/*
CoolClock by Simon Baird (simon dot baird at gmail dot com)
Version 1.0.6 (08-Jul-2008)
See http://simonbaird.com/coolclock/

Copyright (c) Simon Baird 2006-2008

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

Neither the name of the Simon Baird nor the names of other contributors may be used to endorse or promote products derived from this software
without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

// SDG: new code to accommodate server time use.
// SDG: set the global server hour, minute and seconds as per the page using this code.
var tmpServerHour = 0;
var tmpServerMinutes = 0;
var tmpServerSeconds = 0;
// SDG: end of new code to accommodate server time use.


window.CoolClock = function(canvasId,displayRadius,skinId,showSecondHand,gmtOffset) {
	return this.init(canvasId,displayRadius,skinId,showSecondHand,gmtOffset);
}

CoolClock.findAndCreateClocks = function() {
	var canvases = document.getElementsByTagName("canvas");
	for (var i=0;i<canvases.length;i++) {
		var fields = canvases[i].className.split(" ")[0].split(":");
		if (fields[0] == "CoolClock") {
			new CoolClock(canvases[i].id,fields[2],fields[1],fields[3]!="noSeconds",fields[4]);
		}
	}
}

// borrowed from behaviour.js - actually doesn't work right unless it's at the end of html document
// hence can't have a body onload, this is a bug. FIXME. Maybe have a setTimeout hack??
CoolClock.addLoadEvent = function(func){
	var oldonload = window.onload;
	if (typeof window.onload != 'function')
		window.onload = func;
	else
		window.onload = function() {
			oldonload();
			func();
		}
}

CoolClock.config = {
	clockTracker: {},
	tickDelay: 1000,
	longTickDelay: 15000,
	defaultRadius: 85,
	renderRadius: 100,
	defaultSkin: "swissRail",
	skins:	{
		// more skins in moreskins.js
		// try making your own...
		swissRail: {
			outerBorder: { lineWidth: 1, radius:95, color: "black", alpha: 1 },
			smallIndicator: { lineWidth: 2, startAt: 89, endAt: 93, color: "black", alpha: 1 },
			largeIndicator: { lineWidth: 4, startAt: 80, endAt: 93, color: "black", alpha: 1 },
			hourHand: { lineWidth: 8, startAt: -15, endAt: 50, color: "black", alpha: 1 },
			minuteHand: { lineWidth: 7, startAt: -15, endAt: 75, color: "black", alpha: 1 },
			secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "red", alpha: 1 },
			secondDecoration: { lineWidth: 1, startAt: 70, radius: 4, fillColor: "red", color: "red", alpha: 1 }
		},
		chunkySwiss: {
			outerBorder: { lineWidth: 4, radius:97, color: "black", alpha: 1 },
			smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "black", alpha: 1 },
			largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "black", alpha: 1 },
			hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "black", alpha: 1 },
			minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "black", alpha: 1 },
			secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
			secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
		},
		chunkySwissOnBlack: {
			outerBorder: { lineWidth: 4, radius:97, color: "white", alpha: 1 },
			smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "white", alpha: 1 },
			largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "white", alpha: 1 },
			hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "white", alpha: 1 },
			minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "white", alpha: 1 },
			secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
			secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
		}
	}
};

CoolClock.prototype = {
	init: function(canvasId,displayRadius,skinId,showSecondHand,gmtOffset) {
		this.canvasId = canvasId;
		this.displayRadius = displayRadius || CoolClock.config.defaultRadius;
		this.skinId = skinId || CoolClock.config.defaultSkin;
		this.showSecondHand = typeof showSecondHand == "boolean" ? showSecondHand : true;
		this.tickDelay = CoolClock.config[ this.showSecondHand ? "tickDelay" : "longTickDelay"];

		this.canvas = document.getElementById(canvasId);

		this.canvas.setAttribute("width",this.displayRadius*2);
		this.canvas.setAttribute("height",this.displayRadius*2);
	
		this.canvas.style.width = this.displayRadius*2 + "px";
		this.canvas.style.height = this.displayRadius*2 + "px";

		this.renderRadius = CoolClock.config.renderRadius; 
		
		// SDG: new code to accommodate server time use.
		// SDG: set the global server hour, minute and seconds as per the page using this code.
		if (this.canvas.useServerTime)
			{
			tmpServerHour = parseInt(this.canvas.serverHour);
			tmpServerMinutes = parseInt(this.canvas.serverMinutes);
			tmpServerSeconds = parseInt(this.canvas.serverSeconds);
			}
		// SDG: end of new code to accommodate server time use.
		
		this.scale = this.displayRadius / this.renderRadius;
		this.ctx = this.canvas.getContext("2d");
		this.ctx.scale(this.scale,this.scale);

		this.gmtOffset = gmtOffset != null ? parseFloat(gmtOffset) : gmtOffset;

		CoolClock.config.clockTracker[canvasId] = this;
		this.tick();
		return this;
	},

	fullCircle: function(skin) {
		this.fullCircleAt(this.renderRadius,this.renderRadius,skin);
	},

	fullCircleAt: function(x,y,skin) {
		with (this.ctx) {
			save();
			globalAlpha = skin.alpha;
			lineWidth = skin.lineWidth;
			if (!document.all)
				beginPath();
			if (document.all)
				// excanvas doesn't scale line width so we will do it here
				lineWidth = lineWidth * this.scale;
			arc(x, y, skin.radius, 0, 2*Math.PI, false);
			if (document.all)
				// excanvas doesn't close the circle so let's color in the gap
				arc(x, y, skin.radius, -0.1, 0.1, false);
			if (skin.fillColor) {
				fillStyle = skin.fillColor
				fill();
			}
			else {
				// XXX why not stroke and fill
				strokeStyle = skin.color;
				stroke();
			}
			restore();
		}
	},

	radialLineAtAngle: function(angleFraction,skin) {
		with (this.ctx) {
			save();
			translate(this.renderRadius,this.renderRadius);
			rotate(Math.PI * (2 * angleFraction - 0.5));
			globalAlpha = skin.alpha;
			strokeStyle = skin.color;
			lineWidth = skin.lineWidth;
			if (document.all)
				// excanvas doesn't scale line width so we will do it here
				lineWidth = lineWidth * this.scale;
			if (skin.radius) {
				this.fullCircleAt(skin.startAt,0,skin)
			}
			else {
				beginPath();
				moveTo(skin.startAt,0)
				lineTo(skin.endAt,0);
				stroke();
			}
			restore();
		}
	},

	render: function(hour,min,sec) {
		var skin = CoolClock.config.skins[this.skinId];
		this.ctx.clearRect(0,0,this.renderRadius*2,this.renderRadius*2);

		this.fullCircle(skin.outerBorder);
		// draw the minute lines around the outer clock
		for (var i=0;i<60;i++)
			this.radialLineAtAngle(i/60,skin[ i%5 ? "smallIndicator" : "largeIndicator"]);
		
		this.radialLineAtAngle((hour+min/60)/12,skin.hourHand);
		this.radialLineAtAngle((min+sec/60)/60,skin.minuteHand);
		if (this.showSecondHand) {
			this.radialLineAtAngle(sec/60,skin.secondHand);
			if (!document.all)
				// decoration doesn't render right in IE so lets turn it off
				this.radialLineAtAngle(sec/60,skin.secondDecoration);
		}
	},


	nextTick: function() {
		setTimeout("CoolClock.config.clockTracker['"+this.canvasId+"'].tick()",this.tickDelay);
	},

	stillHere: function() {
		return document.getElementById(this.canvasId) != null;
	},

	refreshDisplay: function() {
		// SDG: new code to accommodate server time use.
		if (this.canvas.useServerTime)
			{
			// SDG: work off the server time that we set on page load and increment hours, mins, secs from there.
			this.render(tmpServerHour,tmpServerMinutes,tmpServerSeconds);

			// Check seconds...
			if (tmpServerSeconds == 59)
				{
				tmpServerSeconds = 0;
				tmpServerMinutes = tmpServerMinutes + 1;				
				// Check minutes...
				if (tmpServerMinutes == 60)
					{
					tmpServerHour = tmpServerHour + 1;
					tmpServerMinutes = 0;	
					}
				}
			else
				{
				tmpServerSeconds = tmpServerSeconds + 1;
				}			
			}
		else
			{ // SDG: use predefined code instead.	
			var now = new Date();
			if (this.gmtOffset != null) {
				// use GMT + gmtOffset
				var offsetNow = new Date(now.valueOf() + (this.gmtOffset * 1000 * 60 * 60));			
				this.render(offsetNow.getUTCHours(),offsetNow.getUTCMinutes(),offsetNow.getUTCSeconds());
				}
			else 
				{
				// use local time
				this.render(now.getHours(),now.getMinutes(),now.getSeconds());
				}
			}
	},

	tick: function() {
		if (this.stillHere()) {
			this.refreshDisplay()
			this.nextTick();
		}
	}
}

CoolClock.addLoadEvent(CoolClock.findAndCreateClocks);