///////////////////////////////////////////////////////////////////////////
//////////////////////  ANALOG CLOCK FUNCTIONS  ///////////////////////////
/////////////////  Clock code used from W3Schools.com  ////////////////////
////////  Refer to their site about applicable use of the code  ///////////
///////////////////////////////////////////////////////////////////////////

var canvas = document.getElementById("analog-clock");
var ctx = canvas.getContext("2d");
var radius = canvas.height / 2;
ctx.translate(radius, radius);
radius = radius * 0.90
setInterval(drawClock, 1000);

// add 0 to single digit time min, sec
function checkTime(i) {
  if (i < 10) {i = "0" + i};  // add zero in front of numbers < 10
  return i;
}

function drawClock() {
	drawFace(ctx, radius);
	drawNumbers(ctx, radius);
	drawTime(ctx, radius);
}

function drawFace(ctx, radius) {
	var grad;
	ctx.beginPath();
	ctx.arc(0, 0, radius, 0, 2*Math.PI);
	ctx.fillStyle = 'white';
	ctx.fill();
	grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
			  grad.addColorStop(0, '#333');
			  grad.addColorStop(0.5, 'white');
			  grad.addColorStop(1, '#333');
			  ctx.strokeStyle = grad;
			  ctx.lineWidth = radius*0.1;
			  ctx.stroke();
			  ctx.beginPath();
			  ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
			  ctx.fillStyle = '#333';
			  ctx.fill();
			}

			function drawNumbers(ctx, radius) {
			  var ang;
			  var num;
			  ctx.font = radius*0.15 + "px arial";
			  ctx.textBaseline="middle";
			  ctx.textAlign="center";
			  for(num = 1; num < 13; num++){
				ang = num * Math.PI / 6;
				ctx.rotate(ang);
				ctx.translate(0, -radius*0.85);
				ctx.rotate(-ang);
				ctx.fillText(num.toString(), 0, 0);
				ctx.rotate(ang);
				ctx.translate(0, radius*0.85);
				ctx.rotate(-ang);
			  }
			}

			function drawTime(ctx, radius){
				
				var deviceClock = new Date();
				var hour = deviceClock.getHours();
				var minute = deviceClock.getMinutes();
				var second = deviceClock.getSeconds();
				
				var ampm = hour >= 12 ? 'P.M.' : 'A.M.';
			    hour = hour % 12;
			    hour = hour ? hour : 12; // the hour '0' should be '12'
			    //minute = minute < 10 ? '0'+minute : minute;
				
				// CHECKTIME FUNC ADDS LEADING '0' if <10
				hour = checkTime(hour);
				minute = checkTime(minute);
				second = checkTime(second);
				
				//digital time display
				var myDigTime = hour + ":" + minute +":" + second;
				document.getElementById('myTime').innerHTML = myDigTime + ' ' + ampm;
				
				var dd = deviceClock.getDate();
				var mm = deviceClock.getMonth(); 
				mm++; //Increment because Jan is month 0
				dd = checkTime(dd);
				mm = checkTime(mm);
				var yyyy = deviceClock.getFullYear();

				var todaysDate = mm + '/' + dd + '/' + yyyy;
				document.getElementById("myDate").innerHTML = "Today: " + todaysDate;
				
				// OFFSET
				var utcOffset = deviceClock.getTimezoneOffset()/60;
				if (utcOffset > 0) {
					utcOffset = "(UTC-" + utcOffset + ")";
				} else {
					utcOffset = "(UTC+" + Math.abs(utcOffset) + ")";  
				};
				document.getElementById("myTimeTitle").innerHTML = utcOffset;

				//hour
				hour=hour%12;
				hour=(hour*Math.PI/6)+
				(minute*Math.PI/(6*60))+
				(second*Math.PI/(360*60));
				drawHand(ctx, hour, radius*0.5, radius*0.07);
				//minute
				minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
				drawHand(ctx, minute, radius*0.8, radius*0.07);
				// second
				second=(second*Math.PI/30);
				drawHand(ctx, second, radius*0.9, radius*0.02);
			}

			function drawHand(ctx, pos, length, width) {
				ctx.beginPath();
				ctx.lineWidth = width;
				ctx.lineCap = "round";
				ctx.moveTo(0,0);
				ctx.rotate(pos);
				ctx.lineTo(0, -length);
				ctx.stroke();
				ctx.rotate(-pos);
			}