<?php

Lib::loadClass('Request');
Lib::loadClass('DBG');

/**
 * @example: Response::sendJson($data);
 * @example: Response::sendPlainText($data);
 * @example: Response::sendJsonExit($data);
 * @example: Response::sendPlainTextExit($data);
 * @example: Response::sendTryCatchJson(array($this, 'methodNameReponseCallback'), $args);
 * @example: Response::sendTryCatchJson(array($this, 'methodNameReponseCallback'), $args = 'JSON_FROM_REQUEST_BODY');// try to read json from request body
 */
class Response {

	public static function correctFilename($filename, $extension = null) {
		if (strlen($extension) && (!preg_match("/\.{$extension}$/i", $filename))) $filename .= ".{$extension}";
		return preg_replace('/[^[:alnum:].-]/', '_', $filename);
	}

	public static function sendJson($data) {
		header("Content-type: application/json");
		echo json_encode($data);
	}

	public static function sendPlainText($data) {
		header("Content-type: text/plain");
		if (!is_scalar($data)) throw new Exception("Wrong data type - only scalar values allowed");
		echo $data;
	}

	public static function sendCsv($data, $filename = null) {
		header("Content-Type: text/csv");
		if (strlen($filename)) header('Content-Disposition: attachment; filename=' . self::correctFilename($filename, 'csv') . ';');
		header("Content-Transfer-Encoding: binary");
		header("Content-Length: ".strlen($data));
		echo $data;
	}


	public static function sendJsonExit($data) {
		self::sendJson($data);
		exit;
	}

	public static function sendPlainTextExit($data) {
		self::sendPlainText($data);
		exit;
	}

	public static function sendCsvExit($data, $fileName = null) {
		self::sendCsvExit($data, $fileName);
		exit;
	}

	public static function sendTryCatchJson($callback, $args = array()) {// @param callback must return $response object to send as json or throw exception
		$response = array();
		try {
			if (!is_callable($callback)) throw new Exception("#1L" . __LINE__ . " Callback is not callable");
			if ('JSON_FROM_REQUEST_BODY' == $args) $args = Request::getRequestJson();
			$response = call_user_func($callback, $args);
		} catch (AlertDangerException $e) {
			Http::sendHeaderByCode(200);
			$response['type'] = 'error';
			$response['msg'] = $e->getMessage();
			$response['code'] = "#" . $e->getCode() . "L" . $e->getLine();
			$response['body'] = $e->getBody();
			DBG::log($e);
			Response::sendJsonExit($response);
		} catch (AlertSuccessException $e) {
			Http::sendHeaderByCode(200);
			$response['type'] = 'success';
			$response['msg'] = $e->getMessage();
			$response['code'] = "#" . $e->getCode() . "L" . $e->getLine();
			$response['body'] = $e->getBody();
			DBG::log($e);
			Response::sendJsonExit($response);
		} catch (AlertInfoException $e) {
			Http::sendHeaderByCode(200);
			$response['type'] = 'info';
			$response['msg'] = $e->getMessage();
			$response['code'] = "#" . $e->getCode() . "L" . $e->getLine();
			$response['body'] = $e->getBody();
			DBG::log($e);
			Response::sendJsonExit($response);
		} catch (AlertWarningException $e) {
			Http::sendHeaderByCode(200);
			$response['type'] = 'warning';
			$response['msg'] = $e->getMessage();
			$response['code'] = "#" . $e->getCode() . "L" . $e->getLine();
			$response['body'] = $e->getBody();
			DBG::log($e);
			Response::sendJsonExit($response);
		} catch (Exception $e) {
			Http::sendHeaderByCode(500);
			$response['type'] = 'error';
			$response['msg'] = $e->getMessage();
			$response['code'] = "#" . $e->getCode() . "L" . $e->getLine();
			DBG::log($e);
			Response::sendJsonExit($response);
		}
		Http::sendHeaderByCode(200);
		Response::sendJsonExit($response);
	}

}