<?php
class Versions {
	private $parametres = null;
	private $ressources = null;
	private $bdd = null;
	private $projetNom = null;
	private $versionsDispo = array();
	private $versionCourrante = array();

	public function __construct(Parametres $parametres, Ressources $ressources, Bdd $bdd) {
		$this->parametres = $parametres;
		$this->ressources = $ressources;
		$this->bdd = $bdd;
		$this->projetNom = $this->ressources->getProjetNom();
		$this->versionsDispo = $this->chargerVersionsDisponibles();
	}

	private function chargerVersionsDisponibles() {
		$tableMeta = $this->projetNom.'_meta';
		$requete = "SELECT version FROM $tableMeta";
		$resultat = $this->bdd->recupererTous($requete);
		if ($resultat == '') {
			//cas ou la requete comporte des erreurs
			$message = "La requête SQL de versionnage formée comporte une erreur : $requete";
			$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
			throw new Exception($message, $code);
		} elseif ($resultat === false) {
			$message = "Versions introuvables dans la table des méta-données";
			$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;
			throw new Exception($message, $code);
		} else {
			foreach ($resultat as $version) {
				$versionsDispo[] = $version['version'];
			}
		}

		return $versionsDispo;
	}

	public function getVersions() {
		$versions = array();
		$versionDemandee = $this->parametres->get('version.projet');
		if ($versionDemandee == '+') {
			$versions[] = end($this->versionsDispo);
		} else if (is_numeric($versionDemandee)) {
			if (in_array($versionDemandee, $this->versionsDispo)) {
				$versions[] = $versionDemandee;
			}
		} else if ($versionDemandee == '*') {
			$versions = $this->versionsDispo;
		}
		$versions = $this->remplacerPointParUnderscore($versions);
		return $versions;
	}

	private function remplacerPointParUnderscore($versions) {
		if (count($versions) > 0) {
			foreach ($versions as $cle => $valeur) {
				$versions[$cle] = str_replace('.', '_', $valeur);
			}
		}
		return $versions;
	}
}
?>