/*
   name - name of the cookie
   value - value of the cookie
   [expires] - expiration date of the cookie
     (defaults to end of current session)
   [path] - path for which the cookie is valid
     (defaults to path of calling document)
   [domain] - domain for which the cookie is valid
     (defaults to domain of calling document)
   [secure] - Boolean value indicating if the cookie transmission requires
     a secure transmission
   * an argument defaults when it is assigned null as a placeholder
   * a null placeholder is not required for trailing omitted arguments
*/

function setCookie(name, value, expires, path, domain, secure) {

  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toGMTString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");

  document.cookie = curCookie;
}


/*
  name - name of the desired cookie
  return string containing value of specified cookie or null
  if cookie does not exist
*/

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}


/*
   name - name of the cookie
   [path] - path of the cookie (must be same as path used to create cookie)
   [domain] - domain of the cookie (must be same as domain used to
     create cookie)
   path and domain default if assigned null or omitted if no explicit
     argument proceeds
*/

function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

// date - any instance of the Date object
// * hand all instances of the Date object to this function for "repairs"

function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}

function answer(sentence, score, bcolora, colora){
    this.sentence = sentence;
    this.score = score;
    this.bcolora = bcolora;
    this.colora = colora;
}

/* create the poll the constuction depend of
   wether the user has given its answer or not
   @question a string for the poll question
   @answers an array of answer object
*/
function create_poll(question, answers){
     if(getCookie("has_voted")=="yes"){
        construct_chart(question, answers);
     }else{
        construct_form(question, answers);
     }
}

/* construct the chart horizontally  */
function construct_chart(question, answers){
   //the with of the chart
   max_width = 120;
   //first we put the question
   document.write("<div class='poll_question'>"+question+"</div>");
   //then we must get the total of answer and the max value to get the best ratio
   maxo = 0;
   total = 0;
   for (i=0; i<answers.length; i++){
        total += answers[i].score;
        maxo = (answers[i].score > maxo) ? answers[i].score : maxo;
   }
   ratio = max_width / maxo;
   //now we construct the chart
   for (i=0; i<answers.length; i++){
       document.write("<div class='poll_answer'>"+answers[i].sentence+"</div>");
       percent = answers[i].score/total;
       document.write("<div class='poll_answer' style='width: "+Math.floor(answers[i].score * ratio)+"px; background-color: "+answers[i].bcolora+"; color: "+answers[i].colora+"'>"+Math.floor(percent*100)+"%</div>");
   }
   document.write("<div class='poll_total'>Pour un total de "+total+" réponses</div>");
}

/* construct the form  */
function construct_form(question, answers){
   //the with of the chart
   max_width = 120;
   //first we put the question
   document.write("<form action='#' onsubmit='setHas_voted()'>");
   //document.write("<form action='#'>");
   document.write("<div class='poll_question'>"+question+"</div>");
   //now we construct the form
   for (i=0; i<answers.length; i++){
       document.write("<div class='poll_answer'><input type='radio' name='answer' value='"+i+"'>&nbsp;&nbsp;<label for='answer'>"+ answers[i].sentence + "</label></div>");
   }
   document.write("<div class='poll_total'><input type='submit' value='voter'></div>");
   document.write("</form>");
}

function setHas_voted(){
  var now = new Date();
  fixDate(now);
  now.setTime(now.getTime() + 30 * 24 * 60 * 60 );
  setCookie("has_voted", "yes" ,now);
}