<?php

// This file is part of the Certificate module for Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Handles viewing the report
 *
 * @package    mod_certificate
 * @copyright  Mark Nelson <markn@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once('../../config.php');
require_once('locallib.php');

$id   = required_param('id', PARAM_INT); // Course module ID
$sort = optional_param('sort', '', PARAM_RAW);
$download = optional_param('download', '', PARAM_ALPHA);
$action = optional_param('action', '', PARAM_ALPHA);

$page = optional_param('page', 0, PARAM_INT);
$perpage = optional_param('perpage', CERT_PER_PAGE, PARAM_INT);

// Ensure the perpage variable does not exceed the max allowed if
// the user has not specified they wish to view all certificates.
if (CERT_PER_PAGE !== 0) {
    if (($perpage > CERT_MAX_PER_PAGE) || ($perpage <= 0)) {
        $perpage = CERT_MAX_PER_PAGE;
    }
} else {
    $perpage = '9999999';
}

$url = new moodle_url('/mod/certificate/report.php', array('id'=>$id, 'page' => $page, 'perpage' => $perpage));
if ($download) {
    $url->param('download', $download);
}
if ($action) {
    $url->param('action', $action);
}
$PAGE->set_url($url);

if (!$cm = get_coursemodule_from_id('certificate', $id)) {
    print_error('Course Module ID was incorrect');
}

if (!$course = $DB->get_record('course', array('id'=> $cm->course))) {
    print_error('Course is misconfigured');
}

if (!$certificate = $DB->get_record('certificate', array('id'=> $cm->instance))) {
    print_error('Certificate ID was incorrect');
}

// Requires a course login
require_login($course, false, $cm);

// Check capabilities
$context = context_module::instance($cm->id);
require_capability('mod/certificate:manage', $context);

// Declare some variables
$strcertificates = get_string('modulenameplural', 'certificate');
$strcertificate  = get_string('modulename', 'certificate');
$strto = get_string('awardedto', 'certificate');
$strdate = get_string('receiveddate', 'certificate');
$strgrade = get_string('grade','certificate');
$strcode = get_string('code', 'certificate');
$strreport= get_string('report', 'certificate');

if (!$download) {
    $PAGE->navbar->add($strreport);
    $PAGE->set_title(format_string($certificate->name).": $strreport");
    $PAGE->set_heading($course->fullname);
    // Check to see if groups are being used in this choice
    if ($groupmode = groups_get_activity_groupmode($cm)) {
        groups_get_activity_group($cm, true);
    }
} else {
    $groupmode = groups_get_activity_groupmode($cm);
    // Get all results when $page and $perpage are 0
    $page = $perpage = 0;
}

// Ensure there are issues to display, if not display notice
if (!$users = certificate_get_issues($certificate->id, $DB->sql_fullname(), $groupmode, $cm, $page, $perpage)) {
    echo $OUTPUT->header();
    groups_print_activity_menu($cm, $CFG->wwwroot . '/mod/certificate/report.php?id='.$id);
    echo $OUTPUT->notification(get_string('nocertificatesissued', 'certificate'));
    echo $OUTPUT->footer($course);
    exit();
}

// Get extra fields to show the user.
$extrafields = get_extra_user_fields($context);

if ($download == "ods") {
    require_once("$CFG->libdir/odslib.class.php");

    // Calculate file name
    $filename = certificate_get_certificate_filename($certificate, $cm, $course) . '.ods';
    // Creating a workbook
    $workbook = new MoodleODSWorkbook("-");
    // Send HTTP headers
    $workbook->send($filename);
    // Creating the first worksheet
    $myxls = $workbook->add_worksheet($strreport);

    // Print names of all the fields
    $myxls->write_string(0, 0, get_string("lastname"));
    $myxls->write_string(0, 1, get_string("firstname"));
    $nextposition = 2;
    foreach ($extrafields as $field) {
        $myxls->write_string(0, $nextposition, get_user_field_name($field));
        $nextposition++;
    }
    $myxls->write_string(0, $nextposition, get_string("group"));
    $myxls->write_string(0, $nextposition + 1, $strdate);
    $myxls->write_string(0, $nextposition + 2, $strgrade);
    $myxls->write_string(0, $nextposition + 3, $strcode);

    // Generate the data for the body of the spreadsheet
    $i = 0;
    $row = 1;
    if ($users) {
        foreach ($users as $user) {
            $myxls->write_string($row, 0, $user->lastname);
            $myxls->write_string($row, 1, $user->firstname);
            $nextposition = 2;
            foreach ($extrafields as $field) {
                $myxls->write_string($row, $nextposition, $user->$field);
                $nextposition++;
            }
            $ug2 = '';
            if ($usergrps = groups_get_all_groups($course->id, $user->id)) {
                foreach ($usergrps as $ug) {
                    $ug2 = $ug2. $ug->name;
                }
            }
            $myxls->write_string($row, $nextposition, $ug2);
            $myxls->write_string($row, $nextposition + 1, userdate($user->timecreated));
            $myxls->write_string($row, $nextposition + 2, certificate_get_grade($certificate, $course, $user->id));
            $myxls->write_string($row, $nextposition + 3, $user->code);
            $row++;
        }
        $pos = 6;
    }
    // Close the workbook
    $workbook->close();
    exit;
}

if ($download == "xls") {
    require_once("$CFG->libdir/excellib.class.php");

    // Calculate file name
    $filename = certificate_get_certificate_filename($certificate, $cm, $course) . '.xls';
    // Creating a workbook
    $workbook = new MoodleExcelWorkbook("-");
    // Send HTTP headers
    $workbook->send($filename);
    // Creating the first worksheet
    $myxls = $workbook->add_worksheet($strreport);

    // Print names of all the fields
    $myxls->write_string(0, 0, get_string("lastname"));
    $myxls->write_string(0, 1, get_string("firstname"));
    $nextposition = 2;
    foreach ($extrafields as $field) {
        $myxls->write_string(0, $nextposition, get_user_field_name($field));
        $nextposition++;
    }
    $myxls->write_string(0, $nextposition, get_string("group"));
    $myxls->write_string(0, $nextposition + 1, $strdate);
    $myxls->write_string(0, $nextposition + 2, $strgrade);
    $myxls->write_string(0, $nextposition + 3, $strcode);

    // Generate the data for the body of the spreadsheet
    $i = 0;
    $row = 1;
    if ($users) {
        foreach ($users as $user) {
            $myxls->write_string($row, 0, $user->lastname);
            $myxls->write_string($row, 1, $user->firstname);
            $nextposition = 2;
            foreach ($extrafields as $field) {
                $myxls->write_string($row, $nextposition, $user->$field);
                $nextposition++;
            }
            $ug2 = '';
            if ($usergrps = groups_get_all_groups($course->id, $user->id)) {
                foreach ($usergrps as $ug) {
                    $ug2 = $ug2 . $ug->name;
                }
            }
            $myxls->write_string($row, $nextposition, $ug2);
            $myxls->write_string($row, $nextposition + 1, userdate($user->timecreated));
            $myxls->write_string($row, $nextposition + 2, certificate_get_grade($certificate, $course, $user->id));
            $myxls->write_string($row, $nextposition + 3, $user->code);
            $row++;
        }
        $pos = 6;
    }
    // Close the workbook
    $workbook->close();
    exit;
}

if ($download == "txt") {
    $filename = certificate_get_certificate_filename($certificate, $cm, $course) . '.txt';

    header("Content-Type: application/download\n");
    header("Content-Disposition: attachment; filename=\"$filename\"");
    header("Expires: 0");
    header("Cache-Control: must-revalidate,post-check=0,pre-check=0");
    header("Pragma: public");

    // Print names of all the fields
    echo get_string("lastname"). "\t" .get_string("firstname") . "\t";
    foreach ($extrafields as $field) {
        echo get_user_field_name($field) . "\t";
    }
    echo get_string("group"). "\t";
    echo $strdate. "\t";
    echo $strgrade. "\t";
    echo $strcode. "\n";

    // Generate the data for the body of the spreadsheet
    $i=0;
    $row=1;
    if ($users) foreach ($users as $user) {
        echo $user->lastname;
        echo "\t" . $user->firstname . "\t";
        foreach ($extrafields as $field) {
            echo $user->$field . "\t";
        }
        $ug2 = '';
        if ($usergrps = groups_get_all_groups($course->id, $user->id)) {
            foreach ($usergrps as $ug) {
                $ug2 = $ug2. $ug->name;
            }
        }
        echo $ug2 . "\t";
        echo userdate($user->timecreated) . "\t";
        echo certificate_get_grade($certificate, $course, $user->id) . "\t";
        echo $user->code . "\n";
        $row++;
    }
    exit;
}

$usercount = count(certificate_get_issues($certificate->id, $DB->sql_fullname(), $groupmode, $cm));

// Create the table for the users
$table = new html_table();
$table->width = "95%";
$table->tablealign = "center";
$table->head = array($strto);
$table->align = array('left');
foreach ($extrafields as $field) {
    $table->head[] = get_user_field_name($field);
    $table->align[] = 'left';
}
$table->head = array_merge($table->head, array($strdate, $strgrade, $strcode));
$table->align = array_merge($table->align, array('left', 'center', 'center'));
foreach ($users as $user) {
    $name = $OUTPUT->user_picture($user) . fullname($user);
    $date = userdate($user->timecreated) . certificate_print_user_files($certificate, $user->id, $context->id);
    $code = $user->code;
    $data = array();
    $data[] = $name;
    foreach ($extrafields as $field) {
        $data[] = $user->$field;
    }
    $data = array_merge($data, array($date, certificate_get_grade($certificate, $course, $user->id), $code));
    $table->data[] = $data;
}

// Create table to store buttons
$tablebutton = new html_table();
$tablebutton->attributes['class'] = 'downloadreport';
$btndownloadods = $OUTPUT->single_button(new moodle_url("report.php", array('id'=>$cm->id, 'download'=>'ods')), get_string("downloadods"));
$btndownloadxls = $OUTPUT->single_button(new moodle_url("report.php", array('id'=>$cm->id, 'download'=>'xls')), get_string("downloadexcel"));
$btndownloadtxt = $OUTPUT->single_button(new moodle_url("report.php", array('id'=>$cm->id, 'download'=>'txt')), get_string("downloadtext"));
$tablebutton->data[] = array($btndownloadods, $btndownloadxls, $btndownloadtxt);

echo $OUTPUT->header();
groups_print_activity_menu($cm, $CFG->wwwroot . '/mod/certificate/report.php?id='.$id);
echo $OUTPUT->heading(get_string('modulenameplural', 'certificate'));
echo $OUTPUT->paging_bar($usercount, $page, $perpage, $url);
echo '<br />';
echo html_writer::table($table);
echo html_writer::tag('div', html_writer::table($tablebutton), array('style' => 'margin:auto; width:50%'));
echo $OUTPUT->footer($course);