<?php
/*
* Copyright (c) 2017 @meet-aleksey <https://github.com/meet-aleksey>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
Error('POST request method is expected.');
return;
}
// get request body:
$requestBody = file_get_contents('php://input');
// check type of content:
if (strrpos($_SERVER['HTTP_CONTENT_TYPE'], '/json') !== FALSE || strrpos($_SERVER['CONTENT_TYPE'], '/json') !== FALSE) {
// json:
$query = json_decode($requestBody, true);
} else {
// file:
$query = array('method' => 'upload');
}
if (empty($query['method'])) {
Error('The "method" is required. Value cannot be empty.');
return;
}
require_once 'team.php';
require_once 'match.php';
require_once 'stage.php';
switch (strtolower($query['method'])) {
case 'example':
// return example data:
OutputExampleData();
break;
case 'simulate':
// return results of simulation:
OutputSimulationResult($query['teams']);
break;
case 'upload':
OutputData($requestBody);
break;
default:
Error('Unknown method.');
break;
}
/**
* Gets data from data.csv.
*
* @return void
*/
function OutputExampleData() {
if (($data = file_get_contents('data.csv')) !== FALSE) {
OutputData($data);
}
else {
Error('Cannot open file data.csv. Check the existence of "data.csv" and the permission to read it.');
}
}
/**
* Outputs the specified data.
*
* @param string $data
* CSV data to parse and output.
*
* @return void
*/
function OutputData($data) {
if (empty($data)) {
Error('Data is required.');
return;
}
$skip = TRUE;
$teams = array();
$total = new Team();
$total->Name = 'Total';
$total->Games = $total->Goals = $total->Losses =
$total->Missed = $total->Draw = $total->Wins = 0;
$rows = split("\n", preg_replace('~\R~u', "\n", $data));
foreach ($rows as $row) {
if (empty($row)) {
continue;
}
$row = str_getcsv($row, ';');
if (count($row) < 6) {
Error('Wrong data. Please check the file format.');
return;
}
if ($skip) {
$skip = FALSE;
continue;
}
$team = new Team();
$team->Name = trim($row[0]);
$total->Games += ($team->Games = (int)$row[1]);
$total->Wins += ($team->Wins = (int)$row[2]);
$total->Losses += ($team->Losses = (int)$row[3]);
$total->Draw += ($team->Draw = (int)$row[4]);
$balls = split('-', $row[5]);
$total->Goals += ($team->Goals = (int)trim($balls[0]));
$total->Missed += ($team->Missed = (int)trim($balls[1]));
// add team to list
$teams[] = $team;
}
// add total results
$teams[] = $total;
Output($teams);
}
/**
* Outputs simulations result.
*
* @param array $teams
* List of teams.
*
* @return void
*/
function OutputSimulationResult($teams) {
$result = array();
Play($result, $teams);
Output($result);
}
/**
* Simulates a stage of football matches.
*
* @param Stage[] &$writer
* List of stages for output.
*
* @param array $teams
* List of teams.
*
* @param int $stageNumber
* Stage number. Default: 1.
*
* @return void
*/
function Play(&$writer, $teams, $stageNumber = 1) {
if (!isset($stageNumber)) {
$stageNumber = 1;
}
// create new stage:
$writer[] = $stage = new Stage();
$stage->Matches = array();
// teams count:
$totalTeams = count($teams);
// mix the array:
shuffle($teams);
// losers to remove:
$losers = array();
// simulate
for ($i = 0; $i < $totalTeams; $i += 2) {
$goalsAvg = array(
$teams[$i]['Goals'] / $teams[$i]['Games'],
$teams[$i + 1]['Goals'] / $teams[$i + 1]['Games']
);
$missedAvg = array(
$teams[$i]['Missed'] / $teams[$i]['Games'],
$teams[$i + 1]['Missed'] / $teams[$i + 1]['Games']
);
$stage->Matches[] = $match = new Match();
$match->Teams = array($teams[$i]['Name'], $teams[$i + 1]['Name']);
$match->Results = array(
Poisson(
($goalsAvg[0] / $missedAvg[0]) * ($missedAvg[0] / $goalsAvg[0]) * $goalsAvg[0],
($goalsAvg[1] / $missedAvg[1]) * ($missedAvg[1] / $goalsAvg[1]) * $goalsAvg[1]
),
Poisson(
($goalsAvg[1] / $missedAvg[1]) * ($missedAvg[1] / $goalsAvg[1]) * $goalsAvg[1],
($goalsAvg[0] / $missedAvg[0]) * ($missedAvg[0] / $goalsAvg[0]) * $goalsAvg[0]
)
);
if ($match->Results[0] > $match->Results[1]) {
$losers[] = $teams[$i + 1]['Name'];
}
else if ($match->Results[1] > $match->Results[0]) {
$losers[] = $teams[$i]['Name'];
}
else {
$losers[] = $teams[rand($i, $i + 1)]['Name'];
}
}
// names of all teams to search index by name:
$namesOfAllTeams = array_map(function($itm) { return $itm['Name']; }, $teams);
// remove losers:
foreach ($losers as $teamName) {
if (($index = array_search($teamName, $namesOfAllTeams)) !== FALSE) {
unset($teams[$index]);
}
}
// next stage:
if (count($teams) >= 2) {
Play($writer, $teams, $stageNumber + 1);
}
}
/**
* Calculates factorial.
*
* @param double|integer $number
*
* @return double|integer
*/
function Factorial($number)
{
if ($number < 2) {
return 1;
} else {
return ($number * Factorial($number - 1));
}
}
/**
* Poisson Distribution.
*
* @param mixed $chance
* The probability value.
*
* @param mixed $occurrence
* The number of occurances.
*
* @return double
*/
function Poisson($chance, $occurrence)
{
return round((exp(-$chance) * pow($chance, $occurrence) / Factorial($occurrence)) * 100, 2);
}
/**
* Outputs error message.
*
* @param string $message
* Text of error message.
*
* @return void
*/
function Error($message) {
Output(array('Error' => array('Text' => $message)), 500);
}
/**
* Outputs response.
*
* @param mixed $data
* Data to output.
*
* @param int $status
* The HTTP status code. Default: 200 (OK).
*
* @return void
*/
function Output($data, $status = 200) {
header('Content-Type: application/json');
http_response_code($status);
$result = json_encode($data);
if ($result === FALSE)
{
throw new ErrorException('JSON encode error #' . json_last_error() . ': ' . json_last_error_msg());
}
echo $result;
}
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