export default {
  bind(el, binding, vnode, oldVnode) {
    const resizeEvent = new CustomEvent("drag-resize", {
      detail: "尺寸变化",
      bubbles: false,
    });
    // 初始化不最大化
    el.fullscreen = false;
    // 弹框可拉伸最小宽高
    const minWidth = 1100;
    const minHeight = 570;
    // 当前宽高
    let nowWidth = minWidth;
    // eslint-disable-next-line no-unused-vars
    let nowHight = minHeight;
    // 当前顶部高度
    let nowMarginTop = 0;
    // 获取弹框头部（这部分可双击全屏）
    const dialogHeaderEl = el.querySelector(".el-dialog__header");
    let hasSetBodyHight = false;
    // 弹窗
    const dragDom = el.querySelector(".el-dialog");
    el.style.overflow = "initial";
    dragDom.className += " el-drag-dialog";
    // 给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
    dragDom.style.overflow = "auto";
    // 清除选择头部文字效果
    // eslint-disable-next-line no-new-func
    dialogHeaderEl.onselectstart = new Function("return false");
    // 头部加上可拖动cursor
    dialogHeaderEl.style.cursor = "move";

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

    // 头部插入最大化最小化元素
    const maxMin = document.createElement("button");
    maxMin.className += " el-dialog__headerbtn el-dialog__minmax";
    maxMin.style.right = "40px";
    maxMin.style.color = "#ffffff";
    maxMin.title = el.fullscreen ? "还原" : "最大化";
    maxMin.innerHTML =
      "<i class=" +
      (el.fullscreen ? '"el-icon-crop"' : '"el-icon-full-screen"') +
      " onMouseOver=\"this.style.color='#409EFF'\" onMouseOut=\"this.style.color='inherit'\"></i>";
    dialogHeaderEl.insertBefore(maxMin, dialogHeaderEl.childNodes[1]);
    const moveDown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes("%")) {
        styL =
          +document.body.clientWidth * (+sty.left.replace(/\\%/g, "") / 100);
        styT =
          +document.body.clientHeight * (+sty.top.replace(/\\%/g, "") / 100);
      } else {
        styL = +sty.left.replace(/\px/g, "");
        styT = +sty.top.replace(/\px/g, "");
      }

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

        // 移动当前元素
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      };

      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
    dialogHeaderEl.onmousedown = moveDown;
    let bodyHeight = "auto";

    function setMaxMin() {
      if (el.fullscreen) {
        let i = maxMin.querySelector(".el-icon-crop");
        i.classList.remove("el-icon-crop");
        i.classList.add("el-icon-full-screen");
        maxMin.innerHTML = '<i class="el-icon-full-screen"></i>';
        maxMin.title = "最大化";
        dragDom.style.height = nowHight + "px";
        dragDom.style.width = nowWidth + "px";
        dragDom.style.marginTop = window.innerHeight * 0.07 + "px";
        el.fullscreen = false;
        dialogHeaderEl.style.cursor = "move";
        dialogHeaderEl.onmousedown = moveDown;
        // dragDom.querySelector('.el-dialog__body').style.height = bodyHeight;
        hasSetBodyHight = false;
      } else {
        const i = maxMin.querySelector(".el-icon-full-screen");
        i.classList.remove("el-icon-full-screen");
        i.classList.add("el-icon-crop");
        maxMin.title = "还原";
        bodyHeight =
          dragDom.querySelector(".el-dialog__body").offsetHeight + "px";
        nowHight = dragDom.clientHeight;
        nowWidth = dragDom.clientWidth;
        nowMarginTop = dragDom.style.marginTop;
        dragDom.style.left = 0;
        dragDom.style.top = 0;
        dragDom.style.height = window.innerHeight + "px";
        dragDom.style.width = "100VW";
        dragDom.style.marginTop = 0;
        el.fullscreen = true;
        dialogHeaderEl.style.cursor = "initial";
        dialogHeaderEl.onmousedown = null;
        if (!hasSetBodyHight) {
          const footerHeight =
            dragDom.querySelector(".el-dialog__footer") &&
            dragDom.querySelector(".el-dialog__footer").offsetHeight;
          dragDom.querySelector(".el-dialog__body").style.height =
            "calc(90% - " +
            (dialogHeaderEl.offsetHeight + footerHeight) +
            "px)";
          /*          dragDom.querySelector('.el-dialog__body').style.height =
              window.innerHeight*0.9
               - (dialogHeaderEl.offsetHeight + footerHeight) + 'px'*/
          hasSetBodyHight = true;
        }
      }
      el.dispatchEvent(resizeEvent);
    }

    // 点击放大缩小效果
    maxMin.onclick = setMaxMin;
    // 双击头部效果
    dialogHeaderEl.ondblclick = setMaxMin;
    // 拉伸
    const resizeEl = document.createElement("div");
    dragDom.appendChild(resizeEl);
    // 在弹窗右下角加上一个10-10px的控制块
    resizeEl.style.cursor = "se-resize";
    resizeEl.style.position = "absolute";
    resizeEl.style.height = "10px";
    resizeEl.style.width = "10px";
    resizeEl.style.right = "0px";
    resizeEl.style.bottom = "0px";
    resizeEl.style.zIndex = "99";
    // 鼠标拉伸弹窗
    resizeEl.onmousedown = (e) => {
      // 记录初始x位置
      const clientX = e.clientX;
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - resizeEl.offsetLeft;
      const disY = e.clientY - resizeEl.offsetTop;
      document.onmousemove = function (e) {
        e.preventDefault(); // 移动时禁用默认事件
        // 通过事件委托，计算移动的距离
        const x = e.clientX - disX + (e.clientX - clientX); // 这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
        const y = e.clientY - disY;
        // 比较是否小于最小宽高
        dragDom.style.width = x > minWidth ? `${x}px` : minWidth + "px";
        dragDom.style.height = y > minHeight ? `${y}px` : minHeight + "px";
        if (!hasSetBodyHight) {
          const footerHeight =
            dragDom.querySelector(".el-dialog__footer") &&
            dragDom.querySelector(".el-dialog__footer").offsetHeight;
          dragDom.querySelector(".el-dialog__body").style.height =
            "calc(90% - " +
            (dialogHeaderEl.offsetHeight + footerHeight) +
            "px)";
          hasSetBodyHight = true;
        }
      };
      // 拉伸结束
      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
        el.dispatchEvent(resizeEvent);
      };
    };
  },
};
