<?php
/* See license terms in /license.txt */

require_once '../inc/global.inc.php';
$this_section = SECTION_COURSES;

$exercise_id = isset($_GET['exerciseId']) && !empty($_GET['exerciseId']) ? intval($_GET['exerciseId']) : 0;
$gradebook = isset($gradebook) ? $gradebook : null;

$objExercise = new Exercise();
$result = $objExercise->read($exercise_id);

if (!$result) {
	api_not_allowed(true);
}

$sessionId = api_get_session_id();
$courseCode = api_get_course_id();

if (empty($sessionId)) {
    $students = CourseManager :: get_student_list_from_course_code($courseCode, false);
} else {
    $students = CourseManager :: get_student_list_from_course_code($courseCode, true, $sessionId);
}
$count_students = count($students);
$question_list = $objExercise->get_validated_question_list();

$data = array();
// Question title 	# of students who tool it 	Lowest score 	Average 	Highest score 	Maximum score
$headers = array(
	get_lang('Question'),
    get_lang('QuestionType'),
    get_lang('NumberStudentWhoSelectedIt'),
	get_lang('LowestScore'),
	get_lang('AverageScore'),
	get_lang('HighestScore'),
	get_lang('Weighting')
);

if (!empty($question_list)) {
	foreach ($question_list as $question_id) {
        $question_obj = Question::read($question_id);

        $exercise_stats = ExerciseLib::get_student_stats_by_question(
            $question_id,
            $exercise_id,
            $courseCode,
            $sessionId
        );

        $count_users = ExerciseLib::get_number_students_question_with_answer_count(
            $question_id,
            $exercise_id,
            $courseCode,
            $sessionId
        );

        $data[$question_id]['name'] = cut($question_obj->question, 100);
        $data[$question_id]['type'] = $question_obj->get_question_type_name();
        $percentange = 0;
        if ($count_students) {
            $percentange = $count_users / $count_students*100;
        }

        $data[$question_id]['students_who_try_exercise'] = Display::bar_progress(
            $percentange,
            false,
            $count_users .' / '.$count_students
        );
        $data[$question_id]['lowest_score'] = round($exercise_stats['min'], 2);
        $data[$question_id]['average_score'] = round($exercise_stats['average'], 2);
        $data[$question_id]['highest_score'] = round($exercise_stats['max'], 2);
        $data[$question_id]['max_score'] = round($question_obj->weighting, 2);
	}
}

// Format A table
$table = new HTML_Table(array('class' => 'data_table'));
$row = 0;
$column = 0;
foreach ($headers as $header) {
	$table->setHeaderContents($row, $column, $header);
	$column++;
}
$row++;
foreach ($data as $row_table) {
	$column = 0;
	foreach ($row_table as $cell) {
		$table->setCellContents($row, $column, $cell);
		$table->updateCellAttributes($row, $column, 'align="center"');
		$column++;
	}
	$table->updateRowAttributes($row, $row % 2 ? 'class="row_even"' : 'class="row_odd"', true);
	$row++;
}
$content = $table->toHtml();

// Format B

$headers = array(
	get_lang('Question'),
	get_lang('Answer'),
	get_lang('Correct'),
	get_lang('NumberStudentWhoSelectedIt')
);

$data = array();

if (!empty($question_list)) {
    $id = 0;
	foreach ($question_list as $question_id) {
		$question_obj = Question::read($question_id);
        $exercise_stats = ExerciseLib::get_student_stats_by_question(
            $question_id,
            $exercise_id,
            $courseCode,
            $sessionId
        );

        $answer = new Answer($question_id);
		$answer_count = $answer->selectNbrAnswers();

        for ($answer_id = 1; $answer_id <= $answer_count; $answer_id++) {
            $answer_info = $answer->selectAnswer($answer_id);
            $is_correct = $answer->isCorrect($answer_id);
            $correct_answer = $is_correct == 1 ? get_lang('Yes') : get_lang('No');
            $real_answer_id = $answer->selectAutoId($answer_id);

            // Overwriting values depending of the question
            switch ($question_obj->type) {
                case FILL_IN_BLANKS :
                    $answer_info_db = $answer_info;
                    $answer_info = substr($answer_info, 0, strpos($answer_info, '::'));
                    $correct_answer = $is_correct;
                    $answers = $objExercise->fill_in_blank_answer_to_array($answer_info);
                    $counter = 0;
                    foreach ($answers as $answer_item) {
                        if ($counter == 0) {
                            $data[$id]['name'] = cut($question_obj->question, 100);
                        } else {
                            $data[$id]['name'] = '-';
                        }
                        $data[$id]['answer'] 	= $answer_item;

                        $answer_item = api_substr($answer_item, 1);
                        $answer_item = api_substr($answer_item, 0, api_strlen($answer_item) -1);

                        $data[$id]['correct'] 	= '-';

                        $count = ExerciseLib::get_number_students_answer_count(
                            $real_answer_id,
                            $question_id,
                            $exercise_id,
                            $courseCode,
                            $sessionId,
                            FILL_IN_BLANKS,
                            $answer_info_db,
                            $answer_item
                        );

                        $percentange = 0;
                        if (!empty($count_students)) {
                            $percentange = $count/$count_students*100;
                        }
                        $data[$id]['attempts'] = Display::bar_progress($percentange, false, $count .' / '.$count_students);

                        $id++;
                        $counter++;
                    }
                    break;
                case MATCHING:
                    //no break
                case MATCHING_DRAGGABLE:
                    if ($is_correct == 0) {
                        if ($answer_id == 1) {
                            $data[$id]['name'] = cut($question_obj->question, 100);
                        } else {
                            $data[$id]['name'] = '-';
                        }
                        $correct = '';

                        for ($i = 1; $i <= $answer_count; $i++) {
                             $is_correct_i = $answer->isCorrect($i);
                             if ($is_correct_i != 0 && $is_correct_i == $answer_id) {
                                 $correct = $answer->selectAnswer($i);
                                 break;
                             }
                        }
                        $data[$id]['answer'] = $correct;
                        $data[$id]['correct'] = $answer_info;

                        $count = ExerciseLib::get_number_students_answer_count(
                            $answer_id,
                            $question_id,
                            $exercise_id,
                            $courseCode,
                            $sessionId,
                            MATCHING
                        );
                        $percentange = 0;
                        if (!empty($count_students)) {
                            $percentange = $count/$count_students*100;
                        }
                        $data[$id]['attempts'] = Display::bar_progress($percentange, false, $count .' / '.$count_students);
                    }
                    break;
                case HOT_SPOT:
                    if ($answer_id == 1) {
                        $data[$id]['name'] = cut($question_obj->question, 100);
                    } else {
                        $data[$id]['name'] = '-';
                    }
                    $data[$id]['answer'] = $answer_info;
                    $data[$id]['correct'] = '-';

                    $count = ExerciseLib::get_number_students_answer_hotspot_count(
                        $answer_id,
                        $question_id,
                        $exercise_id,
                        $courseCode,
                        $sessionId
                    );
                    $percentange = 0;
                    if (!empty($count_students)) {
                        $percentange = $count/$count_students*100;
                    }
                    $data[$id]['attempts'] = Display::bar_progress($percentange, false, $count .' / '.$count_students);
                    break;
                default:
                    if ($answer_id == 1) {
                        $data[$id]['name'] = cut($question_obj->question, 100);
                    } else {
                        $data[$id]['name'] = '-';
                    }
                    $data[$id]['answer'] = $answer_info;
                    $data[$id]['correct'] = $correct_answer;

                    $count = ExerciseLib::get_number_students_answer_count(
                        $real_answer_id,
                        $question_id,
                        $exercise_id,
                        $courseCode,
                        $sessionId
                    );
                    $percentange = 0;
                    if (!empty($count_students)) {
                        $percentange = $count/$count_students*100;
                    }
                    $data[$id]['attempts'] = Display::bar_progress($percentange, false, $count .' / '.$count_students);
            }
            $id++;
        }

	}
}

// Format A table
$table = new HTML_Table(array('class' => 'data_table'));
$row = 0;
$column = 0;
foreach ($headers as $header) {
	$table->setHeaderContents($row, $column, $header);
	$column++;
}
$row++;
foreach ($data as $row_table) {
	$column = 0;
	foreach ($row_table as $cell) {
		$table->setCellContents($row, $column, $cell);
		$table->updateCellAttributes($row, $column, 'align="center"');
		$column++;
	}
	$table->updateRowAttributes($row, $row % 2 ? 'class="row_even"' : 'class="row_odd"', true);
	$row++;
}
$content .= $table->toHtml();


$interbreadcrumb[] = array ("url" => "exercice.php?gradebook=$gradebook", "name" => get_lang('Exercices'));
$interbreadcrumb[] = array ("url" => "admin.php?exerciseId=$exercise_id","name" => $objExercise->name);

$tpl = new Template(get_lang('ReportByQuestion'));

//$actions = array();
//$actions[]= array(get_lang('Back'), Display::return_icon('back.png', get_lang('Back'), 'exercise_report.php?'.$exercise_id));
//$tpl->set_actions($actions);

$actions = '<a href="exercise_report.php?exerciseId='.intval($_GET['exerciseId']).'">' .
    Display :: return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';
$actions = Display::div($actions, array('class'=> 'actions'));
$content = $actions.$content;
$tpl->assign('content', $content);
$tpl->display_one_col_template();
