#!/usr/bin/php
<?
require_once('/standardebooks.org/web/lib/Core.php');

use function Safe\krsort;
use function Safe\getopt;
use function Safe\mkdir;
use function Safe\preg_replace;
use function Safe\sort;

$longopts = ["webroot:", "weburl:"];
$options = getopt("", $longopts);
$webRoot = $options["webroot"] ?? "/standardebooks.org/web";
$webUrl = $options["weburl"] ?? "https://standardebooks.org";

$contentFiles = explode("\n", trim(shell_exec('find ' . escapeshellarg($webRoot . '/www/ebooks/') . ' -name "content.opf" | sort') ?? ''));
$allEbooks = [];
$newestEbooks = [];
$subjects = [];
$ebooksBySubject = [];
$ebooksPerNewestEbooksFeed = 30;

if(!is_dir(WEB_ROOT . '/opds/subjects')){
	mkdir(WEB_ROOT . '/opds/subjects');
}

if(!is_dir(WEB_ROOT . '/rss/subjects')){
	mkdir(WEB_ROOT . '/rss/subjects');
}

if(!is_dir(WEB_ROOT . '/atom/subjects')){
	mkdir(WEB_ROOT . '/atom/subjects');
}

// Iterate over all ebooks to build the various feeds
foreach($contentFiles as $path){
	if($path == '')
		continue;

	$ebookWwwFilesystemPath = '';

	try{
		$ebookWwwFilesystemPath = preg_replace('|/content\.opf|ius', '', $path);

		$ebook = new Ebook($ebookWwwFilesystemPath);

		$allEbooks[$ebook->ModifiedTimestamp->format('Y-m-d\TH:i:s\Z') . ' ' . $ebook->Identifier] = $ebook;
		$newestEbooks[$ebook->Timestamp->format('Y-m-d\TH:i:s\Z') . ' ' . $ebook->Identifier] = $ebook;

		foreach($ebook->Tags as $tag){
			// Add the book's subjects to the main subjects list
			if(!in_array($tag->Name, $subjects)){
				$subjects[] = $tag->Name;
			}

			// Sort this ebook by subject
			$ebooksBySubject[$tag->Name][$ebook->Timestamp->format('Y-m-d\TH:i:s\Z') . ' ' . $ebook->Identifier] = $ebook;
		}
	}
	catch(\Exception $ex){
		print('Failed to generate OPDS entry for `' . $ebookWwwFilesystemPath . '`. Exception: ' . $ex->getMessage());
		continue;
	}
}

krsort($newestEbooks);
$newestEbooks = array_slice($newestEbooks, 0, $ebooksPerNewestEbooksFeed);

$now = new DateTime();

// Create OPDS feeds
$opdsRootEntries = [
	new OpdsNavigationEntry(
		'Newest ' . number_format($ebooksPerNewestEbooksFeed) . ' Standard Ebooks',
		'The ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks, most-recently-released first.',
		'/opds/new-releases',
		$now,
		'http://opds-spec.org/sort/new',
		'acquisition'
		),
	new OpdsNavigationEntry(
		'Standard Ebooks by Subject',
		'Browse Standard Ebooks by subject.',
		'/opds/subjects',
		$now,
		'subsection',
		'navigation'),
	new OpdsNavigationEntry(
		'All Standard Ebooks',
		'All Standard Ebooks, most-recently-updated first. This is a Complete Acquisition Feed as defined in OPDS 1.2 §2.5.',
		'/opds/all',
		$now,
		'http://opds-spec.org/crawlable',
		'acquisition')
];

$opdsRoot = new OpdsNavigationFeed('Standard Ebooks', 'The navigation root for the Standard Ebooks OPDS feed.', '/opds', WEB_ROOT . '/opds/index.xml', $opdsRootEntries, null);
$opdsRoot->SaveIfChanged();

// Create the subjects navigation document
sort($subjects);
$subjectNavigationEntries = [];
foreach($subjects as $subject){
	$subjectNavigationEntries[] = new OpdsNavigationEntry($subject, 'Standard Ebooks tagged with “' . strtolower($subject) . ',” most-recently-released first.', '/opds/subjects/' . Formatter::MakeUrlSafe($subject), $now, 'subsection', 'navigation');
}
$subjectsFeed = new OpdsNavigationFeed('Standard Ebooks by Subject', 'Browse Standard Ebooks by subject.', '/opds/subjects', WEB_ROOT . '/opds/subjects/index.xml', $subjectNavigationEntries, $opdsRoot);
$subjectsFeed->Subtitle = 'Browse Standard Ebooks by subject.';
$subjectsFeed->SaveIfChanged();

// Now generate each individual subject feed
foreach($subjectNavigationEntries as $subjectNavigationEntry){
	krsort($ebooksBySubject[$subjectNavigationEntry->Title]);
	$subjectFeed = new OpdsAcquisitionFeed($subjectNavigationEntry->Title . ' Ebooks', $subjectNavigationEntry->Description, '/opds/subjects/' . Formatter::MakeUrlSafe($subjectNavigationEntry->Title), WEB_ROOT . '/opds/subjects/' . Formatter::MakeUrlSafe($subjectNavigationEntry->Title) . '.xml', $ebooksBySubject[$subjectNavigationEntry->Title], $subjectsFeed);
	$subjectFeed->SaveIfChanged();
}

// Create the 'all' feed
krsort($allEbooks);
$allFeed = new OpdsAcquisitionFeed('All Standard Ebooks', 'All Standard Ebooks, most-recently-updated first. This is a Complete Acquisition Feed as defined in OPDS 1.2 §2.5.', '/opds/all', WEB_ROOT . '/opds/all.xml', $allEbooks, $opdsRoot, true);
$allFeed->SaveIfChanged();

// Create the 'newest' feed
$newestFeed = new OpdsAcquisitionFeed('Newest ' . number_format($ebooksPerNewestEbooksFeed) . ' Standard Ebooks', 'The ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks, most-recently-released first.', '/opds/new-releases', WEB_ROOT . '/opds/new-releases.xml', $newestEbooks, $opdsRoot);
$newestFeed->SaveIfChanged();

// Now create RSS feeds

// Create the 'newest' feed
$newestRssFeed = new RssFeed('Standard Ebooks - Newest Ebooks', 'The ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks, most-recently-released first.', '/rss/new-releases', WEB_ROOT . '/rss/new-releases.xml', $newestEbooks);
$newestRssFeed->SaveIfChanged();

// Create the 'all' feed
$allRssFeed = new RssFeed('Standard Ebooks - All Ebooks', 'All Standard Ebooks, most-recently-released first.', '/rss/all',  WEB_ROOT . '/rss/all.xml', $allEbooks);
$allRssFeed->SaveIfChanged();

// Generate each individual subject feed
foreach($ebooksBySubject as $subject => $ebooks){
	krsort($ebooks);
	$subjectRssFeed = new RssFeed('Standard Ebooks - ' . (string)$subject . ' Ebooks', 'Standard Ebooks tagged with “' . strtolower($subject) . ',” most-recently-released first.', '/rss/subjects/' . Formatter::MakeUrlSafe((string)$subject),  WEB_ROOT . '/rss/subjects/' . Formatter::MakeUrlSafe((string)$subject) . '.xml', $ebooks);
	$subjectRssFeed->SaveIfChanged();
}

// Now create the Atom feeds
// Create the 'newest' feed
$newestAtomFeed = new AtomFeed('Standard Ebooks - Newest Ebooks', 'The ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks, most-recently-released first.', '/atom/new-releases', WEB_ROOT . '/atom/new-releases.xml', $newestEbooks);
$newestAtomFeed->SaveIfChanged();

// Create the 'all' feed
$allAtomFeed = new AtomFeed('Standard Ebooks - All Ebooks', 'All Standard Ebooks, most-recently-released first.', '/atom/all',  WEB_ROOT . '/atom/all.xml', $allEbooks);
$allAtomFeed->SaveIfChanged();

// Generate each individual subject feed
foreach($ebooksBySubject as $subject => $ebooks){
	krsort($ebooks);
	$subjectAtomFeed = new AtomFeed('Standard Ebooks - ' . (string)$subject . ' Ebooks', 'Standard Ebooks tagged with “' . strtolower($subject) . ',” most-recently-released first.', '/atom/subjects/' . Formatter::MakeUrlSafe((string)$subject),  WEB_ROOT . '/atom/subjects/' . Formatter::MakeUrlSafe((string)$subject) . '.xml', $ebooks);
	$subjectAtomFeed->SaveIfChanged();
}

?>