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

use function Safe\krsort;
use function Safe\getopt;
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;

// 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;
	}
}

$now = new DateTime();

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

$opdsRoot = new OpdsNavigationFeed('/opds', 'Standard Ebooks', WEB_ROOT . '/opds/index.xml', $opdsRootEntries, null);
$opdsRoot->Save();

// Create the subjects navigation document
sort($subjects);
$subjectNavigationEntries = [];
foreach($subjects as $subject){
	$summary = number_format(sizeof($ebooksBySubject[$subject])) . ' Standard Ebook';
	if(sizeof($ebooksBySubject[$subject]) != 1){
		$summary .= 's';
	}
	$summary .= ' tagged with “' . strtolower($subject) . ',” most-recently-released first.';

	// We leave the updated timestamp blank, as it will be filled in when we generate the individual feeds
	$subjectNavigationEntries[] = new OpdsNavigationEntry('/opds/subjects/' . Formatter::MakeUrlSafe($subject), 'subsection', 'navigation', $now, $subject, $summary);
}
$subjectsFeed = new OpdsNavigationFeed('/opds/subjects', 'Standard Ebooks by Subject', WEB_ROOT . '/opds/subjects/index.xml', $subjectNavigationEntries, $opdsRoot);
$subjectsFeed->Save();

// Now generate each individual subject feed
foreach($ebooksBySubject as $subject => $ebooks){
	krsort($ebooks);
	$subjectFeed = new OpdsAcquisitionFeed('/opds/subjects/' . Formatter::MakeUrlSafe((string)$subject), (string)$subject, WEB_ROOT . '/opds/subjects/' . Formatter::MakeUrlSafe((string)$subject) . '.xml', $ebooks, $subjectsFeed);
	$subjectFeed->Save();
}

// Create the 'all' feed
krsort($allEbooks);
$allFeed = new OpdsAcquisitionFeed('/opds/all', 'All Standard Ebooks', WEB_ROOT . '/opds/all.xml', $allEbooks, $opdsRoot, true);
$allFeed->Save();

// Create the 'newest' feed
krsort($newestEbooks);
$newestEbooks = array_slice($newestEbooks, 0, $ebooksPerNewestEbooksFeed);
$newestFeed = new OpdsAcquisitionFeed('/opds/new-releases', 'Newest ' . number_format($ebooksPerNewestEbooksFeed) . ' Standard Ebooks', WEB_ROOT . '/opds/new-releases.xml', $newestEbooks, $opdsRoot);
$newestFeed->Save();

// Now create RSS feeds

// Create the 'newest' feed
$newestFeed = new RssFeed('/rss/new-releases', 'Newest ' . number_format($ebooksPerNewestEbooksFeed) . ' Standard Ebooks', WEB_ROOT . '/rss/new-releases.xml', 'A list of the ' . number_format($ebooksPerNewestEbooksFeed) . ' latest Standard Ebooks ebook releases, most-recently-released first.', $newestEbooks);
$newestFeed->Save();
?>