<?php

/* For licensing terms, see /license.txt */

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

api_protect_course_script(true);

$isAllowedToEdit = api_is_allowed_to_edit(null, true);

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

$exerciseId = isset($_REQUEST['id']) ? (int) $_REQUEST['id'] : 0;
$exportXls = isset($_REQUEST['export_xls']) && !empty($_REQUEST['export_xls']) ? (int) $_REQUEST['export_xls'] : 0;
$groups = $_REQUEST['groups'] ?? [];
$users = $_REQUEST['users'] ?? [];

if (empty($exerciseId)) {
    api_not_allowed(true);
}

$sessionId = api_get_session_id();

$exercise = new Exercise();
$result = $exercise->read($exerciseId);

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

$nameTools = get_lang('ExerciseManagement');
$interbreadcrumb[] = [
    'url' => 'exercise.php?'.api_get_cidreq(),
    'name' => get_lang('Exercises'),
];
$interbreadcrumb[] = [
    'url' => 'admin.php?exerciseId='.$exercise->iid.'&'.api_get_cidreq(),
    'name' => $exercise->selectTitle(true),
];

$interbreadcrumb[] = [
    'url' => 'exercise_report.php?'.api_get_cidreq().'&exerciseId='.$exercise->iid,
    'name' => get_lang('StudentScore'),
];
$courseId = api_get_course_int_id();
$courseInfo = api_get_course_info();

$form = new FormValidator('search_form', 'GET', api_get_self().'?id='.$exerciseId.'&'.api_get_cidreq());
$form->addCourseHiddenParams();
$form->addHidden('id', $exerciseId);

$courseGroups = GroupManager::get_group_list(null, $courseInfo);

if (!empty($courseGroups)) {
    $courseGroups = array_column($courseGroups, 'name', 'iid');
    $form->addSelect(
        'groups',
        get_lang('Groups'),
        $courseGroups,
        [
            'multiple' => true,
        ]
    );
}

$courseUsers = CourseManager::get_user_list_from_course_code($courseInfo['code']);
if (!empty($courseUsers)) {
    array_walk(
        $courseUsers,
        function (&$data, $key) {
            $data = api_get_person_name($data['firstname'], $data['lastname']);
        }
    );
}

$form->addSelect(
    'users',
    get_lang('Users'),
    $courseUsers,
    [
        'multiple' => true,
    ]
);

$form->addButtonSearch(get_lang('Search'), 'searchSubmit');

$formToString = $form->toHtml();

$table = new HTML_Table(['class' => 'table table-hover table-striped']);
$row = 0;
$column = 0;
$headers = [
    get_lang('Question'),
    get_lang('WrongAnswer').' / '.get_lang('Total'),
    '%',
];

foreach ($headers as $header) {
    $table->setHeaderContents($row, $column, $header);
    $column++;
}
if ($exportXls) {
    $tableXls[] = $headers;
}
$row++;
$scoreDisplay = new ScoreDisplay();
$orderedData = [];
if ($form->validate()) {
    $questions = ExerciseLib::getWrongQuestionResults($courseId, $exerciseId, $sessionId, $groups, $users);
    foreach ($questions as $data) {
        $questionId = (int) $data['question_id'];
        $total = ExerciseLib::getTotalQuestionAnswered(
            $courseId,
            $exerciseId,
            $questionId,
            $sessionId,
            $groups,
            $users
        );
        $ordered = [
            $data['question'],
            $data['count'].' / '.$total,
            $scoreDisplay->display_score([$data['count'], $total], SCORE_AVERAGE),
        ];
        $orderedData[] = $ordered;
        if ($exportXls) {
            $tableXls[] = $ordered;
        }
    }
} else {
    $questions = ExerciseLib::getWrongQuestionResults($courseId, $exerciseId, $sessionId);
    foreach ($questions as $data) {
        $questionId = (int) $data['question_id'];
        $total = ExerciseLib::getTotalQuestionAnswered($courseId, $exerciseId, $questionId, $sessionId);
        $ordered = [
            $data['question'],
            $data['count'].' / '.$total,
            $scoreDisplay->display_score([$data['count'], $total], SCORE_AVERAGE),
        ];
        $orderedData[] = $ordered;
    }
}

$table = new SortableTableFromArray(
    $orderedData,
    0,
    100,
    'question_tracking'
);

$table->hideNavigation = true;

$table->column = 2;
$column = 0;
foreach ($headers as $header) {
    $table->set_header($column, $header, false);
    $column++;
}
if ($exportXls) {
    $fileName = get_lang('QuestionStats').'_'.api_get_course_id().'_'.$exerciseId.'_'.api_get_local_time();
    Export::arrayToXls($tableXls, $fileName);
    exit;
}
$htmlHeadXtra[] = '<script>
    $(function() {
        $("#export-xls").bind("click", function(e) {
            e.preventDefault();
            var input = $("<input>", {
                type: "hidden",
                name: "export_xls",
                value: "1"
            });
            $("#search_form").append(input);
            $("#search_form").submit();
        });
        $("#search_form_searchSubmit").bind("click", function(e) {
            e.preventDefault();
            if ($("input[name=\"export_xls\"]").length > 0) {
                $("input[name=\"export_xls\"]").remove();
            }
            $("#search_form").submit();
        });
    });
</script>';

Display::display_header($nameTools, get_lang('Exercise'));
$actions = '<a href="exercise_report.php?exerciseId='.$exerciseId.'&'.api_get_cidreq().'">'.
    Display::return_icon(
        'back.png',
        get_lang('GoBackToQuestionList'),
        '',
        ICON_SIZE_MEDIUM
    )
    .'</a>';
$actions .= Display::url(
    Display::return_icon('excel.png', get_lang('ExportAsXLS'), [], ICON_SIZE_MEDIUM),
    '#',
    ['id' => 'export-xls']
);

$actions = Display::div($actions, ['class' => 'actions']);

echo $actions;
echo $formToString;
echo $table->return_table();
Display::display_footer();