Support adding experience

PkmnLib.Dynamic/Models/Pokemon.cs

@@ -50,6 +50,11 @@ public interface IPokemon : IScriptSource
     /// The amount of experience of the Pokemon.
     /// </summary>
     uint Experience { get; }
+    
+    /// <summary>
+    /// Increases the experience of the Pokemon. Returns whether any experience was gained.
+    /// </summary>
+    bool AddExperience(uint experience);
 
     /// <summary>
     /// The personality value of the Pokemon.
@@ -469,7 +474,34 @@ public class PokemonImpl : ScriptSource, IPokemon
     public LevelInt Level { get; private set; }
 
     /// <inheritdoc />
-    public uint Experience { get; }
+    public uint Experience { get; private set; }
+
+    /// <inheritdoc />
+    public bool AddExperience(uint experience)
+    {
+        if (!AllowedExperience)
+            return false;
+        var maxLevel = Library.StaticLibrary.Settings.MaxLevel;
+        if (Level >= maxLevel)
+            return false;
+        var oldLevel = Level;
+        var oldExperience = Experience;
+        Experience += experience;
+        var newLevel = Library.StaticLibrary.GrowthRates.CalculateLevel(Species.GrowthRate, Experience);
+        if (newLevel > Level)
+        {
+            Level = newLevel;
+            RecalculateFlatStats();
+            BattleData?.Battle.EventHook.Invoke(new LevelUpEvent(this, oldLevel, Level));
+            
+            if (newLevel >= maxLevel)
+            {
+                Experience = Library.StaticLibrary.GrowthRates.CalculateExperience(Species.GrowthRate, maxLevel);
+            }
+        }
+
+        return oldExperience != Experience;
+    }
 
     /// <inheritdoc />
     public uint PersonalityValue { get; }