import { isObject } from './is/index';

export function deepMerge<T = any>(src: any = {}, target: any = {}): T {
  let key: string;
  for (key in target) {
    src[key] = isObject(src[key]) ? deepMerge(src[key], target[key]) : (src[key] = target[key]);
  }
  return src;
}

/**
 * Sums the passed percentage to the R, G or B of a HEX color
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed part of the color
 */
function addLight(color: string, amount: number) {
  const cc = parseInt(color, 16) + amount;
  const c = cc > 255 ? 255 : cc;
  return c.toString(16).length > 1 ? c.toString(16) : `0${c.toString(16)}`;
}

/**
 * Darkens a HEX color given the passed percentage
 * @param {string} color The color to process
 * @param {number} amount The amount to change the color by
 * @returns {string} The HEX representation of the processed color
 */
export function darken(color: string, amount: number) {
  color = color.indexOf('#') >= 0 ? color.substring(1, color.length) : color;
  amount = Math.trunc((255 * amount) / 100);
  return `#${subtractLight(color.substring(0, 2), amount)}${subtractLight(
    color.substring(2, 4),
    amount
  )}${subtractLight(color.substring(4, 6), amount)}`;
}

/**
 * Lightens a 6 char HEX color according to the passed percentage
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed color represented as HEX
 */
export function lighten(color: string, amount: number) {
  color = color.indexOf('#') >= 0 ? color.substring(1, color.length) : color;
  amount = Math.trunc((255 * amount) / 100);
  return `#${addLight(color.substring(0, 2), amount)}${addLight(
    color.substring(2, 4),
    amount
  )}${addLight(color.substring(4, 6), amount)}`;
}

/**
 * 判断是否 url
 * */
const RegExp = /^http(s)?:\/\//iu;
export function isUrl(url: string) {
  return RegExp.test(url);
}

/**
 * 一维数组转二维数组
 * */
export function arrayTrans(arr: number[]): number[][] {
  const newArr: number[][] = [];
  while (arr.length > 0) {
    newArr.push(arr.splice(0, 2));
  }
  return newArr;
}

/**
 * Subtracts the indicated percentage to the R, G or B of a HEX color
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed part of the color
 */
function subtractLight(color: string, amount: number) {
  const cc = parseInt(color, 16) - amount;
  const c = cc < 0 ? 0 : cc;
  return c.toString(16).length > 1 ? c.toString(16) : `0${c.toString(16)}`;
}

export function hexToRgba(hex: string, opacity: number) {
  const shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
  hex = hex.replace(shorthandRegex, function (m, 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);
  opacity = opacity >= 0 && opacity <= 1 ? Number(opacity) : 1;
  return result
    ? 'rgba(' +
        [parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16), opacity].join(
          ','
        ) +
        ')'
    : hex;
}