var Utilities = {
	getText: function(text){
		var lang = Langs[language];
		var returnText = lang[text];
		return returnText;
	},
	getImage: function(image){
		var agentPics = Agents[userAgent];
		var returnImage = agentPics[image];
		return returnImage;
	},
	getScreenWidth: function(){
		var width = Constants.screenSizes[userAgent].width;
		return width;
	},
	getScreenHeight: function(){
		var height = Constants.screenSizes[userAgent].height;
		return height;
	},
	haveObject: function(){
		for (val in mainData.objects){
			if (mainData.objects[val] && mainData.objects[val].had == true){
				return true;
			}
		}
		return false;
	},
	haveQuests: function(){
		for (val in mainData.quests){
			if (mainData.quests[val] && mainData.quests[val].status == "had" || mainData.quests[val].status == "done"){
				return true;
			}
		}
		return false;
	},
	haveEvents: function(){
		for (val in mainData.events){
			if (mainData.events[val] && mainData.events[val].happened == true){
				return true;
			}
		}
		return false;
	},
	isPrecondValid: function(preCond){
		if (preCond == true){
			return true;
		}
		var precondArray = preCond.split("&");
		var resArray = new Array();
		for (val in precondArray){
			resArray.push(Utilities.checkSinglePrecond(precondArray[val]));
		}
		var result = true;
		for (val in resArray){
			result = result && resArray[val];
		}
		return result;
	},
	checkSinglePrecond: function(singlePrecond){
		if (singlePrecond.indexOf("quest") == 0){
			return Utilities.checkQuestPreCond(singlePrecond.replace("quest(", ""));
		}else if (singlePrecond.indexOf("oggetto") == 0){
			return Utilities.checkOggettoPreCond(singlePrecond.replace("oggetto(", ""));
		}else if (singlePrecond.indexOf("evento") == 0){
			return Utilities.checkEventoPreCond(singlePrecond.replace("evento(", ""));
		}
	},
	checkQuestPreCond: function(precond){
		//alert("checko Quest " + precond);
		var precondQue = precond.split(",")[0];
		var precondWould = precond.split(",")[1] == "done)" ? "done" : precond.split(",")[1] == "had)" ? "had" : "none";
		var result = true;
		if (mainData && mainData.quests && mainData.quests[precondQue]){
			var quest = mainData.quests[precondQue];
			if (quest.status == precondWould){
				result = true;
			}else{
				result = false;
			}
		}
		return result;
	},
	checkOggettoPreCond: function(precond){
		//alert("checko Oggetto " + precond);
		var precondObj = precond.split(",")[0];
		var precondWould = precond.split(",")[1] == "true)" ? true : false;
		var result = true;
		//alert(mainData.objects + "-" + precondObj);
		if (mainData && mainData.objects && mainData.objects[precondObj]){
			var obj = mainData.objects[precondObj];
			//alert(JSON.stringify(obj));
			if (obj.had == precondWould){
				result = true;
			}else{
				result = false;
			}
		}
		//alert(result);
		return result;
	},
	checkEventoPreCond: function(precond){
		//alert("checko Evento " + precond);
		var precondEve = precond.split(",")[0];
		var precondWould = precond.split(",")[1] == "true)" ? true : false;
		var result = true;
		if (mainData && mainData.events && mainData.events[precondEve]){
			var event = mainData.events[precondEve];
			if (event.happened == precondWould){
				result = true;
			}else{
				result = false;
			}
		}
		return result;
	},
	setPostCond: function(postCond){
		if (postCond == true){
			return;
		}
		var postCondArray = postCond.split("&");
		for (val in postCondArray){
			Utilities.setSinglePostCond(postCondArray[val]);
		}
		return;
	},
	setSinglePostCond: function(singlePostCond){
		if (singlePostCond.indexOf("quest") == 0){
			Utilities.setQuestPostCond(singlePostCond.replace("quest(", ""));
		}else if (singlePostCond.indexOf("oggetto") == 0){
			Utilities.setOggettoPostCond(singlePostCond.replace("oggetto(", ""));
		}else if (singlePostCond.indexOf("evento") == 0){
			Utilities.setEventoPostCond(singlePostCond.replace("evento(", ""));
		}
	},
	setQuestPostCond: function(postcond){
		var postcondQue = postcond.split(",")[0];
		var postcondWould = postcond.split(",")[1] == "done)" ? "done" : postcond.split(",")[1] == "had)" ? "had" : "none";
		if (mainData && mainData.quests && mainData.quests[postcondQue]){
			var quest = mainData.quests[postcondQue];
			if (postcondWould == "had" && quest.status != postcondWould){
				Utilities.mostraAlert(quest.hadTitle, quest.hadText, quest, "quest");
			}else if (postcondWould == "done" && quest.status != postcondWould){
				Utilities.mostraAlert(quest.doneTitle, quest.doneText, quest, "quest");
			}
			quest.status = postcondWould;
		}
		return;
	},
	setOggettoPostCond: function(postcond){
		var postcondObj = postcond.split(",")[0];
		var postcondWould = postcond.split(",")[1] == "true)" ? true : false;
		if (mainData && mainData.objects && mainData.objects[postcondObj]){
			var obj = mainData.objects[postcondObj];
			if (postcondWould && obj.had != postcondWould){
				Utilities.mostraAlert(obj.trueTitle, obj.trueText, obj, "object");
			}else if (obj.had != postcondWould){
				Utilities.mostraAlert(obj.falseTitle, obj.falseText, obj, "object");
			}
			obj.had = postcondWould;
		}
		return;
	},
	setEventoPostCond: function(postcond){
		var postcondEve = postcond.split(",")[0];
		var postcondWould = postcond.split(",")[1] == "true)" ? true : false;
		if (mainData && mainData.events && mainData.events[postcondEve]){
			var event = mainData.events[postcondEve];
			if (postcondWould && event.happened != postcondWould){
				Utilities.mostraAlert(event.trueTitle, event.trueText, event, "event");
			}else if (event.happened != postcondWould){
				Utilities.mostraAlert(event.falseTitle, event.falseText, event, "event");
			}
			event.happened = postcondWould;
		}
		return;
	},
	mostraAlert: function(title, text, obj, type){
		var container = document.getElementById("alertBox");
		var alertWidth = parseInt(Utilities.getScreenWidth()*mainData.alert.widthPerc);
		var alertHeight = parseInt(Utilities.getScreenHeight()*mainData.alert.heightPerc);
		var alertLeftPos = parseInt((Utilities.getScreenWidth() - alertWidth)/2);
		var alertTopPos = parseInt((Utilities.getScreenHeight() - alertHeight)/2);
		container.style.width = ""+ alertWidth + "px";
		container.style.height = ""+ alertHeight + "px";
		container.style.top = alertTopPos + "px";
		container.style.left = alertLeftPos + "px";
		container.style.backgroundColor = mainData.alert["alert-background-color"];
		container.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["alert-background-img"]) + ')';
		container.style.display = "block";
		
		var blocker = document.getElementById("alertBlocker");
		blocker.style.width = ""+ Utilities.getScreenWidth() + "px";
		blocker.style.height = ""+ Utilities.getScreenHeight() + "px";
		blocker.style.top = "0px";
		blocker.style.left = "0px";
		blocker.style.display = "block";
		
		var leftBorderContainer = document.getElementById("alertWBorderLeft");
		leftBorderContainer.style.top = alertTopPos + "px";
		leftBorderContainer.style.left = alertLeftPos + "px";
		leftBorderContainer.style.width = ""+ mainData.alert["wBorder-width"] + "px";
		leftBorderContainer.style.height = ""+ alertHeight + "px";
		leftBorderContainer.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["wBorderLeft-img"]) + ')';
		leftBorderContainer.style.display = "block";
		
		var rightBorderContainer = document.getElementById("alertWBorderRight");
		rightBorderContainer.style.top = alertTopPos + "px";
		rightBorderContainer.style.left = (alertLeftPos + alertWidth - mainData.alert["wBorder-width"]) + "px";
		rightBorderContainer.style.width = ""+ mainData.alert["wBorder-width"] + "px";
		rightBorderContainer.style.height = ""+ alertHeight + "px";
		rightBorderContainer.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["wBorderRight-img"]) + ')';
		rightBorderContainer.style.display = "block";
		
		var topBorderContainer = document.getElementById("alertHBorderTop");
		topBorderContainer.style.top = alertTopPos + "px";
		topBorderContainer.style.left = alertLeftPos + "px";
		topBorderContainer.style.width = ""+ alertWidth + "px";
		topBorderContainer.style.height = ""+ mainData.alert["hBorder-height"] + "px";
		topBorderContainer.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["hBorderTop-img"]) + ')';
		topBorderContainer.style.display = "block";
		
		var bottomBorderContainer = document.getElementById("alertHBorderBottom");
		bottomBorderContainer.style.top = (alertTopPos +alertHeight - mainData.alert["hBorder-height"]) +"px";
		bottomBorderContainer.style.left = alertLeftPos + "px";
		bottomBorderContainer.style.width = ""+ alertWidth + "px";
		bottomBorderContainer.style.height = ""+ mainData.alert["hBorder-height"] + "px";
		bottomBorderContainer.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["hBorderBottom-img"]) + ')';
		bottomBorderContainer.style.display = "block";
		
		var alertTitle = document.getElementById("alertTitle");
		alertTitle.innerHTML = title;
		alertTitle.style.top = (alertTopPos + mainData.alert["hBorder-height"] + 10 )+ "px";
		alertTitle.style.left = (alertLeftPos + mainData.alert["wBorder-width"] + 10 )+ "px";
		alertTitle.style.width = ""+ (alertWidth - 2* mainData.alert["wBorder-width"] - 20 )+ "px";
		alertTitle.style.height = ""+ 30 + "px";
		alertTitle.style.display = "block";
		
		var alertText = document.getElementById("alertText");
		alertText.innerHTML = text;
		alertText.style.top = (alertTopPos + mainData.alert["hBorder-height"] + 40 )+ "px";
		alertText.style.left = (alertLeftPos + mainData.alert["wBorder-width"] + 10 )+ "px";
		alertText.style.width = ""+ (alertWidth - 2* mainData.alert["wBorder-width"] - 20 )+ "px";
		alertText.style.height = "auto";
		alertText.style.display = "block";
		
		var alertImg = document.getElementById("alertImg");
		alertImg.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(obj["img"]) + ')';
		alertImg.style.top = (alertTopPos + alertHeight - mainData.defaults[type + "-height"] - 50 - mainData.alert["alert-OKButton-height"])+ "px";
		alertImg.style.left = (alertLeftPos + mainData.alert["wBorder-width"] + 10 )+ "px";
		alertImg.style.width = ""+ (mainData.defaults[type+"-width"])+ "px";
		alertImg.style.height = ""+ (mainData.defaults[type + "-height"])+ "px";
		alertImg.style.display = "block";						
								
		var alertImgText = document.getElementById("alertImgText");
		alertImgText.innerHTML = Utilities.getText(obj["description"]);
		alertImgText.style.top = (alertTopPos + alertHeight - mainData.defaults[type + "-height"] - 50 - mainData.alert["alert-OKButton-height"])+ "px";
		alertImgText.style.left = (alertLeftPos + mainData.alert["wBorder-width"] + 20 + mainData.defaults[type+"-width"])+ "px";
		alertImgText.style.width = ""+ (alertWidth - 30 - (2 * mainData.alert["wBorder-width"]) - mainData.defaults[type+"-width"])+ "px";
		alertImgText.style.height = "auto";
		alertImgText.style.display = "block";						
		
		var alertOKButton = document.getElementById("alertOKButton");
		alertOKButton.style.backgroundImage = 'url(' + "./images/"+
								Utilities.getImage(mainData.alert["alert-OKButton-img"]) + ')';
		alertOKButton.style.top = (alertTopPos + alertHeight - 20 - mainData.alert["alert-OKButton-height"])+ "px";
		alertOKButton.style.left = (alertLeftPos + parseInt((alertWidth - mainData.alert["alert-OKButton-width"])/2))+ "px";
		alertOKButton.style.width = ""+ mainData.alert["alert-OKButton-width"]+ "px";
		alertOKButton.style.height = ""+ mainData.alert["alert-OKButton-height"]+ "px";
		alertOKButton.style.display = "block";												
		
	},
	nascondiAlert: function(){
		document.getElementById("alertBlocker").style.display = "none";
		document.getElementById("alertBox").style.display = "none";
		document.getElementById("alertWBorderLeft").style.display = "none";
		document.getElementById("alertWBorderRight").style.display = "none";
		document.getElementById("alertHBorderTop").style.display = "none";
		document.getElementById("alertHBorderBottom").style.display = "none";
		document.getElementById("alertTitle").style.display = "none";
		document.getElementById("alertText").style.display = "none";
		document.getElementById("alertImg").style.display = "none";
		document.getElementById("alertImgText").style.display = "none";
		document.getElementById("alertOKButton").style.display = "none";
	}
};