/**
 * http://www.openjs.com/scripts/events/keyboard_shortcuts/
 * Version : 2.01.A
 * By Binny V A
 * License : BSD
 */
shortcut = {
	'all_shortcuts':{},//All the shortcuts are stored in this array
	'add': function(shortcut_combination,callback,opt) {
		//Provide a set of default options
		var default_options = {
			'type':'keydown',
			'propagate':false,
			'disable_in_input':false,
			'target':document,
			'keycode':false
		}
		if(!opt) opt = default_options;
		else {
			for(var dfo in default_options) {
				if(typeof opt[dfo] == 'undefined') opt[dfo] = default_options[dfo];
			}
		}

		var ele = opt.target
		if(typeof opt.target == 'string') ele = document.getElementById(opt.target);
		var ths = this;
		shortcut_combination = shortcut_combination.toLowerCase();

		//The function to be called at keypress
		var func = function(e) {
			e = e || window.event;
			
			if(opt['disable_in_input']) { //Don't enable shortcut keys in Input, Textarea fields
				var element;
				if(e.target) element=e.target;
				else if(e.srcElement) element=e.srcElement;
				if(element.nodeType==3) element=element.parentNode;

				if(element.tagName == 'INPUT' || element.tagName == 'TEXTAREA') return;
			}
	
			//Find Which key is pressed
			if (e.keyCode) code = e.keyCode;
			else if (e.which) code = e.which;
			var character = String.fromCharCode(code).toLowerCase();
			
			if(code == 188) character=","; //If the user presses , when the type is onkeydown
			if(code == 190) character="."; //If the user presses , when the type is onkeydown
	
			var keys = shortcut_combination.split("+");
			//Key Pressed - counts the number of valid keypresses - if it is same as the number of keys, the shortcut function is invoked
			var kp = 0;
			
			//Work around for stupid Shift key bug created by using lowercase - as a result the shift+num combination was broken
			var shift_nums = {
				"`":"~",
				"1":"!",
				"2":"@",
				"3":"#",
				"4":"$",
				"5":"%",
				"6":"^",
				"7":"&",
				"8":"*",
				"9":"(",
				"0":")",
				"-":"_",
				"=":"+",
				";":":",
				"'":"\"",
				",":"<",
				".":">",
				"/":"?",
				"\\":"|"
			}
			//Special Keys - and their codes
			var special_keys = {
				'esc':27,
				'escape':27,
				'tab':9,
				'space':32,
				'return':13,
				'enter':13,
				'backspace':8,
	
				'scrolllock':145,
				'scroll_lock':145,
				'scroll':145,
				'capslock':20,
				'caps_lock':20,
				'caps':20,
				'numlock':144,
				'num_lock':144,
				'num':144,
				
				'pause':19,
				'break':19,
				
				'insert':45,
				'home':36,
				'delete':46,
				'end':35,
				
				'pageup':33,
				'page_up':33,
				'pu':33,
	
				'pagedown':34,
				'page_down':34,
				'pd':34,
	
				'left':37,
				'up':38,
				'right':39,
				'down':40,
	
				'f1':112,
				'f2':113,
				'f3':114,
				'f4':115,
				'f5':116,
				'f6':117,
				'f7':118,
				'f8':119,
				'f9':120,
				'f10':121,
				'f11':122,
				'f12':123
			}
	
			var modifiers = { 
				shift: { wanted:false, pressed:false},
				ctrl : { wanted:false, pressed:false},
				alt  : { wanted:false, pressed:false},
				meta : { wanted:false, pressed:false}	//Meta is Mac specific
			};
                        
			if(e.ctrlKey)	modifiers.ctrl.pressed = true;
			if(e.shiftKey)	modifiers.shift.pressed = true;
			if(e.altKey)	modifiers.alt.pressed = true;
			if(e.metaKey)   modifiers.meta.pressed = true;
                        
			for(var i=0; k=keys[i],i<keys.length; i++) {
				//Modifiers
				if(k == 'ctrl' || k == 'control') {
					kp++;
					modifiers.ctrl.wanted = true;

				} else if(k == 'shift') {
					kp++;
					modifiers.shift.wanted = true;

				} else if(k == 'alt') {
					kp++;
					modifiers.alt.wanted = true;
				} else if(k == 'meta') {
					kp++;
					modifiers.meta.wanted = true;
				} else if(k.length > 1) { //If it is a special key
					if(special_keys[k] == code) kp++;
					
				} else if(opt['keycode']) {
					if(opt['keycode'] == code) kp++;

				} else { //The special keys did not match
					if(character == k) kp++;
					else {
						if(shift_nums[character] && e.shiftKey) { //Stupid Shift key bug created by using lowercase
							character = shift_nums[character]; 
							if(character == k) kp++;
						}
					}
				}
			}

			if(kp == keys.length && 
						modifiers.ctrl.pressed == modifiers.ctrl.wanted &&
						modifiers.shift.pressed == modifiers.shift.wanted &&
						modifiers.alt.pressed == modifiers.alt.wanted &&
						modifiers.meta.pressed == modifiers.meta.wanted) {
				callback(e);
	
				if(!opt['propagate']) { //Stop the event
					//e.cancelBubble is supported by IE - this will kill the bubbling process.
					e.cancelBubble = true;
					e.returnValue = false;
	
					//e.stopPropagation works in Firefox.
					if (e.stopPropagation) {
						e.stopPropagation();
						e.preventDefault();
					}
					return false;
				}
			}
		}
		this.all_shortcuts[shortcut_combination] = {
			'callback':func, 
			'target':ele, 
			'event': opt['type']
		};
		//Attach the function with the event
		if(ele.addEventListener) ele.addEventListener(opt['type'], func, false);
		else if(ele.attachEvent) ele.attachEvent('on'+opt['type'], func);
		else ele['on'+opt['type']] = func;
	},

	//Remove the shortcut - just specify the shortcut and I will remove the binding
	'remove':function(shortcut_combination) {
		shortcut_combination = shortcut_combination.toLowerCase();
		var binding = this.all_shortcuts[shortcut_combination];
		delete(this.all_shortcuts[shortcut_combination])
		if(!binding) return;
		var type = binding['event'];
		var ele = binding['target'];
		var callback = binding['callback'];

		if(ele.detachEvent) ele.detachEvent('on'+type, callback);
		else if(ele.removeEventListener) ele.removeEventListener(type, callback, false);
		else ele['on'+type] = false;
	}
}

/* ExpressMail Functions */
var shift_up_count = 0;
var shift_down_count = 0;
shortcut.add("N",function(){ new_message("new","null"); },{'disable_in_input':true});

shortcut.add("Esc",function(){
	var window_closed = false;
	for(var window in arrayJSWin)
	{
		if (arrayJSWin[window].visible)
		{
			arrayJSWin[window].close();
			window_closed = true;
		}
	}
	if (!window_closed)
		delete_border(get_msg_id(), 'false');
},{'disable_in_input':false});

shortcut.add("I",function(){ exec_msg_action('print'); },{'disable_in_input':true});
shortcut.add("E",function(){ exec_msg_action('forward'); },{'disable_in_input':true});
shortcut.add("R",function(){ exec_msg_action('reply'); },{'disable_in_input':true});
shortcut.add("Delete",function(){
	if ( Element('border_id_0').className==='menu-sel' )
	{
		var selected_msgs = '';
		var current_folder = get_current_folder();
		all_messages = Element('tbody_box').childNodes;
		
		for (var i=0; i < all_messages.length; i++)
			if (all_messages[i].style.backgroundColor != '')
				selected_msgs += all_messages[i].id + ',';
		
		selected_msgs = selected_msgs.substring(0,(selected_msgs.length-1));
		delete_msgs(current_folder, selected_msgs, 'null');
	}
	else
		exec_msg_action('delete');
}
,{'disable_in_input':true});

shortcut.add("Ctrl+Up",function(){ exec_msg_action('previous'); },{'disable_in_input':true});
shortcut.add("Ctrl+Down",function(){ exec_msg_action('next'); },{'disable_in_input':true});
if (is_ie){
	shortcut.add("down",function(){ select_msg('null', 'down'); },{'disable_in_input':false});
	shortcut.add("up",function(){ select_msg('null', 'up'); },{'disable_in_input':false});
	shortcut.add("Shift+down",function(){
		if (shift_up_count > 0)
			unselect_top_msg();
		else
			select_bottom_msg();
	},{'disable_in_input':false, 'propagate':false});
	shortcut.add("Shift+up",function(){
		if (shift_down_count > 0)
			unselect_bottom_msg();
		else
			select_top_msg();
	},{'disable_in_input':false, 'propagate':false});
}
else{
	shortcut.add("down",function(){ select_msg('null', 'down'); },{'type':'keypress', 'disable_in_input':false});
	shortcut.add("up",function(){ select_msg('null', 'up'); },{'type':'keypress', 'disable_in_input':false});
	shortcut.add("Shift+down",function(){
		if (shift_up_count > 0)
			unselect_top_msg();
		else
			select_bottom_msg();
	},{'type':'keypress','disable_in_input':false, 'propagate':false});
	shortcut.add("Shift+up",function(){
		if (shift_down_count > 0)
			unselect_bottom_msg();
		else
			select_top_msg();
	},{'type':'keypress','disable_in_input':false, 'propagate':false});
}

shortcut.add("return",function(){
	if ( Element('border_id_0').className==='menu-sel' )
	{
		all_messages = Element('tbody_box').childNodes;
		for (var i=0; i < all_messages.length; i++)
		{
			if (all_messages[i].style.backgroundColor != '')
			{
				Element("td_who_" + all_messages[i].id).onclick();
				return;
			}
		}
	}
}
,{'disable_in_input':true});

shortcut.add("f9",function(){
	Element("em_refresh_button").onclick();
	return;
},{'disable_in_input':true});

function exec_msg_action(action)
{
	var msg_id = get_msg_id();
	if (msg_id)
	{
		var msg_id = 'msg_opt_' + action + '_' + msg_id;
		try {Element(msg_id).onclick();}
		catch(e){/*alert(e);*/}
	}
	return;
}

function get_msg_id()
{
	children = Element('border_tr').childNodes;
	
	for (var i=0; i<children.length; i++)
	{
		if ( (children[i].nodeName==='TD') && (children[i].className==='menu-sel') && children[i].id != 'border_id_0')
		{
			var border_selected = children[i];
			var msg_id = border_selected.id.replace("border_id_","");
			return msg_id;
		}
	}
	return false;
}

function select_msg(msg_number, keyboard_action)
{
	if ( Element('border_id_0').className != 'menu-sel' )
		return;
	
	shift_up_count = 0;
	shift_down_count = 0;

	if (msg_number != 'null')
	{
		var selected_msg = Element(msg_number);
		all_messages = selected_msg.parentNode.childNodes;
		for (var i=0; i < all_messages.length; i++)
		{
			if (all_messages[i].style.backgroundColor != '')
			{
				all_messages[i].style.color = '';
				all_messages[i].style.backgroundColor = '';
				break;
			}
		}
		selected_msg.style.color = 'white';
		selected_msg.style.backgroundColor = '#5194d2';
	}
	else
	{
		all_messages = Element('tbody_box').childNodes;
		if (keyboard_action == 'down')
		{
			if (all_messages[all_messages.length-1].style.backgroundColor != '')
				return false;
			
			for (var i=all_messages.length-1; i >=0; i--)
			{
				if (all_messages[i].style.backgroundColor != '')
				{
					all_messages[i+1].style.color = 'white';
					all_messages[i+1].style.backgroundColor = '#5194d2';
					break;
				}
			}
			for (; i>=0; i--)
			{
				all_messages[i].style.color = '';
				all_messages[i].style.backgroundColor = '';
			}
			return true;
		}
		else
		{
			if (all_messages[0].style.backgroundColor != '')
				return false;
			
			for (var i=0; i < all_messages.length; i++)
			{
				if (all_messages[i].style.backgroundColor != '')
				{
					all_messages[i-1].style.color = 'white';
					all_messages[i-1].style.backgroundColor = '#5194d2';
					break;
				}
			}
			for (; i< all_messages.length; i++)
			{
				all_messages[i].style.color = '';
				all_messages[i].style.backgroundColor = '';
			}
			return true;
		}
	}
}

function select_bottom_msg()
{
	all_messages = Element('tbody_box').childNodes;
	
	if (all_messages[all_messages.length-1].style.backgroundColor != '')
		return;
	
	for (var i=all_messages.length-1; i >=0; i--)
	{
		if ((all_messages[i].style.backgroundColor != '') && (i+1 <= all_messages.length-1))
		{
			shift_down_count++;
			all_messages[i+1].style.color = 'white';
			all_messages[i+1].style.backgroundColor = '#5194d2';
			break;
		}
	}
}

function select_top_msg()
{
	all_messages = Element('tbody_box').childNodes;
	
	if (all_messages[0].style.backgroundColor != '')
		return;
	
	for (var i=0; i <=all_messages.length-1; i++)
	{
		if (all_messages[i].style.backgroundColor != '')
		{
			shift_up_count++;
			all_messages[i-1].style.color = 'white';
			all_messages[i-1].style.backgroundColor = '#5194d2';
			break;
		}
	}
}

function unselect_bottom_msg()
{
	all_messages = Element('tbody_box').childNodes;
	for (var i=all_messages.length-1; i >=0; i--)
	{
		if (all_messages[i].style.backgroundColor != '')
		{
			shift_down_count--;
			all_messages[i].style.color = '';
			all_messages[i].style.backgroundColor = '';
			break;
		}
	}
}

function unselect_top_msg()
{
	all_messages = Element('tbody_box').childNodes;
	for (var i=0; i <=all_messages.length-1; i++)
	{
		if (all_messages[i].style.backgroundColor != '')
		{
			shift_up_count--;
			all_messages[i].style.color = '';
			all_messages[i].style.backgroundColor = '';
			break;
		}
	}
}