import { darkTheme, lightTheme } from '../theme';

const getContrastColor = (hexColor: string) => {
  if (hexColor.startsWith('#')) {
    hexColor = hexColor.slice(1);
  }

  const r = Number.parseInt(hexColor.slice(0, 2), 16);
  const g = Number.parseInt(hexColor.slice(2, 4), 16);
  const b = Number.parseInt(hexColor.slice(4, 6), 16);
  const brightness = (r * 299 + g * 587 + b * 114) / 1000;

  return brightness > 128
    ? lightTheme.colors.onBackground
    : darkTheme.colors.onBackground;
};

const isHexColor = (color: string) => {
  return /^#([\da-f]{6})$/i.test(color);
};

const isRgbColor = (color: string) => {
  return /^rgb\((\d{1,3}), ?(\d{1,3}), ?(\d{1,3})\)$/i.test(color);
};

const rgbToHex = (rgb: string) => {
  const [r, g, b] = rgb
    .replaceAll(/[^\d,]/g, '')
    .split(',')
    .map(value => Number.parseInt(value, 10));

  return `#${r.toString(16)}${g.toString(16)}${b.toString(16)}`;
};

const rgbToRgba = (rgb: string, alpha: number) => {
  const [r, g, b] = rgb
    .replaceAll(/[^\d,]/g, '')
    .split(',')
    .map(value => Number.parseInt(value, 10));

  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
};

const generateRandomColor = () => {
  const r = Math.floor(Math.random() * 256)
    .toString(16)
    .padStart(2, '0');
  const g = Math.floor(Math.random() * 256)
    .toString(16)
    .padStart(2, '0');
  const b = Math.floor(Math.random() * 256)
    .toString(16)
    .padStart(2, '0');
  return `#${r}${g}${b}`;
};

export {
  getContrastColor,
  isHexColor,
  isRgbColor,
  rgbToHex,
  rgbToRgba,
  generateRandomColor,
};