<?php

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);
  }
  //ksort($usersList);

  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);

}