var TabCompleter = function(element) {
    this.input = element;
};

TabCompleter.prototype = {
    input : null,
    tabInProgress : false,
    tabBase : null,
    lastHitIdx : -1,
    lastSpace : -1,
    matches: null,
    reset : function () {
        this.tabInProgress = false;
        this.tabBase = null;
        this.matches = null;
        this.lastHitIdx = -1;
        this.lastSpace = -1;
    }
};

TabCompleter.prototype.complete = function complete()
{
    var text = this.input.value;
    if (!(this.tabInProgress))
    {
        var lastWord;
        this.lastSpace = text.lastIndexOf(" ");
        
        if (text.length < 1) {
            return;
        }
        else if (this.lastSpace < 0) {
            lastWord = text;
        }
        else if (++(this.lastSpace) >= text.length) {
            return;
        }
        else {
            lastWord = text.substring(this.lastSpace);
        }
        if(lastWord.substr(0,1)=="/"){
		lastWord=lastWord.substr(1);	
	}
        this.tabBase = lastWord.toLowerCase();
        this.tabInProgress = true;
    }
    
    var users = $("a.notice",window.parent.document);
    
    if (this.lastHitIdx >= users.length) {
        this.reset();
        return;
    }
    
    for (var n = 0; n < users.length; n++)
    {
        i = (n + this.lastHitIdx + 1) % users.length;        
        
        if (users.eq(i).attr('id').toLowerCase().indexOf(this.tabBase) == 0)
        {
            if (this.lastSpace >= 1) {
                this.input.value = text.substring(0, this.lastSpace) + users.eq(i).attr('id');
            }
            else {
                this.input.value = users.eq(i).attr('id');
            }
            
            this.lastHitIdx = i;
            return; 
        }
    }
    
};