///import core
///commands 当输入内容超过编辑器高度时，编辑器自动增高
///commandsName  AutoHeight,autoHeightEnabled
///commandsTitle  自动增高
/**
 * @description 自动伸展
 * @author zhanyi
 */
UE.plugins["autoheight"] = function() {
  var me = this;
  //提供开关，就算加载也可以关闭
  me.autoHeightEnabled = me.options.autoHeightEnabled !== false;
  if (!me.autoHeightEnabled) {
    return;
  }

  var bakOverflow,
    lastHeight = 0,
    options = me.options,
    currentHeight,
    timer;

  function adjustHeight() {
    var me = this;
    clearTimeout(timer);
    if (isFullscreen) return;
    if (
      !me.queryCommandState ||
      (me.queryCommandState && me.queryCommandState("source") != 1)
    ) {
      timer = setTimeout(function() {
        var node = me.body.lastChild;
        while (node && node.nodeType != 1) {
          node = node.previousSibling;
        }
        if (node && node.nodeType == 1) {
          node.style.clear = "both";
          currentHeight = Math.max(
            domUtils.getXY(node).y + node.offsetHeight + 25,
            Math.max(options.minFrameHeight, options.initialFrameHeight)
          );
          if (currentHeight != lastHeight) {
            if (currentHeight !== parseInt(me.iframe.parentNode.style.height)) {
              me.iframe.parentNode.style.height = currentHeight + "px";
            }
            me.body.style.height = currentHeight + "px";
            lastHeight = currentHeight;
          }
          domUtils.removeStyle(node, "clear");
        }
      }, 50);
    }
  }
  var isFullscreen;
  me.addListener("fullscreenchanged", function(cmd, f) {
    isFullscreen = f;
  });
  me.addListener("destroy", function() {
    domUtils.un(me.window, "scroll", fixedScrollTop);
    me.removeListener(
      "contentchange afterinserthtml keyup mouseup",
      adjustHeight
    );
  });
  me.enableAutoHeight = function() {
    var me = this;
    if (!me.autoHeightEnabled) {
      return;
    }
    var doc = me.document;
    me.autoHeightEnabled = true;
    bakOverflow = doc.body.style.overflowY;
    doc.body.style.overflowY = "hidden";
    me.addListener("contentchange afterinserthtml keyup mouseup", adjustHeight);
    //ff不给事件算得不对

    setTimeout(function() {
      adjustHeight.call(me);
    }, browser.gecko ? 100 : 0);
    me.fireEvent("autoheightchanged", me.autoHeightEnabled);
  };
  me.disableAutoHeight = function() {
    me.body.style.overflowY = bakOverflow || "";

    me.removeListener("contentchange", adjustHeight);
    me.removeListener("keyup", adjustHeight);
    me.removeListener("mouseup", adjustHeight);
    me.autoHeightEnabled = false;
    me.fireEvent("autoheightchanged", me.autoHeightEnabled);
  };

  me.on("setHeight", function() {
    me.disableAutoHeight();
  });
  me.addListener("ready", function() {
    me.enableAutoHeight();
    //trace:1764
    var timer;
    domUtils.on(
      browser.ie ? me.body : me.document,
      browser.webkit ? "dragover" : "drop",
      function() {
        clearTimeout(timer);
        timer = setTimeout(function() {
          //trace:3681
          adjustHeight.call(me);
        }, 100);
      }
    );
    //修复内容过多时，回到顶部，顶部内容被工具栏遮挡问题
    domUtils.on(me.window, "scroll", fixedScrollTop);
  });

  var lastScrollY;

  function fixedScrollTop() {
    if (!me.window) return;
    if (lastScrollY === null) {
      lastScrollY = me.window.scrollY;
    } else if (me.window.scrollY == 0 && lastScrollY != 0) {
      me.window.scrollTo(0, 0);
      lastScrollY = null;
    }
  }
};