<?php
// declare(encoding='UTF-8');
/**
 * Classe principale de chargement des sous-services de syndication.
 *
 * @category   DEL
 * @package    Services
 * @subpackage Syndication
 * @version    0.1
 * @author     Mathias CHOUET <mathias@tela-botanica.org>
 * @author     Jean-Pascal MILCENT <jpm@tela-botanica.org>
 * @author     Aurelien PERONNET <aurelien@tela-botanica.org>
 * @license    GPL v3 <http://www.gnu.org/licenses/gpl.txt>
 * @license    CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>
 * @copyright  1999-2014 Tela Botanica <accueil@tela-botanica.org>
*/
class Syndication extends RestService {

	private $parametres = array();
	private $ressources = array();
	private $conteneur;
	private $methode = null;
	private $sousServiceNom = null;
	private $cheminCourant = null;

	private $serviceNom = 'syndication';
	private $format = 'atom';
	private $squelette_dossier = null;

	/** Indique si oui (true) ou non (false), on veut utiliser les paramètres bruts. */
	protected $utilisationParametresBruts = true;

	public function __construct() {
		$this->conteneur = new Conteneur();
		$this->cheminCourant = dirname(__FILE__).DS;
		$this->squelette_dossier = dirname(__FILE__).DS.$this->serviceNom.DS.'squelettes'.DS;
		$this->formats_autorises = $this->conteneur->getParametreTableau('syndication.formats');
	}

	public function consulter($ressources, $parametres) {
		$this->methode = 'consulter';
		$this->initialiserRessourcesEtParametres($ressources, $parametres);
		$this->verifierRessourcesEtParametres();
		$this->format = isset($this->parametres['format']) ? $this->parametres['format'] : $this->format;
		return $this->executerService();
	}

	private function initialiserRessourcesEtParametres($ressources, $parametres = array()) {
		$this->ressources = $ressources;
		$this->parametres = $parametres;
	}

	private function verifierRessourcesEtParametres() {
		if (isset($this->parametres['format']) && !in_array($this->parametres['format'], $this->formats_autorises)) {
			$msg = "Vous devez indiquer un format de flux valide.\n".$this->getDoc();
			throw new Exception($msg, RestServeur::HTTP_CODE_ERREUR);
		}
	}

	private function executerService() {
		$reponseHttp = new ReponseHttp();
		try {
			$donnees = $this->traiterRessources();
			$resultat = $this->creerResultatService($donnees);
			$reponseHttp->setResultatService($resultat);
		} catch (Exception $e) {
			$reponseHttp->ajouterErreur($e);
		}
		$reponseHttp->emettreLesEntetes();
		$corps = $reponseHttp->getCorps();
		return $corps;
	}

	private function traiterRessources() {
		$this->analyserRessources();
		$retour = $this->initialiserService();
		return $retour;
	}

	private function analyserRessources() {
		if ($this->methode == 'consulter' && isset($this->ressources[0])) {
			if (preg_match('/^tags|votes-?-Par-?Tag|tags-?Par-?Protocole$/i', $this->ressources[0])) {
				$this->sousServiceNom = 'tags';
			} else if (preg_match('/^votes|votes-?Par-?Protocole$/i', $this->ressources[0])){
				$this->sousServiceNom = 'votes';
			} else if ($this->ressources[0] == 'commentaires') {
				$this->sousServiceNom = 'commentaires';
			}
		}
		if ($this->sousServiceNom == null) {
			$this->lancerMessageErreurRessource();
		}
	}

	private function lancerMessageErreurRessource() {
		$ressource = $this->sousServiceNom.'/'.implode('/', $this->ressources);
		$message = "La ressource demandée '$ressource' ".
			"n'est pas disponible pour le service {$this->serviceNom} !\n".
			$this->getDoc();
		$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
		throw new Exception($message, $code);
	}

	public function getDoc() {
		$formatsAutorises = implode(', ', $this->formats_autorises);
		return "Les URLs disponibles pour ce service sont :\n".
			" * en GET :\n".
			" - syndication/commentaires\n".
			" - syndication/tags\n".
			" - syndication/votes-par-protocole\n".
			" Paramètres : \n".
			"  - format : $formatsAutorises";
	}

	private function initialiserService() {
		$classe = $this->obtenirNomClasseService();
		$chemins = array();
		$chemins[] = $this->cheminCourant.$this->serviceNom.DS.$classe.'.php';
		$chemins[] = $this->cheminCourant.'commun'.DS.$classe.'.php';
		$retour = '';
		$service = null;

		foreach ($chemins as $chemin) {
			if (file_exists($chemin)) {
				require_once $chemin;
				$service = new $classe($this->conteneur);
				if ($this->methode == 'consulter') {
					$retour = $service->consulter();
				} else {
					$message = "Le sous-service '{$this->sousServiceNom}' du service '{$this->serviceNom}' ".
						"ne possède pas de méthode '{$this->methode}' !";
					$code = RestServeur::HTTP_NON_IMPLEMENTE;
					throw new Exception($message, $code);
				}
			}
		}

		if (is_null($service)) {
			$ressource = $this->serviceNom.'/'.implode('/', $this->ressources);
			$message = "Le classe '$classe' correspondant à la ressource '$ressource' ".
				"est introuvable par le service '{$this->serviceNom}' !\n".
				$this->getDoc();
			$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
			throw new Exception($message, $code);
		}
		return $retour;
	}

	private function obtenirNomClasseService() {
		return str_replace(' ', '', ucwords(strtolower(str_replace('-', ' ', $this->sousServiceNom))));
	}

	private function creerResultatService($donnees) {
		$resultat = new ResultatService();
		$resultat->mime = $this->getTypeMime();
		$resultat->corps = SquelettePhp::analyser($this->squelette_dossier.$this->format.'.tpl.xml', $donnees);
		return $resultat;
	}

	private function getTypeMime() {
		$mime = '';
		switch ($this->format) {
			case 'atom' :
				$mime = 'application/atom+xml';
				break;
			case 'rss1' :
			case 'rss2' :
				$mime = 'application/rss+xml';
				break;
			case 'opml' :
				$mime = 'text/x-opml';
				break;
			default:
				$mime = 'text/html';
		}
		return $mime;
	}
}