<?php
/**
* Defines a class for viewing the SLOODLE Second Life Tracker module in Moodle.
* Derived from the module view base class.
*
*/

/** The base module view class */
require_once(SLOODLE_DIRROOT.'/view/base/base_view_module.php');
/** The SLOODLE Session data structures */
require_once(SLOODLE_LIBROOT.'/sloodle_session.php');



/**
* Class for rendering a view of a Second Life Tracker module in Moodle.
* @package sloodle
*/
class sloodle_view_tracker extends sloodle_base_view_module
{

    /**
    * When multiple users will be displayed, this value indicates which record to start from.
    * It will be read from HTTP parameters.
    * @var int
    * @access private
    */
    var $start = 0;

    /**
    * Number of users to display per page.
    * @var int
    * @access private
    */
    var $usersPerPage = 10;

    /**
    * The number of the page of users to be displayed.
    * 1-based.
    * @var int
    * @access private
    */
    var $page = 1;


    /**
    * Constructor.
    */
    function __construct()
    {
    }


    /**
    * Processes request data to determine which Second Life Tracker is being accessed.
    */
    function process_request()
    {
        // Process the basic data
        parent::process_request();

        $this->page = optional_param('page', 1, PARAM_INT);
        if ($this->page < 1) $this->page = 1;
        $this->start = ($this->page - 1) * $this->usersPerPage;

        // Nothing else to get just now
    }


    /**
    * Process any form data which has been submitted.
    */
    function process_form()
    {
    }


    /**
    * Get the students enroled in this course.
    * @return $userlist: A list with the users, empty if there are no users enroled
    */
    function get_class_list()
    {
        $userlist = array();
        
        // Ideally, use the capability-based user search.
        // This may not exist in particularly early versions of Moodle 1.8 and 1.9.
        // Fall-back on the function to get all users in a course if necessary,
        //  but note that it is a deprecated function, and it only seems to return students.
        if (function_exists('get_users_by_capability')) {
            $userlist = get_users_by_capability($this->course_context, 'mod/sloodle:courseparticipate', 'u.id, u.firstname, u.lastname', 'u.firstname, u.lastname');
        }
        else {
            $userlist = get_course_users($this->courseid, 'firstname, lastname', '', 'u.id, firstname, lastname');
        }

        // Return an empty array if something went wrong
        if (!$userlist) return array();        
        return $userlist;
    }


    /**
    * Render the view of the SecondLife Tracker.
    */
    function render()
    { 
        global $CFG, $USER;   
           
        $session = new SloodleSession(false);
        $tracker = new SloodleModuleTracker($session);
        
        // Check if this user is allowed to view all users in this activity, and if s/he is allowed to manage this activity
        $canManage = $this->canedit;
        
        // Load data of the current Second Life Tracker
        if (!$tracker->load($this->cm->id)) print_error("FAILED TO LOAD MODULE");
     
        $this->courseid = $this->course->id; 
        $sloodleid = $this->sloodle->id;

        if ($canManage) {
            $strtrackeradmin     = get_string('trackeradmin', 'sloodle');
            $strresetallprogress = get_string('resetallprogress', 'sloodle');
            $strdeletealltasks   = get_string('deletealltasks', 'sloodle');
            $strtobackpack       = get_string('to_backpack', 'sloodle');

            $form_currency = '';
            if (!$tracker->tracker->autosend) {     // manual mode 
                $option = '';
                $currencyid = optional_param('currency', 0, PARAM_INT);
                $all_currencies = SloodleCurrency::FetchIDNameHash();
                foreach($all_currencies as $id => $name) {
                    $selected = ''; 
                    if ($id==$currencyid) $selected = 'selected';
                    $option .= '<option value="'.$id.'" '.$selected.'>'.$name.'</option>';
                }

                $form_currency = '<td>&nbsp;</td><form action="" method="POST" style="padding:6px;"><td>'.
                                 '<input type="hidden" name="id" value="'.$this->cm->id.'"/>'.
                                 '<input type="hidden" name="action" value="to_backpack"/>'.
                                 '<input type="submit" value="'.$strtobackpack.'"/>'.
                                 '</td><td><select name="currency">'.$option.'</select></td></form>';
            }

            echo <<<XXXEODXXX
<table style="margin:auto auto; ">
<!--<tr><th colspan="2">{$strtrackeradmin}</th></tr>-->
 <tr>
  <td style="text-align:center;">
   <form action="" method="POST" style="padding:6px;">
    <input type="hidden" name="id" value="{$this->cm->id}"/>
    <input type="hidden" name="action" value="reset_all_progress"/>
    <input type="submit" value="{$strresetallprogress}"/>
   </form>
  </td>
  <td style="text-align:center;">
   <form action="" method="POST" style="padding:6px;">
    <input type="hidden" name="id" value="{$this->cm->id}"/>
    <input type="hidden" name="action" value="delete_all_tasks"/>
    <input type="submit" value="{$strdeletealltasks}"/>
   </form>
  </td>
  {$form_currency}
 </tr>
</table>
XXXEODXXX;
        }
 
        print('<h3 style="color:black;text-align:center;">'.get_string('tracker:activity','sloodle').'</h3>'); 
        print('<br /><hr /><br />'); 

        //
        // Check if some kind of action has been requested, used if tasks has been reset
        $action = optional_param('action', '', PARAM_TEXT);
        
        // Has a reset task progress action been requested?
        if ($action=='reset_tasks' && $canManage) {
            //
            foreach ($_REQUEST as $name => $val) {
                if ($val!='true') continue;
                $parts = explode('_', $name);   // ex. $name === "sloodledeleteobj_43"
                //
                if (count($parts)==2 && $parts[0]=='sloodledeleteobj') {
                    $actv = sloodle_get_record('sloodle_activity_tracker', 'id', (int)$parts[1]);
                    if ($actv) {
                        $user = sloodle_get_record('sloodle_users', 'uuid', $actv->avuuid);
                        $tool = sloodle_get_record('sloodle_activity_tool', 'uuid', $actv->objuuid);
                        if ($user and $tool) {
                            sloodle_delete_records('sloodle_award_points', 'userid', $user->userid, 'roundid', $tool->roundid);
                        }
                        sloodle_delete_records('sloodle_activity_tracker', 'trackerid', $this->cm->id, 'id', (int)$parts[1]);                        
                    }
                }
            }
        }

        // Has a reset all tasks action been requested? (This deletes all activities from the module)
        if ($action=='delete_all_tasks' && $canManage) {
            $tools = sloodle_get_records('sloodle_activity_tool', 'trackerid', $this->cm->id);
            if ($tools) {
                foreach ($tools as $tool) {
                    sloodle_delete_records('sloodle_award_points', 'roundid', $tool->roundid);
                    sloodle_delete_records('sloodle_award_rounds', 'id',      $tool->roundid);
                }
            }
            sloodle_delete_records('sloodle_activity_tracker', 'trackerid', $this->cm->id);
            sloodle_delete_records('sloodle_activity_tool',    'trackerid', $this->cm->id);
        }

        // Has a reset all progress action been requested?
        if ($action=='reset_all_progress' && $canManage) {
            // 
            $tools = sloodle_get_records('sloodle_activity_tool', 'trackerid', $this->cm->id);
            if ($tools) {
                foreach ($tools as $tool) {
                    sloodle_delete_records('sloodle_award_points', 'roundid', $tool->roundid);
                }
            }
            sloodle_delete_records('sloodle_activity_tracker', 'trackerid', $this->cm->id);
        }

        // 
        if ($action == 'to_backpack' && $canManage) {
            //
            $currencyid = (int)required_param('currency', PARAM_INT);
            $tools = sloodle_get_records('sloodle_activity_tool',    'trackerid', $this->cm->id);
            $actvs = sloodle_get_records('sloodle_activity_tracker', 'trackerid', $this->cm->id);

            if ($tools and $actvs) {
                foreach ($tools as $tool) {
                    foreach($actvs as $actv) {
                        if ($actv->objuuid==$tool->uuid) {
                            $user = sloodle_get_record('sloodle_users', 'uuid', $actv->avuuid);
                            sloodle_award_points_update($user->userid, $tool->roundid, $currencyid, $tool->award, $tool->taskname);
                        }
                    }
                }
            }
        }

        //
        //Obtain the users in this course  
        $userlist = $this->get_class_list();
          
        if ($userlist) {          
            // How many pages of users are there?
            $numresults = count($userlist);
            $numpages = (int)ceil($numresults / $this->usersPerPage);
            if ($this->page > $numpages) $this->page = $numpages;
            $this->start = ($this->page - 1) * $this->usersPerPage;
                     
            $sloodletable = new stdClass();
            
            // Create column headers for html table
            $sloodletable->head = array(get_string('user', 'sloodle'), get_string('avatar', 'sloodle'), get_string('awards:total', 'sloodle'));
            // Set alignment of table cells                                        
            $sloodletable->align = array('center', 'center', 'right');
            // Set size of table cells
            $sloodletable->size = array('38%', '38%', '24%');
            
            // Check if our start is past the end of our results
            if (empty($this->start) || $this->start >= count($userlist)) $this->start = 0;
            // Ignore the start parameter if the user can only see his/her own record
            if (!$canManage) $this->start = 0;
            
            $resultnum = 0;
            $resultsdisplayed = 0;
                       
            // Go through each user
            foreach ($userlist as $u) {
                // Skip until the desired start point of the results
                if ($resultnum < $this->start) {
                    $resultnum++;
                    continue;
                }
                // If this user is not a teacher, and this is not the user's own details, then skip this iteration
                if (!($u->id == $USER->id || $canManage)) continue;
                
                $avatarid = '';
                $tasks = 0;
                $completed = 0;
                $total_award = 0;

                // Reset the line's content
                $line = array();

                // Construct URLs to this user's Moodle and SLOODLE profile pages
                $url_moodleprofile  = $CFG->wwwroot."/user/view.php?id={$u->id}&amp;course={$this->courseid}";
                $url_sloodleprofile = SLOODLE_WWWROOT."/view.php?_type=user&amp;id={$u->id}&amp;course={$this->courseid}";                                   
                // Add the Moodle name
                $line[0] = "<a href=\"{$url_moodleprofile}\">{$u->firstname} {$u->lastname}</a>";                    
                    
                $sloodledata = sloodle_get_records('sloodle_users', 'userid', $u->id, 'uuid, avname');
                // 
                if ($sloodledata) {
                    // Display all avatars names, if available
                    $avnames = '';
                    $firstentry = true;
                        
                    foreach ($sloodledata as $sd) {                           
                        // If this entry is empty, then skip it
                        if (empty($sd->avname) || ctype_space($sd->avname)) continue;
                        // Comma separated entries
                        if ($firstentry) $firstentry = false;
                        else $avnames .= ', ';
                        // Add the current name
                        $avnames .= $sd->avname;
                        $avatarid = $sd->uuid;           
                    }

                    if ($avatarid!='') {
                        $select = 'trackerid = ? AND avuuid = ?';
                        $params = array($this->cm->id, $avatarid);
                        $recs = sloodle_get_records_select_params('sloodle_activity_tracker', $select, $params);
                        if (is_array($recs) && count($recs) > 0) {
                            foreach ($recs as $obj) {
                                $total_award += $obj->award;
                            }
                        }
                    }

                    // Add the avatar name(s) to the line
                    $line[1] = "<a href=\"{$url_sloodleprofile}\">{$avnames}</a>";   
                }
                else {
                    // The query failed - if we are showing only Sloodle-enabled users, then skip the rest
                    if (!empty($this->sloodleonly) && $this->sloodleonly) continue;
                    $line[1] = get_string('tracker:noavatar','sloodle');                       
                }

                $line[2] = $total_award;
                $sloodletable->data[0] = $line;  
                $resultsdisplayed++;
                
                //
                sloodle_print_table($sloodletable);

                //Now all the tasks in the Tracker are displayed
                echo "<div style=\"text-align:center;\">\n";
                //echo '<h3>'.get_string('tasks','sloodle').'</h3>';
                echo "<br />";
                
                // Get all the tasks for this Tracker, ordered by "taskname"
                $recs = sloodle_get_records('sloodle_activity_tool', 'trackerid', $this->cm->id, 'taskname');
            
                if (is_array($recs) && count($recs) > 0) {
                    $objects_table = new stdClass();
                    
                    // Create column headers for html table
                    $objects_table->head = array(get_string('objectname', 'sloodle'), 
                                                 get_string('tracker:objdesc', 'sloodle'),
                                                 get_string('tracker:levelcompl', 'sloodle'), 
                                                 get_string('awards:award', 'sloodle'), 
                                                 get_string('awards:date', 'sloodle'), 
                                                 '');
                    // Set alignment of table cells 
                    $objects_table->align = array('left', 'left', 'center', 'right', 'center', 'center');
                    $overall = 0;
                    
                    foreach ($recs as $obj) {
                        // Skip this object if it has no type information
                        if (empty($obj->type)) continue;
                           
                        //Has this user completed the task?
                        $act = sloodle_get_record('sloodle_activity_tracker', 'avuuid', $avatarid, 'objuuid', $obj->uuid, 'trackerid', $this->cm->id);
                          
                        //Yes. Activity completed
                        if (!empty($act)){
                             //$timezone = $act->timeupdated - 3600; // ???      
                             $date = date(get_string('date_format', 'sloodle'), $act->timeupdated);   
                            
                             // Only the admin can reset tasks  
                             if ($canManage) {
                                 $objects_table->data[] = array(
                                     '<span style="text-align:center;">'.$obj->taskname.'</a>', 
                                     $obj->description, 
                                     '<span style="text-align:center;color:green;">'.get_string('tracker:completed','sloodle').'</span><br />', 
                                     $act->award,
                                     $date,
                                     "<input type=\"checkbox\" name=\"sloodledeleteobj_{$act->id}\" value=\"true\" />");
                             }
                             else {
                                 $objects_table->data[] = array(
                                     '<span style="text-align:center;">'.$obj->taskname.'</a>', 
                                     $obj->description,
                                     '<span style="text-align:center;color:green">'.get_string('tracker:completed','sloodle').'</span><br />', 
                                     $act->award,
                                     $date, 
                                     ' - ');
                             }
                             $tasks += 1;
                             $completed += 1;
                        }
						
                        //No. Activity not completed
                        else {
                            $objects_table->data[] = array(
                                '<span style="text-align:center;">'.$obj->taskname.'</a>', $obj->description, 
                                '<span style="text-align:center;color:red">'.get_string('tracker:notcompleted','sloodle').'</span><br />',
                                0, ' - ',' - ');
                            $tasks += 1;
                        }
                        
                        //Overall percentage of tasks completed?
                        $overall = 0;
                        if ($tasks > 0) $overall = ((integer)(($completed / $tasks) * 1000.0)) / 10.0;
                    }    
                    
                    // If is the admin, show the reset button
                    if ($canManage){
                        echo '<form action="" method="POST">';
                        echo '<input type="hidden" name="id" value="'.$this->cm->id.'"/>';
                        echo '<input type="hidden" name="action" value="reset_tasks"/>';
                           
                        sloodle_print_table($objects_table);
                        echo '<h3>'.get_string('tracker:completerate','sloodle').': '.$overall.'%</h3>';
                        echo '<input type="submit" value="'.get_string('resettasks','sloodle').'"/>';
                        echo '</form>';
                    }
                    else {
                        sloodle_print_table($objects_table);
                        echo '<h3>'.get_string('tracker:completerate','sloodle').': '.$overall.'%</h3>';
                    }
                }
                //No tasks in the Tracker
                else {
                    echo '<span style="text-align:center;color:red">'.'No tasks found'.'</span><br />';
                }

                //echo '<p>&nbsp;</p>';
                echo "<br /><hr><br />";
                echo "</div>\n";
                                
                // Have we displayed the maximum number of results for this page?
                $resultnum++;
                if ($resultsdisplayed >= $this->usersPerPage) break;
            }
                        
            $basicurl = SLOODLE_WWWROOT."/view.php?id={$this->cm->id}&amp;course={$this->courseid}";  

            // Construct the links for page navigation
            $prevlink = ""; $nextlink = "";
            if ($this->page > 1) {
                $prevpage = $this->page - 1;
                $prevlink = "<a href=\"{$basicurl}&amp;page={$prevpage}\">&lt;&lt;</a>&nbsp;&nbsp;";
            }
            else {
                $prevlink = "<span style=\"color:#777777;\">&lt;&lt;</span>&nbsp;&nbsp;";
            }

            if ($this->page < $numpages) {
                $nextpage = $this->page + 1;
                $nextlink = "&nbsp;&nbsp;<a href=\"{$basicurl}&amp;page={$nextpage}\">&gt;&gt;</a>";
            }
            else {
                $nextlink = "&nbsp;&nbsp;<span style=\"color:#777777;\">&gt;&gt;</span>";
            }

            // Display the page navigation
            echo "<div style=\"text-align:center; font-size:130%; font-weight:bold;\">";
            echo $prevlink;
            $pagenav = new stdClass();
            $pagenav->num = $this->page;
            $pagenav->total = $numpages;
            print_string('pagecount', 'sloodle', $pagenav);
            echo $nextlink;
            echo "</div>";
        }

        //No users enroled in the course
        else {
            echo "<div style=\"text-align:center;\">\n";
            echo '<span style="color:red">'.get_string('tracker:nousers','sloodle').'</span><br />';
        }
    }   
}