/**
 * 点击波纹效果
 *
 * @param  {[event]} e        [description]
 * @param  {[Object]} arg_opts [description]
 * @return {[bollean]}          [description]
 */
export default function(e, arg_opts) {
  const opts = Object.assign({
      ele: e.target, // 波纹作用元素
      type: 'hit', // hit点击位置扩散center中心点扩展
      bgc: 'rgba(0, 0, 0, 0.15)' // 波纹颜色
    }, arg_opts),
    target = opts.ele;
  if (target) {
    const rect = target.getBoundingClientRect();
    let ripple = target.querySelector('.e-ripple');
    if (!ripple) {
      ripple = document.createElement('span');
      ripple.className = 'e-ripple';
      ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px';
      target.appendChild(ripple);
    } else {
      ripple.className = 'e-ripple';
    }
    switch (opts.type) {
      case 'center':
        ripple.style.top = (rect.height / 2 - ripple.offsetHeight / 2) + 'px';
        ripple.style.left = (rect.width / 2 - ripple.offsetWidth / 2) + 'px';
        break;
      default:
        ripple.style.top = (e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop) + 'px';
        ripple.style.left = (e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft) + 'px';
    }
    ripple.style.backgroundColor = opts.bgc;
    ripple.className = 'e-ripple z-active';
    return false;
  }
};