/*
* jQuery Hotkeys Plugin
* Copyright 2010, John Resig
* Dual licensed under the MIT or GPL Version 2 licenses.
*
* Based upon the plugin by Tzury Bar Yochay:
* http://github.com/tzuryby/hotkeys
*
* Original idea by:
* Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
*/

(function (jQuery) {

	jQuery.hotkeys = {
		version: "0.8",

		specialKeys: {
			8: "backspace", 9: "tab", 13: "return", 16: "shift", 17: "ctrl", 18: "alt", 19: "pause",
			20: "capslock", 27: "esc", 32: "space", 33: "pageup", 34: "pagedown", 35: "end", 36: "home",
			37: "left", 38: "up", 39: "right", 40: "down", 45: "insert", 46: "del",
			96: "0", 97: "1", 98: "2", 99: "3", 100: "4", 101: "5", 102: "6", 103: "7",
			104: "8", 105: "9", 106: "*", 107: "+", 109: "-", 110: ".", 111: "/",
			112: "f1", 113: "f2", 114: "f3", 115: "f4", 116: "f5", 117: "f6", 118: "f7", 119: "f8",
			120: "f9", 121: "f10", 122: "f11", 123: "f12", 144: "numlock", 145: "scroll", 191: "/", 224: "meta"
		},

		shiftNums: {
			"`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
			"8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ": ", "'": "\"", ",": "<",
			".": ">", "/": "?", "\\": "|"
		}
	};

	function keyHandler(handleObj) {
		// Only care when a possible input has been specified
		if (typeof handleObj.data !== "string") {
			return;
		}

		var origHandler = handleObj.handler,
			keys = handleObj.data.toLowerCase().split(" ");

		handleObj.handler = function (event) {
			// Don't fire in text-accepting inputs that we didn't directly bind to
			if (this !== event.target && (/textarea|select/i.test(event.target.nodeName) ||
				 event.target.type === "text")) {
				return;
			}

			// Keypress represents characters, not special keys
			var special = event.type !== "keypress" && jQuery.hotkeys.specialKeys[event.which],
				character = String.fromCharCode(event.which).toLowerCase(),
				key, modif = "", possible = {};

			// check combinations (alt|ctrl|shift+anything)
			if (event.altKey && special !== "alt") {
				modif += "alt+";
			}

			if (event.ctrlKey && special !== "ctrl") {
				modif += "ctrl+";
			}

			// TODO: Need to make sure this works consistently across platforms
			if (event.metaKey && !event.ctrlKey && special !== "meta") {
				modif += "meta+";
			}

			if (event.shiftKey && special !== "shift") {
				modif += "shift+";
			}

			if (special) {
				possible[modif + special] = true;

			} else {
				possible[modif + character] = true;
				possible[modif + jQuery.hotkeys.shiftNums[character]] = true;

				// "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
				if (modif === "shift+") {
					possible[jQuery.hotkeys.shiftNums[character]] = true;
				}
			}

			for (var i = 0, l = keys.length; i < l; i++) {
				if (possible[keys[i]]) {
					return origHandler.apply(this, arguments);
				}
			}
		};
	}

	jQuery.each(["keydown", "keyup", "keypress"], function () {
		jQuery.event.special[this] = { add: keyHandler };
	});

})(jQuery);