More abilities, implemented support for form inheritance

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/Moody.cs

@@ -0,0 +1,55 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Moody is an ability that raises one stat and lowers another at the end of each turn.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Moody_(Ability)">Bulbapedia - Moody</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "moody")]
+public class Moody : Script
+{
+    private IPokemon? _pokemon;
+
+    /// <inheritdoc />
+    public override void OnAddedToParent(IScriptSource source)
+    {
+        if (source is not IPokemon pokemon)
+            throw new InvalidOperationException("Moody script must be attached to a Pokemon.");
+        _pokemon = pokemon;
+    }
+
+    /// <inheritdoc />
+    public override void OnEndTurn(IBattle battle)
+    {
+        if (_pokemon == null)
+            return;
+
+        var stats = _pokemon.StatBoost;
+        Statistic? raiseStat = null;
+
+        var possibleStatsToRaise = stats.Where(x => x is
+                { value: < 6, statistic: not Statistic.Accuracy and not Statistic.Evasion and not Statistic.Hp })
+            .Select(x => x.statistic).ToList();
+        if (possibleStatsToRaise.Count > 0)
+        {
+            raiseStat = possibleStatsToRaise[battle.Random.GetInt(possibleStatsToRaise.Count)];
+        }
+
+        Statistic? lowerStat = null;
+        var possibleStatsToLower = stats.Where(x => x is
+        {
+            value: > -6,
+            statistic: not Statistic.Accuracy and not Statistic.Evasion and not Statistic.Hp,
+        } && x.statistic != raiseStat).Select(x => x.statistic).ToList();
+
+        if (possibleStatsToLower.Count > 0)
+        {
+            lowerStat = possibleStatsToLower[battle.Random.GetInt(possibleStatsToLower.Count)];
+        }
+
+        if (raiseStat != null)
+            _pokemon.ChangeStatBoost(raiseStat.Value, 1, true, false);
+        if (lowerStat != null)
+            _pokemon.ChangeStatBoost(lowerStat.Value, -1, true, false);
+    }
+}