stocks.php

<?php

const WORLD_URL_REGEX = '/(?P<country>[A-Za-z]+)(?P<worldId>\d+)/';
const STOCKS_REGEX = '/(?P<id>\d+)\s+(?P<name>.+?)\s+(?P<value>\d+)/';
const SECOND_REFRESH = 3600;

require_once('Option.php');

function arrayGet($array, $key)
{
    return COption::of(isset($array[$key]) ? $array[$key] : null);
}

function getWorldInfo($worldUrl)
{
    return (preg_match_all(WORLD_URL_REGEX, $worldUrl, $matches, PREG_SET_ORDER, 0) == true ? COption::of([ 'country' => $matches[0]['country'], 'id' => intval($matches[0]['worldId']) ]) : COption::of(null));
}

function validateWorldInfo($worldInfo)
{
    $id = $worldInfo['id'];
    switch($worldInfo['country'])
    {
    case 'de': return (1 <= $id && $id <= 14);
    case 'uk': return (1 <= $id && $id <= 1);
    default: return False;
    }
}

function getUrl($worldInfo)
{
    function getUrlForCountry($country)
    {
        switch($country)
        {
        case 'uk': return 'http://world%d.freewar.com/freewar/';
        case 'de': return 'http://welt%d.freewar.de/freewar/';
        }
    }

    function getUrl_($country, $id)
    {
        return sprintf(getUrlForCountry($country), $id);
    }

    return getUrl_($worldInfo['country'], $worldInfo['id']);
}

function parseStocksFile($content)
{
    preg_match_all(STOCKS_REGEX, $content, $matches, PREG_SET_ORDER, 0);
    $stocks = array();
    foreach($matches as $match)
    {
        $id = intval($match['id']);
        $name = $match['name'];
        $value = intval($match['value']);
        $stocks[$id] = array('name' => $name, 'value' => $value);
    }
    return $stocks;
}


$res = arrayGet($_GET, 'world')->flatMap(getWorldInfo)->filter(validateWorldInfo)->flatMap(function($info)
{
    $file = sprintf('freewar/sotcks_%s%d.json', $info['country'], $info['id']);
    if(!file_exists($file) || time() - filemtime($file) >= SECOND_REFRESH)  // print out old file
    {
        $url = getUrl($info);
        if(($urlContent = @file_get_contents($url . 'list_stocks.php')) != false)
        {
            $stocks = parseStocksFile($urlContent);
            file_put_contents($file, json_encode([ 'status' => 'success', 'data' => $stocks ], JSON_PRETTY_PRINT));
        }
        else
        {
            return COption::of(NULL);
        }
    }
    return COption::of(file_get_contents($file));
})->getOrElse(json_encode([ 'status' => 'error', 'message' => 'an error occured' ], JSON_PRETTY_PRINT));

header('Content-Type: application/json');
echo $res;

?>