/*

 * Copyright 2010 Nathan Gelderloos, Ethan Zonca, Nathan Phillip Brink

 *

 * This file is part of SlatePermutate.

 *

 * SlatePermutate is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Affero General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * SlatePermutate 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 Affero General Public License for more details.

 *

 * You should have received a copy of the GNU Affero General Public License

 * along with SlatePermutate.  If not, see <http://www.gnu.org/licenses/>.

 */

$incdir = dirname(__FILE__) . DIRECTORY_SEPARATOR;

include_once $incdir . 'class.course.inc';

include_once $incdir . 'class.section.php';

include_once $incdir . 'class.page.php';

require_once $incdir . 'school.inc';

/*

 * Load a Classes -> Course converter class for the sake of the

 * Schedule::__wakeup() magic function.

 */

require_once $incdir . 'class.classes_convert.inc';

/**

 * \brief

 *   Finds possible Section combinations for a user's given Courses

 *   and stores and displays the results.

 *

  /**

   * \brief

   *   Adds a section to this semester after finding the class.

   *

   * \param $instructor

   *   The instructor of this section/section_meeting.

   *

   * \return

   *   NULL on success, a string on error which is a message for the

   *   user and a valid XHTML fragment.

   */

  {

    if (empty($letter) && (empty($time_start) || !strcmp($time_start, 'none')) && (empty($time_end) || !strcmp($time_end, 'none')) && empty($days)

	&& empty($synonym) && empty($instructor) && empty($location) && (empty($type) || !strcmp($type, 'lecture'))

	&& (empty($slot) || !strcmp($slot, 'default')))

      return;

    /* reject invalid times */

    if (!strcmp($time_start, 'none') || !strcmp($time_end, 'none')

	|| $time_start > $time_end)

      {

	return 'Invalid time specifications for ' . htmlentities($course_name) . '-' . htmlentities($letter)

	  . '. Start time: <tt>' . htmlentities($time_start) . '</tt>. End time: <tt>' . htmlentities($time_end) . '</tt>.';

      }

    foreach ($this->courses as $course)

      if (!strcmp($course_name, $course->getName()))

	{

	  $section = $course->section_get($letter);

	  if (!$section)

	    {

	      $course->section_add($section, $slot);

	    }

	  $section->meeting_add(new SectionMeeting($days, $time_start, $time_end, $location, $type, $instructor));

	  return;

	}

    error_log('Could not find class when parsing schedule from postData: ' . $course_name);

    echo 'Could not find class: ' . $course_name . "<br />\n";

  }

  /**

	  . '          the information you enter correctly.' . PHP_EOL

	  . '        </em>' . PHP_EOL

	  . '      </p>' . PHP_EOL

	  . '    </div>' . PHP_EOL;

	echo '<div id="tabs">' . "\n" .

               '<div id="show-box" class="show-buttons">

                  <form action="#"><p class="nospace">

                    <label><strong>Display:</strong></label>

                    <input id="show-course-title" name="show-course-title" type="checkbox" /><label for="show-course-title">Course Title</label>

                    <input id="show-prof" name="show-prof" type="checkbox" checked="checked" /><label for="show-prof">Professor</label>

                    <input id="show-location" name="show-location" type="checkbox" /><label for="show-location">Room</label>

                    <input id="show-synonym" name="show-synonym" type="checkbox" /><label for="show-synonym">Synonym</label>

                    <span id="regCodes"><label><a href="#"><strong>Register for Classes</strong></a></label></span></p>

                  </form>

                </div> <!-- id="show-box" -->'

	     . '<div id="the-tabs"><ul>' . "\n";

	$suppressed_permutations = array();

	if (!empty($_REQUEST['print']))

	  {

	    $print = $_REQUEST['print'];

	    if ($print !== 'all')

	      {

		for ($i = $first_permutation; $i <= $last_permutation; $i ++)

	     */

	    if (!empty($suppressed_permutations[$i]))

	      continue;

	    /*

	     * Store a JSON list of courses, each with only the one

	     * section rendered in this permutation. This is used for

	     * the ``Registration Numbers'' dialog which noramlly

	     * shows users course synonyms.

	     */

	    $permutation_courses = array();

	     echo  '      <div class="section" id="tabs-' . ($i+1) . "\">\n";

	    // Beginning of table

	    echo "        <table style=\"empty-cells:show;\" border=\"1\" cellspacing=\"0\">\n";

	    // Header row

	    echo "          <tr>\n"

	      . '            <td class="none permuteNum">' . ($i + 1) . "</td>\n"

	      . "            <td class=\"day\">Monday</td>\n"

	      . "            <td class=\"day\">Tuesday</td>\n"

	      . "            <td class=\"day\">Wednesday</td>\n"

	      . "            <td class=\"day\">Thursday</td>\n"

				      $title = $course->title_get();

				      if (empty($title))

					$title = '';

				      else

					$title .= ' ';

				      $carret = '&#013;' . htmlentities("<br />");

				      echo '            <td rowspan="' . $rowspan[$dayLoop]

					. '" class="qTipCell ' . $single_multi . ' class' . $j

					. '" title="' . htmlentities($title, ENT_QUOTES) . $carret

					. 'Prof: ' . htmlentities($current_meeting->instructor_get(), ENT_QUOTES) . $carret

					. 'Room: ' . htmlentities($current_meeting->getLocation(), ENT_QUOTES) . $carret

					. '<span class="course-title block">' . htmlentities($title) . '</span>' . PHP_EOL

					. htmlentities($course->getName(), ENT_QUOTES) . '-'

					. htmlentities($section->getLetter(), ENT_QUOTES) . "\n"

					. '<span class="prof block">' . htmlentities($current_meeting->instructor_get(), ENT_QUOTES) . "</span>\n"

					. '<span class="location block">' . htmlentities($current_meeting->getLocation(), ENT_QUOTES) . "</span>\n"

					. '<span class="synonym block">' . htmlentities($section->getSynonym(), ENT_QUOTES) . "</span>\n"

					. "</td>\n";

				      /* for the ``Registration Codes'' dialogue: */

				      if (empty($permutations_courses[$j]))

					{

					  $singleton_course = new Course($course->getName(), $course->title_get());

					  $singleton_course->section_add($section, $course_slot->id_get());

					  $permutation_courses[$j] = $singleton_course->to_json_array();

					}

				      $filled = TRUE;

				    }

			if(!$filled)

			{

				echo "            <td class=\"none\">&nbsp;</td>\n";

			}

			$filled = FALSE;

		}

		// End of row

		echo "          </tr>\n";

	      }

	    // End of table

              . '         <span class="course-data">'.  htmlentities(json_encode($permutation_courses)) . "</span>\n"

	      . '      </div> <!-- id="section' . ($i + 1) . "\" -->\n";

	  }

          echo "    </div> <!-- class=\"scontent\" -->\n"

	     . "  </div> <!-- class=\"scroller\" -->\n"

	     . "</div> <!-- id=\"my-glider\" -->\n"

	     . $footcloser; // Closes off the content div

      } else {

      echo '<html><body><p>There are no possible schedules. Please <a href="input.php?s='.$this->id.'">try again</a>.</p></body></html>';

    }

 */

class Section

{

  private $letter;	// Section letter

  private $prof;	// Professor, preserved for Section::__wakeup()

  /* meeting times, array of SectionMeeting */

  private $meetings;

  /* the section synonym which uniquely identifies this section/course combination */

  private $synonym;

  /**

   * \brief

   *   Construct a Section.

   *

   * \param $letter

   *   The identifier (often a letter or numeral) of this section. For

   *   CS-262-A, this would be 'a'.

   * \param $section_meetings

   *   An array of SectionMeeting objects which describe all the

   *   different types of meetings this particular section has. It

   *   will be very uncommon for a course to have more than one such

   *   meeting time for a section. For example, Calvin doesn't have

   *   this. Another example, Cedarville lists different meeting times

   *   inside of a single section. Cedarville also lists all lectures

   *   and lab meeting times directly in a section's listing.

   * \param $synonym

   *   Some schools have a unique number for each section. This field

   *   is for that number.

   */

  {

    $this->letter = $letter;

    $this->meetings = $section_meetings;

    $this->synonym = $synonym;

  }

  public function getLetter()

  {

    return $this->letter;

  }

  /**

   * \return

   *   This section's synonym -- a unique numeric identifier for this

   *   course. NULL if undefined.

   */

   *   Get an array of section meetings for this section.

   *

   * \return

   *   An array of SectionMeeting objects.

   */

  public function getMeetings()

  {

    return $this->meetings;

  }

  /**

   * \brief

   *   Check if this section conflicts with the given section.

   *

   * \param $that

   *   The other section for which I should check for conflicts.

   * \return

   *   TRUE if there is a conflict, FALSE otherwise.

   */

  public function conflictsWith(Section $that)

  {

    foreach ($this->meetings as $this_meeting)

      foreach ($that->meetings as $that_meeting)

      if ($this_meeting->conflictsWith($that_meeting))

   *   Get arrays of information needed by the AJAX stuff.

   *

   * \return

   *   An array of arrays that should be merged with the return value

   *   of other Section::to_json_arrays() calls.

   */

  public function to_json_arrays()

  {

    $json_arrays = array();

    foreach ($this->meetings as $meeting)

      {

			    'synonym' => $this->synonym,

			    );

	$json_array += $meeting->to_json_array();

	$json_arrays[] = $json_array;

      }

    return $json_arrays;

  }

  /**

   * \brief

   * \return

   *   A Section object.

   */

  public static function from_json_arrays(array $json_arrays)

  {

    $section_meetings = array();

    $letter = '';

    $synonym = NULL;

    foreach ($json_arrays as $meeting)

      {

	$letter = $meeting['section'];

	$synonym = $meeting['synonym'];

	$section_meetings[] = SectionMeeting::from_json_array($meeting);

      }

    return $section;

  }

  /* for legacy unserialization */

  private $start;

  private $tend;

  private $bdays;

  /**

   * \brief

   *   A magic function which tries to upgrade old serialized sections

	/*

	 * if we're reserialized in the future, make sure we don't do this same upgrade procedure again ;-).

	 */

	unset($this->start);

      }

    elseif (!empty($this->prof))

      {

	/* Move the instructor (old $this->prof) property to our SectionMeeting children */

	foreach ($this->meetings as $meeting)

	  $meeting->instructor_set($this->prof);

	unset($this->prof);

      }

  }

}

   *   NULL.

   *   belongs to.

   * \param $section

   *   The letter or numbers which make up the section's name.

   * \param $synonym

   *   The section synonym or NULL.

   * \param $section_meeting

   *   The SectionMeeting to be added to a section which may or may

   *   not already be in this Semester.

   * \param $course_slot_id

   *   The name of the new CourseSlot to create if the given section

   *   does not yet exist.

   */

  {

    $dept = strtoupper($dept);

    $course = strtoupper($course);

    if (empty($this->departments[$dept][$course]))

      $course_obj = NULL;

    else

      {

	$course_obj = $this->departments[$dept][$course];

	$section_obj = $course_obj->section_get($section);

      }

    if (empty($course_obj) || empty($section_obj))

    $section_obj->meeting_add($section_meeting);

    return;

  }

  /**

   * \brief

   *   Update the time_end.

   *

   * The time_end is a unix timestamp roughly estimating the time at

   * which a semester starts. It is used when guessing what semester a

   * user is interested in.

      $i = 0;

      foreach ($values as $value)

        {

          $val = $val * $i / ($i + 1)

            + $value / ($i + 1);

          $i ++;

        }

      return $val;

    }

  }

if (!function_exists('stddev'))

  {

    function stddev(array $values)

    {

      $mean = mean($values);

      $squares = 0;

      $i = 0;

      foreach ($values as $value)

        $squares += pow($mean - $value, 2);

      return sqrt($squares / (count($values) - 1));

    }

	    $my_hc .= '    class_last = add_class_n(' . json_encode($course['name']) . ', ' . json_encode($title) . ');' . PHP_EOL;

	  foreach ($course as $section)

	    if (is_array($section))

	      $my_hc .= '    add_section_n(class_last, ' . json_encode($section['letter']) . ', '

		. json_encode($section['synonym']) . ', ' . json_encode($section['start']) . ', '

		. json_encode($section['end']) . ', '

		. json_encode(array('m' => !empty($section['days'][0]), 't' => !empty($section['days'][1]), 'w' => !empty($section['days'][2]),

				    'h' => !empty($section['days'][3]), 'f' => !empty($section['days'][4]),

				    's' => !empty($section['days'][5])))

		. ', ' . json_encode($section['professor']) . ', '

		. json_encode($section['location']) . ', '

		. json_encode($section['type']) . ', '

	  $my_hc .= PHP_EOL;

	}

  }

else

  {

    $default_courses = school_default_courses($school);

    foreach ($default_courses as $default_class)

      $my_hc .= input_course_js($default_class, '    ');

  }

$my_hc .= '    class_last = add_class();' . PHP_EOL;

if ($qtips_always || !isset($_SESSION['saw_qtips']))

  {

          <td class="center">W</td>

          <td class="center">Th</td>

          <td class="center">F</td>

	  <td class="center">S</td>

          <td class="center"></td>

          <td class="center"></td>

        </tr>

      </table>

    </td>

  </tr>

</table>

<div class="paddingtop">

  <input class="button olive" type="submit" value="Find a schedule" />

</div>

</form>

<?php 

/* Show/hide Advanced Options: <p><span id="showadvanced" style="margin-left: 1em;"><a href="#">Advanced</a></span></p> */ 

?>

<div id="showInstructions" style="width: 100%; text-align: center;"><a href="#">Detailed Instructions...</a></div>

	$meetings = $section->getMeetings();

      foreach ($meetings as $meeting)

	{

	  $js .= $whitespace . 'add_section_n(class_last, ' . json_encode($section->getLetter()) . ', '

	    . json_encode($section->getSynonym()) . ', '

	    . json_encode($meeting->getStartTime()) . ', '

	    . json_encode($meeting->getEndTime()) . ', '

	    . json_encode(array('m' => $meeting->getDay(0), 't' => $meeting->getDay(1), 'w' => $meeting->getDay(2), 'h' => $meeting->getDay(3), 'f' => $meeting->getDay(4),

				's' => $meeting->getDay(5))) . ', '

	    . json_encode($meeting->instructor_get()) . ', '

	    . json_encode($meeting->getLocation()) . ', '

	    . json_encode($meeting->type_get()) . ', '

	}

    }

  return $js;

}

	  {

	    /*

	     * Only add classes if the user added at least one

	     * section to the class. We know that $course['name']

	     * is not a section, so count() needs to be > 1 and

	     * we need to skip over 'name' in our loop.

	     */

	    if(is_array($course) && count($course) > 1)

	      {

		if (empty($course['title']))

		  $course['title'] = '';

		$allClasses->addCourse($course['name'], $course['title']);

				foreach($course as $section)

				  /* Skip the section name, which isn't a section */

					if(is_array($section))

					  {

					    if (empty($section['slot']))

					      $section['slot'] = 'default';

					    if ($error_string !== NULL)

					      $errors[] = $error_string;

					  }

			}

		}

		/*

		 * Tell the user that his input is erroneous and

		 * require him to fix it.

		 */

		if (count($errors))

		  {

	  /* e.g., 'Lecture', 'Practicum' */

	  $meeting_type = school_crawl_meeting_type($meeting_info_matches[3]);

	  $days = school_crawl_days_format($school_crawl_log, explode(', ', $meeting_info_matches[5]));

	  $time_start = school_crawl_time_format(strptime($meeting_info_matches[6], '%I:%M%p'));

	  $time_end = school_crawl_time_format(strptime($meeting_info_matches[7], '%I:%M%p'));

	  $meeting_place = $meeting_info_matches[8];

	  foreach (array('date_start', 'date_end', 'meeting_type', 'days', 'time_start', 'time_end', 'meeting_place', 'meeting_type') as $var)

	    school_crawl_logf($school_crawl_log, 10, "%s:%s", $var, ${$var});

	  $semester->section_meeting_add($section_id['department'], $section_id['course'], $title, $section_id['section'], $synonym,

	  /*

	   * Try to update semester's longetivity stats to help the

	   * school_semester_guess() function:

	   */

	  $date_start_time = strptime($date_start, '%m/%d/%Y');

	  $date_end_time = strptime($date_end, '%m/%d/%Y');

	  if ($date_start_time !== FALSE)

	    {

	      $date_start_time = school_crawl_gmmktime($date_start_time, -5 * 60*60);

	      $semester->time_start_pool_add($date_start_time);

	   */

	  $synonym = $course_table[0]->nodeValue;

	  $section_parts = Section::parse($course_table[1]->nodeValue);

	  if (count($section_parts) < 3)

	    {

	      school_crawl_logf($school_crawl_log, 6, "Error parsing section_id. Given `%s'; interpreted as `%s'. Skipping.",

				$course_table[1]->nodeValue, implode('-', $section_parts));

	      continue;

	    }

          $title = $course_table[2]->nodeValue;

	  /*

	   * For courses with multiple section meetings, each

	   * instructor for each section meeting is separated by <br/>.

	   */

	  $instructors = array('');

	  foreach ($course_table[3]->childNodes as $child)

	    switch ($child->nodeType)

	      {

	      case XML_ELEMENT_NODE:

		end($instructors);

		if (!strcmp($child->tagName, 'br')

	       */

	      if ($meeting_i >= count($instructors))

		$instructors[$meeting_i] = $instructors[0];

	      $meetings[] = new SectionMeeting($days, $time_start, $time_end,

					       $room, $type, $instructors[$meeting_i]);

	      $meeting_i ++;

	    }

	  $semester->section_add($section_parts['department'], $section_parts['course'],

				 new Section($section_parts['section'], $meetings,

	}

    }

  return 0;

}

/**

 * \brief

 *   Look up the URI used to access information about a particular

 *   Cedarville semester.

 *

 * \param $semester

/**

 * \brief

 *   Get a list of default classes (with sections (with meeting

 *   times)) for Cedarville students.

 *

 * \return

 *   An array of Course objects.

 */

function cedarville_default_courses()

{

  $chapel = new Course('Chapel','Chapel');

  return array($chapel);

}

/**

 * \brief

 *   Implement <school_id>_page_css().

 */

function cedarville_page_css($school)

{

  return <<<CSS

#container .type-lab .sectionIdentifier,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Affero General Public License for more details.

 *

 * You should have received a copy of the GNU Affero General Public License

 * along with SlatePermutate.  If not, see <http://www.gnu.org/licenses/>.

 */

    //--------------------------------------------------

    // General Notes

    //--------------------------------------------------

var classNum = 0;

/**

 * \brief

 *   The number of section entries for a given course.

 *

 * Key is course_i, value is the current number of sections.

 */

var sectionsOfClass = new Array();

/**

 * \brief

        my: 'top left', 

        at: 'bottom right'

      }

    }

  );

}

/**

 * \brief

 *   Add a section to a class.

 */

{

    var snum = last_section_i ++;

    var cssclasses = 'section class' + cnum + ' ' + safe_css_class('slot-' + slot);

    var last_tr;

	/*

	 * Add the type of the course to the CSS if it's a valid (and

	 * _clean-looking_ CSS class). Supports things like Cedarville's

	 * coloration of labs/ILB.

	 */

	if (/[a-z-]+/.exec(type) != null)

		cssclasses += ' type-' + type;

    }

    section_html = section_html + '</select></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][0]" value="1" ' + (days.m ? 'checked="checked"' : '') + ' /></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][1]" value="1" ' + (days.t ? 'checked="checked"' : '') + ' /></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][2]" value="1" ' + (days.w ? 'checked="checked"' : '') + ' /></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][3]" value="1" ' + (days.h ? 'checked="checked"' : '') + ' /></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][4]" value="1" ' + (days.f ? 'checked="checked"' : '') + ' /></td>\

<td class="cbrow"><input type="checkbox" class="daysRequired" name="postData[' + cnum + '][' + snum + '][days][5]" value="1" ' + (days.s ? 'checked="checked"' : '') + ' /></td>' +

	'<td class="removeCell"><div class="deleteSection"><input type="button" value="x" class="gray" /></div></td><td class="emptyCell">' +

	'<input class="section-location-entry" type="hidden" name="postData[' + cnum + '][' + snum + '][location]" />' +

	'<input class="section-type-entry" type="hidden" name="postData[' + cnum + '][' + snum + '][type]" />' +