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<?php
/**
* @package   jrest
* @author    Aurélien Peronnet <aurelien@tela-botania.org>
* @copyright 2010, 2013 Tela-Botanica
* @license   http://www.cecill.info/licences/Licence_CeCILL_V2-fr.txt Licence CECILL
*
* Librairie de liaison d'images et d'observation à des mots clés en utilisant la méthode
* path enumeration
*/

class GestionMotsClesChemin {
        
        private $config;
        private $mode;
        
        private $table_liaison;
        private $table_mots_cles;
        
        //TODO: trigger pour les tables liaisons
        
        public function GestionMotsClesChemin($config, $mode = 'obs') {
                $this->config = $config;
                //TODO: switch suivant mode
                $this->mode = $mode;
                
                if($mode == 'obs') {
                        $this->table_liaison = 'cel_obs_tags_path_liaison';
                        $this->table_mots_cles = 'cel_obs_tags_path';
                } else {
                        $this->table_liaison = 'cel_images_tags_path_liaison';
                        $this->table_mots_cles = 'cel_images_tags_path';
                }
        }
                
        public function construireRequeteOr($mots_cles) {
                return $this->construireRequete($mots_cles, 'OR');
        }
        
        public function construireRequeteCheminOr($mots_cles) {
                return $this->construireRequeteChemin($mots_cles, 'OR');
        }
        
        public function construireRequeteAnd($mots_cles) {
                return $this->construireRequete($mots_cles, 'AND');
        }
        
        public function construireRequeteCheminAnd($mots_cles) {
                return $this->construireRequeteChemin($mots_cles, 'AND');
        }
        
        public function construireRequete($mots_cles, $operateur = 'AND') {
                $criteres = array();
                $premier = array_pop($mots_cles);
                $requete = "SELECT * FROM ".$this->table_liaison." lmc ".
                           "INNER JOIN ".$this->table_mots_cles." mc ".
                           "ON mc.tag = ".Cel::db()->proteger($premier)." AND lmc.id_tag = mc.id_tag ";
                foreach ($mots_cles as $mot_cle) {
                        $requete .= " ".$operateur." id_element_lie IN (SELECT id_element_lie FROM ".$this->table_liaison." lmc ".
                                                        "INNER JOIN ".$this->table_mots_cles." mc ".
                                                "ON mc.tag = ".Cel::db()->proteger($mot_cle)." AND lmc.id_tag = mc.id_tag ".
                                                ") ";
                }

                $images = Cel::db()->requeter($requete);
                return $images;
        }
        
        private function construireRequeteChemin($mots_cles, $operateur = 'AND') {
                        $criteres = array();
                $premier = array_pop($mots_cles);
                $requete = "SELECT * FROM ".$this->table_liaison." lmc ".
                           "INNER JOIN ".$this->table_mots_cles." mc ".
                           "ON mc.chemin LIKE ".Cel::db()->proteger('%'.$premier.'%')." AND lmc.id_tag = mc.id_tag ";
                foreach ($mots_cles as $mot_cle) {
                        $requete .= " ".$operateur." id_element_lie IN (SELECT id_element_lie FROM ".$this->table_liaison." lmc ".
                                                        "INNER JOIN ".$this->table_mots_cles." mc ".
                                                "ON mc.chemin LIKE ".Cel::db()->proteger('%'.$mot_cle.'%')." AND lmc.id_tag = mc.id_tag ".
                                                ") ";
                }
                
                $images = Cel::db()->requeter($requete);
                return $images;
        }
        
        public function obtenirArbre($id_utilisateur, $chemin = "/") {

                $requete = "SELECT * FROM ".$this->table_mots_cles." ".
                "WHERE id_utilisateur = ".Cel::db()->proteger($id_utilisateur)." AND ".
                "chemin LIKE ".Cel::db()->proteger($chemin."%")." ".
                "ORDER BY chemin";
                
                $arbre = Cel::db()->requeter($requete.' -- '.__FILE__.':'.__LINE__);    
                usort($arbre, array('GestionMotsClesChemin', 'comparerProfNoeuds'));
                
                return $arbre;
        }
        
        public function insererParChemin($mot_cle, $chemin_parent, $id_utilisateur) {
                
                $chemin_mot_cle = self::getCheminHarmonise($chemin_parent, $mot_cle);
                
                $requete = "INSERT IGNORE INTO ".$this->table_mots_cles." (chemin, id_utilisateur, tag) ".
                           "VALUES (".
                                        Cel::db()->proteger($chemin_mot_cle).", ".
                                                Cel::db()->proteger($id_utilisateur).", ".
                                                Cel::db()->proteger($mot_cle)." ".
                           ")";

                $insertion = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $insertion;
        }
        
        public function insererParIdParent($mot_cle, $id_parent, $id_utilisateur) {
                
                $mot_cle_simp = self::simplifier($mot_cle);
                
                $sous_requete_chemin = "(SELECT chemin FROM ".$this->table_mots_cles." ctp ".
                                       "WHERE ctp.id_tag = ".Cel::db()->proteger($id_parent).")";
                
                $requete = "INSERT INTO ".$this->table_mots_cles."(chemin, id_utilisateur, tag) ".
                           "VALUES (".
                                                "CONCAT(".$sous_requete_chemin.",".Cel::db()->proteger($mot_cle_simp).",'/'), ".
                                                Cel::db()->proteger($id_utilisateur).", ".
                                                Cel::db()->proteger($mot_cle)." ".
                           ")";
                
                $insertion = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $insertion;
        }
        
        public function lierParId($id_mot_cle, $id_element_lie) {
                                
                $requete = "INSERT INTO ".$this->table_liaison." (id_element_lie, id_tag) ".
                                        "VALUES (".
                                                Cel::db()->proteger($id_element_lie).", ".
                                                Cel::db()->proteger($id_mot_cle)." ".
                                        ") ".
                                        "ON DUPLICATE KEY UPDATE id_element_lie = id_element_lie ";
                
                $liaison = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $liaison;
        }
        
        public function lierParChemin($chemin, $id_element_lie, $id_utilisateur) {

                $sous_requete_chemin = '(SELECT id_tag FROM '.$this->table_mots_cles.' '.
                                                                'WHERE chemin = '.Cel::db()->proteger(self::harmoniserChemin($chemin)).' '.
                                                                'AND id_utilisateur = '.Cel::db()->proteger($id_utilisateur).' '.
                                                                ')';
                
                $requete = "INSERT INTO ".$this->table_liaison." (id_element_lie, id_tag) ".
                                        "VALUES (".
                                                Cel::db()->proteger($id_element_lie).", ".
                                                $sous_requete_chemin." ".
                                        ") ".
                                        "ON DUPLICATE KEY UPDATE id_element_lie = id_element_lie ";
                
                $liaison = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $liaison;
        }
        
        // OK jusqu'ici !
        
        // Déplacer un mot clé et le renommer est une même opération, dans le cas du renommage,
        // seule la fin du chemin change
        public function renommerChemin($ancien_chemin, $nouveau_chemin, $id_utilisateur) {
                
                $ancien_chemin = self::harmoniserChemin($ancien_chemin);
                $nouveau_chemin = self::harmoniserChemin($nouveau_chemin);
                
                $ancien_chemin_p = Cel::db()->proteger($ancien_chemin);
                $nouveau_chemin_p = Cel::db()->proteger($nouveau_chemin);
                
                // TODO : triggers pour les tables liées ?
                $requete = "UPDATE ".$this->table_mots_cles." ".
                           "SET chemin = REPLACE(chemin,".$ancien_chemin_p.", ".$nouveau_chemin_p.") ".                              
                                   "WHERE chemin LIKE ".Cel::db()->proteger($ancien_chemin."%")." AND ".
                           "id_utilisateur = ".Cel::db()->proteger($id_utilisateur)." ";   
                
                $deplacement = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $deplacement;
        }
        
        public function supprimerChemin($chemin, $id_utilisateur) {
                // TODO : triggers pour les tables liées ?
                $requete = "DELETE FROM ".$this->$table_mots_cles." ".
                        "WHERE chemin LIKE ".Cel::db()->proteger($chemin."%")." AND ".
                        "id_utilisateur = ".Cel::db()->proteger($id_utilisateur)." ";   

                $suppression = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
                
                return $suppression;
                        
        }
        
        // Fonctions utilitaires        
        static public function comparerProfNoeuds($a, $b) {
                
                $nb_slashs_a = substr_count($a['chemin'], '/');
                $nb_slashs_b = substr_count($a['chemin'], '/');
                $cmp = 0;
                
                if($nb_slashs_a == $nb_slashs_b) {
                        $cmp = strcmp($a['chemin'], $b['chemin']);
                } else {
                        $cmp = ($a['chemin'] > $b['chemin']) ? +1 : -1;
                }
                
                return $cmp;
        }
        
        static public function getCheminHarmonise($chemin_parent, $mot_cle) {
                return self::harmoniserChemin($chemin_parent.'/'.self::simplifier($mot_cle).'/');
        }
        
        static public function harmoniserChemin($chemin) {
                $chemin = self::startsWith($chemin,'/') ? $chemin : '/'.$chemin;
                $chemin = self::endsWith($chemin,'/') ? $chemin : $chemin.'/';
                return str_replace('//', '/', $chemin);
        }
        
        // fonction de slugification du mot clé
        // http://stackoverflow.com/questions/2955251/php-function-to-make-slug-url-string
        static public function simplifier($text)
        {
                return trim(str_replace(array('\\','/'), '', $text));
                // replace non letter or digits by -
                $text = preg_replace('~[^\\pL\d]+~u', '-', $text);
        
                // trim
                $text = trim($text, '-');
        
                // transliterate
                $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
        
                // lowercase
                $text = strtolower($text);
        
                // remove unwanted characters
                $text = preg_replace('~[^-\w]+~', '', $text);
        
                if (empty($text))
                {
                        return 'n-a';
                }
        
                return $text;
        }
        
        static public function startsWith($haystack, $needle) {
                return $needle === "" || strpos($haystack, $needle) === 0;
        }
        
        static public function endsWith($haystack, $needle) {
                return $needle === "" || substr($haystack, -strlen($needle)) === $needle;
        }
}

?>