Implements experience gain

Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs

@@ -49,6 +49,7 @@ public class Gen7Plugin : Plugin<Gen7PluginConfiguration>, IResourceProvider
         registry.RegisterDamageCalculator(new Gen7DamageCalculator(Configuration));
         registry.RegisterMiscLibrary(new Gen7MiscLibrary());
         registry.RegisterCaptureLibrary(new Gen7CaptureLibrary(Configuration));
+        registry.RegisterExperienceGainCalculator(new Gen7ExperienceGainCalculator());
 
         ExplicitAIFunctionRegistration.RegisterAIFunctions(registry.ExplicitAIHandlers);
     }

Plugins/PkmnLib.Plugin.Gen7/Libraries/Battling/Gen7ExperienceGainCalculator.cs

@@ -0,0 +1,40 @@
+using System.Diagnostics.CodeAnalysis;
+using PkmnLib.Dynamic.Libraries;
+
+namespace PkmnLib.Plugin.Gen7.Libraries.Battling;
+
+/// <inheritdoc />
+public class Gen7ExperienceGainCalculator : IExperienceGainCalculator
+{
+    /// <inheritdoc />
+    [SuppressMessage("ReSharper", "UselessBinaryOperation")]
+    public uint CalculateExperienceGain(IPokemon defeatedPokemon, IPokemon victoriousPokemon)
+    {
+        var b = defeatedPokemon.Form.BaseExperience;
+        var levelFainted = defeatedPokemon.Level;
+        var levelOpponent = victoriousPokemon.Level;
+        // TODO: Experience share, in which case s = 2 for Pokemon that did not participate in battle
+        var s = 1;
+
+        var v1 = b * levelFainted / 5 * (1 / s);
+        var v2 = (2 * levelFainted + 10) / (levelFainted + levelOpponent + 10);
+        var res = v1 * Math.Pow(v2, 2.5) + 1;
+
+        // TODO: t = 1.5 if the Pokemon is traded, and 1.7 is traded and has a different language
+        var t = 1;
+        res *= t;
+        // TODO: script modifier, which is e.
+        var e = 1;
+        res *= e;
+        // TODO: v = 1.2 if the Pokemon is at or past the level where it evolves
+        var v = 1;
+        res *= v;
+
+        return res switch
+        {
+            > uint.MaxValue => uint.MaxValue,
+            < 0 => 0,
+            _ => (uint)res,
+        };
+    }
+}