Merge pull request #16110 from Treeston/3.3.5-instancerevive

Game/Maps: Clean up instance zone-in handling
(cherry picked from commit eb3dc8a4f064d89b78248a511bcf67f805ea3314)

1 files changed, 19 insertions, 3 deletions

diff --git a/src/server/game/Maps/Map.h b/src/server/game/Maps/Map.h
index 34aa00e4bf9..d51f05bc32a 100644
--- a/src/server/game/Maps/Map.h
+++ b/src/server/game/Maps/Map.h
@@ -365,7 +365,23 @@ class Map : public GridRefManager<NGridType>
 
         uint32 GetInstanceId() const { return i_InstanceId; }
         uint8 GetSpawnMode() const { return (i_spawnMode); }
-        virtual bool CanEnter(Player* /*player*/) { return true; }
+
+        enum EnterState
+        {
+            CAN_ENTER = 0,
+            CANNOT_ENTER_ALREADY_IN_MAP = 1, // Player is already in the map
+            CANNOT_ENTER_NO_ENTRY, // No map entry was found for the target map ID
+            CANNOT_ENTER_UNINSTANCED_DUNGEON, // No instance template was found for dungeon map
+            CANNOT_ENTER_DIFFICULTY_UNAVAILABLE, // Requested instance difficulty is not available for target map
+            CANNOT_ENTER_NOT_IN_RAID, // Target instance is a raid instance and the player is not in a raid group
+            CANNOT_ENTER_CORPSE_IN_DIFFERENT_INSTANCE, // Player is dead and their corpse is not in target instance
+            CANNOT_ENTER_INSTANCE_BIND_MISMATCH, // Player's permanent instance save is not compatible with their group's current instance bind
+            CANNOT_ENTER_TOO_MANY_INSTANCES, // Player has entered too many instances recently
+            CANNOT_ENTER_MAX_PLAYERS, // Target map already has the maximum number of players allowed
+            CANNOT_ENTER_ZONE_IN_COMBAT, // A boss encounter is currently in progress on the target map
+            CANNOT_ENTER_UNSPECIFIED_REASON
+        };
+        virtual EnterState CannotEnter(Player* /*player*/) { return CAN_ENTER; }
         const char* GetMapName() const;
 
         // have meaning only for instanced map (that have set real difficulty)
@@ -751,7 +767,7 @@ class InstanceMap : public Map
         InstanceScript* GetInstanceScript() { return i_data; }
         void PermBindAllPlayers(Player* source);
         void UnloadAll() override;
-        bool CanEnter(Player* player) override;
+        EnterState CannotEnter(Player* player) override;
         void SendResetWarnings(uint32 timeLeft) const;
         void SetResetSchedule(bool on);
 
@@ -774,7 +790,7 @@ class BattlegroundMap : public Map
 
         bool AddPlayerToMap(Player* player, bool initPlayer = true) override;
         void RemovePlayerFromMap(Player*, bool) override;
-        bool CanEnter(Player* player) override;
+        EnterState CannotEnter(Player* player) override;
         void SetUnload();
         //void UnloadAll(bool pForce);
         void RemoveAllPlayers() override;