/**
 * 超链接
 * @file
 * @since 1.2.6.1
 */

/**
 * 插入超链接
 * @command link
 * @method execCommand
 * @param { String } cmd 命令字符串
 * @param { Object } options   设置自定义属性，例如：url、title、target
 * @example
 * ```javascript
 * editor.execCommand( 'link', '{
 *     url:'ueditor.baidu.com',
 *     title:'ueditor',
 *     target:'_blank'
 * }' );
 * ```
 */
/**
 * 返回当前选中的第一个超链接节点
 * @command link
 * @method queryCommandValue
 * @param { String } cmd 命令字符串
 * @return { Element } 超链接节点
 * @example
 * ```javascript
 * editor.queryCommandValue( 'link' );
 * ```
 */

/**
 * 取消超链接
 * @command unlink
 * @method execCommand
 * @param { String } cmd 命令字符串
 * @example
 * ```javascript
 * editor.execCommand( 'unlink');
 * ```
 */

UE.plugins["link"] = function() {
  function optimize(range) {
    var start = range.startContainer,
      end = range.endContainer;

    if ((start = domUtils.findParentByTagName(start, "a", true))) {
      range.setStartBefore(start);
    }
    if ((end = domUtils.findParentByTagName(end, "a", true))) {
      range.setEndAfter(end);
    }
  }

  UE.commands["unlink"] = {
    execCommand: function() {
      var range = this.selection.getRange(),
        bookmark;
      if (
        range.collapsed &&
        !domUtils.findParentByTagName(range.startContainer, "a", true)
      ) {
        return;
      }
      bookmark = range.createBookmark();
      optimize(range);
      range.removeInlineStyle("a").moveToBookmark(bookmark).select();
    },
    queryCommandState: function() {
      return !this.highlight && this.queryCommandValue("link") ? 0 : -1;
    }
  };
  function doLink(range, opt, me) {
    var rngClone = range.cloneRange(),
      link = me.queryCommandValue("link");
    optimize((range = range.adjustmentBoundary()));
    var start = range.startContainer;
    if (start.nodeType == 1 && link) {
      start = start.childNodes[range.startOffset];
      if (
        start &&
        start.nodeType == 1 &&
        start.tagName == "A" &&
        /^(?:https?|ftp|file)\s*:\s*\/\//.test(
          start[browser.ie ? "innerText" : "textContent"]
        )
      ) {
        start[browser.ie ? "innerText" : "textContent"] = utils.html(
          opt.textValue || opt.href
        );
      }
    }
    if (!rngClone.collapsed || link) {
      range.removeInlineStyle("a");
      rngClone = range.cloneRange();
    }

    if (rngClone.collapsed) {
      var a = range.document.createElement("a"),
        text = "";
      if (opt.textValue) {
        text = utils.html(opt.textValue);
        delete opt.textValue;
      } else {
        text = utils.html(opt.href);
      }
      domUtils.setAttributes(a, opt);
      start = domUtils.findParentByTagName(rngClone.startContainer, "a", true);
      if (start && domUtils.isInNodeEndBoundary(rngClone, start)) {
        range.setStartAfter(start).collapse(true);
      }
      a[browser.ie ? "innerText" : "textContent"] = text;
      range.insertNode(a).selectNode(a);
    } else {
      range.applyInlineStyle("a", opt);
    }
  }
  UE.commands["link"] = {
    execCommand: function(cmdName, opt) {
      var range;
      opt._href && (opt._href = utils.unhtml(opt._href, /[<">]/g));
      opt.href && (opt.href = utils.unhtml(opt.href, /[<">]/g));
      opt.textValue && (opt.textValue = utils.unhtml(opt.textValue, /[<">]/g));
      doLink((range = this.selection.getRange()), opt, this);
      //闭合都不加占位符，如果加了会在a后边多个占位符节点，导致a是图片背景组成的列表，出现空白问题
      range.collapse().select(true);
    },
    queryCommandValue: function() {
      var range = this.selection.getRange(),
        node;
      if (range.collapsed) {
        //                    node = this.selection.getStart();
        //在ie下getstart()取值偏上了
        node = range.startContainer;
        node = node.nodeType == 1 ? node : node.parentNode;

        if (
          node &&
          (node = domUtils.findParentByTagName(node, "a", true)) &&
          !domUtils.isInNodeEndBoundary(range, node)
        ) {
          return node;
        }
      } else {
        //trace:1111  如果是<p><a>xx</a></p> startContainer是p就会找不到a
        range.shrinkBoundary();
        var start = range.startContainer.nodeType == 3 ||
          !range.startContainer.childNodes[range.startOffset]
          ? range.startContainer
          : range.startContainer.childNodes[range.startOffset],
          end = range.endContainer.nodeType == 3 || range.endOffset == 0
            ? range.endContainer
            : range.endContainer.childNodes[range.endOffset - 1],
          common = range.getCommonAncestor();
        node = domUtils.findParentByTagName(common, "a", true);
        if (!node && common.nodeType == 1) {
          var as = common.getElementsByTagName("a"),
            ps,
            pe;

          for (var i = 0, ci; (ci = as[i++]); ) {
            (ps = domUtils.getPosition(ci, start)), (pe = domUtils.getPosition(
              ci,
              end
            ));
            if (
              (ps & domUtils.POSITION_FOLLOWING ||
                ps & domUtils.POSITION_CONTAINS) &&
              (pe & domUtils.POSITION_PRECEDING ||
                pe & domUtils.POSITION_CONTAINS)
            ) {
              node = ci;
              break;
            }
          }
        }
        return node;
      }
    },
    queryCommandState: function() {
      //判断如果是视频的话连接不可用
      //fix 853
      var img = this.selection.getRange().getClosedNode(),
        flag =
          img &&
          (img.className == "edui-faked-video" ||
            img.className.indexOf("edui-upload-video") != -1);
      return flag ? -1 : 0;
    }
  };
};