#!/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;

function SaveFeed($feed, $force, $now = null){
	if($force){
		if($now !== null){
			$feed->Updated = $now;
		}
		$feed->Save();
	}
	else{
		$feed->SaveIfChanged();
	}
}

$longopts = ['webroot:', 'force'];
$options = getopt('', $longopts);
$webRoot = $options['webroot'] ?? WEB_ROOT;
$force = isset($options['force']) ? true : false; // If the arg is present, getopts sets it to false!!!

$allEbooks = [];
$newestEbooks = [];
$subjects = [];
$ebooksBySubject = [];
$ebooksPerNewestEbooksFeed = 30;

if(!is_dir($webRoot . '/feeds/opds/subjects')){
	mkdir($webRoot . '/feeds/opds/subjects');
}

if(!is_dir($webRoot . '/feeds/rss/subjects')){
	mkdir($webRoot . '/feeds/rss/subjects');
}

if(!is_dir($webRoot . '/feeds/atom/subjects')){
	mkdir($webRoot . '/feeds/atom/subjects');
}

// Iterate over all ebooks to build the various feeds
foreach(Library::GetEbooksFromFilesystem($webRoot) as $ebook){
	$allEbooks[$ebook->Updated->format('Y-m-d\TH:i:s\Z') . ' ' . $ebook->Identifier] = $ebook;
	$newestEbooks[$ebook->Created->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->Created->format('Y-m-d\TH:i:s\Z') . ' ' . $ebook->Identifier] = $ebook;
	}
}

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

$now = new DateTime();

// Create OPDS feeds
$opdsRootEntries = [
	new OpdsNavigationEntry(
		'Newest Standard Ebooks',
		'The ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks, most-recently-released first.',
		'/feeds/opds/new-releases',
		$now,
		'http://opds-spec.org/sort/new',
		'acquisition'
		),
	new OpdsNavigationEntry(
		'Standard Ebooks by Subject',
		'Browse Standard Ebooks by subject.',
		'/feeds/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.',
		'/feeds/opds/all',
		$now,
		'http://opds-spec.org/crawlable',
		'acquisition')
];

$opdsRoot = new OpdsNavigationFeed('Standard Ebooks', 'The Standard Ebooks catalog.', '/feeds/opds', $webRoot . '/feeds/opds/index.xml', $opdsRootEntries, null);
SaveFeed($opdsRoot, $force, $now);

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

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

// 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.', '/feeds/opds/all', $webRoot . '/feeds/opds/all.xml', $allEbooks, $opdsRoot, true);
SaveFeed($allFeed, $force, $now);

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

// 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.', '/feeds/rss/new-releases', $webRoot . '/feeds/rss/new-releases.xml', $newestEbooks);
SaveFeed($newestRssFeed, $force);

// Create the 'all' feed
$allRssFeed = new RssFeed('Standard Ebooks - All Ebooks', 'All Standard Ebooks, most-recently-released first.', '/feeds/rss/all',  $webRoot . '/feeds/rss/all.xml', $allEbooks);
SaveFeed($allRssFeed, $force);

// 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($subject) . ',” most-recently-released first.', '/feeds/rss/subjects/' . Formatter::MakeUrlSafe((string)$subject),  $webRoot . '/feeds/rss/subjects/' . Formatter::MakeUrlSafe((string)$subject) . '.xml', $ebooks);
	SaveFeed($subjectRssFeed, $force);
}

// 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.', '/feeds/atom/new-releases', $webRoot . '/feeds/atom/new-releases.xml', $newestEbooks);
SaveFeed($newestAtomFeed, $force, $now);

// Create the 'all' feed
$allAtomFeed = new AtomFeed('Standard Ebooks - All Ebooks', 'All Standard Ebooks, most-recently-released first.', '/feeds/atom/all',  $webRoot . '/feeds/atom/all.xml', $allEbooks);
SaveFeed($allAtomFeed, $force, $now);

// 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($subject) . ',” most-recently-released first.', '/feeds/atom/subjects/' . Formatter::MakeUrlSafe((string)$subject),  $webRoot . '/feeds/atom/subjects/' . Formatter::MakeUrlSafe((string)$subject) . '.xml', $ebooks);
	SaveFeed($subjectAtomFeed, $force, $now);
}
?>