<?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;
	private $champ_id_element_lie;
	
	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';
			$this->champ_id_element_lie = 'id_obs';
		} else {
			$this->table_liaison = 'cel_images_tags_path_liaison';
			$this->table_mots_cles = 'cel_images_tags_path';
			$this->champ_id_element_lie = 'id_image';
		}
	}
	
	public function viderTables() {
		$requete = "TRUNCATE ".$this->table_mots_cles." ";
		$vidage = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
		
		$requete = "TRUNCATE ".$this->table_liaison." ";
		$vidage = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
		
		return $vidage;
	}
	
	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') {
		$requete = "SELECT * FROM cel_images_tags_path_liaison ";
		$criteres = array();
		$premier = array_pop($mots_cles);
		$requete .= 'WHERE (tag = '.Cel::db()->proteger($premier).' ';
	
		foreach ($mots_cles as $mot_cle) {
			$requete .= " ".$operateur." id_image IN (SELECT id_image ".
										"FROM cel_images_tags_path_liaison ".
										"WHERE tag = ".Cel::db()->proteger($mot_cle)." ".
										") ";
		}
		$requete .= ")";
		$images = Cel::db()->requeter($requete);
		return $images;
	}
	
	private function construireRequeteChemin($mots_cles, $operateur = 'AND') {
		$requete = "SELECT * FROM cel_images_tags_path_liaison ";
		$criteres = array();
		$premier = array_pop($mots_cles);
		$requete .= 'WHERE (chemin LIKE '.Cel::db()->proteger('%/'.$premier.'/%').' ';
		
		foreach ($mots_cles as $mot_cle) {
			$requete .= " ".$operateur." id_image IN (SELECT id_image ".
												"FROM cel_images_tags_path_liaison ".
												"WHERE chemin LIKE ".Cel::db()->proteger('%/'.$mot_cle.'/%')." ".
												") ";
		}
		$requete .= ")";
		$images = Cel::db()->requeter($requete);
		return $images;
	}
	
	private function obtenirMotsClesOriginaux($mode) {
		
		if($mode == 'obs') {
			$requete_arbre = "SELECT id_mot_cle_obs as id_mot_cle, ce_mot_cle_obs_parent as parent, id_utilisateur, mot_cle ".
							"FROM cel_mots_cles_obs_srv ORDER BY id_utilisateur, niveau";
		} else {
			$requete_arbre = "SELECT id_mot_cle_image as id_mot_cle, ce_mot_cle_image_parent as parent, id_utilisateur, mot_cle ".
							"FROM cel_mots_cles_images_srv ORDER BY id_utilisateur, niveau";
		}
			
		$mots_cles = Cel::db()->requeter($requete_arbre);
		
		$mots_cles_hierarchiques = array();
		$correspondances_id_mots_cles_obs = array();
		
		$rien = 0;
		
		foreach($mots_cles as &$mot) {
		
			if(!empty($mot['mot_cle'])) {
				$chemin = '/';
				$cle_parent = $mot['parent'].'-'.$mot['id_utilisateur'];
				if(isset($mots_cles_hierarchiques[$cle_parent])) {
					$chemin = $mots_cles_hierarchiques[$cle_parent]['chemin'];
				}
				$chemin .= self::simplifier($mot['mot_cle']).'/';
				$chemin = str_replace("//", "/", $chemin);
					
				$cle = $mot['id_mot_cle'].'-'.$mot['id_utilisateur'];
					
				$mots_cles_hierarchiques[$cle] = array(
								'id_utilisateur' => $mot['id_utilisateur'],
								'chemin' => $chemin,
								'tag' => $mot['mot_cle']
				);
			}
		}
		
		return $mots_cles_hierarchiques;
	}
	
	private function obtenirLiaisonsMotsClesOriginaux($mode) {
		if($mode == 'obs') {				
			$requete_liaisons = "SELECT comc.id_observation as id_element_lie, comc.id_mot_cle_obs as id_mot_cle, id_utilisateur as id_utilisateur ".
														"FROM cel_obs_mots_cles_srv comc ";
														//"INNER JOIN cel_obs o ON o.id_observation = comc.id_observation ";
		} else {		
			$requete_liaisons = "SELECT comc.id_image as id_element_lie, comc.id_mot_cle_image as id_mot_cle, id_utilisateur as id_utilisateur ".
																	"FROM cel_images_mots_cles_srv comc ";
																	//"INNER JOIN cel_images o ON o.id_image = comc.id_image ";
		}
			
		$liaisons = Cel::db()->requeter($requete_liaisons);
		return $liaisons;
	}
	
	public function convertirNestedSetVersPathEnum() {
		
		$mots_cles_hierarchiques = $this->obtenirMotsClesOriginaux($this->mode);
		$liaisons = $this->obtenirLiaisonsMotsClesOriginaux($this->mode);
		
		/*foreach($mots_cles_hierarchiques as $mot) {
			echo $mot['chemin'].'<br />';
		}*/
		//echo '<pre>'.print_r($liaisons,true).'</pre>';
		//exit;
		
		$time_start = microtime();
					
		$mots_cles_slice = array_chunk($mots_cles_hierarchiques, 800, true);
		foreach($mots_cles_slice as $mots_cles_tranche) {
			$requete_insertion_mots_cles = "INSERT INTO ".$this->table_mots_cles." (chemin, id_utilisateur, tag) ".
			                     			" VALUES ";
			
			foreach($mots_cles_tranche as $cle => $mot_cle_tranche) {
				$requete_insertion_mots_cles .= "(".
					cel::db()->proteger($mot_cle_tranche['chemin']).", ".
					cel::db()->proteger($mot_cle_tranche['id_utilisateur']).", ".
					cel::db()->proteger($mot_cle_tranche['tag'])." ".	
				"), ";
			}
			
			$requete_insertion_mots_cles = rtrim($requete_insertion_mots_cles, ", ");
			cel::db()->executer($requete_insertion_mots_cles);
		}
		
		$gne = 0;
		$liaisons_slice = array_chunk($liaisons, 800, true);
		foreach($liaisons_slice as &$liaison_tranche) {
			$requete_insertion_liaisons = "INSERT INTO ".$this->table_liaison." (".$this->champ_id_element_lie.", chemin, tag, id_utilisateur) ".
									      " VALUES ";
			$lier = false;
			
			foreach($liaison_tranche as &$liaison_obs_mot_cle) {
				$cle = $liaison_obs_mot_cle['id_mot_cle'].'-'.$liaison_obs_mot_cle['id_utilisateur'];
				if(isset($mots_cles_hierarchiques[$cle])) {
					$requete_insertion_liaisons .= "(".
						cel::db()->proteger($liaison_obs_mot_cle['id_element_lie']).", ".
						cel::db()->proteger($mots_cles_hierarchiques[$cle]['chemin']).", ".
						cel::db()->proteger($mots_cles_hierarchiques[$cle]['tag']).", ".
						cel::db()->proteger($liaison_obs_mot_cle['id_utilisateur'])." ".
					"), ";
					$lier = true;
				}
			}
			
			if($lier) {
				$requete_insertion_liaisons = rtrim($requete_insertion_liaisons, ", ");
				cel::db()->executer($requete_insertion_liaisons);
			}
		}
		
		$time = microtime() - $time_start;
		echo "La génération d'un tableau de ".count($mots_cles_hierarchiques).' éléments et de '.count($liaisons).' liaisons a pris '.$time.' secondes';
		exit;
	}
	
	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);
		
		$requete = "INSERT INTO ".$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." ".
		                       "WHERE 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($id_utilisateur).", ".
						Cel::db()->proteger($tag).", ".
		           ")";
		
		$insertion = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
		
		return $insertion;
	}
	
	public function lierParId($id_mot_cle, $id_observation, $id_utilisateur) {
		
		$sous_requete_chemin = "(SELECT chemin FROM ".$this->table_mots_cles." ".
				   		"WHERE id_tag = ".Cel::db()->proteger($id_mot_cle).") ";
		
		$requete = "INSERT INTO ".$this->table_liaison." (".$this->champ_id_element_lie.", chemin, id_utilisateur) ".
					"VALUES (".
				   		Cel::db()->proteger($id_observation).", ".
				   		$sous_requete_chemin.",".
				   		Cel::db()->proteger($id_utilisateur)." ".
				   	") ".
					"ON DUPLICATE KEY UPDATE ".$this->champ_id_element_lie." = ".$this->champ_id_element_lie." ";
		
		$liaison = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
		
		return $liaison;
	}
	
	public function lierParChemin($chemin, $id_observation, $id_utilisateur) {
				
		$requete = "INSERT INTO ".$this->table_liaison." (id_obs, chemin, id_utilisateur) ".
					"VALUES (".
						Cel::db()->proteger($id_observation).", ".
						Cel::db()->proteger($sous_requete_chemin).", ".
						Cel::db()->proteger($id_utilisateur)." ".
				   	") ".
					"ON DUPLICATE KEY UPDATE ".$this->champ_id_element_lie." = ".$this->champ_id_element_lie." ";
		
		$liaison = Cel::db()->executer($requete.' -- '.__FILE__.':'.__LINE__);
		
		return $liaison;
	}
	
	// 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)." ";   
		echo $requete.'<br />';
		$deplacement = Cel::db()->executer($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;
	}
	
	/*
		CREATE TRIGGER maj_chemin BEFORE UPDATE
		ON cel_obs_tag_path FOR EACH ROW 
		BEGIN
			UPDATE cel_obs_tag_path_liaison
			SET cel_obs_tag_path_liaison.chemin = NEW.CHEMIN
			WHERE cel_obs_tag_path_liaison.chemin LIKE CONCAT(OLD.chemin,'%')
			AND cel_obs_tag_path_liaison.id_utilisateur = OLD.id_utilisateur
		END;
		
		CREATE TRIGGER suppr_chemin BEFORE UPDATE
		ON cel_obs_tag_path FOR EACH ROW 
		BEGIN
			DELETE FROM cel_obs_tag_path_liaison
			WHERE cel_obs_tag_path_liaison.chemin LIKE CONCAT(OLD.chemin,'%')
			AND cel_obs_tag_path_liaison.id_utilisateur = OLD.id_utilisateur
		END;
		
		CREATE TRIGGER suppr_obs BEFORE DELETE
		ON cel_obs FOR EACH ROW 
		BEGIN
			DELETE FROM cel_obs_tag_path_liaison
			WHERE cel_obs_tag_path_liaison.id_obs = OLD.id_observation
		END;
	*/
	
	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;
	}
}

?>