Core/Conversation: Implemented conversation flags

Port From (https://github.com/TrinityCore/TrinityCore/commit/de23262c654ff208ae8ed75c815facf017634afe)

Source/Framework/Constants/GossipConst.cs

@@ -1,6 +1,8 @@
 // Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
 // Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
 
+using System;
+
 namespace Framework.Constants
 {
     public enum GossipOption
@@ -164,4 +166,13 @@ namespace Framework.Constants
         None = 0x0,
         QuestLabelPrepend = 0x1
     }
+
+    [Flags]
+    public enum ConversationFlags
+    {
+        None = 0x00,
+        MultipleConversationType = 0x01, // NYI purpose unknown
+        IsTalkingHeadConversation = 0x02, // implicitly implemented when conversation_actors.ActivePlayerObject == 0 && conversation_actors.NoActorObject == 0 && conversation_actors.ConversationActorGuid == 0
+        AllowWithoutSpawnedActor = 0x04,
+    }
 }

Source/Game/DataStorage/ConversationDataStorage.cs

@@ -1,11 +1,10 @@
 // Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
 // Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
 
+using Framework.Constants;
 using Framework.Database;
-using System;
 using System.Collections.Generic;
 using System.Linq;
-using Game.Entities;
 
 namespace Game.DataStorage
 {
@@ -115,7 +114,7 @@ namespace Game.DataStorage
                 return lineId;
             }
 
-            SQLResult templateResult = DB.World.Query("SELECT Id, FirstLineId, TextureKitId, ScriptName FROM conversation_template");
+            SQLResult templateResult = DB.World.Query("SELECT Id, FirstLineId, TextureKitId, Flags, ScriptName FROM conversation_template");
             if (!templateResult.IsEmpty())
             {
                 uint oldMSTime = Time.GetMSTime();
@@ -126,7 +125,8 @@ namespace Game.DataStorage
                     conversationTemplate.Id = templateResult.Read<uint>(0);
                     conversationTemplate.FirstLineId = templateResult.Read<uint>(1);
                     conversationTemplate.TextureKitId = templateResult.Read<uint>(2);
-                    conversationTemplate.ScriptId = Global.ObjectMgr.GetScriptId(templateResult.Read<string>(3));
+                    conversationTemplate.Flags = (ConversationFlags)templateResult.Read<byte>(3);
+                    conversationTemplate.ScriptId = Global.ObjectMgr.GetScriptId(templateResult.Read<string>(4));
 
                     conversationTemplate.Actors = actorsByConversation.TryGetValue(conversationTemplate.Id, out var actors) ? actors.ToList() : new();
 
@@ -327,6 +327,7 @@ namespace Game.DataStorage
         public uint Id;
         public uint FirstLineId;     // Link to ConversationLine.db2
         public uint TextureKitId;    // Background texture
+        public ConversationFlags Flags = ConversationFlags.None;
         public uint ScriptId;
 
         public List<ConversationActorTemplate> Actors = new();

Source/Game/Entities/Conversation.cs

@@ -168,13 +168,17 @@ namespace Game.Entities
 
         public bool Start()
         {
-            foreach (ConversationLine line in m_conversationData.Lines.GetValue())
+            ConversationTemplate conversationTemplate = Global.ConversationDataStorage.GetConversationTemplate(GetEntry()); // never null, already checked in ::Create / ::CreateConversation
+            if (!conversationTemplate.Flags.HasFlag(ConversationFlags.AllowWithoutSpawnedActor))
             {
-                ConversationActorField actor = line.ActorIndex < m_conversationData.Actors.Size() ? m_conversationData.Actors[line.ActorIndex] : null;
-                if (actor == null || (actor.CreatureID == 0 && actor.ActorGUID.IsEmpty() && actor.NoActorObject == 0))
+                foreach (ConversationLine line in m_conversationData.Lines.GetValue())
                 {
-                    Log.outError(LogFilter.Conversation, $"Failed to create conversation (Id: {GetEntry()}) due to missing actor (Idx: {line.ActorIndex}).");
-                    return false;
+                    ConversationActorField actor = line.ActorIndex < m_conversationData.Actors.Size() ? m_conversationData.Actors[line.ActorIndex] : null;
+                    if (actor == null || (actor.CreatureID == 0 && actor.ActorGUID.IsEmpty() && actor.NoActorObject == 0))
+                    {
+                        Log.outError(LogFilter.Conversation, $"Failed to create conversation (Id: {GetEntry()}) due to missing actor (Idx: {line.ActorIndex}).");
+                        return false;
+                    }
                 }
             }