/*
● 作者：Sean Lin (http://sean.o4u.com)

● 程式功能：讓 blogger.com 張貼的「意見」可以有「作者回覆」。

● 安裝方法：

  在「<b:includable id='comments' var='post'>」下一行加入:
  
  <b:if cond='data:post.allowComments'>
    <script src='http://www.google.com/jsapi' type='text/javascript'/>
    <script charset='UTF-8' src='http://這個檔案存放的網址/ar.js' type='text/javascript'/>
    <script type='text/javascript'>var PostAuthor=&#39;<data:post.author/>&#39;;</script>
  </b:if>
  
*/

if(document.location.href.indexOf('http://sean.o4u.com/')!=0)
  alert('為防止 JavaScript 盜連，請修改上下這兩行。刪掉或修改，並放到自己的網站空間。');


google.setOnLoadCallback(initializeAuthorReply);

function initializeAuthorReply() {
  
  var h4Tags = document.getElementById("comments").getElementsByTagName("H4");
  
  var aTags = document.getElementById("comments").getElementsByTagName("A");
  var addCommentUrl = '';

  //找出「張貼意見」的連結
  if(document.getElementById('comment-editor-src')) {
    addCommentUrl = document.getElementById('comment-editor-src').href.replace(/-iframe/,'');
  }
  else {
    for (i=0; i<aTags.length; i++)
      if( aTags[i].href.indexOf('/comment.g?') > 0)
        addCommentUrl = aTags[i].href;
  }

  var reCommentUser = /\s*(.+)\s+?(?:提到|said)/i;
  var reReply = /^\s?<p[^>]*>\s?Re:\s*(.+?)\s*&lt;(\d+)&gt;<br\/?>((?:.|\n)+)<\/p>\s?$/i; 
  var rePostID = /postID=(\d+)/;
  var commentID = '';
  var commentUser = '';
  var elCommentAuthor, elCommentBody, elCommentFooter, replyURL;
  var CommentFooters = new Object();

  var reCount = 0;

  for (i=0; i<aTags.length; i++) {
    if( aTags[i].href.indexOf('/delete-comment.g?') > 0) { //在「刪除意見」連結上找 意見ID
      commentID = rePostID.test(aTags[i].href)?RegExp.$1:'';
      elCommentAuthor = document.getElementById('c'+commentID);
      elCommentBody = nextElement(elCommentAuthor);
      elCommentFooter = nextElement(elCommentBody);
      CommentFooters['c'+commentID] = elCommentFooter;
      commentUser = reCommentUser.test(elCommentAuthor.innerText)?RegExp.$1:''; //抽出留意見人名

      if( commentUser == PostAuthor && reReply.test(elCommentBody.innerHTML)){

          replyID = RegExp.$2;
          replyMsg = RegExp.$3;
          
          if(CommentFooters['c'+replyID]) {
            CommentFooters['c'+replyID].innerHTML += '<hr noshade size="1" color="#e0e0e0" /><div align="left" style="background-color: lightyellow; padding: 4px">●<b style="color: blue">作者回覆</b>：'+replyMsg+'<br/><div align="right" style="font-size:8pt; color:darkgray">'+elCommentFooter.innerText+'</div></div>';
            elCommentAuthor.style.display = 'none';
            elCommentBody.style.display = 'none';
            elCommentFooter.style.display = 'none';
          }
      }
      else {
        reCount++;
      }
      replyURL = '<a href="'+addCommentUrl+'&postBody=Re%3A%20'+encodeURIComponent(commentUser)+'%20%3C'+commentID+'%3E%0D%0A'+'" style="font: 9pt Arial; color:#8a8a8a" title="回覆意見">回</a>';
      afterEndHtml(aTags[i],replyURL);
    }
  }
  h4Tags[0].innerHTML = h4Tags[0].innerHTML.replace(/\d+/, reCount); //修正回覆數
}

function replyEmbedComment(CN,CID) { 
  var url = 
  url += "&postBody=Re:+"+encodeURIComponent(CN)+"+<"+CID+">";
  location.href = url; 
} 


// IE FF 相容式
function afterEndHtml(el, html){
  if(el.insertAdjacentHTML){
      el.insertAdjacentHTML('AfterEnd', html);
      return el.nextSibling;
  }

  var range = el.ownerDocument.createRange();
  range.setStartAfter(el);

  var frag = range.createContextualFragment(html);
  el.parentNode.insertBefore(frag, el.nextSibling);
  return el.nextSibling;
}

// IE FF 相容
function nextElement(el) {
  return(el.nextElementSibling?el.nextElementSibling:el.nextSibling);
}

// 讓 FF 有 innerText 功能
if(window.navigator.userAgent.toLowerCase().indexOf("msie")<0){ 
  HTMLElement.prototype.__defineGetter__("innerText", 
    function(){
      var anyString = "";
      var childS = this.childNodes;
      for(var i=0; i<childS.length; i++) { 
        if(childS[i].nodeType==1)
          //anyString += childS[i].tagName=="BR" ? "\n" : childS[i].innerText;
          anyString += childS[i].innerText;
        else if(childS[i].nodeType==3)
          anyString += childS[i].nodeValue;
      }
      return anyString;
    } 
  ); 
  HTMLElement.prototype.__defineSetter__("innerText", 
    function(sText){
      this.textContent=sText; 
    } 
  ); 
}