Core/Loot: Enable setting AcquireReason, correct LootMethod definition, fix structure to match sniffs of retail and correct threashold and reason definitions.

src/server/game/Entities/Player/Player.cpp

@@ -8744,12 +8744,26 @@ void Player::SendLoot(ObjectGuid guid, LootType loot_type)
 
     if (permission != NONE_PERMISSION)
     {
+        LootMethod _lootMethod = FREE_FOR_ALL;
+        if (Group* group = GetGroup())
+        {
+            if (Creature* creature = GetMap()->GetCreature(guid))
+            {
+                if (Player* recipient = creature->GetLootRecipient())
+                {
+                    if (group == recipient->GetGroup())
+                        _lootMethod = group->GetLootMethod();
+                }
+            }
+        }
+
         SetLootGUID(guid);
 
         WorldPackets::Loot::LootResponse packet;
         packet.LootObj = guid;
         packet.Owner = loot->GetGUID();
-        packet.LootMethod = loot_type;
+        packet.LootMethod = _lootMethod;
+        packet.AcquireReason = loot_type;
         if (!GetGroup())
             packet.PersonalLooting = true;
         else

src/server/game/Server/Packets/LootPackets.cpp

@@ -26,10 +26,10 @@ WorldPacket const* WorldPackets::Loot::LootResponse::Write()
 {
     _worldPacket << LootObj;
     _worldPacket << Owner;
-    _worldPacket << Threshold;
-    _worldPacket << LootMethod;
-    _worldPacket << AcquireReason;
     _worldPacket << FailureReason;
+    _worldPacket << AcquireReason;
+    _worldPacket << LootMethod;
+    _worldPacket << Threshold;
     _worldPacket << Coins;
     _worldPacket << uint32(Items.size());
     _worldPacket << uint32(Currencies.size());

src/server/game/Server/Packets/LootPackets.h

@@ -64,10 +64,10 @@ namespace WorldPackets
 
             ObjectGuid LootObj;
             ObjectGuid Owner;
-            uint8 Threshold     = 17; // Most common value
-            uint8 LootMethod    = 0;
-            uint8 AcquireReason = 0;
-            uint8 FailureReason = 2; // Most common value
+            uint8 Threshold      = 2; // Most common value
+            uint8 LootMethod     = 0;
+            uint8 AcquireReason  = 0;
+            uint8 FailureReason  = 17; // Most common value
             uint32 Coins        = 0;
             std::vector<LootItem> Items;
             std::vector<LootCurrency> Currencies;