/**
 * 锚点插件，为UEditor提供插入锚点支持
 * @file
 * @since 1.2.6.1
 */
UE.plugin.register("anchor", function() {
  return {
    bindEvents: {
      ready: function() {
        utils.cssRule(
          "anchor",
          ".anchorclass{background: url('" +
            this.options.themePath +
            this.options.theme +
            "/images/anchor.gif') no-repeat scroll left center transparent;cursor: auto;display: inline-block;height: 16px;width: 15px;}",
          this.document
        );
      }
    },
    outputRule: function(root) {
      utils.each(root.getNodesByTagName("img"), function(a) {
        var val;
        if ((val = a.getAttr("anchorname"))) {
          a.tagName = "a";
          a.setAttr({
            anchorname: "",
            name: val,
            class: ""
          });
        }
      });
    },
    inputRule: function(root) {
      utils.each(root.getNodesByTagName("a"), function(a) {
        var val;
        if ((val = a.getAttr("name")) && !a.getAttr("href")) {
          //过滤掉word冗余标签
          //_Toc\d+有可能勿命中
          if (/^\_Toc\d+$/.test(val)) {
            a.parentNode.removeChild(a);
            return;
          }
          a.tagName = "img";
          a.setAttr({
            anchorname: a.getAttr("name"),
            class: "anchorclass"
          });
          a.setAttr("name");
        }
      });
    },
    commands: {
      /**
            * 插入锚点
            * @command anchor
            * @method execCommand
            * @param { String } cmd 命令字符串
            * @param { String } name 锚点名称字符串
            * @example
            * ```javascript
            * //editor 是编辑器实例
            * editor.execCommand('anchor', 'anchor1');
            * ```
            */
      anchor: {
        execCommand: function(cmd, name) {
          var range = this.selection.getRange(),
            img = range.getClosedNode();
          if (img && img.getAttribute("anchorname")) {
            if (name) {
              img.setAttribute("anchorname", name);
            } else {
              range.setStartBefore(img).setCursor();
              domUtils.remove(img);
            }
          } else {
            if (name) {
              //只在选区的开始插入
              var anchor = this.document.createElement("img");
              range.collapse(true);
              domUtils.setAttributes(anchor, {
                anchorname: name,
                class: "anchorclass"
              });
              range
                .insertNode(anchor)
                .setStartAfter(anchor)
                .setCursor(false, true);
            }
          }
        }
      }
    }
  };
});