<?

try{
	session_start();
	$httpMethod = HttpInput::ValidateRequestMethod([Enums\HttpMethod::Post]);
	$exceptionRedirectUrl = '/ebook-placeholders/new';

	if(Session::$User === null){
		throw new Exceptions\LoginRequiredException();
	}

	// POSTing a new ebook placeholder.
	if($httpMethod == Enums\HttpMethod::Post){
		if(!Session::$User->Benefits->CanCreateEbookPlaceholders){
			throw new Exceptions\InvalidPermissionsException();
		}

		$ebook = new Ebook();

		$title = HttpInput::Str(POST, 'ebook-title');
		if(isset($title)){
			$ebook->Title = $title;
		}

		$authors = [];
		$authorFields = ['author-name-1', 'author-name-2', 'author-name-3'];
		foreach($authorFields as $authorField){
			$authorName = HttpInput::Str(POST, $authorField);
			if(!isset($authorName)){
				continue;
			}
			$author = new Contributor();
			$author->Name = $authorName;
			$author->UrlName = Formatter::MakeUrlSafe($author->Name);
			$author->MarcRole = Enums\MarcRole::Author;
			$authors[] = $author;
		}
		$ebook->Authors = $authors;

		$translators = [];
		$translatorFields = ['translator-name-1', 'translator-name-2'];
		foreach($translatorFields as $translatorField){
			$translatorName = HttpInput::Str(POST, $translatorField);
			if(!isset($translatorName)){
				continue;
			}
			$translator = new Contributor();
			$translator->Name = $translatorName;
			$translator->UrlName = Formatter::MakeUrlSafe($translator->Name);
			$translator->MarcRole = Enums\MarcRole::Translator;
			$translators[] = $translator;
		}
		$ebook->Translators = $translators;

		$collectionMemberships = [];
		$collectionNameFields = ['collection-name-1', 'collection-name-2', 'collection-name-3'];
		foreach($collectionNameFields as $collectionNameField){
			$collectionName = HttpInput::Str(POST, $collectionNameField);
			if(!isset($collectionName)){
				continue;
			}
			$collectionSequenceNumber = HttpInput::Int(POST, 'sequence-number-' . $collectionNameField);
			$collection = Collection::FromName($collectionName);

			$cm = new CollectionMembership();
			$cm->Collection = $collection;
			$cm->SequenceNumber = $collectionSequenceNumber;
			$collectionMemberships[] = $cm;
		}
		$ebook->CollectionMemberships = $collectionMemberships;

		$ebookPlaceholder = new EbookPlaceholder();
		$ebookPlaceholder->FillFromHttpPost();
		$ebook->EbookPlaceholder = $ebookPlaceholder;

		$ebook->FillIdentifierFromTitleAndContributors();
		try{
			$existingEbook = Ebook::GetByIdentifier($ebook->Identifier);
			throw new Exceptions\DuplicateEbookException($ebook->Identifier);
		}
		catch(Exceptions\EbookNotFoundException){
			// Pass and create the placeholder. There is no existing ebook with this identifier.
		}

		// These properties must be set before calling `Ebook::Create()` to prevent the getters from triggering DB queries or accessing `Ebook::$EbookId` before it is set.
		$ebook->Tags = [];
		$ebook->LocSubjects = [];
		$ebook->Illustrators = [];
		$ebook->Contributors = [];
		$ebook->Create();

		$_SESSION['ebook'] = $ebook;
		$_SESSION['is-ebook-placeholder-created'] = true;

		http_response_code(Enums\HttpCode::SeeOther->value);
		header('Location: /ebook-placeholders/new');
	}
}
catch(Exceptions\LoginRequiredException){
	Template::RedirectToLogin();
}
catch(Exceptions\InvalidPermissionsException | Exceptions\InvalidHttpMethodException | Exceptions\HttpMethodNotAllowedException){
	Template::Emit403();
}
catch(Exceptions\AppException $ex){
	$_SESSION['ebook'] = $ebook;
	$_SESSION['exception'] = $ex;

	http_response_code(Enums\HttpCode::SeeOther->value);
	header('Location: ' . $exceptionRedirectUrl);
}