# HG changeset patch
# User Nathan Phillip Brink <ohnobinki@ohnopublishing.net>
# Date 2011-03-18 19:47:26
# Node ID fe65a57a01fe9d62701510a01cd0e33d21991c69
# Parent  4b67cd715f514a2bcd93dd2650c187d5267ae370

Store a schedule's parent_id and make awkwardly accessible via a ``Parent'' buttonlink. Fixes bug 91.

diff --git a/inc/class.schedule.php b/inc/class.schedule.php
--- a/inc/class.schedule.php
+++ b/inc/class.schedule.php
@@ -52,6 +52,7 @@ class Schedule
   private $possiblePermutations;	// Integer number of possible permutations
   private $scheduleName;			// String name of schedule
   private $storage;				// Integer array of valid schedules
+  /* The <title /> of the page used when rendering this schedule */
   private $title;
 
   /**
@@ -61,16 +62,31 @@ class Schedule
    */
   private $id;
 
+  /*
+   * The identifier of the schedule from which this schedule was
+   * derived or NULL.
+   */
+  private $parent_id;
+
   /**
    * \brief
    *   Create a schedule with the given name.
+   *
+   * \param $name
+   *   A string, the friendly name the user gave this schedule.
+   * \param $parent
+   *   An integer, the id of the schedule from which this schedule is
+   *   derived. A schedule is considered to be derived of another of
+   *   the user created this schedule by clicking ``Edit'' for the
+   *   previous schedule. Or NULL if this schedule stands on its own.
    */
-  function __construct($name)
+  function __construct($name, $parent = NULL)
   {
     $this->courses = array();
     $this->scheduleName = $name;
     $this->storage = array();
     $this->title = "SlatePermutate - Scheduler";
+    $this->parent_id = $parent;
 
     /* mark this as an upgraded Schedule class. See __wakeup() */
     $this->nclasses = -1;
@@ -206,10 +222,16 @@ class Schedule
       } while($counter < $this->possiblePermutations);
   }
     
+  /**
+   * \brief
+   *   Prints out the possible permutations in tables.
+   *
+   * \param $schedule_store
+   *   The schedule_store handle with which this schedule was loaded,
+   *   used to query the parent schedule.
+   */
   //--------------------------------------------------
-  // Prints out the possible permutations in tables.
-  //--------------------------------------------------
-  function writeoutTables()
+  function writeoutTables(array $schedule_store = NULL)
   {
     $filled = false;
     $time = array(700,730,800,830,900,930,1000,1030,1100,1130,1200,1230,1300,1330,1400,1430,1500,1530,1600,1630,1700,1730,1800,1830,1900,1930,2000,2030,2100,2130, 2200);
@@ -264,7 +286,7 @@ class Schedule
 
     }
     else {
-      echo '<script type="text/javascript">';
+      echo '        <script type="text/javascript">';
       echo '  jQuery(document).ready( function() {';
       echo '    jQuery("#tabs").tabs();';
       echo '    jQuery.address.change(function(event){';
@@ -284,15 +306,28 @@ class Schedule
 	        });
 	        jQuery(\'#cancelItems\').click( function() {
 		  jQuery(\'#selectItemsInput\').hide();
-	        });';
-      echo '  });
-            </script>';
+	        });'
+	. '  });' . PHP_EOL
+	. '        </script>' . PHP_EOL;
 
-      echo '<div id="sharedialog" title="Share Schedule"><p class="indent"><img class="noborder" src="http://facebook.com/favicon.ico" /> <a target="_blank" href="http://www.facebook.com/sharer.php?u=' . urlencode(htmlentities($outputPage->gen_share_url($this->id_get()))) .'&amp;t=My%20Schedule">Share on Facebook</a></p><p class="indent">You can also share your schedule with the URL below:<br /><em class="centeredtext smallurl">' . htmlentities($outputPage->gen_share_url($this->id_get())) . '</em></p></div>' . "\n";
-      echo '<p><a href="input.php?s='.$this->id.'" class="button">Edit</a> <span id="printItems"><a href="#" class="button">Print</a></span> <span id="share"><a href="#" class="button">Share</a></span>  <a class="button" href="input.php">Home</a></p>'. "\n";
-      echo '<p class="centeredtext">Having problems? <a href="feedback.php">Let us know</a>.</p>' . "\n";
-      echo '<p class="centeredtext graytext"><em>Keyboard Shortcut: Left and right arrow keys switch between schedules</em></p>' . "\n";
+      echo '        <div id="sharedialog" title="Share Schedule">' . PHP_EOL
+	. '          <p class="indent"><img class="noborder" src="http://facebook.com/favicon.ico" /> <a target="_blank" href="http://www.facebook.com/sharer.php?u=' . urlencode(htmlentities($outputPage->gen_share_url($this->id_get()))) .'&amp;t=My%20Schedule">Share on Facebook</a></p><p class="indent">You can also share your schedule with the URL below:<br /><em class="centeredtext smallurl">' . htmlentities($outputPage->gen_share_url($this->id_get())) . '</em></p>' . PHP_EOL
+	. '        </div>' . PHP_EOL
+	. '        <p>' . PHP_EOL
+	. '          <a href="input.php?s='.$this->id.'" class="button">Edit</a>' . PHP_EOL
+	. '          <span id="printItems"><a href="#" class="button">Print</a></span>' . PHP_EOL
+	. '          <span id="share"><a href="#" class="button">Share</a></span>' . PHP_EOL;
+
 
+      if ($schedule_store !== NULL
+	  && $this->parent_get() !== NULL
+	  && ($parent_schedule = schedule_store_retrieve($schedule_store, $this->parent_get())) !== NULL)
+	echo '          <a class="button" href="' . htmlentities($parent_schedule->url()) . '" title="Parent schedule: ' . htmlentities($parent_schedule->getName()) . '">Parent</a>' . PHP_EOL;
+
+      echo '          <a class="button" href="input.php">Home</a>' . PHP_EOL
+	. '        </p>'. PHP_EOL
+	. '        <p class="centeredtext">Having problems? <a href="feedback.php">Let us know</a>.</p>' . PHP_EOL
+	. '        <p class="centeredtext graytext"><em>Keyboard Shortcut: Left and right arrow keys switch between schedules</em></p>' . PHP_EOL;
     }		
 
     echo "\n";
@@ -598,6 +633,16 @@ class Schedule
 
   /**
    * \brief
+   *   Get the ID of the schedule from which this schedule was
+   *   derived.
+   */
+  public function parent_get()
+  {
+    return $this->parent_id;
+  }
+
+  /**
+   * \brief
    *   A magic function which tries to upgrade old serialized sections
    *   to the new format.
    */
@@ -613,5 +658,8 @@ class Schedule
 	$this->courses[] = $classes->to_course();
       }
     $this->nclasses = -1;
+
+    if (empty($this->parent_id))
+      $this->parent_id = NULL;
   }
 }
diff --git a/input.php b/input.php
--- a/input.php
+++ b/input.php
@@ -31,11 +31,12 @@ require_once('inc' . DIRECTORY_SEPARATOR
 $sch = FALSE;
 $school = $inputPage->get_school();
 
+$parent_schedule_id = NULL;
 if (isset($_REQUEST['s']))
   {
     $schedule_store = schedule_store_init();
-    $schedule_id = (int)$_REQUEST['s'];
-    $sch = schedule_store_retrieve($schedule_store, $schedule_id);
+    $parent_schedule_id = (int)$_REQUEST['s'];
+    $sch = schedule_store_retrieve($schedule_store, $parent_schedule_id);
   }
 
 $my_hc = 'var slate_permutate_example_course_id = \'' . str_replace('\'', '\\\'', school_example_course_id($inputPage->get_school())) . '\';
@@ -135,7 +136,10 @@ if (!empty($_REQUEST['selectsemester']))
 
 <form method="post" action="process.php" id="scheduleForm">
 <p class="nospace" style="border-left: 5px solid #999; padding-left: 5px!important; padding-top: 5px!important;"><label>Schedule Name</label><br />
-  <input id="scheduleName" style="margin-bottom: 1em;" class="defText required" type="text" size="25" title="Spring 2011" name="postData[name]" <?php if ($sch) echo 'value="' . htmlentities($sch->getName(), ENT_QUOTES) . '"'; /*"*/ ?> />
+  <input id="scheduleName" style="margin-bottom: 1em;" class="defText required" type="text" size="25" title="Spring 2011" name="postData[name]" <?php if ($sch) echo 'value="' . htmlentities($sch->getName(), ENT_QUOTES) . '"'; ?> />
+  <?php if (!empty($parent_schedule_id)): ?>
+  <input type="hidden" name="postData[parent_schedule_id]" value="<?php echo htmlentities($parent_schedule_id); ?>" />
+  <?php endif; ?>
 </p>
 
 <table id="container">
diff --git a/process.php b/process.php
--- a/process.php
+++ b/process.php
@@ -93,7 +93,7 @@ if(!$DEBUG)
       {
 	$savedSched = schedule_store_retrieve($schedule_store, $s);
 	if ($savedSched)
-	  $savedSched->writeoutTables();
+	  $savedSched->writeoutTables($schedule_store);
 	else
 	  page::show_404('Unable to find a saved schedule with an ID of ' . $s . '.');
       }
@@ -122,8 +122,22 @@ if(!$DEBUG)
 	 * it as a schedule to permutate. Then we should redirect the
 	 * user to the canonical URL for that schedule.
 	 */
-		$allClasses = new Schedule($_POST['postData']['name']);
-	
+	$name = '';
+	if (!empty($_POST['postData']['name']))
+	  $name = $_POST['postData']['name'];
+
+	$parent_schedule_id = NULL;
+	if (!empty($_POST['postData']['parent_schedule_id']))
+	  {
+	    $parent_schedule_id = (int)$_POST['postData']['parent_schedule_id'];
+	    $parent_schedule = schedule_store_retrieve($schedule_store, $parent_schedule_id);
+	    /* Detect bad parent_schedule reference. */
+	    if (empty($parent_schedule))
+	      $parent_schedule_id = NULL;
+	  }
+
+	$allClasses = new Schedule($name, $parent_schedule_id);
+
 		foreach($_POST['postData'] as $class)
 		{
 		  /*