/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <darktempler@gmail.com> wrote this file. As long as you retain this notice you
 * can do whatever you want with my code. If we meet some day, and you think
 * this code is worth it, you can buy me a beer in return - Matt Labrum (-dt-)
 * ----------------------------------------------------------------------------
 */
 
 /* 
	$LastChangedBy: dt $
	$LastChangedDate: 2007-11-02 20:49:38 -0700 (Fri, 02 Nov 2007) $
	$LastChangedRevision: 321 $
	$HeadURL: http://version.thedt.net/scripts/plusscripts/musicNowplaying/hotkeys.js $
*/

var _hotkeys = {};
var _hotkeywnd = false;
var WM_HOTKEY = 0x312;
var WM_USER = 0x400;

function OnWndMessageHotKeyEvent_MessageNotification(wnd, message, wParam, lParam){
	switch(message){
		case WM_HOTKEY :
		Debug.Trace('hotkey');
			triggerEvent('hotkey_' + wParam);
			return -1;
		break;
	
	
	}
}

function registerGlobalHotkey(key, func){
	if(!_hotkeywnd){
		_hotkeywnd = MsgPlus.CreateWnd("interface.xml", "WndMessageHotkey", 2);
		_hotkeywnd.RegisterMessageNotification(WM_HOTKEY, true);
	}
	
	var id = getRegisteredHotkeysLength()
	Debug.Trace("xxxx: " + key);
	if(Interop.Call("User32", "RegisterHotKey", _hotkeywnd.Handle, id, hibyte(key)&~8, lobyte(key))){
		//Debug.Trace(hibyte2modkey(hibyte(key))+' + '+lobyte2key(lobyte(key)));
		addEventListener("hotkey_" + id, id, func); 
	}else{
		Debug.Trace('Failed: ' + GetKeyName(key));
	}
	_hotkeys[key] = id;
}

function hotkeyGetKeyFromId(id){
	for(x in _hotkeys){
		if(_hotkeys[x] == id)return x;
	}

}

function getRegisteredHotkeysLength(){
	var num=0;
	for(x in _hotkeys){num++;}
	return num;
}

function unRegisterGlobalHotkey(key){

	if(typeof(_hotkeys[key]) != "undefined"){
		Interop.Call("User32", "UnregisterHotKey", _hotkeywnd.Handle, _hotkeys[key]);
		removeEventListener("hotkey_" + _hotkeys[key], "_main_");
		delete _hotkeys[key];
	}
	
	if(getRegisteredHotkeysLength == 0){
		_hotkeywnd.Close(0);
		_hotkeywnd = false;
	}

}

function unRegisterAllGlobalHotkeys(){
	for(x in _hotkeys){
		unRegisterGlobalHotkey(x);
	}
}


/* some misc functions by matty */

var HK_GETKEY = (WM_USER+2);
var HK_SETKEY = (WM_USER+1);

/*
	Name: 	GetKeyName
	Purpose:	Creates a readable string based on the numerical value of the hotkey
	Parameters:	uCode - The numerical value of the hotkey
	Return:	Readable string of the hotkey
*/
function GetKeyName(uCode){
	var ScanCode = Interop.Call('user32', 'MapVirtualKeyW', lobyte(uCode), 0);
	if(hibyte(uCode) & 8) ScanCode |= 0x100;
	var Text = Interop.Allocate(512);
	Interop.Call('user32', 'GetKeyNameTextW', ScanCode << 16, Text, 255);
	var Prefix = (hibyte(uCode) & 2 ? 'Ctrl + ' : '') + (hibyte(uCode) & 1 ? 'Shift + ' : '') + (hibyte(uCode) & 4 ? 'Alt + ' : '');
	return Prefix + Text.ReadString(0);
}


function lobyte(w){ return w & 0xff; }
function hibyte(w){ return w >> 8; }
function makeword(a,b){ return a | (b << 8); }