<?php
// This file is part of the Sloodle project (www.sloodle.org)
/**
* Defines a class to render a view of SLOODLE course information.
* Class is inherited from the base view class.
*
* @package sloodle
* @copyright Copyright (c) 2008 Sloodle (various contributors)
* @license http://www.gnu.org/licenses/gpl-3.0.html GNU GPL v3
*
* @contributor Edmund Edgar
* @contributor Paul Preibisch
*
*/ 

/** The base view class */
require_once(SLOODLE_DIRROOT.'/view/base/base_view.php');
/** SLOODLE logs data structure */
require_once(SLOODLE_LIBROOT.'/course.php');
require_once(SLOODLE_LIBROOT.'/currency.php');    

// Javascript for checking and unchecking checkboxes
sloodle_require_js($CFG->wwwroot . '/mod/sloodle/lib/jquery/jquery-1.3.2.min.js');
sloodle_require_js($CFG->wwwroot . '/mod/sloodle/lib/js/backpack.js');

/**
* Class for rendering a view of SLOODLE course information.
* @package sloodle
*/
class sloodle_view_backpack extends sloodle_base_view {
    /**
    * The Moodle course object, retrieved directly from database.
    * @var object
    * @access private
    */
    var $course = 0;

    /**
    * SLOODLE course object, retrieved directly from database.
    * @var object
    * @access private
    */
    var $sloodle_course = null;

    /**
    * Constructor.
    */
    function sloodle_view_backpack()
    {


    }

    /**
    * Check the request parameters to see which course was specified.
    */
    function process_request()
    {
    global $USER;

    $id = required_param('id', PARAM_INT);
    //check if valid course
    if (!$this->course = sloodle_get_record('course', 'id', $id)) error('Could not find course.');
    $this->sloodle_course = new SloodleCourse();
    if (!$this->sloodle_course->load($this->course)) error(get_string('failedcourseload', 'sloodle'));

    }


    function process_form() {

    $id = required_param('id', PARAM_INT);
    //has itemAdd forum been submitted?

    $isItemAdd= optional_param('isItemAdd',0, PARAM_INT);

    $userIds = optional_param('userIds', 0, PARAM_INT);

    //itemAdd form has been submitted
    if ($isItemAdd) {

    if (!$this->can_edit) {
    print_error("Permission denied");
    }

    $controllerid = required_param('controllerid', PARAM_INT);

    //fetch all currencies
    $all_currencies = SloodleCurrency::FetchIDNameHash();

    //create controller so we can fetch active round
    $controller = new SloodleController();
    if(!$controller->load_by_course_module_id($controllerid)) {
    print_error('Could not load controller for '.$controllerid);
    }
    $roundid = $controller->get_active_roundid(true);

    //go through each currency and see if it has been set, if it has, we have to update each user who
    //has been checked
    foreach($all_currencies as $currencyid => $currencyname) {

    //check if a currency update is necessary for this currency
    //build the currencyname field  for this currency
    $fieldname="currency_".$currencyid;

    //now see if it was submitted
    $fieldvalue= optional_param($fieldname,0,PARAM_INT);

    //if no value has been submitted for this currency, we can skip adding this currency to the users!
    if ($fieldvalue==0) {
    continue;
    }

    foreach ($userIds as $u) {
    //go through each user which was checked and give them the selected currency and amount
    //create backpack item
    $backpack_item = new stdClass();
    $backpack_item->currencyid=intval($currencyid);
    $backpack_item->userid=intval($u);
    $backpack_item->amount=intval($fieldvalue);
    $backpack_item->timeawarded=time();
    $backpack_item->roundid=$roundid;
    $backpack_item->description="moodle add by ". $USER->username;

    //add it to the users backpack                    
    sloodle_insert_record('sloodle_award_points',$backpack_item);
    } 
    } 
    }
    }

    /**
    * Check that the user is logged-in and has permission to alter course settings.
    */
    function check_permission()
    {
        // Ensure the user logs in
        require_login($this->course->id);
        if (isguestuser()) error(get_string('noguestaccess', 'sloodle'));
        add_to_log($this->course->id, 'course', 'view sloodle data', '', "{$this->course->id}");
        // Ensure the user is allowed to update information on this course
        $this->course_context = get_context_instance(CONTEXT_COURSE, $this->course->id);
        if (has_capability('moodle/course:update', $this->course_context)) $this->can_edit = true;
    }

    /**
    * Print the course settings page header.
    */
    function sloodle_print_header()
    {
        global $CFG;

        //print breadcrumbs
        $navigation = "<a href=\"{$CFG->wwwroot}/mod/sloodle/view.php?_type=backpack&id={$this->course->id}\">";
        $navigation .= get_string('backpack:view', 'sloodle');
        $navigation .= "</a>";
        //print the header
        sloodle_print_header_simple(get_string('backpack','sloodle'), '&nbsp;', $navigation, "", "", true, '', false);
    }

    /**
    * Render the view of the module or feature.
    * This MUST be overridden to provide functionality.
    */
    function render() {                                      

        global $CFG;      
        global $COURSE;
        $view = optional_param('view', "", PARAM_TEXT);

        // Setup our list of tabs
        // We will always have a view option
        $action = optional_param('action', "", PARAM_TEXT);                 
        $context = get_context_instance(CONTEXT_COURSE,$this->course->id);
        echo "<br>";

        //print titles
        sloodle_print_box_start('generalbox boxaligncenter center  boxheightnarrow leftpara');                  

        echo '<div style="position:relative ">';
        echo '<span style="position:relative;font-size:36px;font-weight:bold;">';

        //print return to backpack icon
        echo '<img align="center" src="'.SLOODLE_WWWROOT.'/lib/media/backpack64.png" width="48"/>';

        //print return to backpack title text
        echo s(get_string('backpacks:backpacks', 'sloodle'));
        echo '</span>';
        echo '<span style="float:right;">';
        echo '<a  style="text-decoration:none" href="'.$CFG->wwwroot.'/mod/sloodle/view.php?_type=currency&id='.$COURSE->id.'">';
        echo s(get_string('currency:viewcurrencies', 'sloodle')).'<br>';

        //print return to currencies icon
        echo '<img src="'.SLOODLE_WWWROOT.'/lib/media/returntocurrencies.png"/></a>';
        echo '</span>';
        echo '</div>';
        echo '<br>';
        echo '<span style="position:relative;float:right;">';
        echo '</span>';

        //get all currency names
        $all_currencies = SloodleCurrency::FetchIDNameHash();
        $active_currency_ids = array();

        $contextid = $context->id;
        $courseid = $this->course->id;


        $prefix = $CFG->prefix;

        //build scoresql 
        $scoresql = "select max(p.id) as id, p.userid as userid, p.currencyid as currencyid, sum(amount) as balance
        from {$prefix}sloodle_award_points p inner join {$prefix}sloodle_award_rounds ro on ro.id=p.roundid 
        where ro.courseid = ? group by p.userid, p.currencyid order by balance desc;
        ";
        $scores = sloodle_get_records_sql_params( $scoresql, array( $courseid ) );

        //build usersql
        $usersql = "select max(u.id) as userid, u.firstname as firstname, u.lastname as lastname, 
        su.avname as avname from {$prefix}user u inner join ${prefix}role_assignments ra on u.id=ra.userid
        left outer join ${prefix}sloodle_users su on u.id=su.userid where ra.contextid=?
        group by u.id order by avname asc;
        ";
        $students = sloodle_get_records_sql_params( $usersql, array( $contextid ) );

        //create an array by userid
        $students_by_userid = array();
        foreach($students as $student) {
        $students_by_userid[ $student->userid ] = $student;
        }

        // students with scores, in score order
        $student_scores_by_currency_id = array();

        //creating a two dimensional array keyed by user id, then by currency for our display table
        foreach($scores as $score) {
            $userid = $score->userid;
            $currencyid = $score->currencyid;
            $active_currency_ids[ $currencyid ] = true;

            // if student is deleted from course but their score is still there, dont display their score
            if (!isset($students_by_userid[ $userid ])) { 
                continue;
            }

            //makes sure every student has an array entry 
            if ( !isset( $student_scores_by_currency_id[$userid] ) ) {
                $student_scores_by_currency_id[$userid] = array();
            }

            //put the students balance in the currency into the array
            $student_scores_by_currency_id[$userid][$currencyid] = $score->balance;
        }

        // students without scores to the end of the array, in scored order
        foreach($students_by_userid as $userid => $student) {
            if (isset($student_scores_by_currency_id[ $userid ] )) {
                continue; // already done
            }
            $student_scores_by_currency_id[ $userid ] = array();
        }

        //now build display table
        $sloodletable = new stdClass(); 

        //create header
        $headerrow = array();
        $headerrow[] = s(get_string('awards:avname', 'sloodle'));
        $headerrow[] = s(get_string('awards:username', 'sloodle'));
        foreach($all_currencies as $currencyid => $currencyname) {
            $headerrow[] = s($currencyname);
        }
        $headerrow[] = $this->can_edit ? '<input type="checkbox" id="checkall" checked>' : '&nbsp;';

        //now add the header we just built
        $sloodletable->head = $headerrow;

        //set alignment of table cells 
        $aligns = array('center','center'); // name columns
        foreach($all_currencies as $curr) {
            $aligns[] = 'right'; // each currency
        }
        $aligns[] = 'center'; // checkboxes
        $sloodletable->align = $aligns;
        $sloodletable->width="95%";

        //now display scores
        foreach($student_scores_by_currency_id as $userid => $currencybalancearray) {
            $student = $students_by_userid[ $userid ];
            $row = array();
            $url_moodleprofile = $CFG->wwwroot."/user/view.php?id={$userid}&amp;course={$COURSE->id}";
            $url_sloodleprofile = SLOODLE_WWWROOT."/view.php?_type=user&amp;id={$userid}&amp;course={$COURSE->id}";
            $row[] = "<a href=\"{$url_sloodleprofile}\">".s($student->avname)."</a>";

            $row[] = "<a href=\"{$url_moodleprofile}\">".s($student->firstname).' '.s($student->lastname)."</a>";
            foreach(array_keys($all_currencies) as $currencyid) {
                if ( isset($currencybalancearray[ $currencyid ] ) ) {
                    $row[] = s($currencybalancearray[ $currencyid ]);
                } else {
                    $row[] = ' 0 ';
                }
            }
            $row[] = $this->can_edit ? '<input type="checkbox" checked name="userIds[]" value="'.intval($userid).'">' : '&nbsp;';
            $sloodletable->data[] = $row;
        }


        if ($this->can_edit) {

            //create an extra row for the modify currency fields
            $row = array();
            $row[] = ' &nbsp; ';
            $row[] = "";
            $row[]='<span class="bpheader">'.s(get_string('backpacks:selectcontroller', 'sloodle'))."</span>";

            //build select drop down for the controllers in the course that any point updates will be linked too
            $rowText='<select style="left:20px;text-align:left;" name="controllerid">';

            //get all controllers
            $recs = sloodle_get_records_sql_params("select * from {$CFG->prefix}sloodle where type=? AND course=?", array(SLOODLE_TYPE_CTRL, $courseid));

            // Make sure we have at least one controller
            if ($recs == false || count($recs) == 0) {
                error(get_string('objectauthnocontrollers','sloodle'));
                exit();
            }

            foreach ($recs as $controller){
                $cm = get_coursemodule_from_instance('sloodle', $controller->id);
                $rowText.='<option name="controllerid" value="'.intval($cm->id).'">'.s($controller->name).'</option>';
            }
            $rowText.='</select>';

            //add controller select cell to row       
            $row[] =$rowText; 

            //now add the row to the table
            $sloodletable->data[] = $row; 

            //create another row for the submit button 
            $row = array();
            $row[] = '&nbsp;';
            $row[] = '&nbsp;';
            foreach($all_currencies as $currencyid => $currencynames) {
                $row[] = '<input type="text" name="currency_'.$currencyid.'">';
            } 
            $row[]='<input type="submit" value="Update Backpacks">';

        }

        $sloodletable->data[] = $row;  

        print('<form action="" method="POST">');
        echo '<input type="hidden" name="isItemAdd" value="1">';
        sloodle_print_table($sloodletable); 
        print '</form>';

        sloodle_print_box_end(); 
    }

}