<?php
/*
TODO :
- manage SSL detection because if library isn't loaded, some bridge crash !
- factorize the annotation system
- factorize to adapter : Format, Bridge, Cache (actually code is almost the same)
- implement annotation cache for entrance page
- Cache : I think logic must be change as least to avoid to reconvert object from json in FileCache case.
- add namespace to avoid futur problem ?
- see FIXME mentions in the code
- implement header('X-Cached-Version: '.date(DATE_ATOM, filemtime($cachefile)));
*/

date_default_timezone_set('UTC');
error_reporting(0);
//ini_set('display_errors','1'); error_reporting(E_ALL);  // For debugging only.

// extensions check
if (!extension_loaded('openssl'))
	die('"openssl" extension not loaded. Please check "php.ini"');

// FIXME : beta test UA spoofing, please report any blacklisting by PHP-fopen-unfriendly websites
ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20121202 Firefox/30.0 (rss-bridge/0.1; +https://github.com/sebsauvage/rss-bridge)');
// -------

// cache file purge - delete cache files older than 24 hours
$cacheTimeLimit = time() - 60*60*24 ;
$cachePath = 'cache';
if(file_exists($cachePath)) {
   $cacheIterator = new RecursiveIteratorIterator(
     new RecursiveDirectoryIterator($cachePath),
     RecursiveIteratorIterator::CHILD_FIRST
   );
   foreach ($cacheIterator as $cacheFile) {
      if (in_array($cacheFile->getBasename(), array('.', '..')))
         continue;
      elseif ($cacheFile->isFile()) {
         if( filemtime($cacheFile->getPathname()) < $cacheTimeLimit )
            unlink( $cacheFile->getPathname() );
         }
   }
}

// default whitelist
$whitelist_file = './whitelist.txt';
$whitelist_default = array(
	"BandcampBridge",
	"CryptomeBridge",
	"DansTonChatBridge",
	"DuckDuckGoBridge",
	"FacebookBridge",
	"FlickrExploreBridge",
	"GooglePlusPostBridge",
	"GoogleSearchBridge",
	"IdenticaBridge",
	"InstagramBridge",
	"OpenClassroomsBridge",
	"PinterestBridge",
	"ScmbBridge",
	"TwitterBridge",
	"WikipediaENBridge",
	"WikipediaEOBridge",
	"WikipediaFRBridge",
	"YoutubeBridge");

if (!file_exists($whitelist_file)) {
	$whitelist_selection = $whitelist_default;
	$whitelist_write = implode("\n", $whitelist_default);
	file_put_contents($whitelist_file, $whitelist_write);
}
else {
	$whitelist_selection = explode("\n", file_get_contents($whitelist_file));
	array_pop($whitelist_selection);
}

// whitelist control function
function BridgeWhitelist( $whitelist, $name ) {
	if(in_array("$name", $whitelist) or in_array("$name.php", $whitelist))
		return TRUE;
	else
		return FALSE;
}

try{
    require_once __DIR__ . '/lib/RssBridge.php';

    Bridge::setDir(__DIR__ . '/bridges/');
    Format::setDir(__DIR__ . '/formats/');
    Cache::setDir(__DIR__ . '/caches/');

    if( isset($_REQUEST) && isset($_REQUEST['action']) ){
        switch($_REQUEST['action']){
            case 'display':
                if( isset($_REQUEST['bridge']) ){
                    unset($_REQUEST['action']);
                    $bridge = $_REQUEST['bridge'];
                    unset($_REQUEST['bridge']);
                    $format = $_REQUEST['format'];
                    unset($_REQUEST['format']);

			// whitelist control
			if(!BridgeWhitelist($whitelist_selection, $bridge)) {
				throw new \HttpException('This bridge is not whitelisted', 401);
				die; 
			}

                    $cache = Cache::create('FileCache');

                    // Data retrieval
                    $bridge = Bridge::create($bridge);
                    if(isset($_REQUEST["disable_cache"])) {
                    } else {
                        $bridge->setCache($cache); // just add disable cache to your query to disable caching
                    }
                    $bridge->setDatas($_REQUEST);
					$bridge->loadMetadatas();
                    // Data transformation
                    try {
		                $format = Format::create($format);
		                $format
		                    ->setDatas($bridge->getDatas())
		                    ->setExtraInfos(array(
		                        'name' => $bridge->getName(),
		                        'uri' => $bridge->getURI(),
		                    ))
		                    ->display();
		            } catch(Exception $e) {

						echo "The brige has crashed. You should report this to the bridges maintainer";

		            }
                    die;
                }
                break;
        }
    }
}
catch(HttpException $e){
    header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
    header('Content-Type: text/plain');
    die($e->getMessage());
}
catch(\Exception $e){
    die($e->getMessage());
}

function getHelperButtonFormat($value, $name){
    return '<button type="submit" name="format" value="' . $value . '">' . $name . '</button>';
}

function getHelperButtonsFormat($formats){
	$buttons = '';
		foreach( $formats as $name => $infos )
		{
			if ( isset($infos['name']) )
			{
				$buttons .= getHelperButtonFormat($name, $infos['name']) . PHP_EOL;
			}
		}
	return $buttons;
}

function displayBridgeCard($bridgeName, $formats, $isActive = true)
{


	$bridgeElement = Bridge::create($bridgeName);
	if($bridgeElement == false) {
		return "";
	}
	$bridgeElement->loadMetadatas();

	$name = '<a href="'.$bridgeElement->uri.'">'.$bridgeElement->name.'</a>';
	$description = $bridgeElement->description;

	$card = <<<CARD
	<section id="bridge-{$bridgeName}" data-ref="{$bridgeName}">
		<h2>{$name}</h2>
		<p class="description">
			{$description}
		</p>
CARD;

	// If we don't have any parameter for the bridge, we print a generic form to load it.
	if(count($bridgeElement->parameters) == 0) {

		$card .= '<form method="POST" action="?">
				<input type="hidden" name="action" value="display" />
				<input type="hidden" name="bridge" value="' . $bridgeName . '" />' . PHP_EOL;

		if ($isActive)
		{
			$card .= getHelperButtonsFormat($formats);
		}
		else
		{
			$card .= '<span style="font-weight: bold;">Inactive</span>';
		}
		$card .= '</form>' . PHP_EOL;

	}

	foreach($bridgeElement->parameters as $parameterName => $parameter)
	{
		$card .= '<ol class="list-use">' . PHP_EOL;
		if(!is_numeric($parameterName)) {
			$card .= '<h5>'.$parameterName.'</h5>' . PHP_EOL;
		}
		$card .= '<form method="POST" action="?">
					<input type="hidden" name="action" value="display" />
					<input type="hidden" name="bridge" value="' . $bridgeName . '" />' . PHP_EOL;

		$parameter = json_decode($parameter, true);

		foreach($parameter as $inputEntry) {

			if(!isset($inputEntry['exampleValue'])) $inputEntry['exampleValue'] = "";

			$idArg = 'arg-' . $bridgeName . '-' . $parameterName . '-' . $inputEntry['identifier'];

			$card .= '<label for="' .$idArg. '">' .$inputEntry['name']. ' : </label>' . PHP_EOL;

			if(!isset($inputEntry['type']) || $inputEntry['type'] == 'text') {
				$card .= '<input id="' . $idArg . '" type="text" value="" placeholder="' . $inputEntry['exampleValue'] . '" name="' . $inputEntry['identifier'] . '" /><br />' . PHP_EOL;
			} else if($inputEntry['type'] == 'number') {
				$card .= '<input id="' . $idArg . '" type="number" value="" placeholder="' . $inputEntry['exampleValue'] . '" name="' . $inputEntry['identifier'] . '" /><br />' . PHP_EOL;
			} else if($inputEntry['type'] == 'list') {
				$card .= '<select id="' . $idArg . '" name="' . $inputEntry['name'] . '" >';
				foreach($inputEntry['values'] as $listValues) {

					$card .= "<option value='" . $listValues['value'] . "'>" . $listValues['name'] . "</option>";

				}
				$card .= '</select><br >';
			} else if($inputEntry['type'] == 'checkbox') {

				$card .= '<input id="' . $idArg . '" type="checkbox" name="' . $inputEntry['identifier'] . '" /><br />' . PHP_EOL;

			}

		}
		if ($isActive)
		{
			$card .= getHelperButtonsFormat($formats);
		}
		else
		{
			$card .= '<span style="font-weight: bold;">Inactive</span>';
		}
		$card .= '</form>' . PHP_EOL;

	}

	$card .= '<span class="maintainer">'.$bridgeElement->maintainer.'</span>';
	$card .= '</section>';

	return $card;
}

$formats = Format::searchInformation();

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Rss-bridge" />
    <title>RSS-Bridge</title>
    <link href="css/style.css" rel="stylesheet">
    <!--[if IE]>
        <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
    <![endif]-->
</head>

<body>

    <header>
        <h1>RSS-Bridge</h1>
        <h2>·Reconnecting the Web·</h2>
    </header>
	<?php
	    $activeFoundBridgeCount = 0;
		$showInactive = isset($_REQUEST['show_inactive']) && $_REQUEST['show_inactive'] == 1;
		$inactiveBridges = '';
	    foreach(Bridge::listBridges() as $bridgeName)
	    {
			if(BridgeWhitelist($whitelist_selection, $bridgeName))
			{
				echo displayBridgeCard($bridgeName, $formats);
	            $activeFoundBridgeCount++;
			}
			elseif ($showInactive)
			{
				// inactive bridges
				$inactiveBridges .= displayBridgeCard($bridgeName, $formats, false) . PHP_EOL;
			}
		}
		echo '<hr />' . $inactiveBridges;
	?>
    <footer>
		<?= $activeFoundBridgeCount; ?>/<?= count($whitelist_selection) ?> active bridges (<a href="?show_inactive=1">Show inactive</a>)<br />
        <a href="https://github.com/sebsauvage/rss-bridge">RSS-Bridge alpha 0.2 ~ Public Domain</a>
    </footer>
    </body>
</html>