/**
 * Layer Effects Type Definitions
 * Non-destructive visual effects for layers (inspired by Photoshop Layer Styles)
 */

export type EffectType =
  | 'dropShadow'
  | 'innerShadow'
  | 'outerGlow'
  | 'innerGlow'
  | 'stroke'
  | 'bevel'
  | 'colorOverlay'
  | 'gradientOverlay'
  | 'patternOverlay'
  | 'satin';

export type BlendMode =
  | 'normal'
  | 'multiply'
  | 'screen'
  | 'overlay'
  | 'soft-light'
  | 'hard-light'
  | 'color-dodge'
  | 'color-burn'
  | 'darken'
  | 'lighten';

export type GradientType = 'linear' | 'radial' | 'angle';
export type StrokePosition = 'outside' | 'inside' | 'center';
export type BevelStyle = 'outer-bevel' | 'inner-bevel' | 'emboss' | 'pillow-emboss';
export type BevelDirection = 'up' | 'down';

/**
 * Base effect interface - all effects extend this
 */
export interface BaseEffect {
  id: string;
  type: EffectType;
  enabled: boolean;
  blendMode: BlendMode;
  opacity: number; // 0-1
}

/**
 * Drop Shadow Effect
 * Casts a shadow behind the layer
 */
export interface DropShadowEffect extends BaseEffect {
  type: 'dropShadow';
  color: string;
  angle: number; // degrees 0-360
  distance: number; // pixels
  spread: number; // 0-100%
  size: number; // blur radius in pixels
  useGlobalLight: boolean;
}

/**
 * Inner Shadow Effect
 * Shadow appears inside the layer
 */
export interface InnerShadowEffect extends BaseEffect {
  type: 'innerShadow';
  color: string;
  angle: number;
  distance: number;
  choke: number; // 0-100%, similar to spread but inward
  size: number;
  useGlobalLight: boolean;
}

/**
 * Outer Glow Effect
 * Soft glow around the outside edges
 */
export interface OuterGlowEffect extends BaseEffect {
  type: 'outerGlow';
  color: string;
  spread: number; // 0-100%
  size: number; // blur radius
  technique: 'softer' | 'precise';
  range: number; // 0-100%
}

/**
 * Inner Glow Effect
 * Glow from the edges inward
 */
export interface InnerGlowEffect extends BaseEffect {
  type: 'innerGlow';
  color: string;
  source: 'edge' | 'center';
  choke: number; // 0-100%
  size: number;
  technique: 'softer' | 'precise';
  range: number;
}

/**
 * Stroke Effect
 * Outline around the layer
 */
export interface StrokeEffect extends BaseEffect {
  type: 'stroke';
  size: number; // stroke width in pixels
  position: StrokePosition;
  fillType: 'color' | 'gradient' | 'pattern';
  color: string; // for solid color
  gradient?: {
    type: GradientType;
    colors: Array<{ color: string; position: number }>; // position 0-1
    angle: number;
  };
  pattern?: {
    id: string;
    scale: number;
  };
}

/**
 * Bevel & Emboss Effect
 * Creates 3D depth effect
 */
export interface BevelEffect extends BaseEffect {
  type: 'bevel';
  style: BevelStyle;
  technique: 'smooth' | 'chisel-hard' | 'chisel-soft';
  depth: number; // 0-1000%
  direction: BevelDirection;
  size: number; // pixels
  soften: number; // pixels
  angle: number; // light angle
  altitude: number; // light altitude 0-90 degrees
  useGlobalLight: boolean;
  highlightMode: BlendMode;
  highlightOpacity: number;
  highlightColor: string;
  shadowMode: BlendMode;
  shadowOpacity: number;
  shadowColor: string;
}

/**
 * Color Overlay Effect
 * Fills the layer with a solid color
 */
export interface ColorOverlayEffect extends BaseEffect {
  type: 'colorOverlay';
  color: string;
}

/**
 * Gradient Overlay Effect
 * Fills the layer with a gradient
 */
export interface GradientOverlayEffect extends BaseEffect {
  type: 'gradientOverlay';
  gradient: {
    type: GradientType;
    colors: Array<{ color: string; position: number }>;
    angle: number;
    scale: number; // 0-150%
    reverse: boolean;
    alignWithLayer: boolean;
  };
}

/**
 * Pattern Overlay Effect
 * Fills the layer with a repeating pattern
 */
export interface PatternOverlayEffect extends BaseEffect {
  type: 'patternOverlay';
  pattern: {
    id: string;
    scale: number; // percentage
    snapToOrigin: boolean;
  };
}

/**
 * Satin Effect
 * Creates soft interior shading
 */
export interface SatinEffect extends BaseEffect {
  type: 'satin';
  color: string;
  angle: number;
  distance: number;
  size: number; // blur
  contour: 'linear' | 'gaussian' | 'cone' | 'cove';
  invert: boolean;
}

/**
 * Union type of all effect types
 */
export type LayerEffect =
  | DropShadowEffect
  | InnerShadowEffect
  | OuterGlowEffect
  | InnerGlowEffect
  | StrokeEffect
  | BevelEffect
  | ColorOverlayEffect
  | GradientOverlayEffect
  | PatternOverlayEffect
  | SatinEffect;

/**
 * Layer effects configuration for a single layer
 */
export interface LayerEffectsConfig {
  layerId: string;
  effects: LayerEffect[];
  enabled: boolean; // Master switch for all effects
  globalLightAngle: number; // Shared light angle (default 120°)
  globalLightAltitude: number; // Shared light altitude (default 30°)
}

/**
 * Effect presets for quick application
 */
export interface EffectPreset {
  id: string;
  name: string;
  description?: string;
  thumbnail?: string;
  effects: Omit<LayerEffect, 'id'>[];
}

/**
 * Default effect configurations
 */
export const DEFAULT_DROP_SHADOW: Omit<DropShadowEffect, 'id'> = {
  type: 'dropShadow',
  enabled: true,
  blendMode: 'multiply',
  opacity: 0.75,
  color: '#000000',
  angle: 120,
  distance: 5,
  spread: 0,
  size: 5,
  useGlobalLight: true,
};

export const DEFAULT_OUTER_GLOW: Omit<OuterGlowEffect, 'id'> = {
  type: 'outerGlow',
  enabled: true,
  blendMode: 'screen',
  opacity: 0.75,
  color: '#ffffff',
  spread: 0,
  size: 5,
  technique: 'softer',
  range: 50,
};

export const DEFAULT_STROKE: Omit<StrokeEffect, 'id'> = {
  type: 'stroke',
  enabled: true,
  blendMode: 'normal',
  opacity: 1,
  size: 3,
  position: 'outside',
  fillType: 'color',
  color: '#000000',
};

export const DEFAULT_COLOR_OVERLAY: Omit<ColorOverlayEffect, 'id'> = {
  type: 'colorOverlay',
  enabled: true,
  blendMode: 'normal',
  opacity: 1,
  color: '#000000',
};

export const DEFAULT_INNER_SHADOW: Omit<InnerShadowEffect, 'id'> = {
  type: 'innerShadow',
  enabled: true,
  blendMode: 'multiply',
  opacity: 0.75,
  color: '#000000',
  angle: 120,
  distance: 5,
  choke: 0,
  size: 5,
  useGlobalLight: true,
};

export const DEFAULT_INNER_GLOW: Omit<InnerGlowEffect, 'id'> = {
  type: 'innerGlow',
  enabled: true,
  blendMode: 'screen',
  opacity: 0.75,
  color: '#ffffff',
  source: 'edge',
  choke: 0,
  size: 5,
  technique: 'softer',
  range: 50,
};

export const DEFAULT_BEVEL: Omit<BevelEffect, 'id'> = {
  type: 'bevel',
  enabled: true,
  blendMode: 'normal',
  opacity: 1,
  style: 'inner-bevel',
  technique: 'smooth',
  depth: 100,
  direction: 'up',
  size: 5,
  soften: 0,
  angle: 120,
  altitude: 30,
  useGlobalLight: true,
  highlightMode: 'screen',
  highlightOpacity: 0.75,
  highlightColor: '#ffffff',
  shadowMode: 'multiply',
  shadowOpacity: 0.75,
  shadowColor: '#000000',
};