var xmlHttp = false;
	var metaengine = "";	

    function httpInit() {
		
		if (!xmlHttp){
		
	        if (window.XMLHttpRequest) { // Mozilla, Safari,...
	            xmlHttp = new XMLHttpRequest();
	            if (xmlHttp.overrideMimeType) {
	                xmlHttp.overrideMimeType('text/xml');                
	            }
	        } else if (window.ActiveXObject) { // IE
	            try {
	                xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
	            } catch (e) {
	                try {
	                    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	                } catch (e) {}
	            }
	        }
			
		}
		
        if (!xmlHttp) {
            alert('Cannot create an XMLHTTP instance');
            return false;
        }
    }
	
	function executeSearch(){		
		var searchForm = document.searchForm;
		var resultView = searchForm.view.value;
		var	lang = searchForm.lang.value;		
		var expression = searchForm.expression.value;        
		
        if (expression == ""){ 
			return false;
		}		

		if (searchForm.engine.length == null || searchForm.engine.length == 1 ){
			metaengine = searchForm.engine.value; 
		}else{
			for (i = 0; i < searchForm.engine.length; i++) {
				if (searchForm.engine[i].checked == true){
					metaengine = searchForm.engine[i].value; 
					break;
				}
			}
		}		
		
		if (metaengine === "metaiah"){
			expression = insertDefaultOperator(expression);
		}
		
		if (resultView == 'BOX'){
			// inicializing XMLHttpRequest
			httpInit();
	        var url = "../" + metaengine + "/searchAjax.php?expression=" + escape(expression) + "&lang=" + lang;

    	   	xmlHttp.open("POST", url, true);
        	xmlHttp.onreadystatechange = updatePage;
        
	   	    xmlHttp.send('');		
			return false;
		}else{
			searchForm.action = "../" + metaengine + "/search.php";
		}	
		return true;		
	}
	

    function updatePage(){
        var resultPortlet = document.getElementById("searchResult");
        var result = document.getElementById("result");
        var buffer = "";
		var message = "";
 	    var error = false;
        resultPortlet.style.display="block"; 

        result.innerHTML = "<div align='center'><img src='../image/common/loading.gif' border='0'></div>";

        if (xmlHttp.readyState == 4) {			
            if (xmlHttp.status == 200) {		
                var metaiah = xmlHttp.responseXML;  

                var groupList = metaiah.getElementsByTagName("result-group");
    		 
                for (var i = 0; i < groupList.length; i++) {                    
                    var group = groupList[i];
					sourceList =  group.childNodes;
					
					var sources = group.getAttribute("sources");					
				
                    buffer += "<ul>";
					if (sources == 1){		// caso tenha somente uma fonte no grupo
                        for (y = 0; y < sourceList.length; y++) {
                            var source = sourceList[y];
	                        if (source.nodeType == 1){                                
	                            if (source.getAttribute("error") != null){
                                    error = true;
                                    buffer += "<li>" + source.getAttribute("label") + " <span title='" + source.getAttribute("error") + "'>(!)</span></li>"; 
                                }else{
									browseUrl = encodeQuot( source.getAttribute("browse-url") );
                                    buffer += "<li><a href=\"" + browseUrl +  "\" target=\"metaResult\" onclick=\"openResultWin(this.href, this.target)\">" + source.getAttribute("label") + "</a> (" + source.getAttribute("total") + ") </li>"; 
                                }
                            }
                        } 			
					}else{
	                    buffer += " <li>" + group.getAttribute("label") + " (" + group.getAttribute("total") + ")";                        	                
                        for (y = 0; y < sourceList.length; y++) {
							buffer += "<ul>";
                            var source = sourceList[y];
							
                            if (source.nodeType == 1){
                                if (source.getAttribute("error") != null){
                                    error = true;									
                                    buffer += "<li>" + source.getAttribute("label") + " <span title='" + source.getAttribute("error") + "'>(!)</span></li>"; 
                                }else{									
									browseUrl = encodeQuot( source.getAttribute("browse-url") );
                                    buffer += "<li><a href=\"" + browseUrl +  "\" target=\"metaResult\" onclick=\"openResultWin(this.href, this.target)\">" + source.getAttribute("label") + "</a> (" + source.getAttribute("total") + ") </li>"; 
                                }    
                            }
							buffer += "</ul>";
                        }   				
                    }
                    buffer += " </li>";
                    buffer += "</ul>";
                }      
                if (error == true){
					if (lang == 'pt')
						message = "não foi possivel conectar";
					if (lang == 'es')
					 	message = "no fue posible conectar";
					if (lang == 'en')
						message = "unable to connect";		
					
					buffer += "<div style='text-align:right; font-size: 90%'>(!)" + message + "</div>";						
      	        }                   
            } else {
                buffer = xmlHttp.responseText;
            }
			
			buffer += "<div align='right'><img src='../image/common/engine/" + metaengine + "/logo.gif' border='0'></div>";
            result.innerHTML = buffer;
        }

    }

    function portletClose(portletId){
		xmlHttp.abort();
        var portlet = document.getElementById(portletId);
        portlet.style.display = "none";

        return;
    }

    function insertDefaultOperator(str){

	
		var quotedExpressions = str.match(/("[^"]*")/g);
	
		// Substitui expressões dentro de aspas por %~~%
		if (quotedExpressions)
		{
			for (var i = 0; i < quotedExpressions.length; i++)
			{
				var qexp = quotedExpressions[i];
				var pos = str.indexOf(qexp);
				
				str = str.slice(0, pos) + "\%~~\%" + str.slice(pos + qexp.length);
			}	
		}
		
		var patterns = [ /^\s+/, /\s+$/, /\s+/g, / AND (AND|OR|NOT) AND /ig, /^NOT AND /i, / NOT AND /ig, / AND /g, / OR /g, /^NOT /, / NOT /g ];
		var replacements = [ "", "", " and ", " $1 ", "not ", " not ", " and ", " or ", "not ", " not " ];
	
		for (var i = 0; i < patterns.length; i++)
		{
			str = str.replace(patterns[i], replacements[i]);
		}	
		
		// Insere de volta a expressão dentro de aspas
		if (quotedExpressions)
		{
			for (var i = 0; i < quotedExpressions.length; i++)
			{
				str = str.replace(/%~~%/, quotedExpressions[i]);
			}	
		}
		
		return str;
    }

	function openResultWin(url, target){
 		 newWindow = window.open(url, target);
	     if(newWindow.focus) newWindow.focus();
	}

	function encodeQuot(str) {
		str=str.replace(/"/g,'%22');
		return str;
	}