var form = null;
var position;
var cursor;
var currentURL = "";
var isListening = 0;
check();

window.setInterval("check();", 250);

chrome.extension.onConnect.addListener( function(port)
{
    port.onMessage.addListener(function (string)
    {
        if(string != "")
        {
            form.value = form.value.substring(0, position+1) + string + form.value.substring(cursor+1,form.value.length);
            form.setSelectionRange(position+1+string.length,position+1+string.length);
        }
    });
});

function keydown(event)
{
    if(event.which ==  32 && event.ctrlKey)
        parse(form.value);
}

function check()
{
    if(form == null)
    {
        form = document.getElementById("tickets_reply");
        if(form != null)
        {
            if(isListening)
                form.removeEventListener("keypress",keydown);
            form.addEventListener("keypress",keydown);
            isListening = 1;
        }
        currentURL = window.location.href;
    }
    if(window.location.href != currentURL)
    {
        form = null;
        isListening = 0;
    }
}

function parse(string)
{
    cursor = form.selectionStart;
    string = string.substring(0,cursor);
    position = Math.max(
    string.lastIndexOf("."),
    string.lastIndexOf("\n"),
    string.lastIndexOf("?"),
    string.lastIndexOf("!"));
    while(string[position+1] == ' ')
        position++;
    string = string.substring(position + 1,string.length);
    var port = chrome.runtime.connect();
    port.postMessage(string);
}