Core/Map: Implement several difficulty getters

Port From (https://github.com/TrinityCore/TrinityCore/commit/9eceff2bc243946998c006418229dbb639e898d6)

Source/Framework/Constants/SharedConst.cs

@@ -933,11 +933,11 @@ namespace Framework.Constants
 
     public enum DifficultyFlags : ushort
     {
-        Heroic = 0x01,
+        HeroicStyleLockouts = 0x01,
         Default = 0x02,
         CanSelect = 0x04, // Player can select this difficulty in dropdown menu
-        ChallengeMode = 0x08,
-
+        //ChallengeMode = 0x08, // deprecated since Legion expansion
+        LfgOnly = 0x10,
         Legacy = 0x20,
         DisplayHeroic = 0x40, // Controls icon displayed on minimap when inside the instance
         DisplayMythic = 0x80  // Controls icon displayed on minimap when inside the instance

Source/Game/AI/ScriptedAI/ScriptedAI.cs

@@ -16,12 +16,10 @@ namespace Game.AI
     {
         Difficulty _difficulty;
         bool _isCombatMovementAllowed;
-        bool _isHeroic;
 
         public ScriptedAI(Creature creature) : base(creature)
         {
             _isCombatMovementAllowed = true;
-            _isHeroic = me.GetMap().IsHeroic();
             _difficulty = me.GetMap().GetDifficultyID();
         }
 
@@ -456,16 +454,45 @@ namespace Game.AI
         }
 
         public bool HealthBelowPct(int pct) { return me.HealthBelowPct(pct); }
+
         public bool HealthAbovePct(int pct) { return me.HealthAbovePct(pct); }
 
-        public bool IsCombatMovementAllowed() { return _isCombatMovementAllowed; }
+        public bool IsLFR()
+        {
+            return me.GetMap().IsLFR();
+        }
 
-        // return true for heroic mode. i.e.
-        //   - for dungeon in mode 10-heroic,
-        //   - for raid in mode 10-Heroic
-        //   - for raid in mode 25-heroic
-        // DO NOT USE to check raid in mode 25-normal.
-        public bool IsHeroic() { return _isHeroic; }
+        public bool IsNormal()
+        {
+            return me.GetMap().IsNormal();
+        }
+
+        public bool IsHeroic()
+        {
+            return me.GetMap().IsHeroic();
+        }
+
+        public bool IsMythic()
+        {
+            return me.GetMap().IsMythic();
+        }
+
+        public bool IsMythicPlus()
+        {
+            return me.GetMap().IsMythicPlus();
+        }
+
+        public bool IsHeroicOrHigher()
+        {
+            return me.GetMap().IsHeroicOrHigher();
+        }
+
+        public bool IsTimewalking()
+        {
+            return me.GetMap().IsTimewalking();
+        }
+
+        public bool IsCombatMovementAllowed() { return _isCombatMovementAllowed; }
 
         // return the dungeon or raid difficulty
         public Difficulty GetDifficulty() { return _difficulty; }

Source/Game/Maps/Map.cs

@@ -3264,20 +3264,62 @@ namespace Game.Maps
             return i_mapRecord != null && i_mapRecord.IsRaid();
         }
 
+        public bool IsLFR() => i_spawnMode switch
+        {
+            Difficulty.LFR or Difficulty.LFRNew or Difficulty.LFR15thAnniversary => true,
+            _ => false
+        };
+
+        public bool IsNormal() => i_spawnMode switch
+        {
+            Difficulty.Normal or Difficulty.Raid10N or Difficulty.Raid25N or Difficulty.NormalRaid or Difficulty.NormalIsland or Difficulty.NormalWarfront => true,
+            _ => false
+        };
+
         public bool IsHeroic()
         {
             DifficultyRecord difficulty = CliDB.DifficultyStorage.LookupByKey(i_spawnMode);
+            if (difficulty != null && difficulty.Flags.HasFlag(DifficultyFlags.DisplayHeroic))
+                return true;
+
+            // compatibility purposes of old difficulties
+            return i_spawnMode switch
+            {
+                Difficulty.Raid10HC or Difficulty.Raid25HC or Difficulty.Heroic or Difficulty.Scenario3ManHC => true,
+                _ => false
+            };
+        }
+
+        public bool IsMythic()
+        {
+            var difficulty = CliDB.DifficultyStorage.LookupByKey(i_spawnMode);
             if (difficulty != null)
-                return difficulty.Flags.HasAnyFlag(DifficultyFlags.Heroic);
+                return difficulty.Flags.HasFlag(DifficultyFlags.DisplayMythic);
+
             return false;
         }
 
+        public bool IsMythicPlus()
+        {
+            return IsDungeon() && i_spawnMode == Difficulty.MythicKeystone;
+        }
+
+        public bool IsHeroicOrHigher()
+        {
+            return IsHeroic() || IsMythic() || IsMythicPlus();
+        }
+
         public bool Is25ManRaid()
         {
             // since 25man difficulties are 1 and 3, we can check them like that
             return IsRaid() && (i_spawnMode == Difficulty.Raid25N || i_spawnMode == Difficulty.Raid25HC);
         }
 
+        public bool IsTimewalking()
+        {
+            return (IsDungeon() && i_spawnMode == Difficulty.Timewalking) || (IsRaid() && i_spawnMode == Difficulty.TimewalkingRaid);
+        }
+
         public bool IsBattleground()
         {
             return i_mapRecord != null && i_mapRecord.IsBattleground();