Moving attacks to Domain-Driven Design and Entity-Component architecture

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/entities/enemies/enemy.dart

@@ -14,18 +14,21 @@ abstract class Enemy extends Entity {
     super.lastActionTime,
   });
 
-  int health = 25; // Standard guard health
+  // Standard guard health
+  int health = 25;
   bool isDying = false;
 
   void takeDamage(int amount, int currentTime) {
     if (state == EntityState.dead) return;
 
     health -= amount;
-    lastActionTime = currentTime; // CRITICAL: Mark the start of the death/pain
+    // Mark the start of the death/pain
+    lastActionTime = currentTime;
 
     if (health <= 0) {
       state = EntityState.dead;
-      isDying = true; // This triggers the animation in BrownGuard
+      // This triggers the dying animation
+      isDying = true;
     } else if (math.Random().nextDouble() < 0.5) {
       state = EntityState.pain;
     } else {
@@ -36,7 +39,8 @@ abstract class Enemy extends Entity {
   // Decodes the Map ID to figure out which way the enemy is facing
   static double getInitialAngle(int objId) {
     int normalizedId = (objId - 108) % 36;
-    int direction = normalizedId % 4; // 0=East, 1=North, 2=West, 3=South
+    // 0=East, 1=North, 2=West, 3=South
+    int direction = normalizedId % 4;
 
     switch (direction) {
       case 0:
@@ -88,7 +92,24 @@ abstract class Enemy extends Entity {
     return true;
   }
 
-  // Update signature is cleaner now
+  // The weapon asks the enemy if it is unobstructed from the shooter
+  bool hasLineOfSightFrom(
+    LinearCoordinates source,
+    double sourceAngle,
+    double distance,
+    bool Function(int x, int y) isWalkable,
+  ) {
+    double dirX = math.cos(sourceAngle);
+    double dirY = math.sin(sourceAngle);
+
+    for (double i = 0.5; i < distance; i += 0.2) {
+      int checkX = (source.x + dirX * i).toInt();
+      int checkY = (source.y + dirY * i).toInt();
+      if (!isWalkable(checkX, checkY)) return false;
+    }
+    return true;
+  }
+
   void update({
     required int elapsedMs,
     required LinearCoordinates player,