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* HitFeedbackEffect3D - Visual hit confirmation with damage numbers
*
* Provides particle effects, color flashes, and floating damage numbers
* for training hit feedback
*/
import { Html } from "@react-three/drei";
import { useFrame } from "@react-three/fiber";
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import * as THREE from "three";
import { KOREAN_COLORS, FONT_FAMILY } from "../../../types/constants";
/**
* Props for HitFeedbackEffect3D component
*/
export interface HitFeedbackEffect3DProps {
/** 3D position where hit occurred */
readonly position: [number, number, number];
/** Type of hit (affects visual style) */
readonly type: "success" | "perfect" | "miss";
/** Damage dealt (if applicable) */
readonly damage?: number;
/** Whether effect is visible */
readonly visible?: boolean;
/** Callback when effect completes */
readonly onComplete?: () => void;
/** Duration in milliseconds */
readonly duration?: number;
/** Whether on mobile device */
readonly isMobile?: boolean;
}
/**
* Impact particle system
*/
const ImpactParticles: React.FC<{
position: [number, number, number];
color: number;
count: number;
}> = ({ position, color, count }) => {
const pointsRef = useRef<THREE.Points>(null);
// Store velocities in a ref that persists across renders
const velocitiesRef = useRef<Float32Array | null>(null);
// Store initial position for seeded random - use useState to capture at mount
// Note: This intentionally ignores position prop changes to maintain consistent
// particle behavior throughout the effect's lifetime. To update particles when
// position changes, add a key prop to the parent component to force remount.
const [initialPosition] = useState(position);
// Initialize particle positions and velocities - use seed based on initial position
const { positions, velocities } = useMemo(() => {
const pos = new Float32Array(count * 3);
const vel = new Float32Array(count * 3);
// Use initial position as seed for deterministic but varying particles
const seed = initialPosition[0] + initialPosition[1] * 10 + initialPosition[2] * 100;
// Simple seeded random using position
// Large multiplier (10000) ensures sufficient entropy for randomness while keeping values deterministic
function seededRandom(index: number): number {
const x = Math.sin(seed + index) * 10000;
return x - Math.floor(x);
}
for (let i = 0; i < count; i++) {
const i3 = i * 3;
// Start at center
pos[i3] = 0;
pos[i3 + 1] = 0;
pos[i3 + 2] = 0;
// Random outward velocities using seeded random
const theta = seededRandom(i * 3) * Math.PI * 2;
const phi = seededRandom(i * 3 + 1) * Math.PI;
const speed = 0.5 + seededRandom(i * 3 + 2) * 1.5;
vel[i3] = Math.sin(phi) * Math.cos(theta) * speed;
vel[i3 + 1] = Math.cos(phi) * speed + 1; // Upward bias
vel[i3 + 2] = Math.sin(phi) * Math.sin(theta) * speed;
}
return { positions: pos, velocities: vel };
}, [count, initialPosition]); // initialPosition is captured at mount and won't change
// Update velocities ref in useEffect to avoid ref access during render
useEffect(() => {
velocitiesRef.current = velocities;
}, [velocities]);
// Animate particles
useFrame((_, delta) => {
if (!pointsRef.current || !velocitiesRef.current) return;
const attr = pointsRef.current.geometry.attributes.position;
const array = attr.array as Float32Array;
const vel = velocitiesRef.current;
for (let i = 0; i < count; i++) {
const i3 = i * 3;
// Update positions
array[i3] += vel[i3] * delta * 10;
array[i3 + 1] += vel[i3 + 1] * delta * 10;
array[i3 + 2] += vel[i3 + 2] * delta * 10;
// Apply gravity
// Note: Intentionally mutating velocitiesRef.current (Float32Array) for performance.
// This is safe and won't trigger React re-renders since it's a ref.
vel[i3 + 1] -= 9.8 * delta;
// Fade out particles that go too far
if (array[i3 + 1] < -2) {
array[i3 + 1] = -2;
}
}
attr.needsUpdate = true;
});
return (
<points ref={pointsRef} position={position}>
<bufferGeometry>
<bufferAttribute
attach="attributes-position"
args={[positions, 3]}
/>
</bufferGeometry>
<pointsMaterial
size={0.05}
color={color}
transparent
opacity={0.8}
sizeAttenuation
depthWrite={false}
/>
</points>
);
};
/**
* Expanding ring effect
*/
const RingEffect: React.FC<{
position: [number, number, number];
color: number;
maxRadius: number;
}> = ({ position, color, maxRadius }) => {
const meshRef = useRef<THREE.Mesh>(null);
const startTime = useRef<number>(0);
// Initialize start time on mount using useEffect
useEffect(() => {
if (startTime.current === 0) {
startTime.current = Date.now();
}
}, []);
useFrame(() => {
if (!meshRef.current) return;
const elapsed = (Date.now() - startTime.current) / 1000;
const progress = Math.min(elapsed / 0.5, 1); // 0.5 second duration
// Expand ring
const radius = progress * maxRadius;
meshRef.current.scale.setScalar(radius);
// Fade out
const material = meshRef.current.material as THREE.MeshBasicMaterial;
material.opacity = 1 - progress;
});
return (
<mesh ref={meshRef} position={position} rotation={[Math.PI / 2, 0, 0]}>
<ringGeometry args={[0.9, 1.0, 32]} />
<meshBasicMaterial
color={color}
transparent
opacity={1}
side={THREE.DoubleSide}
/>
</mesh>
);
};
/**
* Floating damage number
*/
const DamageNumber: React.FC<{
position: [number, number, number];
damage: number;
type: "perfect" | "normal" | "miss";
isMobile: boolean;
onComplete: () => void;
}> = ({ position, damage, type, isMobile, onComplete }) => {
const [offset, setOffset] = useState(0);
const [opacity, setOpacity] = useState(1);
const startTime = useRef<number>(0);
const completedRef = useRef(false);
// Initialize start time on mount using useEffect
useEffect(() => {
if (startTime.current === 0) {
startTime.current = Date.now();
}
}, []);
useFrame(() => {
const elapsed = (Date.now() - startTime.current) / 1000;
const progress = Math.min(elapsed / 1.5, 1); // 1.5 second duration
// Float upward
setOffset(progress * 1);
// Fade out
setOpacity(1 - progress);
// Complete when done (only once)
if (progress >= 1 && !completedRef.current && onComplete) {
completedRef.current = true;
onComplete();
}
});
const color = type === "perfect" ? "#ffd700" : type === "normal" ? "#00ffff" : "#ff4444";
const text = type === "miss" ? "빗나감 | MISS" : `${damage}`; // Korean: 빗나감 = miss/deflected
return (
<Html
position={[position[0], position[1] + offset, position[2]]}
center
distanceFactor={10}
style={{ pointerEvents: "none", opacity }}
>
<div
style={{
fontSize: isMobile ? "20px" : "28px",
fontWeight: "bold",
fontFamily: FONT_FAMILY.KOREAN,
color,
textShadow: "0 0 10px rgba(0, 0, 0, 0.8)",
whiteSpace: "nowrap",
}}
data-testid="damage-number"
>
{text}
</div>
</Html>
);
};
/**
* HitFeedbackEffect3D Component
* Main hit feedback visualization
*/
export const HitFeedbackEffect3D: React.FC<HitFeedbackEffect3DProps> = ({
position,
type,
damage,
visible = true,
onComplete,
duration = 1500,
isMobile = false,
}) => {
const [showEffect, setShowEffect] = useState(visible);
const timeoutRef = useRef<NodeJS.Timeout | null>(null);
// Get colors based on hit type
const effectColor = useMemo(() => {
switch (type) {
case "perfect":
return KOREAN_COLORS.ACCENT_GOLD;
case "success":
return KOREAN_COLORS.PRIMARY_CYAN;
case "miss":
return KOREAN_COLORS.TEXT_SECONDARY;
default:
return KOREAN_COLORS.PRIMARY_CYAN;
}
}, [type]);
const particleCount = type === "perfect" ? 30 : type === "success" ? 20 : 10;
const ringRadius = type === "perfect" ? 1.5 : 1.0;
// Track completion to prevent multiple calls
const completedRef = useRef(false);
// Handle effect completion (only once)
const handleComplete = useCallback(() => {
if (completedRef.current) return;
completedRef.current = true;
setShowEffect(false);
onComplete?.();
}, [onComplete]);
// Auto-complete after duration
useEffect(() => {
if (visible && showEffect) {
timeoutRef.current = setTimeout(handleComplete, duration);
}
return () => {
if (timeoutRef.current) {
clearTimeout(timeoutRef.current);
}
};
}, [visible, showEffect, duration, handleComplete]);
if (!showEffect) return null;
return (
<group data-testid={`hit-feedback-${type}`}>
{/* Particle burst */}
<ImpactParticles
position={position}
color={effectColor}
count={particleCount}
/>
{/* Expanding ring */}
<RingEffect
position={position}
color={effectColor}
maxRadius={ringRadius}
/>
{/* Floating damage number */}
{damage !== undefined && type !== "miss" && (
<DamageNumber
position={position}
damage={damage}
type={type === "perfect" ? "perfect" : "normal"}
isMobile={isMobile}
onComplete={handleComplete}
/>
)}
{/* Miss indicator */}
{type === "miss" && (
<DamageNumber
position={position}
damage={0}
type="miss"
isMobile={isMobile}
onComplete={handleComplete}
/>
)}
</group>
);
};
export default HitFeedbackEffect3D;
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