<?php
/*
** Copyright (C) 2001-2024 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/


abstract class CControllerResponse {

	protected $location = '';

	protected $messages = [];

	public function getLocation(): string {
		return $this->location;
	}

	public function redirect(): void {
		// Redirect as simple request.
		if ($this instanceof CControllerResponseRedirect) {
			if ($this->getFormData() === null && CMessageHelper::getTitle() === null) {
				redirect($this->getLocation());
			}

			CMessageHelper::restoreScheduleMessages();
		}

		(new CHtmlPageHeader(_('Loading...'), CWebUser::getLang()))->show();

		echo '<body>';

		echo $this
			->getForm()
			->toString();

		echo $this
			->getScript()
			->toString();

		echo '</body></html>';
		session_write_close();
		exit();
	}

	protected function getForm(): CForm {
		$form = (new CForm())
				->setAction($this->getLocation())
				->setEnctype('multipart/form-data')
				->setId('form-data');

		$data = $this->getData();
		$data = json_encode($data);
		$sign = CEncryptHelper::sign($data);

		$form->addItem(new CInput('hidden', 'formdata', ''));
		$form->addItem(new CInput('hidden', 'sign', base64_encode($sign)));
		$form->addItem(new CInput('hidden', 'data', base64_encode($data)));

		return $form;
	}

	protected function getScript(): CJsScript {
		$js = '
			<script>
				document.addEventListener("DOMContentLoaded", () => document.getElementById("form-data").submit());
			</script>
		';

		return new CJsScript($js);
	}

	private function getData(): array {
		$data = [];
		$messages['messages'] = CMessageHelper::getMessages();

		if ($this instanceof CControllerResponseRedirect) {
			switch (CMessageHelper::getType()) {
				case CMessageHelper::MESSAGE_TYPE_ERROR:
					$messages[CMessageHelper::MESSAGE_TYPE_ERROR] = CMessageHelper::getTitle();
					break;
				case CMessageHelper::MESSAGE_TYPE_SUCCESS:
					$messages[CMessageHelper::MESSAGE_TYPE_SUCCESS] = CMessageHelper::getTitle();
					break;
			}

			$data = $this->getFormData();
		}

		return ['form' => $data, 'messages' => $messages];
	}
}
