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