import { omit, kebabCase } from './index'

export const colorsToExclude = [
  'inherit',
  'transparent',
  'current',
  'white',
  'black',
  'slate',
  'gray',
  'zinc',
  'neutral',
  'stone',
  'cool'
]

export const excludeColors = (colors: object) => Object.keys(omit(colors, colorsToExclude)).map(color => kebabCase(color)) as string[]

export const colorsAsRegex = (colors: string[]): string => colors.join('|')

export const hexToRgb = (hex) => {
  // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
  const shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i
  hex = hex.replace(shorthandRegex, function (_, r, g, b) {
    return r + r + g + g + b + b
  })

  const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
  return result
    ? `${parseInt(result[1], 16)} ${parseInt(result[2], 16)} ${parseInt(result[3], 16)}`
    : null
}