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/**
* This files plays the game "Snakes and Ladders".
*
* @package mod_game
* @copyright 2007 Vasilis Daloukas
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Plays the game "Snakes and Ladders".
*
* @param int $id
* @param stdClass $game
* @param stdClass $attempt
* @param stdClass $snakes
* @param stdClass $context
*/
function game_snakes_continue( $id, $game, $attempt, $snakes, $context) {
if ($attempt != false and $snakes != false) {
return game_snakes_play( $id, $game, $attempt, $snakes, $context);
}
if ($attempt === false) {
$attempt = game_addattempt( $game);
}
$newrec = new stdClass();
$newrec->id = $attempt->id;
$newrec->snakesdatabaseid = $game->param3;
if ($newrec->snakesdatabaseid == 0) {
$newrec->snakesdatabaseid = 1;
}
$newrec->position = 1;
$newrec->queryid = 0;
$newrec->dice = rand( 1, 6);
if (!game_insert_record( 'game_snakes', $newrec)) {
print_error( 'game_snakes_continue: error inserting in game_snakes');
}
game_updateattempts( $game, $attempt, 0, 0);
return game_snakes_play( $id, $game, $attempt, $newrec, $context);
}
/**
* Plays the game "Snakes and Ladders".
*
* @param int $id
* @param stdClass $game
* @param stdClass $attempt
* @param stdClass $snakes
* @param stdClass $context
*/
function game_snakes_play( $id, $game, $attempt, $snakes, $context) {
global $CFG, $DB, $OUTPUT;
$board = game_snakes_get_board( $game);
$showboard = false;
if ($snakes->position > $board->usedcols * $board->usedrows && $snakes->queryid <> 0) {
$finish = true;
if (! $cm = $DB->get_record('course_modules', array( 'id' => $id))) {
print_error("Course Module ID was incorrect id=$id");
}
echo ''.get_string( 'win', 'game').'
';
echo '
';
echo "wwwroot/mod/game/attempt.php?id=$id\">".
get_string( 'nextgame', 'game').' ';
echo "wwwroot/course/view.php?id=$cm->course\">".get_string( 'finish', 'game').' ';
$gradeattempt = 1;
$finish = 1;
game_updateattempts( $game, $attempt, $gradeattempt, $finish);
} else {
$finish = false;
if ($snakes->queryid == 0) {
game_snakes_computenextquestion( $game, $snakes, $query);
} else {
$query = $DB->get_record( 'game_queries', array( 'id' => $snakes->queryid));
}
if ($game->toptext != '') {
echo $game->toptext.'
';
}
$showboard = true;
}
if ($showboard and $game->param8 == 0) {
game_snakes_showquestion( $id, $game, $snakes, $query, $context);
}
?>
bottomtext != '') {
echo '
'.$game->bottomtext;
}
if ($showboard and $game->param8 != 0) {
game_snakes_showquestion( $id, $game, $snakes, $query, $context);
}
}
/**
* Show dice
*
* @param stdClass $snakes
* @param boolean $board
*/
function game_snakes_showdice( $snakes, $board) {
$pos = game_snakes_computeplayerposition( $snakes, $board);
?>
position - 1) % $board->usedcols;
$y = floor( ($snakes->position - 1) / $board->usedcols);
$cellwidth = ($board->width - $board->headerx - $board->footerx) / $board->usedcols;
$cellheight = ($board->height - $board->headery - $board->footery) / $board->usedrows;
$pos = new stdClass();
$pos->width = 22;
$pos->height = 22;
$pos->ofsx = 0;
$pos->ofsy = $pos->height;
switch( $board->direction) {
case 1:
if (($y % 2) == 1) {
$x = $board->usedcols - $x - 1;
}
$pos->x = $board->headerx + $x * $cellwidth + ($cellwidth - $pos->width) / 2 + $pos->ofsx;
$pos->y = $board->footery + $y * $cellheight + ($cellheight - $pos->height) / 2 + $pos->ofsy;
$pos->x = round( $pos->x);
$pos->y = round( -$pos->y);
break;
}
return $pos;
}
/**
* Computes next question.
*
* @param stdClass $game
* @param stdClass $snakes
* @param stdClass $query
*/
function game_snakes_computenextquestion( $game, &$snakes, &$query) {
global $DB, $USER;
// Retrieves CONST_GAME_TRIES_REPETITION words and select the one which is used fewer times.
if (($recs = game_questions_selectrandom( $game, 1, CONST_GAME_TRIES_REPETITION)) == false) {
return false;
}
$glossaryid = 0;
$questionid = 0;
$minnum = 0;
$query = new stdClass();
foreach ($recs as $rec) {
$a = array( 'gameid' => $game->id, 'userid' => $USER->id,
'questionid' => $rec->questionid, 'glossaryentryid' => $rec->glossaryentryid);
if (($rec2 = $DB->get_record('game_repetitions', $a, 'id,repetitions AS r')) != false) {
if (($rec2->r < $minnum) or ($minnum == 0)) {
$minnum = $rec2->r;
$query->glossaryentryid = $rec->glossaryentryid;
$query->questionid = $rec->questionid;
}
} else {
$query->glossaryentryid = $rec->glossaryentryid;
$query->questionid = $rec->questionid;
break;
}
}
if (($query->glossaryentryid == 0) and ($query->questionid == 0)) {
return false;
}
$query->gamekind = $game->gamekind;
$query->attemptid = $snakes->id;
$query->gameid = $game->id;
$query->userid = $USER->id;
$query->sourcemodule = $game->sourcemodule;
$query->score = 0;
$query->timelastattempt = time();
if (!($query->id = $DB->insert_record( 'game_queries', $query))) {
print_error( "Can't insert to table game_queries");
}
$snakes->queryid = $query->id;
$updrec = new stdClass();
$updrec->id = $snakes->id;
$updrec->queryid = $query->id;
$updrec->dice = $snakes->dice = rand( 1, 6);
if (!$DB->update_record( 'game_snakes', $updrec)) {
print_error( 'game_questions_selectrandom: error updating in game_snakes');
}
game_update_repetitions($game->id, $USER->id, $query->questionid, $query->glossaryentryid);
return true;
}
/**
* Shows the question.
*
* @param int $id
* @param stdClass $game
* @param stdClass $snakes
* @param stdClass $query
* @param stdClass $context
*/
function game_snakes_showquestion( $id, $game, $snakes, $query, $context) {
if ($game->sourcemodule == 'glossary') {
game_snakes_showquestion_glossary( $id, $snakes, $query, $game);
} else {
game_snakes_showquestion_question( $game, $id, $snakes, $query, $context);
}
}
/**
* Shows the question.
*
* @param stdClass $game
* @param int $id
* @param stdClass $snakes
* @param stdClass $query
* @param stdClass $context
*/
function game_snakes_showquestion_question( $game, $id, $snakes, $query, $context) {
global $CFG;
$questionlist = $query->questionid;
$questions = game_sudoku_getquestions( $questionlist);
// Start the form.
echo "\n";
}
/**
* Show a glossary question.
*
* @param int $id
* @param stdClass $snakes
* @param stdClass $query
* @param stdClass $game
*/
function game_snakes_showquestion_glossary( $id, $snakes, $query, $game) {
global $CFG, $DB;
$entry = $DB->get_record( 'glossary_entries', array('id' => $query->glossaryentryid));
// Start the form.
echo "\n";
}
/**
* Checks if answer is correct.
*
* @param int $id
* @param stdClass $game
* @param stdClass $attempt
* @param stdClass $snakes
* @param stdClass $context
*/
function game_snakes_check_questions( $id, $game, $attempt, $snakes, $context) {
global $CFG, $DB;
$responses = data_submitted();
if ($responses->queryid != $snakes->queryid) {
game_snakes_play( $id, $game, $attempt, $snakes, $context);
return;
}
$questionlist = $DB->get_field( 'game_queries', 'questionid', array( 'id' => $responses->queryid));
$questions = game_sudoku_getquestions( $questionlist);
$correct = false;
$query = '';
foreach ($questions as $question) {
$query = new stdClass();
$query->id = $snakes->queryid;
$grade = game_grade_responses( $question, $responses, 100, $answertext, $answered);
if ($grade < 99) {
// Wrong answer.
game_update_queries( $game, $attempt, $query, 0, $answertext);
continue;
}
// Correct answer.
$correct = true;
game_update_queries( $game, $attempt, $query, 1, '');
}
// Set the grade of the whole game.
game_snakes_position( $id, $game, $attempt, $snakes, $correct, $query, $context);
}
/**
* Checks if the glossary answer is correct.
*
* @param int $id
* @param stdClass $game
* @param stdClass $attempt
* @param stdClass $snakes
* @param stdClass $context
*/
function game_snakes_check_glossary( $id, $game, $attempt, $snakes, $context) {
global $CFG, $DB;
$responses = data_submitted();
if ($responses->queryid != $snakes->queryid) {
game_snakes_play( $id, $game, $attempt, $snakes, $context);
return;
}
$query = $DB->get_record( 'game_queries', array( 'id' => $responses->queryid));
$glossaryentry = $DB->get_record( 'glossary_entries', array( 'id' => $query->glossaryentryid));
$name = 'resp'.$query->glossaryentryid;
$useranswer = $responses->answer;
if (game_upper( $useranswer) != game_upper( $glossaryentry->concept)) {
// Wrong answer.
$correct = false;
game_update_queries( $game, $attempt, $query, 0, $useranswer); // Last param is grade.
} else {
// Correct answer.
$correct = true;
game_update_queries( $game, $attempt, $query, 1, $useranswer); // Last param is grade.
}
// Set the grade of the whole game.
game_snakes_position( $id, $game, $attempt, $snakes, $correct, $query, $context);
}
/**
* Computes the position.
*
* @param int $id
* @param stdClass $game
* @param stdClass $attempt
* @param stdClass $snakes
* @param boolean $correct
* @param stdClasss $query
* @param stdClass $context
*/
function game_snakes_position( $id, $game, $attempt, $snakes, $correct, $query, $context) {
global $DB;
$data = $DB->get_field( 'game_snakes_database', 'data', array( 'id' => $snakes->snakesdatabaseid));
if ($correct) {
if (($next = game_snakes_foundlander( $snakes->position + $snakes->dice, $data))) {
$snakes->position = $next;
} else {
$snakes->position = $snakes->position + $snakes->dice;
}
} else {
if (($next = game_snakes_foundsnake( $snakes->position, $data))) {
$snakes->position = $next;
}
}
$updrec = new stdClass();
$updrec->id = $snakes->id;
$updrec->position = $snakes->position;
$updrec->queryid = 0;
if (!$DB->update_record( 'game_snakes', $updrec)) {
print_error( "game_snakes_position: Can't update game_snakes");
}
$board = $DB->get_record_select( 'game_snakes_database', "id=$snakes->snakesdatabaseid");
$gradeattempt = $snakes->position / ($board->usedcols * $board->usedrows);
$finished = ( $snakes->position > $board->usedcols * $board->usedrows ? 1 : 0);
game_updateattempts( $game, $attempt, $gradeattempt, $finished);
game_snakes_computenextquestion( $game, $snakes, $query);
game_snakes_play( $id, $game, $attempt, $snakes, $context);
}
/**
* In lander go forward.
*
* @param int $position
* @param string $data
*/
function game_snakes_foundlander( $position, $data) {
preg_match( "/L$position-([0-9]*)/", $data, $matches);
if (count( $matches)) {
return $matches[ 1];
}
return 0;
}
/**
* In snake go backward.
*
* @param int $position
* @param string $data
*/
function game_snakes_foundsnake( $position, $data) {
preg_match( "/S([0-9]*)-$position,/", $data.',', $matches);
if (count( $matches)) {
return $matches[ 1];
}
return 0;
}
/**
* Removes attempt data.
*
* @param int $questionusageid
* @param int $questionid
*/
function game_snakes_remove_attemptdata ($questionusageid, $questionid) {
global $DB;
$sql = "SELECT qas.id
FROM mdl_question_attempts qa
LEFT JOIN mdl_question_attempt_steps qas
ON qa.id=qas.questionattemptid
WHERE questionusageid = $questionusageid
AND questionid = $questionid
AND state != 'todo'";
if ($stepdata = $DB->get_records_sql($sql)) {
foreach ($stepdata as $step) {
if ($step->id > 0) {
$DB->delete_records('question_attempt_step_data', array('attemptstepid' => $step->id));
$DB->get_records_sql("update {question_attempt_steps} set state='todo' where id = {$step->id}");
}
}
}
}
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