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<?php
if (!function_exists('http_response_code')) {
function http_response_code($code = NULL) {
$codes = array(400 => "Bad Request",
500 => "Internal Server Error");
if (!isset($codes[$code])) {
return;
}
$protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0');
header($protocol . ' ' . $code . ' ' . $codes[$code]);
}
}
function safe_ceil($value, $precision = 1e-6) {
$ceilValue = ceil($value);
return (abs($value - $ceilValue) < (1-$precision)) ? $ceilValue : round($value);
}
function recursive_ksort(&$array, $flags = SORT_REGULAR) {
if (!is_array($array)) return false;
ksort($array, $flags);
foreach ($array as &$arr) {
recursive_ksort($arr, $flags);
}
return true;
}
class ParametersException extends Exception {};
function run($parameters) {
$versionClasses = array(
'1' => 'ApiPklV1', // RegKlas 2018.11.01
'2' => 'ApiPklV2', // RegKMP 2020.01.01
'3' => 'ApiPklV3', // local BNET 2020.05.01
'_default' => 'ApiPklV3'
);
$version = isset($parameters['version']) ? $parameters['version'] : '_default';
$apiClass = isset($versionClasses[$version]) ? $versionClasses[$version] : $versionClasses['_default'];
$api = new $apiClass($parameters);
if ($parameters['tournament_rank'] == ApiPkl::RANK_KMP) {
$result = $api->calculate_kmp_points();
} else {
$result = $api->calculate_points();
}
return $result;
}
class ApiPkl {
const RANK_KMP = 101;
protected $parameters;
function __construct($parameters) {
$this->parameters = $parameters;
$this->check_parameters($parameters);
$this->parameters = $this->parse_parameters($parameters);
}
function ensure_parameters($params) {
foreach ($params as $param) {
if (!isset($this->parameters[$param])) {
throw new ParametersException('Missing parameter: ' . $param);
}
if (!is_numeric($this->parameters[$param])) {
throw new ParametersException('Parameter: ' . $param . ' is not a numeric value (' . $this->parameters[$param] . ')');
}
}
}
function check_values($parameters, $params) {
foreach ($params as $param => $test) {
if (!$test($parameters[$param])) {
throw new ParametersException('Parameter: ' . $param . ' has incorrect value (' . $parameters[$param] . ')');
}
}
}
function check_parameters() {
$this->ensure_parameters(array('type', 'contestants', 'title_sum'));
$this->check_values($this->parameters, array(
'type' => function($r) { return ctype_digit($r) && intval($r) > 0; },
'contestants' => function($r) { return ctype_digit($r) && intval($r) > 0; },
'title_sum' => function($r) { return floatval($r) >= 0; }
));
if (isset($this->parameters['players'])) {
$this->check_values($this->parameters, array(
'players' => function($r) { return ctype_digit($r) && intval($r) > 0; }
));
}
if (!isset($this->parameters['manual']) || !isset($this->parameters['manual']['min_points']) || !isset($this->parameters['manual']['tournament_weight'])) {
$this->ensure_parameters(array('tournament_rank', 'over39_boards'));
$this->check_values($this->parameters, array(
'tournament_rank' => function($r) { return ctype_digit($r) && ((intval($r) >= 0 && intval($r) <= 7) || intval($r) == ApiPkl::RANK_KMP); },
'over39_boards' => function($r) { return ctype_digit($r) && intval($r) >= 0 && intval($r) <= 1; }
));
} else {
$this->check_values($this->parameters['manual'], array(
'min_points' => function($r) { return ctype_digit($r) && intval($r) >= 0; },
'tournament_weight' => function($r) { return ctype_digit($r) && intval($r) > 0; }
));
}
if (isset($this->parameters['manual']) && isset($this->parameters['manual']['players_coefficient'])) {
$this->check_values($this->parameters['manual'], array(
'players_coefficient' => function($r) { return floatval($r) >= 0; }
));
}
}
function parse_parameters() {
$return = array();
$return['type'] = intval($this->parameters['type']);
if ($return['type'] == 3 || $return['type'] > 4) {
throw new ParametersException('Parameter: type has incorrect value (' . $return['type'] . ')');
}
if ($return['type'] != 2 && $this->parameters['tournament_rank'] == ApiPkl::RANK_KMP) {
throw new ParametersException('Parameter: type has incorrect value (' . $return['type'] . ') for KMP tournament');
}
$return['contestants'] = intval($this->parameters['contestants']);
$return['players'] = isset($this->parameters['players']) ? intval($this->parameters['players']) : intval($this->parameters['contestants']) * $return['type'];
$return['title_sum'] = floatval($this->parameters['title_sum']);
$weights = array(
array(1, 2, 4, 5, 7, 10, 15, 25, ApiPkl::RANK_KMP => 0),
array(2, 3, 5, 7, 10, 15, 25, 40, ApiPkl::RANK_KMP => 0)
);
$return['tournament_weight'] = (isset($this->parameters['manual']) && isset($this->parameters['manual']['tournament_weight'])) ? intval($this->parameters['manual']['tournament_weight']) : $weights[intval($this->parameters['over39_boards'])][intval($this->parameters['tournament_rank'])];
$min_points = array(
array(0, 0, 0, 0, 50, 75, 150, 200, ApiPkl::RANK_KMP => 0),
array(0, 0, 0, 0, 70, 100, 200, 300, ApiPkl::RANK_KMP => 0)
);
$return['min_points'] = (isset($this->parameters['manual']) && isset($this->parameters['manual']['min_points'])) ? intval($this->parameters['manual']['min_points']) : $min_points[intval($this->parameters['over39_boards'])][intval($this->parameters['tournament_rank'])];
$return['players_coefficient'] = (isset($this->parameters['manual']) && isset($this->parameters['manual']['players_coefficient'])) ? floatval($this->parameters['manual']['players_coefficient']) : 0.05;
$return['points_cutoffs'] = (isset($this->parameters['manual']) && isset($this->parameters['manual']['points_cutoffs']) && is_array($this->parameters['manual']['points_cutoffs'])) ? $this->parameters['manual']['points_cutoffs'] : array(
array(0.0, 1.0),
array(0.02, 0.9),
array(0.2, 0.2),
array(0.5, 0.0)
);
recursive_ksort($return['points_cutoffs']);
if ($return['points_cutoffs'][0][0] != 0.0) {
array_unshift($return['points_cutoffs'], array(0.0, 1.0));
}
if ($return['points_cutoffs'][count($return['points_cutoffs'])-1][1] != 0.0) {
array_push($return['points_cutoffs'], array(1.0, 0.0));
}
foreach ($return['points_cutoffs'] as &$cutoff) {
if (($cutoff[0] < 0.0) || ($cutoff[0] > 1.0)) {
throw new ParametersException('Cutoff points need to be between 0.0 and 1.0: ' . $cutoff[0]);
}
$cutoff[0] = floatval($cutoff[0]);
if (($cutoff[1] < 0.0) || ($cutoff[1] > 1.0)) {
throw new ParametersException('Cutoff values need to be between 1.0 and 0.0: ' . $cutoff[1]);
}
$cutoff[1] = floatval($cutoff[1]);
}
unset($cutoff);
for ($prev = 0; $prev < count($return['points_cutoffs']) - 1; $prev++) {
$next = $prev + 1;
if ($return['points_cutoffs'][$prev][0] >= $return['points_cutoffs'][$next][0]) {
throw new ParametersException(
'Cutoff points need to be ascending: ' . $return['points_cutoffs'][$prev][0] . ', ' . $return['points_cutoffs'][$next][0]);
}
if ($return['points_cutoffs'][$prev][1] < $return['points_cutoffs'][$next][1]) {
throw new ParametersException(
'Cutoff values need to be non-ascending: ' . $return['points_cutoffs'][$prev][1] . ', ' . $return['points_cutoffs'][$next][1]);
}
}
return $return;
}
function get_position_percentage_from_position($position, $contestants) {
return ($position - 1) / $contestants;
}
function get_percentage_from_position($position, $contestants, $cutoffs) {
$position_percentage = $this->get_position_percentage_from_position($position, $contestants);
for ($prev = 0; $prev < count($cutoffs) - 1; $prev++) {
$next = $prev + 1;
if (($cutoffs[$prev][0] <= $position_percentage) && ($cutoffs[$next][0] >= $position_percentage)) {
$result = ($position_percentage - $cutoffs[$prev][0]) * ($cutoffs[$prev][1] - $cutoffs[$next][1]) / ($cutoffs[$prev][0] - $cutoffs[$next][0]) + $cutoffs[$prev][1];
return $result;
}
}
return 0.0;
}
function calculate_points() {
$max_points = safe_ceil(max(
$this->parameters['min_points'],
(1 + 0.25 * ($this->parameters['type'] > 2)) * (max(0.15, $this->parameters['title_sum'] / $this->parameters['players']) * $this->parameters['tournament_weight'] + $this->parameters['players_coefficient'] * $this->parameters['contestants'] * $this->parameters['type'])
));
$min_points = 1;
$result = array("sum" => 0, "points" => array());
for ($place = 1; $place <= $this->parameters['contestants']; $place++) {
$percentage = $this->get_percentage_from_position($place, $this->parameters['contestants'], $this->parameters['points_cutoffs']);
$points = safe_ceil(floatval($max_points) * $percentage);
$result['points'][$place] = max($min_points, intval($points));
$result['sum'] += $this->parameters['type'] * $result['points'][$place];
}
return $result;
}
function calculate_kmp_points() {
$max_points = safe_ceil($this->parameters['contestants'] * 0.5);
$min_points = 1;
$result = array("sum" => 0, "points" => array(1 => $max_points));
for ($place = 2; $place <= $this->parameters['contestants']; $place++) {
$result['points'][$place] = max($min_points, $result['points'][$place-1]-1);
$result['sum'] += $this->parameters['type'] * $result['points'][$place];
}
if ($this->parameters['title_sum'] / $this->parameters['players'] >= 2.5) {
$result['points'][1] += 5;
$result['points'][2] += 3;
$result['points'][3] += 1;
$result['sum'] += $this->parameters['type'] * 8;
}
return $result;
}
}
class ApiPklV1 extends ApiPkl {}
class ApiPklV2 extends ApiPklV1 {
function calculate_kmp_points() {
// the line below works only because you can't play > 39 boards in KMP
// please kill me if it ever changes
$this->parameters['tournament_weight'] = 4;
$this->parameters['min_points'] = 0;
$intermediate = $this->calculate_points();
$this->parameters['min_points'] = $intermediate['points'][1] + 10;
return $this->calculate_points();
}
}
class ApiPklV3 extends ApiPklV2 {}
?>
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