Core/Achievements: Fixed realm first kill achievement restrictions - now only the first group will be able to complete it

Closes #2957

src/server/game/Achievements/AchievementMgr.cpp

@@ -1620,7 +1620,7 @@ bool AchievementMgr::IsCompletedCriteria(AchievementCriteriaEntry const* achieve
     if (achievement->flags & (ACHIEVEMENT_FLAG_REALM_FIRST_REACH | ACHIEVEMENT_FLAG_REALM_FIRST_KILL))
     {
         // someone on this realm has already completed that achievement
-        if (sAchievementMgr->IsRealmCompleted(achievement))
+        if (sAchievementMgr->IsRealmCompleted(achievement, GetPlayer()->GetInstanceId()))
             return false;
     }
 
@@ -2027,10 +2027,7 @@ void AchievementMgr::CompletedAchievement(AchievementEntry const* achievement)
     ca.date = time(NULL);
     ca.changed = true;
 
-    // don't insert for ACHIEVEMENT_FLAG_REALM_FIRST_KILL since otherwise only the first group member would reach that achievement
-    /// @todo where do set this instead?
-    if (!(achievement->flags & ACHIEVEMENT_FLAG_REALM_FIRST_KILL))
-        sAchievementMgr->SetRealmCompleted(achievement);
+    sAchievementMgr->SetRealmCompleted(achievement, GetPlayer()->GetInstanceId());
 
     UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_COMPLETE_ACHIEVEMENT);
     UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_EARN_ACHIEVEMENT_POINTS, achievement->points);
@@ -2405,7 +2402,7 @@ void AchievementGlobalMgr::LoadCompletedAchievements()
             continue;
         }
         else if (achievement->flags & (ACHIEVEMENT_FLAG_REALM_FIRST_REACH | ACHIEVEMENT_FLAG_REALM_FIRST_KILL))
-            m_allCompletedAchievements.insert(achievementId);
+            m_allCompletedAchievements[achievementId] = uint32(0xFFFFFFFF);
     }
     while (result->NextRow());
 
@@ -2582,3 +2579,10 @@ AchievementCriteriaEntry const* AchievementGlobalMgr::GetAchievementCriteria(uin
 {
     return sAchievementCriteriaStore.LookupEntry(criteriaId);
 }
+
+void AchievementGlobalMgr::OnInstanceDestroyed(uint32 instanceId)
+{
+    for (auto& realmCompletion : m_allCompletedAchievements)
+        if (realmCompletion.second == instanceId)
+            realmCompletion.second = uint32(0xFFFFFFFF);
+}

src/server/game/Achievements/AchievementMgr.h

@@ -355,16 +355,29 @@ class AchievementGlobalMgr
             return iter != m_criteriaDataMap.end() ? &iter->second : NULL;
         }
 
-        bool IsRealmCompleted(AchievementEntry const* achievement) const
+        bool IsRealmCompleted(AchievementEntry const* achievement, uint32 instanceId) const
         {
-            return m_allCompletedAchievements.find(achievement->ID) != m_allCompletedAchievements.end();
+            AllCompletedAchievements::const_iterator itr = m_allCompletedAchievements.find(achievement->ID);
+            if (itr == m_allCompletedAchievements.end())
+                return false;
+
+            if (achievement->flags & ACHIEVEMENT_FLAG_REALM_FIRST_KILL)
+                return itr->second != instanceId;
+
+            return true;
         }
 
-        void SetRealmCompleted(AchievementEntry const* achievement)
+        void SetRealmCompleted(AchievementEntry const* achievement, uint32 instanceId)
         {
-            m_allCompletedAchievements.insert(achievement->ID);
+            if (IsRealmCompleted(achievement, instanceId))
+                return;
+                
+            m_allCompletedAchievements[achievement->ID] = instanceId;
         }
 
+        // Removes instanceId as valid id to complete realm first kill achievements
+        void OnInstanceDestroyed(uint32 instanceId);
+
         void LoadAchievementCriteriaList();
         void LoadAchievementCriteriaData();
         void LoadAchievementReferenceList();
@@ -387,7 +400,7 @@ class AchievementGlobalMgr
         // store achievements by referenced achievement id to speed up lookup
         AchievementListByReferencedId m_AchievementListByReferencedId;
 
-        typedef std::set<uint32> AllCompletedAchievements;
+        typedef std::map<uint32 /*achievementId*/, uint32 /*instanceId*/> AllCompletedAchievements;
         AllCompletedAchievements m_allCompletedAchievements;
 
         AchievementRewards m_achievementRewards;

src/server/game/Maps/MapManager.cpp

@@ -36,6 +36,7 @@
 #include "Player.h"
 #include "WorldSession.h"
 #include "Opcodes.h"
+#include "AchievementMgr.h"
 
 MapManager::MapManager()
 {
@@ -393,4 +394,5 @@ void MapManager::FreeInstanceId(uint32 instanceId)
         SetNextInstanceId(instanceId);
 
     _instanceIds[instanceId] = false;
+    sAchievementMgr->OnInstanceDestroyed(instanceId);
 }