/*
    OmnomIRC COPYRIGHT 2010,2011 Netham45

    This file is part of OmnomIRC.

    OmnomIRC is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OmnomIRC is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with OmnomIRC.  If not, see <http://www.gnu.org/licenses/>.
*/
(function(window,undefined){
	var message = document.getElementById("message"),
		isInTab = false,
		tabWord = "",
		tabCount = 0,
		startPos = 0,
		endPos = 0,
		endPosO = 0;
	if(message.addEventListener ){
		message.addEventListener("keydown",keyHandler,false);
	} else if(message.attachEvent ){
		message.attachEvent("onkeydown",keyHandler);
	}
    function keyHandler(e){
		if (getCurrentWord() === "")
			return true;
        var TABKEY = 9;
        if(e.keyCode == TABKEY){
            if(e.preventDefault) {
                e.preventDefault();
            }
			tabWord = getCurrentWord();
			getTabComplete();
			tabCount++;
			isInTab = true;
			//setTimeout(1,1); //Who woulda thought that a bogus call makes it not parse it in FF4?
            return false;
        }else{
			tabWord = "";
			tabCount = 0;
			isInTab = false;
		}
    }
	function getCurrentWord(){
		if (isInTab){
			return tabWord;
		}
		startPos = message.selectionStart;
		endPos = message.selectionStart;
		var startChar = message.value.charAt(startPos);
		while (startChar != " " && --startPos > 0){
			startChar = message.value.charAt(startPos);
		}
		if (startChar == " ") startPos++;
		var endChar = message.value.charAt(endPos);
		while (endChar != " " && ++endPos <= message.value.length){
			endChar = message.value.charAt(endPos);
		}
		endPosO = endPos;		
		return message.value.substr(startPos,endPos - startPos).trim();
	}
	function getTabComplete(){		
		if (!isInTab){
			startPos = message.selectionStart;
			var startChar = message.value.charAt(startPos);
			while (startChar != " " && --startPos > 0){
				startChar = message.value.charAt(startPos);
			}
			if (startChar == " "){
				startChar+=2;
			}
			endPos = message.selectionStart;
			var endChar = message.value.charAt(endPos);
			while (endChar != " " && ++endPos <= message.value.length){
				endChar = message.value.charAt(endPos);
			}
			if (endChar == " "){
				endChar-=2;
			}
		}
		var name = searchUser(getCurrentWord(),tabCount);
		if (name == getCurrentWord()){
			tabCount = 0;
			name = searchUser(getCurrentWord(),tabCount);
		}
		message.value = message.value.substr(0,startPos) + name + message.value.substr(endPos + 1);
		endPos = endPosO + name.length;
	}
})(window);