<?php

namespace OCA\Radio\Service;

use Exception;

use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Db\MultipleObjectsReturnedException;

use OCA\Radio\Db\Radio;
use OCA\Radio\Db\RadioMapper;

class RadioService {

	/** @var RadioMapper */
	private $mapper;

	public function __construct(RadioMapper $mapper) {
		$this->mapper = $mapper;
	}

	public function findAll(string $userId): array {
		return $this->mapper->findAll($userId);
	}

	private function handleException(Exception $e): void {
		if ($e instanceof DoesNotExistException ||
			$e instanceof MultipleObjectsReturnedException) {
			throw new RadioNotFound($e->getMessage());
		} else {
			throw $e;
		}
	}

	public function find($id, $userId) {
		try {
			return $this->mapper->find($id, $userId);

			// in order to be able to plug in different storage backends like files
		// for instance it is a good idea to turn storage related exceptions
		// into service related exceptions so controllers and service users
		// have to deal with only one type of exception
		} catch (Exception $e) {
			$this->handleException($e);
		}
	}

	public function create($station, $userId) {
		$radio = new Radio();
		$radio->setStation($station);
		$radio->setUserId($userId);
		return $this->mapper->insert($radio);
	}

	public function update($id, $station, $userId) {
		try {
			$radio = $this->mapper->find($id, $userId);
			$radio->setStation($station);
			return $this->mapper->update($radio);
		} catch (Exception $e) {
			$this->handleException($e);
		}
	}

	public function delete($id, $userId) {
		try {
			$radio = $this->mapper->find($id, $userId);
			$this->mapper->delete($radio);
			return $radio;
		} catch (Exception $e) {
			$this->handleException($e);
		}
	}
}