var SENDMAIL_SERVICE = "/sendmail/";
function AOLSendMail( formName )
{

    var form = $(formName);
    var sentcallback = null;
    var errorcallback = null;
    var datatoappend = null;
    var beforesendcallback = null;
    if( form.tagName.toLowerCase() == "form" )
    {
        form.onEvent("submit", function( e )
        {
            stopDefaultEvent(e);
            initSend();
        });
    }
    else if( form.tagName.toLowerCase() == "input" )
    {
        form.onEvent("click", function( e )
        {
            stopDefaultEvent(e);
            initSend();
        });
    }

    this.send = function()
    {
        initSend()
    }

    this.onMessageSent = function( callback )
    {
        sentcallback = callback;
    }
    this.onError = function( callback )
    {
        errorcallback = callback;
    }
    this.setDataToAppend = function( data )
    {
        datatoappend = data;
    }
    this.onBeforeSend = function( cb )
    {
        beforesendcallback = cb;
    }

    function initSend()
    {
        if( $("captcha_response") )
        {
            sendMail();
        }
        else
        {
            post(function( rs )
            {
                if( rs.error == "NO_ERROR" )
                {
                    sendMail()
                }
                else
                {
                    if( rs.error == "CAPTCHA_RESPONSE" || rs.error == "TOKEN_INVALID" || rs.error == "CAPTCHA_MISSING" )
                    {
                        showCaptcha();
                    }
                    else
                    {
                        if( errorcallback )
                        {
                            errorcallback(rs);
                        }
                    }
                }
            }, "validateUser=1")
        }
    }

    function sendMail()
    {
        if( beforesendcallback )
        {
            beforesendcallback();
        }
        var to = $("sendmail_to").value;
        var subject = $("sendmail_subject").value;
        var body = $("sendmail_body").value;
        if( datatoappend != null )
        {
            body += datatoappend;
        }
        var data = "sendmail_to=" + to + "&sendmail_subject=" + subject + "&sendmail_body=" + body;
        if( $("captcha_response") )
        {
            data += "&captcha_response=" + $("captcha_response").value;
        }
        post(function( rs )
        {
            if( rs.error == "CAPTCHA_RESPONSE" )
            {
                $("captcha_image").setAttribute("src", "/sendmail/captcha-image?" + Math.random());
            }
            if( rs.error == "NO_ERROR" )
            {
                if( sentcallback )
                {
                    sentcallback();
                }
            }
            else
            {
                if( errorcallback )
                {
                    errorcallback(rs);
                }
            }
        }, data);
    }


    function showCaptcha()
    {
        if( $("captcha_image") == null )
        {
            var container = $("captcha");
            var captcha = document.createElement("img");
            captcha.setAttribute("src", "/sendmail/captcha-image?" + Math.random());
            captcha.setAttribute("id", "captcha_image");
            container.appendChild(captcha);

            var label = document.createElement("label");
            label.style.width = "100%";
            var text = document.createTextNode("Please enter the letters that appear in the image above")
            var input = document.createElement("input");
            input.setAttribute("type", "text");
            input.setAttribute("name", "captcha_response");
            input.setAttribute("id", "captcha_response");

            label.appendChild(text);
            label.appendChild(input)
            container.appendChild(document.createElement("br"));
            container.appendChild(label);
        }
    }

    var XMLHttpFactories = [
            function ()
            {
                return new XMLHttpRequest()
            },
            function ()
            {
                return new ActiveXObject("Msxml2.XMLHTTP")
            },
            function ()
            {
                return new ActiveXObject("Msxml3.XMLHTTP")
            },
            function ()
            {
                return new ActiveXObject("Microsoft.XMLHTTP")
            }
            ];
    function createXMLHTTPObject()
    {
        var xmlhttp = false;
        for( var i = 0; i < XMLHttpFactories.length; i++ )
        {
            try
            {
                xmlhttp = XMLHttpFactories[i]();
            }
            catch ( e )
            {
                continue;
            }
            break;
        }
        return xmlhttp;
    }

    function post( callback, params )
    {
        var req = createXMLHTTPObject();
        req.open("POST", SENDMAIL_SERVICE + "sendmail", /*async*/true);
        req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        req.onreadystatechange = function ()
        {
            if( req.readyState == 4 /*complete*/ )
            {
                if( callback )
                {
                    var results = eval('(' + req.responseText + ')');
                    callback(results);
                }
            }
        };

        req.send(params);
    }
    function $( id )
    {
        var _elem = null;
        if( typeof id == "string" )
        {
            _elem = document.getElementById(id);
        }
        else
        {
            _elem = id;
        }

        if( _elem )
        {
            _elem.onEvent = function( event, fn )
            {
                if( this.addEventListener )
                {
                    this.addEventListener(event, fn, false);
                }
                else if( this.attachEvent )
                {
                    this.attachEvent("on" + event, fn);
                }
            }
        }
        return _elem;
    }

    function stopDefaultEvent( event )
    {
        if( event )
        {
            if( event.preventDefault )
            {
                event.preventDefault();
                event.stopPropagation();
            }
            else
            {
                event.returnValue = false;
                event.cancelBubble = true;
            }
        }
    }
}