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* Visual Effects Utilities for Korean Cyberpunk Aesthetic
*
* Provides advanced visual effects for HTML overlay components including:
* - Neon glow effects (box-shadow, text-shadow)
* - Depth effects (layered shadows, gradients, backdrop-blur)
* - Smooth transitions and animations
* - Korean font rendering optimization
* - Hover and focus state generators
*
* All effects follow Korean martial arts cyberpunk theme with 60fps performance target.
*
* @module utils/visualEffects
* @category UI Utilities
* @korean 시각효과유틸리티
*/
import { KOREAN_COLORS } from "../types/constants";
import { hexToRgbaString } from "./colorUtils";
/**
* Neon glow intensity levels
* @korean 네온글로우강도
*/
export type GlowIntensity = "subtle" | "medium" | "strong" | "intense";
/**
* Hover state animation types
* @korean 호버상태애니메이션
*/
export type HoverAnimationType = "glow" | "scale" | "lift" | "pulse" | "combined";
/**
* Transition timing presets
* @korean 전환타이밍프리셋
*/
export type TransitionTiming = "fast" | "normal" | "slow" | "smooth";
/**
* Depth effect layer configuration
* @korean 깊이효과레이어설정
*/
export interface DepthEffectConfig {
readonly layers: number;
readonly baseOffset: number;
readonly baseBlur: number;
readonly color: number;
readonly opacity: number;
}
/**
* Get neon glow effect CSS string
*
* Creates cyberpunk-style neon glow using box-shadow with Korean colors.
* Supports multiple intensity levels for different UI elements.
*
* @param color - Hex color value from KOREAN_COLORS
* @param intensity - Glow intensity level
* @param includeInset - Whether to include inset glow (default: true)
* @returns CSS box-shadow string with neon glow effect
*
* @example
* ```typescript
* const glow = getNeonGlowEffect(KOREAN_COLORS.PRIMARY_CYAN, 'medium', true);
* // Returns: "0 0 20px rgba(0,230,230,0.6), inset 0 0 10px rgba(0,230,230,0.3)"
* // Note: Color conversion is handled by hexToRgbaString utility
* ```
*
* @korean 네온글로우효과얻기
*/
export function getNeonGlowEffect(
color: number,
intensity: GlowIntensity = "medium",
includeInset: boolean = true
): string {
const glowConfig = {
subtle: { outer: 10, outerOpacity: 0.4, inner: 5, innerOpacity: 0.2 },
medium: { outer: 20, outerOpacity: 0.6, inner: 10, innerOpacity: 0.3 },
strong: { outer: 30, outerOpacity: 0.8, inner: 15, innerOpacity: 0.4 },
intense: { outer: 40, outerOpacity: 1.0, inner: 20, innerOpacity: 0.5 },
};
const config = glowConfig[intensity];
const outerGlow = `0 0 ${config.outer}px ${hexToRgbaString(color, config.outerOpacity)}`;
const insetGlow = includeInset
? `, inset 0 0 ${config.inner}px ${hexToRgbaString(color, config.innerOpacity)}`
: "";
return `${outerGlow}${insetGlow}`;
}
/**
* Get neon text shadow effect
*
* Creates glowing text effect for Korean and English text using text-shadow.
* Multiple shadow layers create authentic neon glow appearance.
*
* @param color - Hex color value from KOREAN_COLORS
* @param intensity - Glow intensity level
* @returns CSS text-shadow string with neon glow
*
* @example
* ```typescript
* const textGlow = getNeonTextShadow(KOREAN_COLORS.ACCENT_GOLD, 'strong');
* // Returns: "0 0 10px rgba(255,196,0,0.8), 0 0 20px rgba(255,196,0,0.6), 0 0 30px rgba(255,196,0,0.4)"
* ```
*
* @korean 네온텍스트그림자얻기
*/
export function getNeonTextShadow(
color: number,
intensity: GlowIntensity = "medium"
): string {
const shadowConfig = {
subtle: [
{ blur: 5, opacity: 0.6 },
{ blur: 10, opacity: 0.4 },
],
medium: [
{ blur: 10, opacity: 0.8 },
{ blur: 20, opacity: 0.6 },
{ blur: 30, opacity: 0.4 },
],
strong: [
{ blur: 15, opacity: 1.0 },
{ blur: 30, opacity: 0.8 },
{ blur: 45, opacity: 0.6 },
],
intense: [
{ blur: 20, opacity: 1.0 },
{ blur: 40, opacity: 0.9 },
{ blur: 60, opacity: 0.7 },
{ blur: 80, opacity: 0.5 },
],
};
const shadows = shadowConfig[intensity];
return shadows
.map(({ blur, opacity }) => `0 0 ${blur}px ${hexToRgbaString(color, opacity)}`)
.join(", ");
}
/**
* Get layered depth effect
*
* Creates depth using multiple shadow layers with increasing offset and blur.
* Provides 3D-like appearance for Korean-themed UI panels.
*
* @param config - Depth effect configuration
* @returns CSS box-shadow string with layered depth
*
* @example
* ```typescript
* const depth = getLayeredDepthEffect({
* layers: 3,
* baseOffset: 2,
* baseBlur: 4,
* color: KOREAN_COLORS.BLACK_SOLID,
* opacity: 0.5,
* });
* ```
*
* @korean 레이어깊이효과얻기
*/
export function getLayeredDepthEffect(config: DepthEffectConfig): string {
const { layers, baseOffset, baseBlur, color, opacity } = config;
const shadows: string[] = [];
for (let i = 1; i <= layers; i++) {
const offset = baseOffset * i;
const blur = baseBlur * i;
const layerOpacity = opacity * (1 - ((i - 1) / layers) * 0.3); // Fade each layer
shadows.push(
`0 ${offset}px ${blur}px ${hexToRgbaString(color, layerOpacity)}`
);
}
return shadows.join(", ");
}
/**
* Get cyberpunk gradient background
*
* Creates Korean-themed gradient with cyberpunk colors.
* Supports both linear and radial gradients.
*
* @param primaryColor - Primary hex color
* @param secondaryColor - Secondary hex color
* @param angle - Gradient angle in degrees (default: 135)
* @param type - Gradient type ('linear' | 'radial')
* @returns CSS gradient string
*
* @example
* ```typescript
* const gradient = getCyberpunkGradient(
* KOREAN_COLORS.PRIMARY_CYAN,
* KOREAN_COLORS.UI_BACKGROUND_DARK,
* 135,
* 'linear'
* );
* ```
*
* @korean 사이버펑크그라디언트얻기
*/
export function getCyberpunkGradient(
primaryColor: number,
secondaryColor: number,
angle: number = 135,
type: "linear" | "radial" = "linear"
): string {
const color1 = hexToRgbaString(primaryColor, 0.2);
const color2 = hexToRgbaString(secondaryColor, 0.9);
if (type === "radial") {
return `radial-gradient(circle at top left, ${color1} 0%, ${color2} 100%)`;
}
return `linear-gradient(${angle}deg, ${color1} 0%, ${color2} 100%)`;
}
/**
* Get smooth transition CSS
*
* Returns standardized transition string for consistent animations.
* All transitions target 60fps performance.
*
* @param properties - CSS properties to transition (default: 'all')
* @param timing - Timing preset
* @returns CSS transition string
*
* @example
* ```typescript
* const transition = getSmoothTransition('all', 'normal');
* // Returns: "all 0.2s ease-in-out"
* ```
*
* @korean 부드러운전환얻기
*/
export function getSmoothTransition(
properties: string = "all",
timing: TransitionTiming = "normal"
): string {
const timingConfig = {
fast: { duration: "0.15s", easing: "ease-out" },
normal: { duration: "0.2s", easing: "ease-in-out" },
slow: { duration: "0.3s", easing: "ease-in-out" },
smooth: { duration: "0.25s", easing: "cubic-bezier(0.4, 0, 0.2, 1)" },
};
const config = timingConfig[timing];
return `${properties} ${config.duration} ${config.easing}`;
}
/**
* Get Korean font optimization styles
*
* Applies optimal font rendering for Korean characters (Hangul).
* Includes anti-aliasing, subpixel rendering, and letter spacing.
*
* @param fontSize - Font size in pixels
* @param fontWeight - Font weight (default: 'normal')
* @returns React.CSSProperties with Korean font optimization
*
* @example
* ```typescript
* const fontStyle = getKoreanFontOptimization(16, 'bold');
* // Returns: { fontSize: '16px', WebkitFontSmoothing: 'antialiased', ... }
* ```
*
* @korean 한글폰트최적화얻기
*/
export function getKoreanFontOptimization(
fontSize: number,
fontWeight: "normal" | "bold" = "normal"
): React.CSSProperties & {
WebkitFontSmoothing?: string;
MozOsxFontSmoothing?: string;
} {
return {
fontSize: `${fontSize}px`,
fontWeight,
WebkitFontSmoothing: "antialiased",
MozOsxFontSmoothing: "grayscale",
textRendering: "optimizeLegibility",
letterSpacing: "0.02em",
// Korean characters need slightly more line height
lineHeight: 1.5,
};
}
/**
* Map numeric glow intensity to GlowIntensity type
*
* Helper to standardize glow intensity mapping across components.
* Converts numeric intensity values to discrete levels.
*
* @param glowIntensity - Numeric glow intensity (0-2+ scale)
* @returns GlowIntensity level ("subtle", "medium", "strong", "intense")
*
* Mapping thresholds:
* - intense: >= 1.5
* - strong: >= 1.0
* - medium: >= 0.6
* - subtle: < 0.6
*
* @example
* ```typescript
* const level = mapGlowIntensityLevel(0.8);
* // Returns: "medium"
* mapGlowIntensityLevel(2.0);
* // Returns: "intense"
* ```
*
* @korean 광도레벨매핑
*/
export function mapGlowIntensityLevel(glowIntensity: number): GlowIntensity {
if (glowIntensity >= 1.5) return "intense";
if (glowIntensity >= 1.0) return "strong";
if (glowIntensity >= 0.6) return "medium";
return "subtle";
}
/**
* Get hover state styles with glow effect
*
* Generates hover state styles with Korean cyberpunk animations.
* Includes glow intensification, scale, and lift effects.
*
* @param baseColor - Base hex color
* @param animation - Animation type
* @param intensity - Glow intensity for hover state
* @returns React.CSSProperties for hover state
*
* @example
* ```typescript
* const hoverStyle = getHoverStateStyles(
* KOREAN_COLORS.PRIMARY_CYAN,
* 'combined',
* 'strong'
* );
* ```
*
* @korean 호버상태스타일얻기
*/
export function getHoverStateStyles(
baseColor: number,
animation: HoverAnimationType = "combined",
intensity: GlowIntensity = "strong"
): React.CSSProperties {
const baseStyles: React.CSSProperties = {
transition: getSmoothTransition("all", "normal"),
cursor: "pointer",
};
const glowStyles: React.CSSProperties = {
boxShadow: getNeonGlowEffect(baseColor, intensity, true),
};
const scaleStyles: React.CSSProperties = {
transform: "scale(1.05)",
};
const liftStyles: React.CSSProperties = {
transform: "translateY(-2px)",
boxShadow: getLayeredDepthEffect({
layers: 3,
baseOffset: 4,
baseBlur: 8,
color: KOREAN_COLORS.BLACK_SOLID,
opacity: 0.6,
}),
};
const pulseStyles: React.CSSProperties = {
animation: "pulse 1.5s ease-in-out infinite",
};
switch (animation) {
case "glow":
return { ...baseStyles, ...glowStyles };
case "scale":
return { ...baseStyles, ...scaleStyles };
case "lift":
return { ...baseStyles, ...liftStyles };
case "pulse":
return { ...baseStyles, ...pulseStyles };
case "combined":
return {
...baseStyles,
...glowStyles,
transform: "scale(1.02) translateY(-1px)",
};
default:
return baseStyles;
}
}
/**
* Get focus state styles with accessibility
*
* Creates WCAG-compliant focus indicators with Korean cyberpunk styling.
* Ensures 2px border with high contrast (4.5:1 minimum).
*
* Note: While outline is set to "none", the custom 2px border provides
* equivalent accessibility. For users relying on high-contrast mode or
* custom browser settings, consider using outline-offset as an additional
* fallback or ensure the custom border has sufficient contrast (4.5:1+).
*
* @param color - Hex color for focus indicator
* @param includeGlow - Whether to include glow effect (default: true)
* @returns React.CSSProperties for focus state
*
* @example
* ```typescript
* const focusStyle = getFocusStateStyles(KOREAN_COLORS.ACCENT_GOLD, true);
* ```
*
* @korean 포커스상태스타일얻기
*/
export function getFocusStateStyles(
color: number,
includeGlow: boolean = true
): React.CSSProperties {
const baseStyles: React.CSSProperties = {
outline: "none",
border: `2px solid ${hexToRgbaString(color, 1.0)}`,
};
if (includeGlow) {
return {
...baseStyles,
boxShadow: getNeonGlowEffect(color, "medium", false),
};
}
return baseStyles;
}
/**
* Get backdrop blur effect
*
* Creates frosted glass effect for Korean-themed overlays.
* GPU-accelerated for 60fps performance.
*
* @param blurAmount - Blur amount in pixels (default: 10)
* @param saturation - Color saturation multiplier (default: 1.5)
* @returns React.CSSProperties with backdrop blur
*
* @example
* ```typescript
* const backdropStyle = getBackdropBlurEffect(12, 1.8);
* ```
*
* @korean 배경블러효과얻기
*/
export function getBackdropBlurEffect(
blurAmount: number = 10,
saturation: number = 1.5
): React.CSSProperties & {
WebkitBackdropFilter?: string;
} {
return {
backdropFilter: `blur(${blurAmount}px) saturate(${saturation})`,
WebkitBackdropFilter: `blur(${blurAmount}px) saturate(${saturation})`,
// Fallback for browsers without backdrop-filter support
backgroundColor: hexToRgbaString(KOREAN_COLORS.UI_BACKGROUND_DARK, 0.8),
};
}
/**
* Get trigram symbol glow effect
*
* Creates glowing effect for Eight Trigram symbols (☰☱☲☳☴☵☶☷).
* Uses stance-specific colors from KOREAN_COLORS.
*
* @param trigramColor - Trigram-specific hex color
* @param isActive - Whether trigram is currently active
* @returns React.CSSProperties with trigram glow
*
* @example
* ```typescript
* const trigramGlow = getTrigramSymbolGlow(
* KOREAN_COLORS.TRIGRAM_GEON_PRIMARY,
* true
* );
* ```
*
* @korean 팔괘상징글로우얻기
*/
export function getTrigramSymbolGlow(
trigramColor: number,
isActive: boolean
): React.CSSProperties {
const intensity = isActive ? "intense" : "subtle";
const scale = isActive ? 1.1 : 1.0;
return {
color: hexToRgbaString(trigramColor, 1.0),
textShadow: getNeonTextShadow(trigramColor, intensity),
transform: `scale(${scale})`,
transition: getSmoothTransition("all", "normal"),
filter: isActive ? "brightness(1.2)" : "brightness(1.0)",
};
}
/**
* Get GPU-accelerated animation hint
*
* Applies will-change CSS property to hint GPU acceleration.
* Use sparingly - only for actively animating elements.
*
* @param properties - Properties that will animate
* @returns React.CSSProperties with GPU hints
*
* @example
* ```typescript
* const gpuHint = getGPUAccelerationHint('transform, opacity');
* ```
*
* @korean GPU가속힌트얻기
*/
export function getGPUAccelerationHint(
properties: string = "transform"
): React.CSSProperties {
return {
willChange: properties,
transform: "translateZ(0)", // Force GPU layer
};
}
/**
* Combine multiple shadow effects
*
* Merges multiple box-shadow strings into a single CSS value.
* Useful for combining glow, depth, and custom shadows.
*
* @param shadows - Array of box-shadow strings
* @returns Combined box-shadow CSS string
*
* @example
* ```typescript
* const combined = combineShadowEffects([
* getNeonGlowEffect(KOREAN_COLORS.PRIMARY_CYAN, 'medium'),
* getLayeredDepthEffect({ layers: 2, baseOffset: 2, baseBlur: 4, color: 0x000000, opacity: 0.5 })
* ]);
* ```
*
* @korean 그림자효과결합
*/
export function combineShadowEffects(shadows: string[]): string {
return shadows.filter(Boolean).join(", ");
}
/**
* Get pulsing animation keyframes
*
* Returns CSS keyframe animation for pulsing glow effect.
* Should be injected into global styles or style tag once.
* Use unique animation names to avoid conflicts.
*
* @param animationName - Unique name for the animation (default: 'pulse')
* @returns CSS keyframes string
*
* @example
* ```typescript
* const keyframes = getPulsingKeyframes('pulse-glow');
* // Inject into global styles once:
* const style = document.createElement('style');
* style.innerHTML = keyframes;
* document.head.appendChild(style);
* ```
*
* @warning SSR and Duplicate Keyframes
* When using this in Server-Side Rendering (SSR) environments or with multiple
* component instances, ensure keyframe definitions are registered globally only once.
* Consider using a global registry or checking for existing keyframe definitions
* before injection to prevent duplicates and hydration mismatches. Example:
* ```typescript
* if (!document.querySelector(`style[data-keyframe="${animationName}"]`)) {
* const style = document.createElement('style');
* style.setAttribute('data-keyframe', animationName);
* style.innerHTML = getPulsingKeyframes(animationName);
* document.head.appendChild(style);
* }
* ```
*
* @korean 펄스애니메이션키프레임얻기
*/
export function getPulsingKeyframes(animationName: string = "pulse"): string {
return `
@keyframes ${animationName} {
0%, 100% {
opacity: 1;
transform: scale(1);
}
50% {
opacity: 0.8;
transform: scale(1.05);
}
}
`;
}
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