<?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)');
// -------



// default whitelist
$whitelist_file = './whitelist.txt';
$whitelist_default = array(
	"BandcampBridge",
	"CryptomeBridge",
	"DansTonChatBridge",
	"DuckDuckGoBridge",
	"FlickrExploreBridge",
	"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));
}

// 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);
                    $bridge
                        ->setCache($cache) // Comment this lign for avoid cache use
                        ->setDatas($_REQUEST);

                    // Data transformation
                    $format = Format::create($format);
                    $format
                        ->setDatas($bridge->getDatas())
                        ->setExtraInfos(array(
                            'name' => $bridge->getName(),
                            'uri' => $bridge->getURI(),
                        ))
                        ->display();
                    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>';
}

$bridges = Bridge::searchInformation();
$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
	    $bridgecount = 0;
	    foreach($bridges as $bridgeReference => $bridgeInformations):

		if(BridgeWhitelist($whitelist_selection, $bridgeReference)):
	?>
        <section id="bridge-<?= $bridgeReference ?>" data-ref="<?= $bridgeReference ?>">
            <h2><?= isset($bridgeInformations['homepage']) ? '<a href="'.$bridgeInformations['homepage'].'">'.$bridgeInformations['name'].'</a>' : $bridgeInformations['name']  ?></h2>
            <p class="description">
                <?= isset($bridgeInformations['description']) ? $bridgeInformations['description'] : 'No description provided' ?>
            </p>

            <?php if( isset($bridgeInformations['use']) && count($bridgeInformations['use']) > 0 ): ?>
	            <ol class="list-use">
	                <?php foreach($bridgeInformations['use'] as $anUseNum => $anUse): ?>
	                <li data-use="<?= $anUseNum ?>">
	                    <form method="GET" action="?">
	                        <input type="hidden" name="action" value="display" />
	                        <input type="hidden" name="bridge" value="<?= $bridgeReference ?>" />
	                        <?php
	                            foreach($anUse as $argName => $argDescription)
	                            {
	                                $idArg = 'arg-' . $bridgeReference . '-' . $anUseNum . '-' . $argName;
	                                echo '<input id="', $idArg, '" type="text" value="" placeholder="', $argDescription, '" name="', $argName, '" />';
	                            }

	                            foreach( $formats as $name => $infos )
	                            {
		                            if ( isset($infos['name']) )
		                            {
			                            echo getHelperButtonFormat($name, $infos['name']);
		                            }
	                            }
		                    ?>
	                    </form>
	                </li>
	                <?php endforeach; ?>
	            </ol>
            <?php else: ?>
	            <form method="GET" action="?">
	                <input type="hidden" name="action" value="display" />
	                <input type="hidden" name="bridge" value="<?= $bridgeReference ?>" />
	                <?php
	                    foreach( $formats as $name => $infos )
	                    {
	                        if( isset($infos['name']) )
	                        {
		                        echo getHelperButtonFormat($name, $infos['name']);
	                        }
	                    }
	                ?>
	            </form>
            <?php endif; ?>
		<?= isset($bridgeInformations['maintainer']) ? '<span class="maintainer">'.$bridgeInformations['maintainer'].'</span>' : '' ?>
        </section>
    <?php
            $bridgecount++;
        endif;
    endforeach;
	?>
    <footer>
		<?= $bridgecount; ?>/<?= count($bridges) ?> active bridges<br>
        <a href="https://github.com/sebsauvage/rss-bridge">RSS-Bridge alpha 0.1 ~ Public Domain</a>
    </footer>  
    </body>
</html>