<?php
/**
 * Created by PhpStorm.
 * User: lucas
 * Date: 20/02/18
 * Time: 21:00
 */

namespace database\repo;


use database\core\Repo_i;

class category extends Repo_i{

	public function create(int $id, string $label) : bool{
		//create the category or update the label
		$st = $this->pdo->prepare("INSERT INTO Categorie (idCategorie, labelCategorie) VALUE (:id, :label)");

		return $st->execute([
			"id" => $id,
			"label" => $label
		]);

	}

	public function delete(int $id) :bool{
		$st = $this->pdo->prepare("DELETE FROM Categorie WHERE idCategorie = :id");

		return $st->execute([
			"id" => $id
		]);
	}

	public function getStats(?int $id = null){
		$st = $this->pdo->prepare("SELECT IFNULL(VHCours,0) VHCours, IFNULL(VHTd,0)VHTd, IFNULL(VHTp,0)VHTp, Cat.idCategorie idCat, count(P.idProfesseur) nbrProf, Cat.labelCategorie labelCat
											FROM Categorie Cat
											  LEFT JOIN (SELECT IFNULL(SUM(Cours.volume),0) VHCours, Prof.Categorie_idCategorie idCat
														 FROM Professeur Prof
														   LEFT JOIN Cours ON Prof.idProfesseur = Cours.Professeur_idProfesseur
														   LEFT JOIN UE U ON Cours.UE_code = U.code
														 GROUP BY Prof.Categorie_idCategorie, U.disabled
														 HAVING U.disabled = 0) VHCours ON VHCours.idCat = Cat.idCategorie
											
											  LEFT JOIN (SELECT IFNULL(SUM(TD.volume),0) VHTd , Prof.Categorie_idCategorie idCat
														 FROM Professeur Prof
														   LEFT JOIN TD ON TD.Professeur_idProfesseur = Prof.idProfesseur
														   LEFT JOIN UE U2 ON TD.UE_code = U2.code
														 GROUP BY Prof.Categorie_idCategorie, U2.disabled
														 HAVING U2.disabled = 0) VHTd ON VHTd.idCat = Cat.idCategorie
											
											  LEFT JOIN (SELECT IFNULL(SUM(TP.volume),0) VHTp, Prof.Categorie_idCategorie idCat
														 FROM Professeur Prof
														   LEFT JOIN TP ON TP.Professeur_idProfesseur = Prof.idProfesseur
														   LEFT JOIN UE U3 ON TP.UE_code = U3.code
														 GROUP BY Prof.Categorie_idCategorie, U3.disabled
														 HAVING U3.disabled = 0) VHTp ON VHTp.idCat = Cat.idCategorie
											  LEFT JOIN Professeur P ON Cat.idCategorie = P.Categorie_idCategorie
											  ".($id ? " WHERE Cat.idCategorie = :idCat" : "")."
											GROUP BY Cat.idCategorie;");

		$st->execute($id ? ["idCat" => $id] : []);

		if($id){
			return $st->fetch() ?: [];
		}else{
			return $st->fetchAll();
		}
	}


	/* (4) Gets a category by its UID ||| getAll
	*
	* @cat_id<int>						[OPT] The category UID, if not set, getAll()
	*
	* @return categories<array>			The categories matching id (NULL on error)
	*
	---------------------------------------------------------*/
	public function get(?int $cat_id=null) : ?array{

		/* (1) Manage if no id given */
		$cond = is_null($cat_id) ? '' : ' WHERE `idCategorie` = :id';
		$parm = is_null($cat_id) ? [] : [':id' => $cat_id];

		/* (2) Prepare Statement */
		$st = $this->pdo->prepare("SELECT * FROM `Categorie`$cond ORDER BY `labelCategorie` ASC");

		/* (3) Bind params and execute statement */
		if( is_bool($st) ) return [];
		$success = $st->execute($parm);

		/* (4) Manage error */
		if( !$success )
			return [];

		/* (5) Get data */
		$fetched = $st->fetchAll();

		/* (6) Return [] on no result */
		if( $fetched === false )
			return [];

		/* (7) Return data */
		return $fetched;

	}

}