var OOSMessage = "Sorry, there was a synchronization problem.\nWe have updated the page with the latest infromation we have.\nPlease re-do your last action.";
var SessionTimeOutMessage = "Your session may have timed out and all of your data has been lost.  By registering and logging in you can prevent this from happening in the future.";
function ErrorHandler(evt, data, strategy, qform, name, fromHist){
	var type = null;
	
	if(evt == "Results") {
            if (data.substring(0,1) != "{") return true;
            data = eval("(" + data + ")");
			for(var v in data.state){
				if(data.state[v].id == strategy.backId)
					break;
			}
			loadModel(data.strategies[data.state[v].checksum], v);
			x = new Object();
			x.strategy = undefined;
			x.step = undefined;
			showStrategies(x);
			return;
	}
        if(data.type == "success"){
		return true;
	}else{
		type = data.type;
		if(type == "param-error"){ //Error is in the parameter list
			table = document.createElement('table');
			$(table).addClass("parameter-errors").html("<tr><td colspan=2>"+data.message+"</td></tr>");
			params = data.params;
			for(p in params){
				if(p != "length"){
					tr = document.createElement('tr');
					tdPrompt = document.createElement('td');
					tdMessage = document.createElement('td');
					$(tdPrompt).html(params[p].prompt + ": ");
					$(tdMessage).html(params[p].message);
					$(tr).append(tdPrompt).append(tdMessage);
					$(table).append(tr);
				}
			}
			$("form",qform).prepend(table);
			$(qform).show();
		}else if(type == "out-of-sync"){ //Checksum sent did not match the back-end checksum
			if(data.state.length == 0)
				alert(SessionTimeOutMessage);
			else
				alert(OOSMessage);
			removeStrategyDivs(strategy.backId);
			f_strategyId = updateStrategies(data, evt, strategy);
			removeLoading(strategy.frontId);
			$("#diagram_" + strategy.frontId + " div.venn:last .resultCount a").click();
			isInsert = "";
		}else if(type == "dup-name-error"){
			if(evt == "SaveStrategy"){
				var overwrite = confirm("A strategy already exists with the name '" + name + ".' Do you want to overwrite the existing strategy?");
				if (overwrite) {
					saveOrRenameStrategy(strategy.backId, false, true, fromHist);
				}
			}else if(evt == "RenameStrategy"){
				alert("An unsaved strategy already exists with the name '" + name + ".'");
				if (strategy.isSaved)  $("input[name='name']",qform).attr("value", strategy.savedName);
			}
		}else{ //Gerenal Error Catcher
			alert(data.message);
			//TODO : Add a AJAX call to send an e-mail to Admininstrator with exception, stacktrace and message
			initDisplay(0);
		}
	}
}

function ValidateView(strategies){
	var failed = new Array();
	for(str in strats){
		strat = strats[str];
		if(strat.checksum != strategies[strat.backId])
			failed.push(strat.frontId);
	}
	if(failed.length == 0)
		return true;
	else
		return failed;
}