Implements sandstorm

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

@@ -15,7 +15,11 @@ public class Overcoat : Script
         {
             hailArgs.Ignore = true;
         }
-        // TODO: Ignore sandstorm damage
+        else if (eventName == CustomTriggers.BypassSandstormDamage &&
+                 args is CustomTriggers.BypassSandstormDamageArgs bypassArgs)
+        {
+            bypassArgs.Bypass = true;
+        }
     }
 
     /// <inheritdoc />

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

@@ -22,5 +22,13 @@ public class SandForce : Script
         }
     }
 
-    // TODO: Prevent sandstorm damage.
+    /// <inheritdoc />
+    public override void CustomTrigger(StringKey eventName, ICustomTriggerArgs args)
+    {
+        if (eventName == CustomTriggers.BypassSandstormDamage &&
+            args is CustomTriggers.BypassSandstormDamageArgs bypassArgs)
+        {
+            bypassArgs.Bypass = true;
+        }
+    }
 }

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

@@ -17,5 +17,13 @@ public class SandRush : Script
         }
     }
 
-    // TODO: Prevent sandstorm damage.
+    /// <inheritdoc />
+    public override void CustomTrigger(StringKey eventName, ICustomTriggerArgs args)
+    {
+        if (eventName == CustomTriggers.BypassSandstormDamage &&
+            args is CustomTriggers.BypassSandstormDamageArgs bypassArgs)
+        {
+            bypassArgs.Bypass = true;
+        }
+    }
 }

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

@@ -18,5 +18,13 @@ public class SandVeil : Script
         modifiedAccuracy = (int)(modifiedAccuracy * (3277f / 4096f));
     }
 
-    // TODO: Prevent sandstorm damage.
+    /// <inheritdoc />
+    public override void CustomTrigger(StringKey eventName, ICustomTriggerArgs args)
+    {
+        if (eventName == CustomTriggers.BypassSandstormDamage &&
+            args is CustomTriggers.BypassSandstormDamageArgs bypassArgs)
+        {
+            bypassArgs.Bypass = true;
+        }
+    }
 }

Plugins/PkmnLib.Plugin.Gen7/Scripts/CustomTriggers.cs

@@ -139,4 +139,11 @@ public static class CustomTriggers
     {
         public bool Prevent { get; set; } = false;
     }
+
+    public static readonly StringKey BypassSandstormDamage = "bypass_sandstorm_damage";
+
+    public record BypassSandstormDamageArgs(IPokemon Pokemon) : ICustomTriggerArgs
+    {
+        public bool Bypass { get; set; } = false;
+    }
 }

Plugins/PkmnLib.Plugin.Gen7/Scripts/Weather/Sandstorm.cs

@@ -3,5 +3,39 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Weather;
 [Script(ScriptCategory.Weather, "sandstorm")]
 public class Sandstorm : Script
 {
-    // TODO: Implement Sandstorm
+    /// <inheritdoc />
+    public override void OnEndTurn(IScriptSource owner, IBattle battle)
+    {
+        foreach (var pokemon in battle.Sides.SelectMany(x => x.Pokemon).WhereNotNull())
+        {
+            if (!pokemon.IsUsable)
+                continue;
+            if (pokemon.Types.Any(x => x.Name == "rock" || x.Name == "ground" || x.Name == "steel"))
+            {
+                // Rock, Ground, and Steel types are immune to Sandstorm damage.
+                continue;
+            }
+            var bypassSandstormArgs = new CustomTriggers.BypassSandstormDamageArgs(pokemon);
+            pokemon.RunScriptHook(x => x.CustomTrigger(CustomTriggers.BypassSandstormDamage, bypassSandstormArgs));
+            if (bypassSandstormArgs.Bypass)
+                continue;
+
+            pokemon.Damage(pokemon.MaxHealth / 16, DamageSource.Weather);
+        }
+    }
+
+    /// <inheritdoc />
+    public override void ChangeDefensiveStatValue(IExecutingMove move, IPokemon target, byte hit, uint offensiveStat,
+        ImmutableStatisticSet<uint> targetStats, Statistic stat, ref uint value)
+    {
+        if (stat == Statistic.SpecialDefense && target.Types.Any(x => x.Name == "rock"))
+            value = value.MultiplyOrMax(1.5f);
+    }
+
+    /// <inheritdoc />
+    public override void ChangeBasePower(IExecutingMove move, IPokemon target, byte hit, ref ushort basePower)
+    {
+        if (move.UseMove.Name == "solar_beam")
+            basePower /= 2;
+    }
 }