import { sanitizeAlphaFloat } from '../helpers'

const hslToHex = (hue, saturation, lightness) => {
  let rgb = hslToRgb(hue, saturation, lightness)
  let red = rgb.red.toString(16)
  let green = rgb.green.toString(16)
  let blue = rgb.blue.toString(16)

  if (red.length === 1) { red = "0" + red }
  if (green.length === 1) { green = "0" + green }
  if (blue.length === 1) { blue = "0" + blue }

  return "" + red + green + blue
}

const hslaToHexa = (hue, saturation, lightness, alpha) => {
  let rgb = hslToRgb(hue, saturation, lightness)
  let red = rgb.red.toString(16)
  let green = rgb.green.toString(16)
  let blue = rgb.blue.toString(16)
  let alphaHex = Math.round(sanitizeAlphaFloat(alpha) * 255).toString(16)

  if (red.length === 1) { red = "0" + red }
  if (green.length === 1) { green = "0" + green }
  if (blue.length === 1) { blue = "0" + blue }

  return "" + red + green + blue + alphaHex
}

const hslToRgb = (hue, saturation, lightness) => {
  if (hue === 360) { hue = 0 }
  if (hue < 0) { hue += 360 }

  saturation /= 100
  lightness /= 100

  let chroma = (1 - Math.abs(2 * lightness - 1)) * saturation,
    xComponent = chroma * (1 - Math.abs((hue / 60) % 2 - 1)),
    lightnessMatch = lightness - (chroma / 2),
    red = 0,
    green = 0,
    blue = 0

  // set red and green if hue between 0 and 119
  if (0 <= hue && hue < 60) {
    red = chroma
    green = xComponent
  } else if (60 <= hue && hue < 120) {
    red = xComponent
    green = chroma
  }
  // set green and blue if hue between 120 and 239
  else if (120 <= hue && hue < 180) {
    green = chroma
    blue = xComponent
  } else if (180 <= hue && hue < 240) {
    green = xComponent
    blue = chroma
  }
  // set red and blue if hue between 0 and 119
  else if (240 <= hue && hue < 300) {
    red = xComponent
    blue = chroma
  } else if (300 <= hue && hue < 360) {
    red = chroma
    blue = xComponent
  }

  red = Math.round((red + lightnessMatch) * 255)
  green = Math.round((green + lightnessMatch) * 255)
  blue = Math.round((blue + lightnessMatch) * 255)

  return { "red": red, "green": green, "blue": blue }
}

const hslaToRgba = (hue, saturation, lightness, alpha) => {
  let rgb = hslToRgb(hue, saturation, lightness)
  return { "red": rgb.red, "green": rgb.green, "blue": rgb.blue, "alpha": sanitizeAlphaFloat(alpha) }
}

export { hslToHex, hslaToHexa, hslToRgb, hslaToRgba }