<?php
// This file is part of
//
// 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/>.

defined('MOODLE_INTERNAL') || die();

function get_comments($cmid, $id) {
    global $DB, $USER, $CFG;
    $tp = $CFG->prefix; // gets moodle tables prefix, not everyone uses mdl_

    $sql = "
          SELECT gf.id gf_id,
                gf.grade,
                gf.comment gf_comment,
                gf.contextid gf_contextid,
                gf.fileid gf_fileid,
                gf.name gf_name,
                gs.name gs_name,
                gs.description gs_description,
                gst.name gst_name,
                gst.description gst_description,
                fileid
            FROM ".$tp."gradeimporter_feedback gf
            JOIN ".$tp."gradeimporter_submission gs
              ON gf.submissionid = gs.id
            JOIN ".$tp."gradeimporter_submissiontype gst
              ON gs.type = gst.id
          WHERE gf.studentid = ?";

    $records = $DB->get_records_sql($sql, array('studentid' => $USER->id));

    $data = array();
    if (count($records)) {
        foreach ($records as $value) {
            if (!array_key_exists($value->gst_name, $data)) {
                $data[$value->gst_name] = array();
            }

            $fileurl = buildurl($cmid, $value->gf_id, $value->gf_name);

            $data[$value->gst_name][] = array($value->gs_name, $value->grade, $value->gf_comment, $fileurl);
        }
    }

    return $data;
}


function get_teacher_view($cmid, $gradeimporterid, $enrolledusers) {
    global $DB, $CFG;

    $tp = $CFG->prefix; // gets moodle tables prefix, not everyone uses mdl_

    $table = new html_table();
    $table->align = array('center');
    $table->attributes = array('class' => 'generaltable mod_index');

    // Creates table head
    $subrow = new html_table_row();

    $cell = new html_table_cell(get_string('nameCol', 'gradeimporter'));
    $cell->style = "border:1px solid black";

    $cell->colspan = 1;
    $subrow->cells[] = $cell;
    $submissionssql = "SELECT id, name
                      FROM ".$tp."gradeimporter_submission
                      WHERE gradeimporterid = $gradeimporterid
                      ORDER BY id";
    $submissions = $DB->get_records_sql($submissionssql);
    foreach ($submissions as $submission) {
        $subname = editSub($submission->name, $gradeimporterid, $cmid, $submission->id);
        $cell = new html_table_cell($subname);
        $cell->colspan = 2;
        $cell->style = "border:1px solid black";
        $subrow->cells[] = $cell;

        // Adds 2 align, one for grade and another to the file
        $table->align[] = 'center';
        $table->align[] = 'center';
    }
    $table->data[] = $subrow;

    // All submissions names are on the table

    $sql = " SELECT gs.id gs_id,
                  gs.gradeimporterid gs_gradeimporterid,
                  gs.type gs_type,
                  gs.name gs_name,
                  gst.name  gst_name,
                  gf.id gf_id,
                  gf.studentid  gf_studentid,
                  gf.grade  gf_grade,
                  gf.fileid gf_fileid,
                  gf.contextid  gf_contextid,
                  gf.name gf_name,
                  user.firstname  user_firstname,
                  user.lastname user_lastname
                  FROM ".$tp."gradeimporter_feedback gf
                  JOIN ".$tp."user user
                      ON user.id = gf.studentid
                  JOIN ".$tp."gradeimporter_submission gs
                      ON gs.id = gf.submissionid
                  JOIN ".$tp."gradeimporter_submissiontype gst
                      ON gst.id = gs.type
                  WHERE gs.gradeimporterid = $gradeimporterid
                  ORDER BY user.firstname, user.lastname, gs.id, gf.id";
    $records = $DB->get_recordset_sql($sql);

    $userslist = array();
    foreach ($enrolledusers as $user) {
        $userslist[$user->id] = array('name' => $user->firstname." ".$user->lastname);
    }

    foreach ($records as $record) {
        $url = buildurl($cmid, $record->gf_id, $record->gf_name);
        $userslist[$record->gf_studentid][$record->gs_id] = array('grade' => $record->gf_grade, 'file' => $url);
    }

    foreach ($userslist as $user) {
        $row = new html_table_row();
        $cell = new html_table_cell($user['name']);
        $cell->style = "border:1px solid black";
        $row->cells[] = $cell;
        foreach ($submissions as $submission) {
            if (array_key_exists($submission->id, $user)) {
                $url = $user[$submission->id]['file'];
                $grade = $user[$submission->id]['grade'];
            } else {
                $url = '-';
                $grade = '-';
            }
            $cell = new html_table_cell($grade);
            $cell->style = "border:1px solid black; border-right:0";
            $row->cells[] = $cell;

            $cell = new html_table_cell($url);
            $cell->style = "border:1px solid black; border-left:0";
            $row->cells[] = $cell;
        }
        $table->data[] = $row;
    }
    echo html_writer::table($table);
}


require_once($CFG->libdir . '/filelib.php');
require_once("$CFG->libdir/csvlib.class.php");


function buildurl($cmid, $fileid, $filename) {
    $fileurl = new moodle_url("/mod/gradeimporter/view.php", array('id' => $cmid, 'fileid' => $fileid, 'filename' => $filename, 'action' => 1));
    return "<a href=$fileurl target=_blank> $filename</a>";
}

function editSub($subname, $gradeimporterid, $cmid, $subid) {
    $url = new moodle_url("/mod/gradeimporter/submission.php", array('id' => $gradeimporterid,
                                                                    'cmid' => $cmid,
                                                                    'subid' => $subid,
                                                                    'update' => 1
                                                                  )
                           );
    return $subname.'<a href='.$url.' target="_blank"><i class="icon fa fa-pencil fa-fw"  title="'
                        .get_string('editSub', 'gradeimporter')
                        .'" aria-label="'
                        .get_string('editSub', 'gradeimporter').'"></i>';
}

function exportCSV($context) {
    $enrolledusers = get_enrolled_users($context, 'mod/gradeimporter:student');
    $header = array('id', 'name', 'email', 'grade', 'comment', 'file');

    $csvexport = new csv_export_writer();
    $csvexport->set_filename('config');
    $csvexport->add_data($header);

    foreach ($enrolledusers as $value) {
        $name = $value->firstname . ' ' . $value->lastname;
        $studententry = array($value->id, $name, $value->email, '', '', '');
        $csvexport->add_data($studententry);
    }

    $csvexport->download_file();
    // $dlfile = $csvexporter->download_array('config', $data);
}