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

require_once 'exercise.class.php';
require_once 'question.class.php';
require_once 'answer.class.php';
$language_file = array('exercice', 'tracking');
require_once '../inc/global.inc.php';
$this_section = SECTION_COURSES;

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

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

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

$session_id = api_get_session_id();

if (empty($session_id)) {
    $students = CourseManager::get_student_list_from_course_code(api_get_course_int_id(), false);
} else {
    $students = CourseManager::get_student_list_from_course_code(api_get_course_int_id(), true, $session_id);
}
$count_students = count($students);

$question_list = $objExercise->getQuestionOrderedListByName();

$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('NumberOfStudentsWhoTryTheExercise'),
    get_lang('NumberStudentWhoSelectedIt'),
    get_lang('LowestScore'),
    get_lang('AverageScore'),
    get_lang('HighestScore'),
    get_lang('Weighting')
);

if (!empty($question_list)) {
    foreach ($question_list as $row) {
        $question_id = $row['question_id'];
        $question_obj   = Question::read($question_id);
        $exercise_stats = ExerciseLib::get_student_stats_by_question($question_id, $exercise_id, api_get_course_int_id(), api_get_session_id());
        $count_users    = ExerciseLib::get_number_students_question_with_answer_count($question_id, $exercise_id, api_get_course_int_id(), api_get_session_id());

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

        $data[$question_id]['students_who_try_exercise'] 	= Display::bar_progress($percentage, 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 $row) {
        $question_id = $row['question_id'];
		$question_obj = Question::read($question_id);
		$exercise_stats = ExerciseLib::get_student_stats_by_question($question_id, $exercise_id, api_get_course_int_id(), api_get_session_id());

        $answer = new Answer($question_id);
        $answer->read();
        $mainCounter = 1;
        $counter = 1;
        foreach ($answer->answer as $answer_id => $answer_item) {
            $answer_info    = $answer->selectAnswer($answer_id);
            $is_correct     = $answer->isCorrect($answer_id);
            $correct_answer = $is_correct == 1 ? get_lang('Yes') : get_lang('No');

            // 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']      = Text::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'] 	= '-';

                        $count = ExerciseLib::get_number_students_answer_count($answer_id, $question_id, $exercise_id, api_get_course_int_id(), api_get_session_id(), FILL_IN_BLANKS, $answer_info_db, $answer_item);

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

                        $id++;
                        $counter++;
                    }
                    break;
                case MATCHING:
                    if ($is_correct == 0) {
                        if ($mainCounter == 1) {
                            $data[$id]['name'] = Text::cut($question_obj->question, 100);
                        } else {
                            $data[$id]['name'] = '-';
                        }
                        $correct = '';

                        foreach ($answer->answer as $answerSubId => $answer_item) {
                            $is_correct_i = $answer->isCorrect($answerSubId);
                            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, api_get_course_int_id(), api_get_session_id(), MATCHING);
                        $percentage = 0;
                        if (!empty($count_students)) {
                            $percentage = $count/$count_students*100;
                        }
                        $data[$id]['attempts'] 	= Display::bar_progress($percentage, false, $count .' / '.$count_students);
                    }
                    break;
                case HOT_SPOT:
                    if ($mainCounter == 1) {
                        $data[$id]['name'] = Text::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, api_get_course_int_id(), api_get_session_id());
                    $percentage = 0;
                    if (!empty($count_students)) {
                        $percentage = $count/$count_students*100;
                    }
                    $data[$id]['attempts'] 	= Display::bar_progress($percentage, false, $count .' / '.$count_students);
                    break;
                default:
                    if ($mainCounter == 1) {
                        $data[$id]['name']      = Text::cut($question_obj->question, 100);
                    } else {
                        $data[$id]['name']      = '-';
                    }
                    $data[$id]['answer'] 	= $answer_info;
                    $data[$id]['correct'] 	= $correct_answer;

                    $count = ExerciseLib::get_number_students_answer_count($answer_id, $question_id, $exercise_id, api_get_course_int_id(), api_get_session_id());
                    $percentage = 0;
                    if (!empty($count_students)) {
                        $percentage = $count/$count_students*100;
                    }
                    $data[$id]['attempts'] 	= Display::bar_progress($percentage, false, $count .' / '.$count_students);
                    break;
            }
            $id++;
            $mainCounter++;
        }

    }

}


//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);

$app['title'] = get_lang('ReportByQuestion');
$tpl = $app['template'];

$actions = '<a href="exercise_report.php?exerciseId='.intval($_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();