/**
 * @author Joe Pea / http://github.com/trusktr
 */

export interface HSL {
	h: number;
	s: number;
	l: number;
}

/**
 * Represents a color. See also {@link ColorUtils}.
 *
 * @example
 * var color = new THREE.Color( 0xff0000 );
 *
 * @see <a href="https://github.com/mrdoob/three.js/blob/master/src/math/Color.js">src/math/Color.js</a>
 */
export class Color {

	constructor( color?: Color | string | number );
	constructor( r: number, g: number, b: number );

	readonly isColor: true;

	/**
	 * Red channel value between 0 and 1. Default is 1.
	 */
	r: number;

	/**
	 * Green channel value between 0 and 1. Default is 1.
	 */
	g: number;

	/**
	 * Blue channel value between 0 and 1. Default is 1.
	 */
	b: number;

	set( color: Color ): Color;
	set( color: number ): Color;
	set( color: string ): Color;
	setScalar( scalar: number ): Color;
	setHex( hex: number ): Color;

	/**
	 * Sets this color from RGB values.
	 * @param r Red channel value between 0 and 1.
	 * @param g Green channel value between 0 and 1.
	 * @param b Blue channel value between 0 and 1.
	 */
	setRGB( r: number, g: number, b: number ): Color;

	/**
	 * Sets this color from HSL values.
	 * Based on MochiKit implementation by Bob Ippolito.
	 *
	 * @param h Hue channel value between 0 and 1.
	 * @param s Saturation value channel between 0 and 1.
	 * @param l Value channel value between 0 and 1.
	 */
	setHSL( h: number, s: number, l: number ): Color;

	/**
	 * Sets this color from a CSS context style string.
	 * @param contextStyle Color in CSS context style format.
	 */
	setStyle( style: string ): Color;

	/**
	 * Sets this color from a color name.
	 * Faster than {@link Color#setStyle .setStyle()} method if you don't need the other CSS-style formats.
	 * @param style Color name in X11 format.
	 */
	setColorName( style: string ): Color;

	/**
	 * Clones this color.
	 */
	clone(): this;

	/**
	 * Copies given color.
	 * @param color Color to copy.
	 */
	copy( color: Color ): this;

	/**
	 * Copies given color making conversion from gamma to linear space.
	 * @param color Color to copy.
	 */
	copyGammaToLinear( color: Color, gammaFactor?: number ): Color;

	/**
	 * Copies given color making conversion from linear to gamma space.
	 * @param color Color to copy.
	 */
	copyLinearToGamma( color: Color, gammaFactor?: number ): Color;

	/**
	 * Converts this color from gamma to linear space.
	 */
	convertGammaToLinear( gammaFactor?: number ): Color;

	/**
	 * Converts this color from linear to gamma space.
	 */
	convertLinearToGamma( gammaFactor?: number ): Color;

	/**
	 * Copies given color making conversion from sRGB to linear space.
	 * @param color Color to copy.
	 */
	copySRGBToLinear( color: Color ): Color;

	/**
	 * Copies given color making conversion from linear to sRGB space.
	 * @param color Color to copy.
	 */
	copyLinearToSRGB( color: Color ): Color;

	/**
	 * Converts this color from sRGB to linear space.
	 */
	convertSRGBToLinear(): Color;

	/**
	 * Converts this color from linear to sRGB space.
	 */
	convertLinearToSRGB(): Color;

	/**
	 * Returns the hexadecimal value of this color.
	 */
	getHex(): number;

	/**
	 * Returns the string formated hexadecimal value of this color.
	 */
	getHexString(): string;

	getHSL( target: HSL ): HSL;

	/**
	 * Returns the value of this color in CSS context style.
	 * Example: rgb(r, g, b)
	 */
	getStyle(): string;

	offsetHSL( h: number, s: number, l: number ): this;

	add( color: Color ): this;
	addColors( color1: Color, color2: Color ): this;
	addScalar( s: number ): this;
	sub( color: Color ): this;
	multiply( color: Color ): this;
	multiplyScalar( s: number ): this;
	lerp( color: Color, alpha: number ): this;
	lerpHSL( color: Color, alpha: number ): this;
	equals( color: Color ): boolean;

	/**
	 * Sets this color's red, green and blue value from the provided array.
	 * @param array the source array.
	 * @param offset (optional) offset into the array. Default is 0.
	 */
	fromArray( array: number[], offset?: number ): this;

	/**
	 * Sets this color's red, green and blue value from the provided array-like.
	 * @param array the source array-like.
	 * @param offset (optional) offset into the array-like. Default is 0.
	 */
	fromArray( array: ArrayLike<number>, offset?: number ): this;

	/**
	 * Returns an array [red, green, blue], or copies red, green and blue into the provided array.
	 * @param array (optional) array to store the color to. If this is not provided, a new array will be created.
	 * @param offset (optional) optional offset into the array.
	 * @return The created or provided array.
	 */
	toArray( array?: number[], offset?: number ): number[];

	/**
	 * Copies red, green and blue into the provided array-like.
	 * @param array array-like to store the color to.
	 * @param offset (optional) optional offset into the array-like.
	 * @return The provided array-like.
	 */
	toArray( xyz: ArrayLike<number>, offset?: number ): ArrayLike<number>;

	/**
	 * List of X11 color names.
	 */
	static NAMES: Record<string, number>;

}
