Adding major combat changes and features

Assets/_Project/Scripts/Core/Enums.cs

@@ -1,5 +1,48 @@
 namespace TD.Core
 {
+    /// <summary>
+    /// How a tower's attack damage is typed. Determines which lingering effect is applied
+    /// on hit and how enemy resistances/weaknesses are calculated (Phase 1.5+).
+    /// </summary>
+    public enum DamageType : byte
+    {
+        Physical = 0,
+        Piercing  = 1,
+        Cold      = 2,
+        Fire      = 3,
+        Poison    = 4,
+        Holy      = 5,
+    }
+
+    /// <summary>
+    /// How a tower selects which enemy in range to attack.
+    /// </summary>
+    public enum TargetPriority : byte
+    {
+        /// <summary>Nearest enemy to the tower's center.</summary>
+        Closest   = 0,
+        /// <summary>Enemy with the lowest current HP.</summary>
+        Weakest   = 1,
+        /// <summary>Enemy with the highest current HP.</summary>
+        Strongest = 2,
+    }
+
+    /// <summary>
+    /// How a tower's damage is distributed across enemies.
+    /// Orthogonal to <see cref="TowerDefinition.ProjectilePrefab"/>: any target type
+    /// can be delivered by a projectile or hitscan.
+    /// </summary>
+    public enum TargetType : byte
+    {
+        /// <summary>Hits one enemy for full damage.</summary>
+        Single = 0,
+        /// <summary>Hits the primary target, then all enemies within SplashRadius.</summary>
+        Splash = 1,
+        /// <summary>Chains damage to up to ChainCount additional nearby enemies.</summary>
+        Chain  = 2,
+    }
+
+
     /// <summary>
     /// Identifies a player slot in a match. Backed by byte to keep grid arrays compact.
     /// </summary>