import { isPlainObject, isNumber, isString, isArray } from '@antv/util';
import checkCSSRule from './cssRule';

// 默认设置50
let ONE_REM: number;
try {
  // xgraph下这段会抛错
  ONE_REM = parseInt(document.documentElement.style.fontSize, 10) || 50;
} catch (e) {
  ONE_REM = 50;
}
const SCALE = ONE_REM / 100;

/**
 * 像素转换
 * @param {Number} px - 750视觉稿像素
 * @return {Number} 屏幕上实际像素
 */
function defaultPx2hd(px: number): number {
  if (!px) {
    return 0;
  }
  return Number((px * SCALE).toFixed(1));
}

function parsePadding(padding: number | number[]) {
  if (isNumber(padding)) {
    return [padding, padding, padding, padding];
  }
  const top = padding[0];
  const right = isNumber(padding[1]) ? padding[1] : padding[0];
  const bottom = isNumber(padding[2]) ? padding[2] : top;
  const left = isNumber(padding[3]) ? padding[3] : right;
  return [top, right, bottom, left];
}

function batch2hd(px2hd) {
  const batchPx2hd = (value: number | number[] | string | string[] | any) => {
    // 处理带px的数据
    if (isString(value) && /^-?\d+(\.\d+)?px$/.test(value)) {
      const num = value.substr(0, value.length - 2);
      return px2hd(Number(num));
    }
    if (isArray(value)) {
      return value.map((v) => {
        return batchPx2hd(v);
      });
    }
    if (isPlainObject(value)) {
      const result = {};
      for (const key in value) {
        if (value.hasOwnProperty(key)) {
          const rst = batchPx2hd(value[key]);
          if (!rst) {
            result[key] = rst;
            continue;
          }
          if (key === 'padding' || key === 'margin') {
            const paddingArray = parsePadding(rst);
            result[key] = paddingArray;
            result[`${key}Top`] = paddingArray[0];
            result[`${key}Right`] = paddingArray[1];
            result[`${key}Bottom`] = paddingArray[2];
            result[`${key}Left`] = paddingArray[3];
            continue;
          }
          result[key] = rst;
        }
      }
      return result;
    }
    // 默认直接返回
    return value;
  };
  return batchPx2hd;
}

const px2hd = batch2hd(defaultPx2hd);

export { px2hd, batch2hd, parsePadding, checkCSSRule };