<?php
/**
 * Created by PhpStorm.
 * User: lucas
 * Date: 20/02/18
 * Time: 21:35
 */

namespace database\repo;


use database\core\Repo_i;

class formation extends Repo_i {

	/* (1) Creates a new formation
	*
	* @label<String>					The formation label
	* @isInternal<bool>					Whether the formation is internal
	*
	* @return form_id<int>				The formation UID (or NULL on error)
	*
	---------------------------------------------------------*/
	public function create(string $label, bool $isInternal) : ?int{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("INSERT INTO `Formation` (`labelFormation`, `isInternal`) VALUE (:label, :isInternal);");

		/* (2) Bind params and execute statement */
		if( is_bool($st) ) return NULL;
		$success = $st->execute([
			':label'      => $label,
			':isInternal' => $isInternal ? 1 : 0
		]);

		/* (3) Manage error */
		if( !$success )
			return NULL;

		/* (4) Return inserted ID */
		return $this->pdo->lastInsertId();

	}


	/* (2) Check if a formation exists (by its label)
	*
	* @label<String>					The formation label
	*
	* @return form_id<int>				The formation UID (or NULL on error)
	*
	---------------------------------------------------------*/
	public function exists(string $label) : ?int{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("SELECT `idFormation` FROM `Formation` WHERE `labelFormation` = :label");

		/* (2) Bind params and execute statement */
		if( is_bool($st) ) return NULL;
		$success = $st->execute([ ':label' => $label ]);

		/* (3) Manage error */
		if( !$success )
			return NULL;

		/* (4) Return if we have a result */

		return $st->fetch()['idFormation'] ?: 0;

	}


	/* (3) Deletes a formation
	*
	* @return deleted<bool>				Whether the formation have been deleeted successfully
	*
	---------------------------------------------------------*/
	public function delete(int $id) : bool{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("DELETE FROM `Formation` WHERE `idFormation` = :id");

		/* (2) Bind params and execute request */
		if( is_bool($st) ) return false;

		/* (3) Dispatch the execution status */
		return $st->execute([ ':id' => $id ]);

	}


	/* (4) Gets a formation by its ID || getAll
	*
	* @form_id<int>							[OPT] The formation id, if not set, getAll()
	*
	* @return formations<array>				The formations matching id
	*
	---------------------------------------------------------*/
	public function get(?int $form_id) : array{

		/* (1) Manage if no id given */
		$cond = is_null($form_id) ? '' : 'WHERE Form.idFormation = :form_id';
		$parm = is_null($form_id) ? [] : [ ':form_id' => $form_id ];

		/* (2) Prepare statement */
		$st = $this->pdo->prepare("SELECT IFNULL(VHCours,0) VHCours, IFNULL(VHTd,0) VHTd, IFNULL(VHTp,0) VHTp, (IFNULL(VHCours,0) + IFNULL(VHTd,0) + IFNULL(VHTp,0)) VHTotal, Form.isInternal isInternal, Form.idFormation idForm, Form.labelFormation labelForm
											 FROM Formation Form
											  LEFT JOIN (SELECT IFNULL(SUM(C.volume),0) VHCours, GC.Formation_idFormation idForm FROM GroupeCours GC LEFT JOIN Cours C ON GC.Cours_idCours = C.idCours GROUP BY GC.Formation_idFormation) VHCours ON VHCours.idForm = Form.idFormation
											  LEFT JOIN (SELECT IFNULL(SUM(T.volume),0) VHTd, GTD.Formation_idFormation idForm FROM GroupeTD GTD LEFT JOIN TD T ON GTD.TD_idTD = T.idTD GROUP BY GTD.Formation_idFormation) VHTd ON VHTd.idForm = Form.idFormation
											  LEFT JOIN (SELECT IFNULL(SUM(T2.volume),0) VHTp, GTP.Formation_idFormation idForm FROM GroupeTP GTP LEFT JOIN TP T2 ON GTP.TP_idTP = T2.idTP GROUP BY GTP.Formation_idFormation) VHTp ON VHTp.idForm = Form.idFormation
											  $cond;");

		/* (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;

	}


	/* (5) Gets all professors who teaches a formation by ids (array)
	*
	* @form_id<int>							The formation id
	*
	* @return professors<array>				The professors' UID matching the @form_id formation
	*
	---------------------------------------------------------*/
	public function getProfessors(int $form_id) : array{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("SELECT p.idProfesseur
			FROM Professeur p, Formation f
			WHERE (
				   p.idProfesseur IN ( SELECT p_cr.idProfesseur FROM Professeur p_cr, UE ue, Cours c WHERE c.Professeur_idProfesseur = p_cr.idProfesseur AND c.UE_code = ue.code AND ue.Formation_idFormation = f.idFormation )
				OR p.idProfesseur IN ( SELECT p_td.idProfesseur FROM Professeur p_td, UE ue, TD t WHERE t.Professeur_idProfesseur = p_td.idProfesseur    AND t.UE_code = ue.code AND ue.Formation_idFormation = f.idFormation )
				OR p.idProfesseur IN ( SELECT p_tp.idProfesseur FROM Professeur p_tp, UE ue, TP t WHERE t.Professeur_idProfesseur = p_tp.idProfesseur    AND t.UE_code = ue.code AND ue.Formation_idFormation = f.idFormation )
			)
			AND f.idFormation = :form_id;");

		/* (2) Bind params and execute statement */
		if( is_bool($st) ) return [];
		$success = $st->execute([ ':form_id' => $form_id ]);

		/* (3) Manage error */
		if( !$success )
			return [];

		/* (4) Get data */
		$fetched = $st->fetchAll();

		/* (5) Return [] on no result */
		if( $fetched === false )
			return [];

		/* (6) Return data */
		return $fetched;

	}

}