var refreshInterval = 60000; //60 seconds
var	serverTimeOffset = -5;
var localTimeAtLoad = new Date();
var timeAdjust = (localTimeAtLoad.getTimezoneOffset() / 60) + serverTimeOffset; //hours

function runCountdown(){
	currentTime = new Date(); //local time
	currentESTHour = currentTime.getHours() + timeAdjust; //24-hour time

	displayHours = (currentESTHour > 12) ? currentESTHour - 12 : currentESTHour;
	displayMinutes = (currentTime.getMinutes() < 10) ? "0" + currentTime.getMinutes() : currentTime.getMinutes();
	displayTime = displayHours + ":" + displayMinutes + " EST";
	
  rowDate = new Date();

	timeRows = $("#todaysShowsTable tr");

  numRows = timeRows.length;
  keepLooking = true;
  
  for(var i = 0; i<numRows; i++){
	  if(timeRows[i].firstChild.tagName == "TD"){  //otherwise firefox breaks
	
	    var rowTime = timeRows[i].id;
	    var timeArray = rowTime.split(":");
	    rowDate.setHours(timeArray[1] - timeAdjust, timeArray[2]);
	    var timeDiff = (rowDate - currentTime)/(60*1000);
		    if(timeDiff > 0 && keepLooking){
		      var minutes = Math.floor(timeDiff % 60); //this used to be round() instead of floor()
		      var hours = Math.floor(timeDiff / 60);
					var timeStr = "";		
		
					if(hours > 1){
						timeStr += hours.toString() + " hours";
					}else if(hours == 1){
						timeStr += hours.toString() + " hour";
					}
		
					if(minutes > 1){
						if(hours > 0){timeStr += " and ";}
						timeStr += minutes.toString() + " minutes";
					}else if(minutes == 1){
						if(hours > 0){timeStr += " and ";}
						timeStr += minutes.toString() + " minute";
					}
		
					var message = 'Next show in <span class="dynamic">'+timeStr+'</span>';
		      keepLooking = false;
		    }
		
		    if(keepLooking){  //no shows left today
		      var message = '<span>Next show <span class="dynamic">tomorrow</span></span>';
		    }
		  }
  }

  $("#countdownTimer").html(message);
  $("#timeEST").html('Currently <span class="dynamic">'+ displayTime +'</span>');
}

function refreshData(){
  if($("#todaysShowsTable")){
    runCountdown();  //start countdown timer to next show
  }

	$("#onAirInfo").load("includes/onair_ajax.php", function(response, status, xhr){
		if(status == "error"){
			$("#onAirInfo").html('<span>Error: Could not load content.</span>');
		}
	});  
}

$(document).ready(function(){
  refreshData(); //initialize data
  setInterval(refreshData, refreshInterval);	  //refresh once/minute	
});