/************************************************************
upload_form.js - Function to implement JSON requested AJAX upload.
Copyright (C) 2006  Jeremy Nicoll

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Please see lgpl.txt for a copy of the license - this notice and the file 
lgpl.txt must accompany this code.

Please go to www.SeeMySites.net/forum for questions and support.
***************************************************************/

//This function takes two paramaters: form (the ID of the form), and sid, which 
//differentiates the different uploads from each other.
var ul_vars = {
  interval : 3000, //The time in milleseconds between each status request.
  speeds : []      //Keeps track of the speeds of each upload.
};

function uploadForm(form, sid) {
  var theForm = $(form);
  // The variable request is an object that will contain details of the request.
  var request = {};
  var fileName = '';
  var emailAddress = '';
  var emailAddressEle = null;
  var copyrights = false;
  
  // This little bit loops through all the elements in the form, locates the
  // file input field, and extracts the file name of the file being uploaded.
  for (var i=0; i < theForm.elements.length; i++) { 

    ele = theForm.elements[i];
    if (ele.type == 'file') {
      var fileName = ele.value;
    	if (fileName.indexOf('/') > -1) { 
    	  fileName = fileName.substring(fileName.lastIndexOf('/')+1, fileName.length);
      }	else {
    	  fileName = fileName.substring(fileName.lastIndexOf('\\')+1, fileName.length);
      }
      //Since there can only be one file per form for this script, we'll exit the loop here. 
      //break;
    }

    if (ele.type == 'text') {
      var emailAddressEle = ele;
      var emailAddress = ele.value;
    }

    if (ele.type == 'checkbox') {
      var copyrights = ele.checked;
    }

  }

  if (fileName.replace('/\s/', '').toString() === '') {return;}

  // validate email address
  var errorEmailEle = document.getElementById('errorEmail');
  if( errorEmailEle ){
    if ( emailAddress.indexOf(".") > 2 && emailAddress.indexOf("@") > 0 ) {
      errorEmailEle.style.display='none';
    } else {
      errorEmailEle.style.display='inline';
      theForm.reset();
      return;
    }
  }

  // validate copyright
  var errorPermissionEle = document.getElementById('errorPermission');
  if( errorPermissionEle ){
    if ( copyrights == true ) {
      errorPermissionEle.style.display='none';
    } else {
      errorPermissionEle.style.display='inline';
      theForm.reset();
      if( emailAddressEle ){
        emailAddressEle.value = emailAddress;
      }
      return;
    }
  }

  theForm.submit();

  var ele;
    
  //These three parts of 'request' are required in order for the filestatus server-side script to work.
  request.sid = sid;
  request.fileName = fileName;
  request.emailAddress = emailAddress;
  request.copyrights = copyrights;
  request.iframe = theForm.target;
  request.starttime = 0;
  
  // I hope this is self explanatory, but if not, this will send a JSON request to filestatus.php
  // every 3 seconds.  RepeatGetAction is in SendRecieve.js or sr_c.js.  If a single call is
  // successful, the successFunc will be called. Otherwise, failFunc will be called.  
   
  repeater = new RepeatGetAction('/uploader/filestatus.php', request, ul_vars.interval);
  repeater.successFunc = function (getBack) {


    //if ( getBack.progress >= 95 ) {
    //  alert( getBack.progress );
    //}

    if (getBack.progress >= 100 || getBack.progress=='done') {
      getBack.progress = 100;

      //alert( getBack.progress + ' Finished');

      var finishedId = 'finished' + getBack.iframe;
      var finishedFileName = document.getElementById( finishedId );
      finishedFileName.value = getBack.srcfilename;
      if( finishedFileName.style ) { finishedFileName = finishedFileName.style; }
      finishedFileName.bgColor = '#ddffdd';
      finishedFileName.background = '#ddffdd';
      finishedFileName.backgroundColor = '#ddffdd';

      var itemNumberId = 'itemnumber' + getBack.iframe;
      var itemNumberFileName = document.getElementById( itemNumberId );
      itemNumberFileName.value = getBack.dstfilename;

      this.stop();

      theForm.reset();

    }

    if (!ul_vars.speeds[getBack.sid]) {ul_vars.speeds[getBack.sid] = [];}
    else if (ul_vars.speeds[getBack.sid].length == 3) {ul_vars.speeds[getBack.sid].shift();}

    if (getBack.starttime > 0) {
      request.starttime = getBack.starttime;
    }

    request.emailAddress = getBack.emailAddress;
    request.copyrights = getBack.copyrights;
    
    ul_vars.speeds[getBack.sid].push(getBack.current_size);
    ul_vars.speeds[getBack.sid].sort(function(a, b) {return a - b;});  //Sorts numerically instead of by string. 
    
    var bytes_sec = 0;
    var bytes_append = 'B/sec';
    if (ul_vars.speeds[getBack.sid].length == 3) {
      var dif = ul_vars.speeds[getBack.sid][2]  - ul_vars.speeds[getBack.sid][0];
      bytes_sec = dif / ((ul_vars.interval / 1000) * 3);
      if (bytes_sec > 1024) {
        bytes_sec = bytes_sec / 1024;
        bytes_append = 'KB/sec';
      } 
    }
    //Due to a stupid IE bug, this has been changed...
    //$(getBack.sid + '_progress').style.width = getBack.progress + '%';
    $(getBack.sid+'_progress').style.width = (getBack.progress / 10)  + 'em';
    $(getBack.sid+'_progress').style.height = '10px';

    $(getBack.sid + '_fileName').innerHTML = bytes_sec.toFixed(2) + ' ' + bytes_append;
    //$(getBack.sid + '_fileName').innerHTML = fileName;
  }; 
  repeater.failFunc = function (getBack) {
    this.stop();
    $(getBack.iframe).src = 'blank.html';
    alert(getBack.error_msg);
  };
  
  // This MUST be called before the action will start.  When the repeater has served its 
  // purpose (or you get sick of it), you can call repeater.stop() to stop it.
  repeater.start();
}