var progress;
var progressTimer;
var canceled = 0;
function startEmbeddedProgressBar(form) {
    progress = {};
    progress.id         = generateProgressID();
    if (form.action.match(/\?/))
        form.action += '&progress_id=' + progress.id;
    else
        form.action += '?progress_id=' + progress.id;
    progress.starttime  = new Date();
    progress.lasttime   = new Date(progress.starttime);
    progress.lastamount = 0;
    progressTimer = window.setTimeout( reportUploadProgress, 500 );
	canceled = 0;
    return true;
}

function updateProgressBar(progress) {

    if (progress.received == progress.size)
        progress.finished = 1;

    // Only calculate rates and times is we were given a starttime
    if (progress.starttime) {
        var currenttime = new Date();
        var totalelapsedtime = ( currenttime.getTime() - progress.starttime.getTime() ) / 1000;
        var lastelapsedtime  = ( currenttime.getTime() - progress.lasttime.getTime() ) / 1000;

        progress.elapsedtime = totalelapsedtime;

        if (totalelapsedtime != 0)
            progress.rate = parseInt( progress.received / totalelapsedtime );
        else
            progress.rate = 0;

        if (lastelapsedtime != 0)
            progress.currentrate = parseInt( (progress.received - progress.lastamount) / lastelapsedtime );
        else
            progress.currentrate = 0

        if (progress.currentrate != 0)
            progress.remainingtime = parseInt( (progress.size - progress.received) / progress.rate );
        else
            progress.remainingtime = '';

        progress.currentrate   = formatBytes(progress.currentrate);
        progress.rate          = formatBytes(progress.rate);
        progress.elapsedtime   = formatTime(progress.elapsedtime);
        progress.remainingtime = formatTime(progress.remainingtime);
    }

    if (progress.size != 0)
        progress.percent = Math.round(progress.received / progress.size * 100);

    progress.size     = formatBytes(progress.size);
    progress.received = formatBytes(progress.received);
    updateProgressHTML(progress);
}

function reportUploadProgress() {
	if(canceled){return;};
	url = '/ajax/progress?progress_id=' + progress.id;
    var req ;
	if (window.XMLHttpRequest)
  {// code for all new browsers
  req=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {// code for IE5 and IE6
  req=new ActiveXObject("Microsoft.XMLHTTP");
  }else{
	  alert("Your browser does not support XMLHTTP.");
	  return;
  }
    req.open('GET', url, Boolean(handleUploadProgressResults));
    // We have to set the qvalue to 1.1 because Konqueror sends
    // it's standard Accept header with our header tacked on the end
    // which means that text/html gets picked first
    req.setRequestHeader(
        'Accept', 
        'text/x-json; q=1.1'
    );
    req.onreadystatechange = function() {
        if (req.readyState == 4)
            if (req.status == 200)
                handleUploadProgressResults(req.responseText);
            else
                // If there was an error, try again in 4 seconds
               progressTimer=window.setTimeout( reportUploadProgress, 4000 );
    };
    req.send(null);
}

function handleUploadProgressResults(results) {

    var state = JSON.parse(results);

    if ( state != undefined ) {

        state.starttime       = progress.starttime;
        state.lasttime        = progress.lasttime;
        state.lastamount      = progress.lastamount;

        progress.lasttime     = new Date();
        progress.lastamount   = state.received;
        progress.size         = state.size;
        progress.received     = state.received;

        if ( progress.received != progress.size && !state.aborted ) {
            progressTimer=window.setTimeout( reportUploadProgress, 1000 );
        }

        updateProgressBar(state);
    }
}

function formatTime(time) {
    var seconds = Math.round(time);
    var minutes = 0;
    if (time >= 60) {
        minutes = Math.round(seconds / 60);
        seconds %= 60;
    }
    if (seconds < 10)
        seconds = '0' + seconds;

    return minutes + ':' + seconds;
}

function formatBytes(bytes, precision) {
    if ( typeof(precision) != 'number')
        precision = 2;
    var suffix = '';

    // Only positive values are allowed
    if (bytes <= 0)
        return bytes;

    if (bytes > 1073741824) {
        bytes /= 1073741824;
        suffix = 'G';
    } else if (bytes > 1048576) {
        bytes /= 1048576;
        suffix = 'M';
    } else if (bytes > 1024) {
        bytes /= 1024;
        suffix = 'K';
    }

    return formatNumber(bytes, precision) + suffix;
}

function formatNumber(number, precision) {
    if ( typeof(precision) != 'number')
        precision = 2;
    var num = new Number(number);
    return num.toFixed(precision)
}

var alpha = "0123456789abcdef";

function generateProgressID() {
    var id = '';
    for(var i=0; i < 32; i++) {
        id += alpha.charAt(Math.round(Math.random()*14));
    }
    return id;
}




//------------------------------------------------------------------------------
// JSON Support
//------------------------------------------------------------------------------

/*
Copyright (c) 2005 JSON.org
*/
var JSON = function () {
    var m = {
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        },
        s = {
            'boolean': function (x) {
                return String(x);
            },
            number: function (x) {
                return isFinite(x) ? String(x) : 'null';
            },
            string: function (x) {
                if (/["\\\x00-\x1f]/.test(x)) {
                    x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
                        var c = m[b];
                        if (c) {
                            return c;
                        }
                        c = b.charCodeAt();
                        return '\\u00' +
                            Math.floor(c / 16).toString(16) +
                            (c % 16).toString(16);
                    });
                }
                return '"' + x + '"';
            },
            object: function (x) {
                if (x) {
                    var a = [], b, f, i, l, v;
                    if (x instanceof Array) {
                        a[0] = '[';
                        l = x.length;
                        for (i = 0; i < l; i += 1) {
                            v = x[i];
                            f = s[typeof v];
                            if (f) {
                                v = f(v);
                                if (typeof v == 'string') {
                                    if (b) {
                                        a[a.length] = ',';
                                    }
                                    a[a.length] = v;
                                    b = true;
                                }
                            }
                        }
                        a[a.length] = ']';
                    } else if (x instanceof Object) {
                        a[0] = '{';
                        for (i in x) {
                            v = x[i];
                            f = s[typeof v];
                            if (f) {
                                v = f(v);
                                if (typeof v == 'string') {
                                    if (b) {
                                        a[a.length] = ',';
                                    }
                                    a.push(s.string(i), ':', v);
                                    b = true;
                                }
                            }
                        }
                        a[a.length] = '}';
                    } else {
                        return;
                    }
                    return a.join('');
                }
                return 'null';
            }
        };
    return {
        copyright: '(c)2005 JSON.org',
        license: 'http://www.crockford.com/JSON/license.html',
        stringify: function (v) {
            var f = s[typeof v];
            if (f) {
                v = f(v);
                if (typeof v == 'string') {
                    return v;
                }
            }
            return null;
        },
        parse: function (text) {
            try {
                return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
                        text.replace(/"(\\.|[^"\\])*"/g, ''))) &&
                    eval('(' + text + ')');
            } catch (e) {
                return false;
            }
        }
    };
}();

var last_progress = 0;