<?php
/**
 * Created by PhpStorm.
 * User: lucas
 * Date: 20/02/18
 * Time: 20:30
 */

namespace database\repo;


use database\core\Repo_i;

class ue extends Repo_i {


	/* (1) Create a new UE
	*
	* @code<String>						The code of the UE
	* @label<String>					The UE label (name)
	* @required<bool>					If the UE is required
	* @volumeCours<float>				The UE required volume of COURSES
	* @volumeTD<float>					The UE required volume of TD
	* @volumeTP<float>					The UE required volume of TP
	* @disabled<bool>					[OPT] If it is disabled
	* @defaultFormation<int>			[OPT] If there is a foreign key for a default formation (if only one formation)
	*
	* @return created_code<String>		Code of the created UE (NULL on error)
	*
	---------------------------------------------------------*/
	public function create(string $code, string $label, bool $required, float $volumeCours, float $volumeTD, float $volumeTP, bool $disabled = false, ?int $defaultFormation = null) : ?string {

		/* (1) Prepare request */
		$st = $this->pdo->prepare("INSERT INTO UE(`code`, `label`, `required`, `volumeCours`, `volumeTD`, `volumeTP`, `disabled`, `Formation_idFormation`)
											 VALUE(:code, :label, :required, :volCours, :volTD, :volTP, :disabled, :idFormation) ");

		/* (2) Manage statement error */
		if( $st === false )
			return null;

		/* (3) Bind params and execute request */
		$success = $st->execute([
			':code'        => $code,
			':label'       => $label,
			':required'    => $required ? 1 : 0,
			':volCours'    => $volumeCours,
			':volTD'       => $volumeTD,
			':volTP'       => $volumeTP,
			':disabled'    => $disabled ? 1 : 0,
			':idFormation' => $defaultFormation
		]);

		/* (4) Manage execution error */
		if( !$success )
			return null;

		/* (5) Return insert id */
		return $code;

	}


	/* (2) Updates an UE data
	*
	* @code<String>						The UE code
	* @label<String>					[OPT] The UE's new label
	* @required<bool>					[OPT] Whether the UE is required
	* @volumeCours<float>				[OPT] The UE's new volume of COURSES
	* @volumeTD<float>					[OPT] The UE's new volume of TD
	* @volumeTP<float>					[OPT] The UE's new volume of TP
	* @disabled<bool>					[OPT] Whether the UE is disabled
	* @defaultFormation<int>			[OPT] The default formation foreign key (-1 to unset)
	*
	* @return updated<bool>				Whether the update have been successful
	*
	---------------------------------------------------------*/
	public function update(string $code, ?String $label, ?bool $required, ?float $volumeCours, ?float $volumeTD, ?float $volumeTP, ?bool $disabled, ?int $defaultFormation) : bool{

		/* (1) Build request */
		$build_rq   = [];
		$bind_param = [ ':code' => $code ];

		if( !is_null($label)            ){ $build_rq[] = '`label`                 = :label';            $bind_param[':label']            = $label;            }
		if( !is_null($required)         ){ $build_rq[] = '`required`              = :required';         $bind_param[':required']         = $required?1:0;     }
		if( !is_null($volumeCours)      ){ $build_rq[] = '`volumeCours`           = :volumeCours';      $bind_param[':volumeCours']      = $volumeCours;      }
		if( !is_null($volumeTD)         ){ $build_rq[] = '`volumeTD`              = :volumeTD';         $bind_param[':volumeTD']         = $volumeTD;         }
		if( !is_null($volumeTP)         ){ $build_rq[] = '`volumeTP`              = :volumeTP';         $bind_param[':volumeTP']         = $volumeTP;         }
		if( !is_null($disabled)         ){ $build_rq[] = '`disabled`              = :disabled';         $bind_param[':disabled']         = $disabled?1:0;     }

		// not null @defaultFormation -> set it
		if( !is_null($defaultFormation) ){

			// if @defaultFormation is (-1) -> unset
			if( $defaultFormation < 0 ){ $build_rq[] = '`Formation_idFormation` = NULL';                                                                    }
			// else -> set to new value
			else{                        $build_rq[] = '`Formation_idFormation` = :defaultFormation'; $bind_param[':defaultFormation'] = $defaultFormation; }

		}


		/* (2) ERROR if no updated field */
		if( count($build_rq) <= 0 )
			return FALSE;

		/* (3) Build request */
		$sql_rq = "UPDATE `UE` SET ".implode(', ', $build_rq)." WHERE `code` = :code";

		/* (4) Prepare statement */
		$st = $this->pdo->prepare($sql_rq);

		/* (5) Return execution success */
		return $st->execute($bind_param);

	}


	/* (3) Deletes an UE
	*
	* @code<String>						The UE code
	*
	* @return deleted<bool>				Whether the UE have been deleeted successfully
	*
	---------------------------------------------------------*/
	public function delete(string $code) : bool {

		/* (1) Prepare statement */
		$st = $this->pdo->prepare('DELETE FROM UE WHERE code = :code');

		/* (2) Manage error */
		if( $st === false )
			return false;

		/* (3) Bind params and execute request */
		return $st->execute([ ':code' => $code ]);

	}


	/* (4) Disables an UE
	*
	* @code<String>						The UE code
	*
	* @return disabled<bool>			Whether the UE have been disabled successfully
	*
	---------------------------------------------------------*/
	public function disable(string $code) : bool {
		return $this->update($code, null, null, null, null, null, true, null);
	}


	/* (5) Enables an UE
	*
	* @code<String>						The UE code
	*
	* @return enabled<bool>			Whether the UE have been enabled successfully
	*
	---------------------------------------------------------*/
	public function enable(string $code) : bool {
		return $this->update($code, null, null, null, null, null, false, null);
	}


	/* (6) Gets a UE by its code || getAll
	*
	* @code<String>						[OPT] The UE code, if not set, getAll()
	*
	* @return ues<array>			The UEs matching code (NULL on error)
	*
	---------------------------------------------------------*/
	public function get(?String $code=null) : array{

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

		/* (2) Prepare Statement */
		$this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
		$st = $this->pdo->prepare("SELECT
				ue.code,
				ue.label,
				ue.disabled,
				ue.required,
				ue.volumeCours,
				ue.volumeTD,
				ue.volumeTP,
				IFNULL(ue.Formation_idFormation, -1) idForm,
				f.labelFormation labelForm,
				IFNULL(CONCAT('[', GROUP_CONCAT(fc.idForm, ',', ftd.idForm, ',', ftp.idForm), ']'), '[]') formations
			FROM `UE` ue
			LEFT JOIN Formation f ON ue.Formation_idFormation = f.idFormation
			LEFT JOIN ( SELECT DISTINCT gc.Formation_idFormation  idForm, c.UE_code  as code FROM GroupeCours gc, Cours c WHERE gc.Cours_idCours = c.idCours GROUP BY gc.Formation_idFormation ) fc  ON fc.code  = ue.code
			LEFT JOIN ( SELECT DISTINCT gtd.Formation_idFormation idForm, td.UE_code as code FROM GroupeTD gtd,   TD td   WHERE gtd.TD_idTD      = td.idTD   GROUP BY gtd.Formation_idFormation ) ftd ON ftd.code = ue.code
			LEFT JOIN ( SELECT DISTINCT gtp.Formation_idFormation idForm, tp.UE_code as code FROM GroupeTP gtp,   TP tp   WHERE gtp.TP_idTP      = tp.idTP   GROUP BY gtp.Formation_idFormation ) ftp ON ftp.code = ue.code
			$cond
			GROUP BY ue.code
			ORDER BY `ue`.`label` 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;

	}


	/* (7) Gets all professors who teaches a UE by code
	*
	* @code<String>							The UE code
	*
	* @return professors<array>				The professors' UID matching the @code of the UE
	*
	---------------------------------------------------------*/
	public function getProfessors(String $code) : array{

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

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

		/* (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;

	}
}