#include "page.h"

Page::Page() { dateHeader = "";}
/**
 * @brief Page::getString
 * @param htmlToPhrased
 * @return
 */
QString Page::getString(QString &htmlToParse)
{
  makeText(htmlToParse);
  return this->text;
}
void Page::makeText(QString &html)
{
  int index = 0;
  index = html.indexOf("<tbody>",0); //set index into the place where the data is
  manageTableContent(html, index);
}
/**
 * @brief Page::manageTableContent strip html, make it string
 * @param html html to parse
 * @param index index to start looking for data
 */
void Page::manageTableContent(QString &html, int index)
{
  if (index == -1)
    return;
  QString temp;
  for (int i = index; i < html.length(); i++)
    {
      if (html.at(i) == '<')
        {
          //<tr> / <td> / <th>
          QString endofTable = "</tbody>";
          QString tableTag = html.mid(i, 4); //legth of "tr/td"
          if (tableTag == "<tr>")
            {
              if (!dateHeader.isEmpty())
                temp += dateHeader;
              i = stitchText(html, temp, i+4);
              if (i == -1) //EOF
                break;

            }
          else if (tableTag == "</tr")
            {
              temp += "\n"; //end row -> new line
              i+=5;
            }
          else if (tableTag == "<td>" || tableTag == "<th>")
            {
              if (!dateHeader.isEmpty())
                temp += "\t"; // new cell -> tab between data
              if (html.mid(i, 6) == "<td><a") //link to lecturer portal, need to be deleted
                {
                  i += 6;
                  while (html.at(++i) != '>');
                  i = stitchText(html, temp, i+1);
                }
              else
                i = stitchText(html, temp, i+4);

              if (dateHeader.isEmpty())
                temp += "\t";

              if (i == -1) //EOF
                break;
            }
          else if (tableTag == "<td ") // a Year title (in grades table) or Day and Hour (in calendar page)
            {

              if (!dateHeader.isEmpty())
                {
                  //checking if theres a need to fill a timestamp of course
                  //if the string is not empty, then we will chop the last date stamp to avoid multiple date stamp in empty rows
                  if (!temp.isEmpty())
                    if (temp.lastIndexOf(dateHeader) == temp.length()-dateHeader.length())
                      {
                        temp.chop(dateHeader.length()+5);
                        temp += "\t";
                      }
                }
              while ((html.mid(i,5) != "</td>") && (i < (int)html.length()))
                {
                  if (html.mid(i,3) == "<b>") //for gpa. year & semester  title
                    {
                      break;
                    }
                  else if ((html.at(i) == '>') && (html.mid(i+4,3) != "<b>")) //for calendar. day and hours
                    {
                      i += 1; //lenght of >
                      break;
                    }
                  i++;
                }
              i = stitchText(html, temp, i);
              temp += "\t";
            }
          if (html.mid(i,(endofTable).length()) == endofTable) //is end of table
            {
              break;
            }
        }

    }

  this->text = temp;
}

int Page::stitchText(QString &from, QString &to, int index)
{
  if (from.mid(index,3) == "<b>")
    {
      QString bTag = from.mid(index, 3);
      QString dateline = from.mid(index,from.indexOf("</b>",index+4)-index);
      QString temp;
      QString date;
      char* tok;
      int i =  0;
      char* textToTok = strdup(dateline.toStdString().c_str());
      tok = strtok(textToTok,"<>&nbsp;:");
      while (tok != NULL)
        {
          if (i == 1)
            {
              temp = tok;
              date += temp + "\t";
            }
          else if (i == 3)
            {
              temp = tok;
              date += temp;
            }
          i++;
          tok = strtok(NULL, "<>&nbsp;:");
        }
      dateHeader = date;
      if (bTag != "<b>")
        return index-1; //go back one step - for the main function to inc i
      index += dateline.length();
    }

  while (from.at(index) != '<' && index < (int)from.length())
    {
      if (from[index] == '&')
        {
          //&nbsp;
          QString nbspChr = from.mid(index, 6);
          if (nbspChr == "&nbsp;")
            {
              index += 5;
              from.replace(index,1,' ');
            }

        }

      if (endOfString(index,(int) from.length()))
        return -1; //EOF

      else if (from.at(index) == '<')
        return index - 1; //go back one step - for the main function to inc i

      if ((from.at(index) != '\n') && (from.at(index) != '\t')) //check the actuall data before continue
        to += from.at(index);
      index++;
    }

  return index-1;
}
bool Page::endOfString(int index, int length)
{
  if(index < length)
    return false;
  return true;
}