<?php
/* For licensing terms, see /license.txt */

/**
 * Responses to AJAX calls
 */

require_once '../global.inc.php';
$debug = false;
api_protect_course_script(true);

$action = $_REQUEST['a'];
$course_id = api_get_course_int_id();

if ($debug) {
    error_log("$action ajax call");
}

$session_id = isset($_REQUEST['session_id']) ? intval($_REQUEST['session_id']) : api_get_session_id();
$course_code = isset($_REQUEST['cidReq']) ? $_REQUEST['cidReq'] : api_get_course_id();

switch ($action) {
    case 'get_live_stats':
        if (!api_is_allowed_to_edit(null, true)) {
            break;
        }

        // 1. Setting variables needed by jqgrid
        $action         = $_GET['a'];
        $exercise_id    = intval($_GET['exercise_id']);
        $page           = intval($_REQUEST['page']); //page
        $limit          = intval($_REQUEST['rows']); //quantity of rows
        $sidx           = $_REQUEST['sidx'];         //index to filter
        $sord           = $_REQUEST['sord'];         //asc or desc

        if (!in_array($sord, array('asc','desc'))) {
            $sord = 'desc';
        }
        // get index row - i.e. user click to sort $sord = $_GET['sord'];
        // get the direction
        if (!$sidx) {
            $sidx = 1;
        }

        $track_exercise = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $user_table = Database::get_main_table(TABLE_MAIN_USER);
        $track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

        $minutes = intval($_REQUEST['minutes']);
        $now = time() - 60 * $minutes;
        $now = api_get_utc_datetime($now);

        $where_condition = " orig_lp_id = 0 AND exe_exo_id = $exercise_id AND start_date > '$now' ";
        $sql    = "SELECT COUNT(DISTINCT exe_id) FROM $track_exercise WHERE $where_condition ";
        $result = Database::query($sql);
        $count  = Database::fetch_row($result);
        $count  = $count[0];

        //3. Calculating first, end, etc

        $total_pages = 0;
        if ($count > 0) {
            if (!empty($limit)) {
                $total_pages = ceil($count/$limit);
            }
        }

        if ($page > $total_pages) {
            $page = $total_pages;
        }

        $start = $limit * $page - $limit;
        if ($start < 0) {
            $start = 0;
        }

        $sql = "SELECT
                    exe_id,
                    exe_user_id,
                    firstname,
                    lastname,
                    aa.status,
                    start_date,
                    exe_result,
                    exe_weighting,
                    exe_result/exe_weighting as score,
                    exe_duration,
                    questions_to_check,
                    orig_lp_id
                FROM $user_table u
                INNER JOIN (
                    SELECT
                    t.exe_id,
                    t.exe_user_id,
                    status,
                    start_date,
                    exe_result,
                    exe_weighting,
                    exe_result/exe_weighting as score,
                    exe_duration,
                    questions_to_check,
                    orig_lp_id
                    FROM  $track_exercise  t
                    LEFT JOIN $track_attempt a
                    ON (a.exe_id = t.exe_id AND t.exe_user_id = a.user_id )
                    WHERE t.status = 'incomplete' AND $where_condition
                    GROUP BY exe_user_id
                ) as aa
                ON aa.exe_user_id = user_id
                ORDER BY $sidx $sord
                LIMIT $start, $limit";

        $result = Database::query($sql);
        $results = array();
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $results[] = $row;
        }

        $oExe = new exercise();
        $oExe->read($exercise_id);

        $response = new stdClass();
        $response->page     = $page;
        $response->total    = $total_pages;
        $response->records  = $count;
        $i=0;

        if (!empty($results)) {
            foreach ($results as $row) {
                $sql = "SELECT SUM(count_question_id) as count_question_id
                        FROM (
                            SELECT 1 as count_question_id
                            FROM $track_attempt a
                            WHERE
                              user_id = {$row['exe_user_id']} AND
                              exe_id = {$row['exe_id']}
                            GROUP by question_id
                        ) as count_table";
                $result_count = Database::query($sql);
                $count_questions = Database::fetch_array($result_count,'ASSOC');
                $count_questions = $count_questions['count_question_id'];

                $row['count_questions'] = $count_questions;

                $response->rows[$i]['id'] = $row['exe_id'];
                $remaining = strtotime($row['start_date'])+($oExe->expired_time*60) - strtotime(api_get_utc_datetime(time()));
                $h = floor($remaining/3600);
                $m = floor(($remaining - ($h*3600))/60);
                $s = ($remaining - ($h*3600) - ($m*60));
                $array = array(
                    $row['firstname'],
                    $row['lastname'],
                    api_format_date($row['start_date'], DATE_TIME_FORMAT_LONG).' ['.($h>0?$h.':':'').sprintf("%02d",$m).':'.sprintf("%02d",$s).']',
                    $row['count_questions'],
                    round($row['score']*100).'%'
                );
                $response->rows[$i]['cell'] = $array;
                $i++;
            }
        }
        echo json_encode($response);
        break;
    case 'update_exercise_list_order':
        if (api_is_allowed_to_edit(null, true)) {
            $new_list = $_REQUEST['exercise_list'];
            $table = Database::get_course_table(TABLE_QUIZ_ORDER);
            $counter = 1;
            //Drop all
            Database::query("DELETE FROM $table WHERE session_id = $session_id AND c_id = $course_id");
            //Insert all
            foreach ($new_list as $new_order_id) {
                Database::insert(
                    $table,
                    array(
                        'exercise_order' => $counter,
                        'session_id' => $session_id,
                        'exercise_id' => intval($new_order_id),
                        'c_id' => $course_id
                    )
                );
                $counter++;
            }
            Display::display_confirmation_message(get_lang('Saved'));
        }
        break;
    case 'update_question_order':
        $course_info = api_get_course_info_by_id($course_id);
        $course_id = $course_info['real_id'];
        $exercise_id = isset($_REQUEST['exercise_id']) ? $_REQUEST['exercise_id'] : null;

        if (empty($exercise_id)) {
            return Display::display_error_message(get_lang('Error'));
        }
        if (api_is_allowed_to_edit(null, true)) {
            $new_question_list = $_POST['question_id_list'];
            $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
            $counter = 1;
            foreach ($new_question_list as $new_order_id) {
                Database::update(
                    $TBL_QUESTIONS,
                    array('question_order' => $counter),
                    array('question_id = ? AND c_id = ? AND exercice_id = ? ' => array(intval($new_order_id), $course_id, $exercise_id)))
                ;
                $counter++;
            }
            Display::display_confirmation_message(get_lang('Saved'));
        }
        break;
    case 'add_question_to_reminder':
        /** @var Exercise $objExercise */
        $objExercise  = $_SESSION['objExercise'];
        if (empty($objExercise)) {
            echo 0;
            exit;
        } else {
            $objExercise->edit_question_to_remind(
                $_REQUEST['exe_id'],
                $_REQUEST['question_id'],
                $_REQUEST['action']
            );
        }
        break;
    case 'save_exercise_by_now':
        $course_info = api_get_course_info_by_id($course_id);
        $course_id = $course_info['real_id'];

        // Use have permissions?
        if (api_is_allowed_to_session_edit()) {

            // "all" or "simple" strings means that there's one or all questions exercise type
            $type = isset($_REQUEST['type']) ? $_REQUEST['type'] : null;

            // Questions choices.
            $choice = isset($_REQUEST['choice']) ? $_REQUEST['choice'] : null;

            // Hot spot coordinates from all questions.
            $hot_spot_coordinates = isset($_REQUEST['hotspot']) ? $_REQUEST['hotspot'] : null;

            // There is a reminder?
            $remind_list = isset($_REQUEST['remind_list']) && !empty($_REQUEST['remind_list']) ? array_keys($_REQUEST['remind_list']) : null;

            // Needed in manage_answer.
            $learnpath_id = isset($_REQUEST['learnpath_id']) ? intval($_REQUEST['learnpath_id']) : 0;
            $learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? intval($_REQUEST['learnpath_item_id']) : 0;

            // Attempt id.
            $exe_id = $_REQUEST['exe_id'];

            if ($debug) {
                error_log("exe_id = $exe_id");
                error_log("type = $type");
                error_log("choice = ".print_r($choice, 1)." ");
                error_log("hot_spot_coordinates = ".print_r($hot_spot_coordinates, 1));
                error_log("remind_list = ".print_r($remind_list, 1));
            }

            // Exercise information.
            /** @var Exercise $objExercise */
            $objExercise = isset($_SESSION['objExercise']) ? $_SESSION['objExercise'] : null;

            // Question info.
            $question_id = isset($_REQUEST['question_id']) ? intval($_REQUEST['question_id']) : null;
            $question_list = $_SESSION['questionList'];

            // If exercise or question is not set then exit.
            if (empty($question_list) || empty($objExercise)) {
                echo 'error';
                if ($debug) {
                    if (empty($question_list)) {
                        error_log("question_list is empty");
                    }
                    if (empty($objExercise)) {
                        error_log("objExercise is empty");
                    }
                }
                exit;
            }

            // Getting information of the current exercise.
            $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exe_id);
            $exercise_id = $exercise_stat_info['exe_exo_id'];
            $attempt_list = array();

            // First time here we create an attempt (getting the exe_id).
            if (empty($exercise_stat_info)) {

            } else {
                // We know the user we get the exe_id.
                $exe_id = $exercise_stat_info['exe_id'];
                $total_score = $exercise_stat_info['exe_result'];

                //Getting the list of attempts
                $attempt_list = Event::getAllExerciseEventByExeId($exe_id);
            }

            // Updating Reminder algorythm.
            if ($objExercise->type == ONE_PER_PAGE) {
                $bd_reminder_list = explode(',', $exercise_stat_info['questions_to_check']);

                if (empty($remind_list)) {
                    $remind_list = $bd_reminder_list;
                    $new_list = array();
                    foreach ($bd_reminder_list as $item) {
                        if ($item != $question_id) {
                            $new_list[] = $item;
                        }
                    }
                    $remind_list = $new_list;
                } else {
                    if (isset($remind_list[0])) {
                        if (!in_array($remind_list[0], $bd_reminder_list)) {
                            array_push($bd_reminder_list, $remind_list[0]);
                        }
                        $remind_list = $bd_reminder_list;
                    }
                }
            }

            // No exe id? Can't save answer.
            if (empty($exe_id)) {
                // Fires an error.
                echo 'error';
                if ($debug) {
                    error_log("exe_id is empty");
                }
                exit;
            } else {
                $_SESSION['exe_id'] = $exe_id;
            }

            // Getting the total weight if the request is simple
            $total_weight = 0;

            if ($type == 'simple') {
                foreach ($question_list as $my_question_id) {
                    $objQuestionTmp  = Question::read($my_question_id, $course_id);
                    $total_weight   += $objQuestionTmp->selectWeighting();
                }
            }
            unset($objQuestionTmp);

            // Looping the question list

            foreach ($question_list as $my_question_id) {
                if ($debug) {
                    error_log("Saving question_id = $my_question_id ");
                }

                if ($type == 'simple' && $question_id != $my_question_id) {
                    continue;
                }

                $my_choice = isset($choice[$my_question_id]) ?
                    $choice[$my_question_id] : null;

                if ($debug) {
                    error_log("my_choice = ".print_r($my_choice, 1)."");
                }

                // Creates a temporary Question object
                $objQuestionTmp = Question::read($my_question_id, $course_id);

                // Getting free choice data.
                if ($objQuestionTmp->type  == FREE_ANSWER && $type == 'all') {
                    $my_choice = isset($_REQUEST['free_choice'][$my_question_id]) && !empty($_REQUEST['free_choice'][$my_question_id]) ? $_REQUEST['free_choice'][$my_question_id]: null;
                }

                if ($type == 'all') {
                    $total_weight += $objQuestionTmp->selectWeighting();
                }

                // This variable came from exercise_submit_modal.php.
                $hotspot_delineation_result = null;
                if (isset($_SESSION['hotspot_delineation_result']) && isset($_SESSION['hotspot_delineation_result'][$objExercise->selectId()])) {
                    $hotspot_delineation_result = $_SESSION['hotspot_delineation_result'][$objExercise->selectId()][$my_question_id];
                }

                if ($type == 'simple') {
                    // Getting old attempt in order to decrees the total score.
                    $old_result = $objExercise->manage_answer(
                        $exe_id,
                        $my_question_id,
                        null,
                        'exercise_show',
                        array(),
                        false,
                        true,
                        false,
                        $objExercise->selectPropagateNeg(),
                        array()
                    );

                    // Removing old score.
                    $total_score = $total_score - $old_result['score'];
                }

                // Deleting old attempt
                if (isset($attempt_list) && !empty($attempt_list[$my_question_id])) {
                    if ($debug) {
                        error_log("delete_attempt  exe_id : $exe_id, my_question_id: $my_question_id");
                    }
                    Event::delete_attempt(
                        $exe_id,
                        api_get_user_id(),
                        $course_id,
                        $session_id,
                        $my_question_id
                    );
                    if ($objQuestionTmp->type  == HOT_SPOT) {
                        Event::delete_attempt_hotspot(
                            $exe_id,
                            api_get_user_id(),
                            $course_id,
                            $session_id,
                            $my_question_id
                        );
                    }

                    if (isset($attempt_list[$my_question_id]) &&
                        isset($attempt_list[$my_question_id]['marks'])
                    ) {
                        $total_score -= $attempt_list[$my_question_id]['marks'];
                    }
                }

                // We're inside *one* question. Go through each possible answer for this question
                $result = $objExercise->manage_answer(
                    $exe_id,
                    $my_question_id,
                    $my_choice,
                    'exercise_result',
                    $hot_spot_coordinates,
                    true,
                    false,
                    false,
                    $objExercise->selectPropagateNeg(),
                    $hotspot_delineation_result
                );

                //  Adding the new score.
                $total_score += $result['score'];

                if ($debug) {
                    error_log("total_score: $total_score ");
                    error_log("total_weight: $total_weight ");
                }

                $duration = 0;
                $now = time();

                if ($type == 'all') {
                    $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exe_id);
                }

                $key = ExerciseLib::get_time_control_key(
                    $exercise_id,
                    $exercise_stat_info['orig_lp_id'],
                    $exercise_stat_info['orig_lp_item_id']
                );

                if (isset($_SESSION['duration_time'][$key]) && !empty($_SESSION['duration_time'][$key])) {
                    $duration = $now - $_SESSION['duration_time'][$key];
                    if (!empty($exercise_stat_info['exe_duration'])) {
                        $duration += $exercise_stat_info['exe_duration'];
                    }
                    $duration = intval($duration);
                } else {
                    if (!empty($exercise_stat_info['exe_duration'])) {
                        $duration = $exercise_stat_info['exe_duration'];
                    }
                }

                $_SESSION['duration_time'][$key] = time();

                Event::update_event_exercice(
                    $exe_id,
                    $objExercise->selectId(),
                    $total_score,
                    $total_weight,
                    $session_id,
                    $exercise_stat_info['orig_lp_id'],
                    $exercise_stat_info['orig_lp_item_id'],
                    $exercise_stat_info['orig_lp_item_view_id'],
                    $duration,
                    $question_list,
                    'incomplete',
                    $remind_list
                );

                 // Destruction of the Question object
                unset($objQuestionTmp);
                if ($debug) {
                    error_log(" -- end question -- ");
                }
            }
            if ($debug) {
                error_log(" ------ end ajax call ------- ");
            }
        }

        if ($objExercise->type == ONE_PER_PAGE) {
            echo 'one_per_page';
            exit;
        }
        echo 'ok';
        break;
    default:
        echo '';
}
exit;
