/**
* 对 textarea 的操作
* 现有 bbcode 插入功能
* 修改 prompt 为 popup 样式　
* @author Kafeifei <kafeifei@gmail.com> chenqian <yesterday@gmail.com>
*
* $Id: bbcode.js 20737 2009-07-23 10:45:08Z apollopy $
*/
function VC_textarea(textarea_id) {

    /**
    * 构造函数, 给定文本输入框id, 返回事例
    *
    * @param String textarea_id
    * @return VC_textarea
    */
    this.__construct = function (textarea_id){
        this.textareaId = textarea_id;
        this.textarea = $(textarea_id);
        if (!this.textarea){
            alert('not found '+this.textareaId);
        }
    }
    this.__construct(textarea_id);
    var alwaysthis=this;

	var _dialogPromptID = null;
	var _blackoutPromptID = null;
	var _isIE7;
	var _ieCurPos=0;
	var _selCopy;
	var _isSelect;
	this.ieprompt=function(innertxt, def, cb) {
	    //_isIE7 = navigator.userAgent.indexOf("MSIE 7") > 0;
		that=this;
		_isIE7=true;
	    this.wrapupPrompt = (function(cancled) {
	        if (_isIE7) {
	            val = $("iepromptfield").value;
	            _dialogPromptID.style.display = "none";
	            _blackoutPromptID.style.display = "none";
	            $("iepromptfield").value = "";
	            if (cancled) {
	                val = "";
	            }
	            //cb(val);
	        }
	        return false;
	    });
	    if (def == undefined) {
	        def = "";
	    }
	    if (_isIE7) {
	        if (_dialogPromptID == null) {
	            var tbody = document.getElementsByTagName("body")[0];
	            tnode = document.createElement("div");
	            tnode.id = "IEPromptBox";
	            tbody.appendChild(tnode);
	            _dialogPromptID = $("IEPromptBox");
	            tnode = document.createElement("div");
	            tnode.id = "promptBlackout";
	            tbody.appendChild(tnode);
	            _blackoutPromptID = $("promptBlackout");
	            _blackoutPromptID.style.opacity = ".9";
	            _blackoutPromptID.style.position = "absolute";
	            _blackoutPromptID.style.top = "0px";
	            _blackoutPromptID.style.left = "0px";
	            _blackoutPromptID.style.backgroundColor = "#999";
	            _blackoutPromptID.style.filter = "alpha(opacity=90)";
	            _blackoutPromptID.style.height = (document.body.offsetHeight < screen.height) ? screen.height + "px": document.body.offsetHeight + 20 + "px";
	            _blackoutPromptID.style.display = "block";
	            _blackoutPromptID.style.zIndex = "50";
	            //_dialogPromptID.style.border = "2px solid #B22222";
	            _dialogPromptID.style.backgroundColor = "#DDDDDD";
	            _dialogPromptID.style.position = "absolute";
	            _dialogPromptID.style.width = "330px";
	            _dialogPromptID.style.zIndex = "810";
				_blackoutPromptID.onclick=function(){
		 	 	_dialogPromptID.style.display = "none";
	            _blackoutPromptID.style.display = "none";
	            $("iepromptfield").value = "";
			}

	        }
	        var tmp = "<div style=\"width: 100%; background:#B22222 url(http://statics.verycd.com/images/base/redbg.jpg); color: white;font-weight: bold; height: 24px\">" + innertxt + "</div>";
			tmp += "<div style=\"padding: 10px\">";
		    //tmp += "<form action=\"\" onsubmit=\"return that.wrapupPrompt()\">";
		    tmp += "<textarea id=\"iepromptfield\" style=\"width:300px;height:60px\" name=\"iepromptdata\" type=\"text\" size=\"40\" value=\"" + def + "\"></textarea>";
		    tmp += "<br /><br />";
			tmp += "<input type=\"submit\" id=\"sure\" value=\"确定\">";
	        tmp += "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
	        tmp += "<input type=\"button\" onclick=\"that.wrapupPrompt(true)\" value=\"取消\">";
	        tmp += "</div>";
	        _blackoutPromptID.style.height = (document.body.offsetHeight < screen.height) ? screen.height + "px": document.body.offsetHeight + 30 + "px";
	        _blackoutPromptID.style.width = "100%";
	        _blackoutPromptID.style.display = "block";
	        _dialogPromptID.innerHTML = tmp;
	        _dialogPromptID.style.top = parseInt(document.documentElement.scrollTop + (screen.height / 4)) + "px";
	        _dialogPromptID.style.left = parseInt((document.body.offsetWidth - 315) / 2) + "px";
	        _dialogPromptID.style.display = "block";
	        $("iepromptfield").focus();
	    } else {
	        return prompt(innertxt, def);
	    }
	}



	/**
	* 判断是否有文字被选取
	*
	* @return Boolean | String
	*/
	this.getSelectionContents = function() {
		if (document.selection) { // ie
			this.textarea.focus();
			var v = document.selection.createRange();
			if (!v.text) {
				return false;
			} else {
				return v.text;
			}
		} else if (this.textarea.selectionStart || this.textarea.selectionStart == "0") { // mozilla
			var v = this.textarea.value.substring(this.textarea.selectionStart, this.textarea.selectionEnd);
			if (!v) {
				return false;
			} else {
				return v;
			}
		}
		// other
		return false;
	}

	/**
	* 光标位置插入内容或替换掉已选中的内容
	*
	* @param String str
	* @return void
	*/
    this.insertText = function(str) {
        var view = this.textarea;
        if (!str) str = '';
        if (document.selection) { // ie
			this.textarea.focus();
            //v.select();
		    var v = document.selection.createRange();
	        v.text = "";
			// 有选择内容时使用此方法
	        if(_isSelect != undefined) {
				var _selCopy=v.duplicate()
				_selCopy.text = str;
        	}else{
	      		// 没有选择内容时使用此方法
				view.focus();
			   	var endPos=_ieCurPos+str.length;
			   	view.value=view.value.substring(0,_ieCurPos)+str+view.value.substring(_ieCurPos,view.value.length);
				var range = view.createTextRange();
				range.collapse(true);
				range.moveEnd('character', _ieCurPos+str.length/2);
				range.moveStart('character', _ieCurPos+str.length/2);
				range.select();
			}

        }
        else if (this.textarea.selectionStart || this.textarea.selectionStart == "0") { // mozilla
            var startPos = this.textarea.selectionStart;
        	var endPos = this.textarea.selectionEnd;
        	var cursorPos = endPos;
        	var scrollTop = this.textarea.scrollTop;

            this.textarea.value = this.textarea.value.substring(0, startPos) + str + this.textarea.value.substring(endPos, this.textarea.value.length);

            var tpp = str.length + startPos;
            this.textarea.focus();
            this.textarea.selectionStart = tpp;
            this.textarea.selectionEnd   = tpp;
            this.textarea.scrollTop = scrollTop;
        } else { // other
            this.textarea.value += str;
        }
    }

    /**
    * 插入bbcode, 如果lang为数组，则为双参数
    *
    * @param String tag
    * @param String | Array lang
    * @return Boolean
    */
    this.addBbcode = function(tag, lang) {
        var bbcode, input_str;
        var selection_contents = this.getSelectionContents();
		// 如果有选择内容
		_isSelect=selection_contents||undefined;
		// 增加对 IE 的判断，因为焦点会切换
		if(document.selection){
			 var c		= "\001";
			 var sel	= document.selection.createRange();
			 var txt	= sel.text;
			 _selCopy	= sel.duplicate();
			 try{ _selCopy.moveToElementText(this.textarea); }catch(e) { return 0}
			 sel.text	= txt + c;
			 _ieCurPos = (_selCopy.text.indexOf(c));
			 sel.moveStart('character',-1);
			 sel.text	= "";
		}
        if (selection_contents) {
            switch (tag) {
                case 'url':
	                if (false == bbcode) return false;
	                bbcode = this.addBbcode_Url(tag, lang);
					//$(textarea_id).value = bbcode;
                break;
                case 'flash':
                    bbcode = this.addBbcode_flash(tag, lang);
                    if(bbcode) {
                        this.insertText(bbcode)
                    }
                break;
                default:
                    bbcode = '['+tag+']'+selection_contents+'[/'+tag+']';
					this.insertText(bbcode)
                break;
            }
        } else if (typeof lang == 'string') {
            // 单一参+数 <- ie傻B
            if(tag == 'flash') {
                bbcode = this.addBbcode_flash(tag, lang);
            } else {
				var iepr = this.ieprompt(lang, '')
				if($('sure')){
					$('sure').onclick=function(){
						_dialogPromptID.style.display = "none";
			            _blackoutPromptID.style.display = "none";
						bbcode = '['+tag+']'+$("iepromptfield").value+'[/'+tag+']';
						if($("iepromptfield").value){
							alwaysthis.insertText(bbcode);
						 }
						$("iepromptfield").value = "";
				 }
            }
			}
        } else {
            // 多(二)参+数 <- ie傻B
        	var iepr = this.ieprompt(lang[0], '')
			$('sure').onclick = function() {
			    //_dialogPromptID.style.display = "none";
			    //_blackoutPromptID.style.display = "none";
			    //bbcode = '['+tag+']'+$("iepromptfield").value+'[/'+tag+']';

			    if ($("iepromptfield").value) {
			    	bbcode = '[' + tag + '=' + $("iepromptfield").value + ']';
			        var iepr = alwaysthis.ieprompt(lang[1], '')
			        if ($('sure')) {
			            $('sure').onclick = function() {
			                if ($("iepromptfield").value) {
						        _dialogPromptID.style.display = "none";
				                _blackoutPromptID.style.display = "none";
			            		bbcode += $("iepromptfield").value + '[/' + tag + ']';
			                    alwaysthis.insertText(bbcode)
			                }else return false;
			            }
			        }
			    } else {
			        return false;        // 任何一步失败返回false
			    }

			}

        }


        return true;
    }

    this.addBbcode_Url = function(tag, lang) {
        var bbcode, input_str;
        var selection_contents = this.getSelectionContents();
        if (selection_contents) {
            if (selection_contents.match(/(^|\s|&nbsp|^\])(http|https|ftp|mms|telnet|rtsp|ed2k)(:\/\/\S+)/gi)) {
               	 var iepr = this.ieprompt(lang[1], '')
					if($('sure')){
						$('sure').onclick=function(){
							_dialogPromptID.style.display = "none";
				            _blackoutPromptID.style.display = "none";
							 bbcode = '['+tag+'='+selection_contents+']'+$("iepromptfield").value+'[/'+tag+']';
							if($("iepromptfield").value)alwaysthis.insertText(bbcode); // 插入bbcode
							$("iepromptfield").value = "";
					 }
                } else {
                    return false;
                }
            } else {
                 var iepr = this.ieprompt(lang[0], '')
					if($('sure')){
						$('sure').onclick=function(){
							_dialogPromptID.style.display = "none";
				            _blackoutPromptID.style.display = "none";
						    bbcode = '['+tag+'='+$("iepromptfield").value+']'+selection_contents+'[/'+tag+']';
						  if($("iepromptfield").value)alwaysthis.insertText(bbcode); // 插入bbcode
							$("iepromptfield").value = "";
					 }
                } else {
                    return false;
                }
            }
        }
        return bbcode;
    }

    /**
    * 自动识别 url 连接，转换为url bbcode
    */
    this.autoUrl = function () {
        this.textarea.value = this.textarea.value.replace(/(^|\s|&nbsp|^\])([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})/gi, '$1[email]$2[email]');
        this.textarea.value = this.textarea.value.replace(/(^|\s|&nbsp|^\])(http|https|ftp|mms|telnet|rtsp|ed2k)(:\/\/\S+)/gi, '$1[url]$2$3[/url]');
        this.textarea.value = this.textarea.value.replace(/(^|\s|&nbsp|^\])(([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3}[\/\S]*)/gi, '$1[url=http://$2]$2[/url]');
        this.textarea.value = this.textarea.value.replace(/\[url\](\S+.(gif|jpg|png|bmp))\[\/url\]/gi, '[img]$1[/img]');
        this.textarea.value = this.textarea.value.replace(/\[url\](ed2k:\/\/\S+)\[\/url\]/gi, '[emule]$1[/emule]');

        //str = str.replace(/\[url\](\S+.swf)\[\/url\]/gi, '[flash]$1[/flash]');
        //return ;
    }

    /**
    * flash bbcode代码
    **/
    this.addBbcode_flash = function(tag, lang) {
        var bbcode, input_str, src;
        var width;
        var height;
        var selection_contents = this.getSelectionContents();
		var pattern = /(\w+)=['"](.*?)['"]/g;
        if (selection_contents) {
			if(selection_contents.match(/(tudou|youku).com/g) == null) {
                alert("VeryCD目前仅支持优酷、土豆视频转帖。");
                return false;
			}
            while((result = pattern.exec(selection_contents)) != null) {
                switch(result[1]) {
                    case "src":
                    src = result[2];
                    break;
                    case "width":
                    width = result[2];
                    break;
                    case "height":
                    height = result[2];
                    break;
                }
    		}
    		if(src == 'undefined' || src == null) {  //如果src获取不到值
                src = selection_contents;
    		}
    		if(width == 'undefined' || width == null) {
                if(selection_contents.indexOf("youku") > -1) {
                    width = 480;
                } else if(selection_contents.indexOf("tudou") > -1) {
                    width = 420;
                } else {
                    width = 480;
                }
    		}
    		if(height == 'undefined' || height == null) {
                if(selection_contents.indexOf("youku") > -1) {
                    height = 400;
                } else if(selection_contents.indexOf("tudou") > -1) {
                    height = 363;
                } else {
                    height = 400;
                }
    		}
    		bbcode = '[flash=' + width + ',' + height + ']' + src + '[/flash]';
        } else {
			var iepr = this.ieprompt(lang, '')
			if($('sure')){
				$('sure').onclick=function(){
				    var value = $("iepromptfield").value;
					if(value.match(/(tudou|youku).com/g) == null) {
                        alert("VeryCD目前仅支持优酷、土豆视频转帖。");
                        return false;
					}
				    _dialogPromptID.style.display = "none";
		            _blackoutPromptID.style.display = "none";
	                while((result = pattern.exec(value)) != null) {
	                    switch(result[1]) {
                            case "src":
                            src = result[2];
                            break;
                            case "width":
                            width = result[2];
                            break;
                            case "height":
                            height = result[2];
                            break;
                        }
            		}
            		if(src == 'undefined' || src == null) {  //如果src获取不到值
                        src = value;
            		}
            		if(width == 'undefined' || width == null) {
                        if(value.indexOf("youku") > -1) {
                            width = 480;
                        } else if(value.indexOf("tudou") > -1) {
                            width = 420;
                        }
            		}
            		if(height == 'undefined' || height == null) {
                        if(value.indexOf("youku") > -1) {
                            height = 400;
                        } else if(value.indexOf("tudou") > -1) {
                            height = 363;
                        }
            		}
					bbcode = '[flash=' + width + ',' + height + ']' + src + '[/flash]';
					if(value){
						alwaysthis.insertText(bbcode);
					 }
					$("iepromptfield").value = "";
			    }
            }
        }
        return bbcode;
    }
}