function ProxyDialer() {}

ProxyDialer.userNumber = null;
ProxyDialer.errorMessage = "";
ProxyDialer.eventManager = new EventManager();
ProxyDialer.checkCount = 0;
ProxyDialer.MAX_CHECK_TRIES = 5;
ProxyDialer.actionURL = "/userapp/proxyDialAction.html";

ProxyDialer.DIALER_FAILURE_EVENT = "DialerFailure";

ProxyDialer.dialNumber = function(numberToDial, state) {
	if (ProxyDialer.userNumber == null) {
		ProxyDialer.errorMessage = "ERROR:  User phone number not set!";
		return false;
	}
	
	if (state == null) {
		state = "Initializing";
	}
	
	switch (state) {
		case "Initializing":
			// check status of the ProxyDialer
			// reset the check count
			ProxyDialer.checkCount = 0;
			ProxyDialer.eventManager.clearDelegates("DialerReady");
			var delegate = new FunctionDelegate(ProxyDialer.dialNumber, [numberToDial, "DialerReady"]);
			ProxyDialer.eventManager.addDelegate("DialerReady", delegate);			
			ProxyDialer.checkDialerStatus();
			break;
		case "DialerReady":		
			var url = ProxyDialer.actionURL;
			url += "?action=makeCall&extension=" + encodeURIComponent(ProxyDialer.userNumber) + "&dialExtension=" + encodeURIComponent(numberToDial);
			Ajax.submitRequest(url, ProxyDialer.dialNumberCallback);
			break;			
	}
}

ProxyDialer.checkDialerStatus = function(doWait) {
	if (ProxyDialer.checkCount >= ProxyDialer.MAX_CHECK_TRIES) {
		ProxyDialer.errorMessage = "Could not place call.  The system may be busy.  Please try again in a few moments.";
		ProxyDialer.eventManager.fireEvent(ProxyDialer.DIALER_FAILURE_EVENT);
		return;
	}
	if (doWait) {
		setTimeout("ProxyDialer.checkDialerStatus(false)", 1000);
		return;
	}	
	var url = ProxyDialer.actionURL + "?action=checkStatus";
	Ajax.submitRequest(url, ProxyDialer.checkDialerStatusCallback);
}

ProxyDialer.checkDialerStatusCallback = function(req, err) {
	if (!err && req.responseText) {
		try {
			if (trim(req.responseText) == "Idle") {
				ProxyDialer.eventManager.fireEvent("DialerReady");
			}
			else {
				ProxyDialer.checkCount++;
				ProxyDialer.checkDialerStatus(true);
			}
			return;
		}
		catch (ex) {
			ProxyDialer.errorMessage = "System Error:  " + ex.toString();
		}
	}
	
	ProxyDialer.eventManager.fireEvent(ProxyDialer.DIALER_FAILURE_EVENT);
}

ProxyDialer.dialNumberCallback = function(req, err) {
	if (req.responseText && trim(req.responseText).length > 0) {
		ProxyDialer.errorMessage = req.responseText;
		ProxyDialer.eventManager.fireEvent(ProxyDialer.DIALER_FAILURE_EVENT);		
	}
}