Add in throwable items (dagger) from pixel dungeon

src/engine/gameplay/__tests__/CombatLogic.test.ts

@@ -0,0 +1,125 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { traceProjectile } from '../CombatLogic';
+import type { World } from '../../../core/types';
+import { EntityManager } from '../../EntityManager';
+import { TileType } from '../../../core/terrain';
+
+describe('CombatLogic', () => {
+    // Mock World
+    const mockWorld: World = {
+        width: 10,
+        height: 10,
+        tiles: new Array(100).fill(TileType.EMPTY),
+        actors: new Map(),
+        exit: { x: 9, y: 9 }
+    };
+
+    // Helper to set wall
+    const setWall = (x: number, y: number) => {
+        mockWorld.tiles[y * mockWorld.width + x] = TileType.WALL;
+    };
+    
+    // Helper to clear world
+    const clearWorld = () => {
+        mockWorld.tiles.fill(TileType.EMPTY);
+        mockWorld.actors.clear();
+    };
+
+    // Mock EntityManager
+    const mockEntityManager = {
+        getActorsAt: (x: number, y: number) => {
+            return [...mockWorld.actors.values()].filter(a => a.pos.x === x && a.pos.y === y);
+        }
+    } as unknown as EntityManager;
+
+    beforeEach(() => {
+        clearWorld();
+    });
+
+    describe('traceProjectile', () => {
+        it('should travel full path if no obstacles', () => {
+            const start = { x: 0, y: 0 };
+            const end = { x: 5, y: 0 };
+            
+            const result = traceProjectile(mockWorld, start, end, mockEntityManager);
+            
+            expect(result.blockedPos).toEqual(end);
+            expect(result.hitActorId).toBeUndefined();
+            // Path should be (0,0) -> (1,0) -> (2,0) -> (3,0) -> (4,0) -> (5,0)
+            // But raycast implementation includes start? 
+            // CombatLogic logic: "skip start" -> loop i=1
+            // So result.path is full array from raycast.
+            expect(result.path).toHaveLength(6); 
+        });
+
+        it('should stop at wall', () => {
+            const start = { x: 0, y: 0 };
+            const end = { x: 5, y: 0 };
+            setWall(3, 0); // Wall at (3,0)
+
+            const result = traceProjectile(mockWorld, start, end, mockEntityManager);
+            
+            expect(result.blockedPos).toEqual({ x: 3, y: 0 });
+            expect(result.hitActorId).toBeUndefined();
+        });
+
+        it('should stop at enemy', () => {
+            const start = { x: 0, y: 0 };
+            const end = { x: 5, y: 0 };
+            
+            // Place enemy at (3,0)
+            const enemyId = 2;
+            mockWorld.actors.set(enemyId, {
+                id: enemyId,
+                type: 'rat',
+                category: 'combatant',
+                pos: { x: 3, y: 0 },
+                isPlayer: false
+                // ... other props mocked if needed
+            } as any);
+
+            const result = traceProjectile(mockWorld, start, end, mockEntityManager, 1); // Shooter 1
+            
+            expect(result.blockedPos).toEqual({ x: 3, y: 0 });
+            expect(result.hitActorId).toBe(enemyId);
+        });
+
+        it('should ignore shooter position', () => {
+             const start = { x: 0, y: 0 };
+             const end = { x: 5, y: 0 };
+             
+             // Shooter at start
+             mockWorld.actors.set(1, {
+                 id: 1,
+                 type: 'player',
+                 category: 'combatant',
+                 pos: { x: 0, y: 0 },
+                 isPlayer: true
+             } as any);
+
+             const result = traceProjectile(mockWorld, start, end, mockEntityManager, 1);
+             
+             // Should not hit self
+             expect(result.hitActorId).toBeUndefined();
+             expect(result.blockedPos).toEqual(end);
+        });
+
+        it('should ignore non-combatant actors (e.g. items)', () => {
+            const start = { x: 0, y: 0 };
+            const end = { x: 5, y: 0 };
+            
+            // Item at (3,0)
+            mockWorld.actors.set(99, {
+                id: 99,
+                category: 'item_drop',
+                pos: { x: 3, y: 0 },
+            } as any);
+
+            const result = traceProjectile(mockWorld, start, end, mockEntityManager);
+            
+            // Should pass through item
+            expect(result.blockedPos).toEqual(end);
+            expect(result.hitActorId).toBeUndefined();
+       });
+    });
+});