diff options
Diffstat (limited to 'http/api.php')
| -rw-r--r-- | http/api.php | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/http/api.php b/http/api.php new file mode 100644 index 0000000..bccd5d3 --- /dev/null +++ b/http/api.php @@ -0,0 +1,208 @@ +<?php + +/* +Parametry: + - rodzaj turnieju (4 => teamy, 2 => pary, 1 => ind) + - l. uczestników + - suma WK + - ranga turnieju (0 => K, 1 => Ok, 2 => R, 3 => O, 4 => O*, 5 => O**, 6 => O***, 7 => O****) (opcjonalny, jeśli podano ręczne minPKL i wagę) + - l. rozdań => 40? (opcjonalny, jeśli podano ręczne minPKL i wagę) + - ręczne minPKL za pierwsze (opcjonalny) + - ręczna waga (opcjonalny) + - ręczny współczynnik zawodniczy (opcjonalny) + - ręczne progi (opcjonalne) + + { + "type": 2, + "contestants": 20, + "title_sum": 230, + "tournament_rank": 3, + "over39_boards": 0, + "manual": { + "min_points": 50, + "tournament_weight": 50, + "players_coefficient": 0.1, + "points_cutoffs": [[0.1, 0.9], [0.5, 0.0]] + } + } + +*/ + +class ParametersException extends Exception {}; + +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, $flags); + } + return true; +} + +function ensure_parameters($parameters, $params) { + foreach ($params as $param) { + if (!isset($parameters[$param])) { + throw new ParametersException('Missing parameter: ' . $param); + } + if (!is_numeric($parameters[$param])) { + throw new ParametersException('Parameter: ' . $param . ' is not a numeric value (' . $parameters[$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($parameters) { + ensure_parameters($parameters, array('type', 'contestants', 'title_sum')); + check_values($parameters, array( + 'type' => function($r) { return ctype_digit($r) && intval($r) > 0; }, + 'contestants' => function($r) { return ctype_digit($r) && intval($r) > 0; }, + 'title_sum' => function($r) { return floatval($r) >= 0; } + )); + if (isset($parameters['players'])) { + check_values($parameters, array( + 'players' => function($r) { return ctype_digit($r) && intval($r) > 0; } + )); + } + if (!isset($parameters['manual']) || !isset($parameters['manual']['min_points']) || !isset($parameters['manual']['tournament_weight'])) { + ensure_parameters($parameters, array('tournament_rank', 'over39_boards')); + check_values($parameters, array( + 'tournament_rank' => function($r) { return ctype_digit($r) && intval($r) >= 0 && intval($r) <= 7; }, + 'over39_boards' => function($r) { return ctype_digit($r) && intval($r) >= 0 && intval($r) <= 1; } + )); + } else { + check_values($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($parameters['manual']) && isset($parameters['manual']['players_coefficient'])) { + check_values($parameters['manual'], array( + 'players_coefficient' => function($r) { return floatval($r) >= 0; } + )); + } +} + +function parse_parameters($parameters) { + $return = array(); + $return['type'] = intval($parameters['type']); + if ($return['type'] == 3 || $return['type'] > 4) { + throw new ParametersException('Parameter: type has incorrect value (' . $return['type'] . ')'); + } + $return['contestants'] = intval($parameters['contestants']); + $return['players'] = isset($parameters['players']) ? intval($parameters['players']) : intval($parameters['contestants']) * $return['type']; + $return['title_sum'] = floatval($parameters['title_sum']); + $weights = array( + array(1, 2, 4, 5, 7, 10, 15, 25), + array(2, 3, 5, 7, 10, 15, 25, 40) + ); + $return['tournament_weight'] = (isset($parameters['manual']) && isset($parameters['manual']['tournament_weight'])) ? intval($parameters['manual']['tournament_weight']) : $weights[intval($parameters['over39_boards'])][intval($parameters['tournament_rank'])]; + $min_points = array( + array(0, 0, 0, 0, 50, 75, 150, 200), + array(0, 0, 0, 0, 70, 100, 200, 300) + ); + $return['min_points'] = (isset($parameters['manual']) && isset($parameters['manual']['min_points'])) ? intval($parameters['manual']['min_points']) : $min_points[intval($parameters['over39_boards'])][intval($parameters['tournament_rank'])]; + $return['players_coefficient'] = (isset($parameters['manual']) && isset($parameters['manual']['players_coefficient'])) ? floatval($parameters['manual']['players_coefficient']) : 0.05; + $return['points_cutoffs'] = (isset($parameters['manual']) && isset($parameters['manual']['points_cutoffs']) && is_array($parameters['manual']['points_cutoffs'])) ? $parameters['manual']['points_cutoffs'] : array( + array(0.0, 1.0), + array(0.02, 0.9), + array(0.2, 0.2), + array(0.5, 0.0) + ); + recursive_ksort($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: ' . $cutoff[0]); + } + if (($cutoff[1] < 0.0) || ($cutoff[1] > 1.0)) { + throw new ParametersException('Cutoff values need to be between 1.0 and 0.0: ' . $cutoff[1]); + } + } + for ($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) { + $position_percentage = get_position_percentage_from_position($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 $result; + } + } + return 0.0; +} + +function calculate_points($parameters) { + $max_points = safe_ceil(max( + $parameters['min_points'], + (1 + 0.25 * ($parameters['type'] > 2)) * (max(0.15, $parameters['title_sum'] / $parameters['players']) * $parameters['tournament_weight'] + $parameters['players_coefficient'] * $parameters['contestants'] * $parameters['type']) + )); + $min_points = 1; + $result = array("sum" => 0); + for ($place = 1; $place <= $parameters['contestants']; $place++) { + $percentage = get_percentage_from_position($place, $parameters['contestants'], $parameters['points_cutoffs']); + $points = safe_ceil(floatval($max_points) * $percentage); + $result[$place] = max($min_points, intval($points)); + $result['sum'] += $parameters['type'] * $result[$place]; + } + return $result; +} + +function run($parameters) { + try { + check_parameters($parameters); + $parameters = parse_parameters($parameters); + $result = calculate_points($parameters); + return $result; + } + catch (ParametersException $e) { + http_response_code(400); + die($e->getMessage()); + } + catch (Exception $e) { + http_response_code(500); + die($e->getMessage()); + } +} + +/*if ($_SERVER['REQUEST_METHOD'] != 'POST') { + http_response_code(405); + die('API only accepts POST requests'); +} else {*/ + print(json_encode(run($_REQUEST))); +//} + +?> |