(function($) {
	$.shopSelector = function(settings) {
		var $prefSelect = $(settings.prefSelect);
		var $townSelect = $(settings.townSelect);
		var $shopSelect = $(settings.shopSelect);
		var postedTownName = settings.postedTownName;
		var postedShopName = settings.postedShopName;
				
		if(!$prefSelect.size() || !$townSelect.size() || !$shopSelect.size()) return;
		
		var csvDir = settings.csvDir;
		var shopData = [];
				
		$prefSelect.change(function(e) {
			var value = $prefSelect.val();
			if(!value) return;
			
			$townSelect.find("option").not(":eq(0)").remove();
			$shopSelect.find("option").not(":eq(0)").remove();
			
			$.ajax({
				url: csvDir + value + ".csv",
				dataType: "text",
				success: function(data) {
					var data = data.split("\n");
					$.each(data, function(index) {
						var line = data[index].split(",");
						var townName = line[2];
						if(!shopData[townName]) {
							shopData[townName] = [];
							appendOption($townSelect, townName);
						}
						shopData[townName].push(line);
					});
					if(postedTownName) {
						setTimeout(function() {
							$townSelect.val(postedTownName);
							postedTownName = "";
							$townSelect.change();
						}, 0);
					}
				}
			});
		}).change();
				
		$townSelect.change(function(e) {
			var townName = $townSelect.val();
			if(!townName) return;
			
			$shopSelect.find("option").not(":eq(0)").remove();
			
			var data = shopData[townName];
			$.each(data, function(index) {
				var shopName = data[index][3];
				appendOption($shopSelect, shopName);
			});
			if(postedShopName) {
				setTimeout(function() {
					$shopSelect.val(postedShopName);
					postedShopName = "";
				}, 0);
			}
		});
		
		function appendOption($select, value) {
			$select.append($("<option>").html(value).attr("value", value));
		}
	}
})(jQuery)