<?php
/**
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Thomas Tanghus <thomas@tanghus.net>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

/**
 * Public interface of ownCloud for apps to use.
 * AppFramework\HTTP\JSONResponse class
 */

namespace OCP\AppFramework\Http;

use OCP\AppFramework\Http;

/**
 * A renderer for JSON calls
 * @since 6.0.0
 */
class JSONResponse extends Response {

	/**
	 * response data
	 * @var array|object
	 */
	protected $data;

	/**
	 * constructor of JSONResponse
	 * @param array|object $data the object or array that should be transformed
	 * @param int $statusCode the Http status code, defaults to 200
	 * @since 6.0.0
	 */
	public function __construct($data= [], $statusCode=Http::STATUS_OK) {
		$this->data = $data;
		$this->setStatus($statusCode);
		$this->addHeader('Content-Type', 'application/json; charset=utf-8');
	}

	/**
	 * Returns the rendered json
	 * @return string|null the rendered json
	 * @since 6.0.0
	 * @throws \Exception If data could not get encoded
	 */
	public function render() {
		if ($this->getStatus() === Http::STATUS_NO_CONTENT
			|| $this->getStatus() === Http::STATUS_NOT_MODIFIED
		) {
			$response = null;
		} else {
			$response = \json_encode($this->data, JSON_HEX_TAG);
			if ($response === false) {
				throw new \Exception(\sprintf('Could not json_encode due to invalid ' .
					'non UTF-8 characters in the array: %s', \var_export($this->data, true)));
			}
		}

		return $response;
	}

	/**
	 * Sets values in the data json array
	 * @param array|object $data an array or object which will be transformed
	 *                             to JSON
	 * @return JSONResponse Reference to this object
	 * @since 6.0.0 - return value was added in 7.0.0
	 */
	public function setData($data) {
		$this->data = $data;

		return $this;
	}

	/**
	 * Used to get the set parameters
	 * @return array the data
	 * @since 6.0.0
	 */
	public function getData() {
		return $this->data;
	}
}
