ninja.seeder = {
		init: (function () {
			document.getElementById("generatekeyinput").value = "";
		})(),

		// number of mouse movements to wait for
		seedLimit: (function () {
			var num = Crypto.util.randomBytes(12)[11];
			return 200 + Math.floor(num);
		})(),

		seedCount: 0, // counter
		lastInputTime: new Date().getTime(),
		seedPoints: [],

		// seed function exists to wait for mouse movement to add more entropy before generating an address
		seed: function (evt) {
			if (!evt) var evt = window.event;
			var timeStamp = new Date().getTime();
		// seeding is over now we generate and display the address
			if (ninja.seeder.seedCount == ninja.seeder.seedLimit) {
				ninja.seeder.seedCount++;
			ninja.wallets.singlewallet.open();
				document.getElementById("generate").style.display = "none";
				document.getElementById("menu").style.visibility = "visible";
				ninja.seeder.removePoints();
			}
			// seed mouse position X and Y when mouse movements are greater than 40ms apart.
			else if ((ninja.seeder.seedCount < ninja.seeder.seedLimit) && evt && (timeStamp - ninja.seeder.lastInputTime) > 40) {
				SecureRandom.seedTime();
				SecureRandom.seedInt16((evt.clientX * evt.clientY));
				ninja.seeder.showPoint(evt.clientX, evt.clientY);
				ninja.seeder.seedCount++;
				ninja.seeder.lastInputTime = new Date().getTime();
				ninja.seeder.showPool();
			}
		},

		// seed function exists to wait for mouse movement to add more entropy before generating an address
		seedKeyPress: function (evt) {
			if (!evt) var evt = window.event;
			// seeding is over now we generate and display the address
			if (ninja.seeder.seedCount == ninja.seeder.seedLimit) {
				ninja.seeder.seedCount++;
			ninja.wallets.singlewallet.open();
				document.getElementById("generate").style.display = "none";
				document.getElementById("menu").style.visibility = "visible";
				ninja.seeder.removePoints();
			}
			// seed key press character
			else if ((ninja.seeder.seedCount < ninja.seeder.seedLimit) && evt.which) {
				var timeStamp = new Date().getTime();
				// seed a bunch (minimum seedLimit) of times
				SecureRandom.seedTime();
				SecureRandom.seedInt8(evt.which);
				var keyPressTimeDiff = timeStamp - ninja.seeder.lastInputTime;
				SecureRandom.seedInt8(keyPressTimeDiff);
				ninja.seeder.seedCount++;
				ninja.seeder.lastInputTime = new Date().getTime();
				ninja.seeder.showPool();
			}
		},

		showPool: function () {
			var poolHex;
			if (SecureRandom.poolCopyOnInit != null) {
				poolHex = Crypto.util.bytesToHex(SecureRandom.poolCopyOnInit);
				document.getElementById("seedpool").innerHTML = poolHex;
				document.getElementById("seedpooldisplay").innerHTML = poolHex;
			}
			else {
				poolHex = Crypto.util.bytesToHex(SecureRandom.pool);
				document.getElementById("seedpool").innerHTML = poolHex;
				document.getElementById("seedpooldisplay").innerHTML = poolHex;
			}
			document.getElementById("mousemovelimit").innerHTML = (ninja.seeder.seedLimit - ninja.seeder.seedCount);
		},

		showPoint: function (x, y) {
			var div = document.createElement("div");
			div.setAttribute("class", "seedpoint");
			div.style.top = y + "px";
			div.style.left = x + "px";
			
			// let's make the entropy 'points' grow and change color!
			percentageComplete = ninja.seeder.seedCount / ninja.seeder.seedLimit;
			document.getElementById("progress-bar-percentage").style.width=Math.ceil(percentageComplete*100)+"%";

			// for some reason, appending these divs to an IOS device breaks clicking altogether (?)
			if (navigator.platform != 'iPad' && navigator.platform != 'iPhone' && navigator.platform != 'iPod') {
				document.body.appendChild(div);
			}
			ninja.seeder.seedPoints.push(div);
		},

		removePoints: function () {
			for (var i = 0; i < ninja.seeder.seedPoints.length; i++) {
				document.body.removeChild(ninja.seeder.seedPoints[i]);
			}
			ninja.seeder.seedPoints = [];
		}
	};

ninja.qrCode = {
	// determine which type number is big enough for the input text length
	getTypeNumber: function (text) {
		var lengthCalculation = text.length * 8 + 12; // length as calculated by the QRCode
		if (lengthCalculation < 72) { return 1; }
		else if (lengthCalculation < 128) { return 2; }
		else if (lengthCalculation < 208) { return 3; }
		else if (lengthCalculation < 288) { return 4; }
		else if (lengthCalculation < 368) { return 5; }
		else if (lengthCalculation < 480) { return 6; }
		else if (lengthCalculation < 528) { return 7; }
		else if (lengthCalculation < 688) { return 8; }
		else if (lengthCalculation < 800) { return 9; }
		else if (lengthCalculation < 976) { return 10; }
		return null;
	},

	createCanvas: function (text, sizeMultiplier) {
		sizeMultiplier = (sizeMultiplier == undefined) ? 2 : sizeMultiplier; // default 2
		// create the qrcode itself
		var typeNumber = ninja.qrCode.getTypeNumber(text);
		var qrcode = new QRCode(typeNumber, QRCode.ErrorCorrectLevel.H);
		qrcode.addData(text);
		qrcode.make();
		var width = qrcode.getModuleCount() * sizeMultiplier;
		var height = qrcode.getModuleCount() * sizeMultiplier;
		// create canvas element
		var canvas = document.createElement('canvas');
		var scale = 10.0;
		canvas.width = width * scale;
		canvas.height = height * scale;
		canvas.style.width = width + 'px';
		canvas.style.height = height + 'px';
		var ctx = canvas.getContext('2d');
		ctx.scale(scale, scale);
		// compute tileW/tileH based on width/height
		var tileW = width / qrcode.getModuleCount();
		var tileH = height / qrcode.getModuleCount();
		// draw in the canvas
		for (var row = 0; row < qrcode.getModuleCount(); row++) {
			for (var col = 0; col < qrcode.getModuleCount(); col++) {
				ctx.fillStyle = qrcode.isDark(row, col) ? "#000000" : "#ffffff";
				ctx.fillRect(col * tileW, row * tileH, tileW, tileH);
			}
		}
		// return just built canvas
		return canvas;
	},

	// generate a QRCode and return it's representation as an Html table 
	createTableHtml: function (text) {
		var typeNumber = ninja.qrCode.getTypeNumber(text);
		var qr = new QRCode(typeNumber, QRCode.ErrorCorrectLevel.H);
		qr.addData(text);
		qr.make();
		var tableHtml = "<table class='qrcodetable'>";
		for (var r = 0; r < qr.getModuleCount(); r++) {
			tableHtml += "<tr>";
			for (var c = 0; c < qr.getModuleCount(); c++) {
				if (qr.isDark(r, c)) {
					tableHtml += "<td class='qrcodetddark'/>";
				} else {
					tableHtml += "<td class='qrcodetdlight'/>";
				}
			}
			tableHtml += "</tr>";
		}
		tableHtml += "</table>";
		return tableHtml;
	},

	// show QRCodes with canvas OR table (IE8)
	// parameter: keyValuePair 
	// example: { "id1": "string1", "id2": "string2"}
	//		"id1" is the id of a div element where you want a QRCode inserted.
	//		"string1" is the string you want encoded into the QRCode.
	showQrCode: function (keyValuePair, sizeMultiplier) {
		for (var key in keyValuePair) {
			var value = keyValuePair[key];
			try {
				if (document.getElementById(key)) {
					document.getElementById(key).innerHTML = "";
					document.getElementById(key).appendChild(ninja.qrCode.createCanvas(value, sizeMultiplier));
				}
			}
			catch (e) {
				// for browsers that do not support canvas (IE8)
				document.getElementById(key).innerHTML = ninja.qrCode.createTableHtml(value);
			}
		}
	}
};

ninja.tabSwitch = function (walletTab) {
	if (walletTab.className.indexOf("selected") == -1) {
		// unselect all tabs
		for (var wType in ninja.wallets) {
			document.getElementById(wType).className = "tab";
			ninja.wallets[wType].close();
		}
		walletTab.className += " selected";
		ninja.wallets[walletTab.getAttribute("id")].open();
	}
};

ninja.envSecurityCheck = function() {
	var innerHTML = "";
	switch(window.location.protocol) {
		case 'http:':
		case 'https:':
			innerHTML = '<span style="color: #990000;">You appear to be running this generator off of a live website, which is not recommended for creating valuable wallets. Instead, use the download link at the bottom of this page to download the ZIP file from GitHub and run this generator offline as a \'local\' HTML file.</span>';
			break;
		case 'file:':
			innerHTML = '<span style="color: #009900;">You are running this generator from your own download.</span>';
			break;
		default:
	} 
	document.getElementById('envSecurityCheck').innerHTML = innerHTML;
	document.getElementById('seedEnvSecurityCheck').innerHTML = innerHTML;
};

ninja.browserSecurityCheck = function() {
	var innerHTML = "";
	if (window.crypto && window.crypto.getRandomValues) {
		innerHTML = '<span style="color: #009900;">Your browser is capable of generating cryptographically random keys using window.crypto.getRandomValues</span>';
	} else {
		innerHTML = '<span style="color: #990000;">Your browser does NOT support window.crypto.getRandomValues(), which is important for generating the most secure random numbers possible. Please use a more modern browser.</span>';
	} 
	document.getElementById('browserSecurityCheck').innerHTML = innerHTML;
	document.getElementById('seedBrowserSecurityCheck').innerHTML = innerHTML;
}

ninja.getQueryString = function () {
	var result = {}, queryString = location.search.substring(1), re = /([^&=]+)=([^&]*)/g, m;
	while (m = re.exec(queryString)) {
		result[decodeURIComponent(m[1])] = decodeURIComponent(m[2]);
	}
	return result;
};

// use when passing an Array of Functions
ninja.runSerialized = function (functions, onComplete) {
	onComplete = onComplete || function () { };

	if (functions.length === 0) onComplete();
	else {
		// run the first function, and make it call this
		// function when finished with the rest of the list
		var f = functions.shift();
		f(function () { ninja.runSerialized(functions, onComplete); });
	}
};

ninja.forSerialized = function (initial, max, whatToDo, onComplete) {
	onComplete = onComplete || function () { };

	if (initial === max) { onComplete(); }
	else {
		// same idea as runSerialized
		whatToDo(initial, function () { ninja.forSerialized(++initial, max, whatToDo, onComplete); });
	}
};

// use when passing an Object (dictionary) of Functions
ninja.foreachSerialized = function (collection, whatToDo, onComplete) {
	var keys = [];
	for (var name in collection) {
		keys.push(name);
	}
	ninja.forSerialized(0, keys.length, function (i, callback) {
		whatToDo(keys[i], callback);
	}, onComplete);
};