Long {
+        var left: Long = groupCode / 1000000L
+
+        when (left) {
+            in 0..10 -> left += 202
+            in 11..19 -> left += 480 - 11
+            in 20..66 -> left += 2100 - 20
+            in 67..156 -> left += 2010 - 67
+            in 157..209 -> left += 2147 - 157
+            in 210..309 -> left += 4100 - 210
+            in 310..499 -> left += 3800 - 310
+        }
+
+        return left * 1000000L + groupCode % 1000000L
+    }
+
+    fun calculateGroupCodeByGroupUin(groupUin: Long): Long {
+        var left: Long = groupUin / 1000000L
+
+        when (left) {
+            in 0 + 202..10 + 202 -> left -= 202
+            in 11 + 480 - 11..19 + 480 - 11 -> left -= 480 - 11
+            in 20 + 2100 - 20..66 + 2100 - 20 -> left -= 2100 - 20
+            in 67 + 2010 - 67..156 + 2010 - 67 -> left -= 2010 - 67
+            in 157 + 2147 - 157..209 + 2147 - 157 -> left -= 2147 - 157
+            in 210 + 4100 - 210..309 + 4100 - 210 -> left -= 4100 - 210
+            in 310 + 3800 - 310..499 + 3800 - 310 -> left -= 3800 - 310
+        }
+
+        return left * 1000000L + groupUin % 1000000L
+    }
+}

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

@@ -27,7 +27,7 @@ import kotlin.time.ExperimentalTime
  */ // 不要删除多平台结构, kotlin bug
 @Suppress("INAPPLICABLE_JVM_NAME")
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
-expect abstract class Member() : MemberJavaHappyAPI {
+expect abstract class Member() : MemberJavaFriendlyAPI {
     /**
      * 所在的群.
      */

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

@@ -17,11 +17,11 @@ import net.mamoe.mirai.utils.MiraiInternalAPI
  */
 @MiraiInternalAPI
 @JavaHappyAPI
-expect abstract class ContactJavaHappyAPI
+expect abstract class ContactJavaFriendlyAPI
 
 /**
  * [Member] 中为了让 `Java` 更容易调用的 API
  */
 @MiraiInternalAPI
 @JavaHappyAPI
-expect abstract class MemberJavaHappyAPI : QQ
+expect abstract class MemberJavaFriendlyAPI : QQ

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/contact/Contact.kt

@@ -32,12 +32,13 @@ import net.mamoe.mirai.utils.WeakRefProperty
  * @author Him188moe
  */
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
-actual abstract class Contact : CoroutineScope, ContactJavaHappyAPI() {
+actual abstract class Contact : CoroutineScope, ContactJavaFriendlyAPI() {
     /**
      * 这个联系人所属 [Bot].
      */
     @WeakRefProperty
     actual abstract val bot: Bot
+
     /**
      * 可以是 QQ 号码或者群号码.
      *

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/contact/ContactJavaFriendlyAPI.kt

@@ -33,11 +33,11 @@ import java.util.concurrent.Future
 @MiraiInternalAPI
 @JavaHappyAPI
 @Suppress("INAPPLICABLE_JVM_NAME", "FunctionName", "unused")
-actual abstract class ContactJavaHappyAPI {
+actual abstract class ContactJavaFriendlyAPI {
 
     private inline fun <R> runBlocking(crossinline block: suspend Contact.() -> R): R {
         @Suppress("CAST_NEVER_SUCCEEDS")
-        return kotlinx.coroutines.runBlocking { block(this@ContactJavaHappyAPI as Contact) }
+        return kotlinx.coroutines.runBlocking { block(this@ContactJavaFriendlyAPI as Contact) }
     }
 
     private inline fun <R> future(crossinline block: suspend Contact.() -> R): Future<R> {
@@ -205,10 +205,10 @@ actual abstract class ContactJavaHappyAPI {
 @Suppress("INAPPLICABLE_JVM_NAME", "FunctionName", "unused", "unused")
 @MiraiInternalAPI
 @JavaHappyAPI
-actual abstract class MemberJavaHappyAPI : QQ() {
+actual abstract class MemberJavaFriendlyAPI : QQ() {
     private inline fun <R> runBlocking(crossinline block: suspend Member.() -> R): R {
         @Suppress("CAST_NEVER_SUCCEEDS")
-        return kotlinx.coroutines.runBlocking { block(this@MemberJavaHappyAPI as Member) }
+        return kotlinx.coroutines.runBlocking { block(this@MemberJavaFriendlyAPI as Member) }
     }
 
     private inline fun <R> future(crossinline block: suspend Member.() -> R): Future<R> {

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/contact/Member.kt

@@ -26,12 +26,13 @@ import net.mamoe.mirai.utils.WeakRefProperty
  */
 @OptIn(MiraiInternalAPI::class, JavaHappyAPI::class)
 @Suppress("INAPPLICABLE_JVM_NAME")
-actual abstract class Member : MemberJavaHappyAPI() {
+actual abstract class Member : MemberJavaFriendlyAPI() {
     /**
      * 所在的群.
      */
     @WeakRefProperty
     actual abstract val group: Group
+
     /**
      * 成员的权限, 动态更新.
      *