first commmit

assets/scripts/logic/DamageSystem.ts

@@ -0,0 +1,51 @@
+import { AttackType } from '../data/Interfaces';
+import { PlayerStateMachine, DamageOutcome } from './PlayerStateMachine';
+
+/**
+ * DamageSystem — the single funnel through which **every** player-facing
+ * damage event must flow (req 10.1-10.6).
+ *
+ * Decision precedence (req 10.3):
+ *   1. i-frames  → no effect
+ *   2. sword parry → no effect (only vs. shuriken/sword; see PSM)
+ *   3. attack type × distance → dispatch to PlayerStateMachine.takeHit
+ *
+ * Distance thresholds:
+ *   - fireball: lethal within 100px (req 10.4)
+ *   - smoke bomb: lethal within 80px (req 10.5)
+ *   - shuriken / sword: any contact is eligible
+ *
+ * Enemy-facing damage is a separate, simpler `applyToEnemy` helper.
+ */
+
+export interface IDamageContext {
+    attackType: AttackType;
+    attackerX: number;
+    attackerY: number;
+    victimX: number;
+    victimY: number;
+}
+
+export const FIREBALL_KILL_RADIUS = 100;
+export const SMOKE_KILL_RADIUS = 80;
+
+export class DamageSystem {
+    constructor(private readonly psm: PlayerStateMachine) {}
+
+    /** Try to damage the player. Returns `null` if the attack missed by distance. */
+    public applyToPlayer(ctx: IDamageContext): DamageOutcome | null {
+        const distance = Math.hypot(ctx.attackerX - ctx.victimX, ctx.attackerY - ctx.victimY);
+        if (ctx.attackType === 'fireball' && distance > FIREBALL_KILL_RADIUS) return null;
+        if (ctx.attackType === 'smoke_bomb' && distance > SMOKE_KILL_RADIUS) return null;
+        // shuriken / sword rely on caller-side hitbox; reaching here means "hit".
+        return this.psm.takeHit(ctx.attackType);
+    }
+
+    /**
+     * Apply flat damage to an enemy HP bucket. The damage number comes from
+     * the active weapon config. Returns the remaining HP (0 means killed).
+     */
+    public applyToEnemy(currentHp: number, damage: number): number {
+        return Math.max(0, currentHp - damage);
+    }
+}