<?php


class Projets extends RestService {

	
	private $parametres = array();
	private $ressources = array();
	
	private $squeletteDossier = '';
	private $cache;
	
	
	public function __construct() {
		$this->squeletteDossier = dirname(__FILE__).DIRECTORY_SEPARATOR;
	}

	
	public function consulter($ressources, $parametres) {
		$resultat = '';
		$reponseHttp = new ReponseHttp();
		try {
			$this->initialiserRessourcesEtParametres($ressources, $parametres);
			$resultat = $this->traiterRessources();
			$reponseHttp->setResultatService($resultat);
		} catch (Exception $e) {
			$reponseHttp->ajouterErreur($e);
		}
		$reponseHttp->emettreLesEntetes();
		$corps = $reponseHttp->getCorps();
		return $corps;
	}
		
	private function initialiserRessourcesEtParametres($ressources, $parametres) {
		$this->ressources = $ressources;
		$this->parametres = $parametres;
	}
	
	private function traiterRessources() {
		$retour = '';
		if ($this->avoirRessources()) {
			if ($this->avoirRessourceService()) {
				$retour = $this->initialiserService();
			}
		}
		return $retour;
	}
	
	private function avoirRessources() {
		$presenceDeRessources = false;
		if (isset($this->ressources) && count($this->ressources) > 0) {
			$presenceDeRessources = true;
		} else {
			$message = "Accès au service refusé : aucune ressource indiquée.\n"
				. "Veuillez indiquer au moins une source de données à interroger"
				. " et le type d'informations a renvoyer.";
			$code = RestServeur::HTTP_CODE_MAUVAISE_REQUETE;
			throw new Exception($message, $code);
		}
		return $presenceDeRessources;
	}
	
	private function chargerConfiguration($nomParametre) {
		$tableau = array();
		$tableauPartiel = explode(',', Config::get($nomParametre));
		$tableauPartiel = array_map('trim', $tableauPartiel);
		foreach ($tableauPartiel as $champ) {
			if (strpos($champ, '=') === false) {
				$tableau[] = $champ;
			} else {
				list($cle, $val) = explode('=', $champ);
				$clePropre = trim($cle);
				$valeurPropre = trim($val);
				$tableau[$clePropre] = $valeurPropre;
			}
		}
		return $tableau;
	}
	
	public static function chargerConfigurationSource($nomSource) {
		$chemin = Config::get('chemin_configurations')."config_$nomSource.ini";
		Config::charger($chemin);
	}
	
	private function chargerClasse($classe) {
		if (class_exists($classe)) {
			return null;
		}
		
		$cheminBiblio = Config::get('chemin_bibliotheque');
		$chemins = array();
		$chemins[] = $this->squeletteDossier;
		$chemins[] = $this->squeletteDossier.'commun' .DIRECTORY_SEPARATOR;
		$chemins[] = $this->squeletteDossier.'sources'.DIRECTORY_SEPARATOR;
		$chemins[] = $cheminBiblio;
		$chemins[] = $cheminBiblio.'robots'.DIRECTORY_SEPARATOR;
		
		foreach ($chemins as $chemin) {
			$chemin = $chemin.$classe.'.php';
			if (file_exists($chemin)) {
				require_once $chemin;
				break;
			}
		}
	}
	
	private function avoirRessourceService() {
		$presenceRessourceService = false;
		$servicesDispo = $this->chargerConfiguration('services_dispo');
		if (isset($this->ressources[0])) {
			$service = $this->ressources[0];
			if (in_array($service, $servicesDispo)) {
				$presenceRessourceService = true;
			} else {
				$message = "La service demandé '$service' n'est pas disponible !\n"
					. "Les services disponibles sont : ".implode(', ', $servicesDispo);
				$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
				throw new Exception($message, $code);
			}
		} else {
			$message = "Vous n'avez pas indiqué de service !\n"
				. "Les services disponibles sont : ".implode(', ', $servicesDispo);
			$code = RestServeur::HTTP_CODE_MAUVAISE_REQUETE;
			throw new Exception($message, $code);
		}
		return $presenceRessourceService;
	}

	private function initialiserService() {
		$nomService = 'commun';
		$classe = $this->obtenirNomClasseService($nomService);
		$chemins = array();
		$chemins[] = $this->squeletteDossier.'commun'.DIRECTORY_SEPARATOR.'Commun.php';
		
		// php5.3 : Enregistrement en première position des autoload de la méthode gérant les classes des services
		if (phpversion() < 5.3) {
			spl_autoload_register(array($this, 'chargerClasse'));
		} else {
			spl_autoload_register(array($this, 'chargerClasse'), true , true);
		}
	
		$retour = '';
		$service = null;
		foreach ($chemins as $chemin) {
			if (file_exists($chemin)) {
				$service = new $classe($this->getBdd());
				$ressourcesPourService = $this->filtrerRessourcesPourService();
				$this->cache = new CacheMoissonnage($service, $nomService,
					Config::get('cache'));
				$retour = $this->cache->consulter($ressourcesPourService, $this->parametres);
				if (get_class($retour) == 'Exception') {
					throw new Exception($retour->getMessage(), RestServeur::HTTP_CODE_MAUVAISE_REQUETE);
				}
			}
		}
		if (is_null($service)) {
			$message = "Le service demandé '{$nomService}' n'existe pas !";
			$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
			throw new Exception($message, $code);
		}
		return $retour;
	}
	
	private function obtenirNomClasseService($mot) {
		$classeNom = str_replace(' ', '', ucwords(strtolower(str_replace('-', ' ', $mot))));
		return $classeNom;
	}
	
	private function filtrerRessourcesPourService() {
		return $this->ressources;
	}
	
}

?>