// 高亮关键词
export const replaceToBright = (str: string = ''): string => {
  if (typeof str !== 'string') {
    return str;
  }
  return str.replace(/\[(.+?)\]/ig, '<em>$1</em>');
}

// 换行
export const replaceToBreak = (str: string = '', pattern = /\^/g): string => {
  if (typeof str !== 'string') {
    return str;
  }
  return str.replace(pattern, '<br />');
}

// 空格
export const replaceToSpace = (str: string = ''): string => {
  if (typeof str !== 'string') {
    return str;
  }
  return str.replace(/\&/g, '&nbsp;');
}


// 滚动条在Y轴上的滚动距离
export const getScrollTop = () => {
  let scrollTop = 0; let bodyScrollTop = 0; let documentScrollTop = 0;
  if (document.body) {
    bodyScrollTop = document.body.scrollTop;
  }
  if (document.documentElement) {
    documentScrollTop = document.documentElement.scrollTop;
  }
  scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
  return scrollTop;
};
// 文档的总高度
export const getScrollHeight = () => {
  let scrollHeight = 0; let bodyScrollHeight = 0; let documentScrollHeight = 0;
  if (document.body) {
    bodyScrollHeight = document.body.scrollHeight;
  }
  if (document.documentElement) {
    documentScrollHeight = document.documentElement.scrollHeight;
  }
  scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;
  return scrollHeight;
};
// 浏览器视口的高度
export const getWindowHeight = () => {
  let windowHeight = 0;
  if (document.compatMode === 'CSS1Compat') {
    windowHeight = document.documentElement.clientHeight;
  } else {
    windowHeight = document.body.clientHeight;
  }
  return windowHeight;
};

// url 转 object
export const queryStrToParse = (name: string, queryString: string) => {
  if (queryString.indexOf('?') > -1) {
    const [, paramsStr] = queryString.split('?');

    const params = paramsStr.split('&');

    const queryObject = {};
    for (let index = 0, lens = params.length; index < lens; index++) {
      const element = params[index];
      const [key, value] = element.split('=');
      queryObject[key] = value;
    }

    return queryObject[name];
  };
}