import { knownNamedColors } from './known-named-colors';

const NAMED_COLORS = Object.keys(knownNamedColors);
const GRADIENT_TYPES = ['linear', 'radial', 'conic'] as const;
const LESS_COLOR_FUNCTIONS = [
	'lighten',
	'darken',
	'saturate',
	'desaturate',
	'fadein',
	'fadeout',
	'fade',
	'spin',
	'mix',
	'greyscale',
	'contrast',
	'multiply',
	'screen',
	'overlay',
	'softlight',
	'hardlight',
	'difference',
	'exclusion',
	'average',
	'negation',
	'tint',
	'shade',
	'luma',
	'hue',
	'saturation',
	'lightness',
	'alpha',
	'red',
	'green',
	'blue',
];

const REGEXES = {
	// The CSS regular expression matches CSS variable declarations.
	// It looks for the string "var(" followed by any characters except a closing parenthesis, and ending with a closing parenthesis.
	CSS: /var\([^\)]+\)/g,
	// The RAW_COLOR regular expression matches various CSS color formats including hexadecimal, RGB(A), HSL(A), LAB, LCH, and HWB.
	// It allows for optional leading and trailing white spaces.
	// For RGBA and HSLA, it allows any number (including negative numbers and numbers greater than 1) for the alpha channel.
	// For RGB, HSL, LAB, LCH, and HWB, it expects three comma-separated values.
	// It also allows optional white spaces around the commas and the values.
	RAW_COLOR:
		/^\s*(#([0-9a-f]{3}){1,2}|(rgba|hsla)\(\s*\d{1,3}%?\s*(,\s*\d{1,3}%?\s*){2},\s*-?\d*\.?\d+\s*\)|(rgb|hsl)\(\s*\d{1,3}%?\s*(,\s*\d{1,3}%?\s*){2}\)\s*|(lab|lch)\(\s*\d{1,3}%?\s+\d{1,3}%?\s+\d{1,3}%?\s*\)|hwb\(\s*\d{1,3}\s+\d{1,3}%?\s+\d{1,3}%?\s*\))\s*$/i,
};

export function isRawColor(value: string): boolean {
	return REGEXES.RAW_COLOR.test(value);
}
export function isNamedColor(value: string): boolean {
	return NAMED_COLORS.includes(value);
}
export function isGradient(value: string): boolean {
	return GRADIENT_TYPES.some((gradient) => value.startsWith(`${gradient}-gradient(`));
}
export function isLessFunction(value: string): boolean {
	return LESS_COLOR_FUNCTIONS.some((func) => value.startsWith(`${func}(`));
}
export { isKnownCssVariable } from './is-known-css-variable';
export { extractBetweenParentheses } from './extract-between-parentheses';