$(function() {
	var symbols = {
		"USD": "$",
		"EUR": "€",
		"GBP": "£",
		"Miles": "m",
		"Kilometer": "km",
		"inch": "\"",
		"centimeter": "cm"
	};
	
	function list() {
		var ul = $("#conversions").empty().page( "destroy" ),
			ulEdit = $("#edit-conversions").empty().page( "destroy" );
		$.each(all, function(index, conversion) {
			// if last update was less then a minute ago, don't update
			if (conversion.type == "currency" && !conversion.rate || conversion.updated && conversion.updated + 60000 < +new Date) {
				var self = conversion;
				var url = "http://query.yahooapis.com/v1/public/yql?q=select%20rate%2Cname%20from%20csv%20where%20url%3D'http%3A%2F%2Fdownload.finance.yahoo.com%2Fd%2Fquotes%3Fs%3D" + conversion.from + conversion.to + "%253DX%26f%3Dl1n'%20and%20columns%3D'rate%2Cname'&format=json&diagnostics=true&callback=?";
				$.getJSON(url, function(result) {
					self.rate = parseFloat(result.query.results.row.rate);
					// TODO trigger a custom event instead of keyup?
					$("#term").keyup();
					self.updated = +new Date;
					conversions.store();
				});
			}
			$("#conversion-field").tmpl(conversion, {
				symbols: symbols
			}).appendTo(ul);
			$("#conversion-edit-field").tmpl(conversion, {
				symbols: symbols
			}).appendTo(ulEdit);
		});
		ul.page();
		// TODO trigger a custom event instead of keyup?
		$("#term").keyup();
	}
	var all = conversions.all();
	$("#term").keyup(function() {
		var value = this.value;
		$.each(all, function(index, conversion) {
			$("#" + conversion.from + conversion.to).val( conversion.rate
				? Math.ceil(value * conversion.rate * 100) / 100
				: "Rate not available, yet."
			);
		});
	}).focus();
	list();
	$("form").submit(function() {
		$("#term").blur();
		return false;
	});
	$("#add").click(function() {
		all.push({
			type: "currency",
			from: $("#currency-options-from").val(),
			to: $("#currency-options-to").val()
		});
		conversions.store();
		list();
		return false;
	});
	$("#clear").click(function() {
		conversions.clear();
		list();
		return false;
	});
	$("#restore").click(function() {
		conversions.restore();
		list();
		return false;
	});
	
	$("#edit-conversions").click(function(event) {
		var target = $(event.target).closest(".deletebutton");
		if (target.length) {
			conversions.remove(target.prev("label").attr("for"));
			list();
		}
		return false;
	})
});