/**version-1.0*/
import indexUtil0 from "../../utils/index.js"
let indexUtil = indexUtil0;
let modules = {};
modules = {
  bind(el, binding, vnode) {
    let dialogHeaderEl = el.querySelector('.el-dialog__header');
    let dragDom = el.querySelector('.el-dialog');
    dialogHeaderEl.style.cssText += ';cursor:move;';
    dragDom.style.cssText += ';top:0px;';

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    let getStyle = function(dom, attr) {
      if (window.document.currentStyle) {
        return dom.currentStyle[attr];
      } else {
        return getComputedStyle(dom, false)[attr];
      }
    };

    dialogHeaderEl.onmousedown = function(e) {
      indexUtil.addClass(document.body, 'resize-ing');

      // 鼠标按下，计算当前元素距离可视区的距离
      let disX = e.clientX - dialogHeaderEl.offsetLeft;
      let disY = e.clientY - dialogHeaderEl.offsetTop;

      let dragDomWidth = dragDom.offsetWidth;
      let dragDomHeight = dragDom.offsetHeight;

      let screenWidth = document.body.clientWidth;
      let screenHeight = document.body.clientHeight;

      let minDragDomLeft = dragDom.offsetLeft;
      let maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;

      let minDragDomTop = dragDom.offsetTop;
      let maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeight;

      // 获取到的值带px 正则匹配替换
      let styL = getStyle(dragDom, 'left');
      let styT = getStyle(dragDom, 'top');

      if (styL.includes('%')) {
        styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
        styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100);
      } else {
        styL = +styL.replace(/\px/g, '');
        styT = +styT.replace(/\px/g, '');
      }

      document.onmousemove = function(e) {
        // 通过事件委托，计算移动的距离
        let left = e.clientX - disX;
        let top = e.clientY - disY;

        // 边界处理
        if (-(left) > minDragDomLeft) {
          left = -minDragDomLeft;
        } else if (left > maxDragDomLeft) {
          left = maxDragDomLeft;
        }

        if (-(top) > minDragDomTop) {
          top = -minDragDomTop;
        } else if (top > maxDragDomTop) {
          top = maxDragDomTop;
        }

        // 移动当前元素
        dragDom.style.cssText += ';left:'+(left + styL)+'px;top:'+(top + styT)+'px;';

        // emit onDrag event
        vnode.child.$emit('dragDialog');
      };

      document.onmouseup = function(e) {
        indexUtil.removeClass(document.body, 'resize-ing');
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
  }
};

export default modules
