<?php


namespace database\repo;


use database\core\Repo_i;

class meta extends Repo_i {


	/* (1) Creates a new professor
	*
	* @casLogin<String>					The professor's cas login
	* @firstName<String>				[OPT] The professor's firstName
	* @lastName<String>					[OPT] The professor's lastName
	*
	* @return created<bool>				Whether the professor has been created
	*
	---------------------------------------------------------*/
	public function create_prof(String $casLogin, ?String $firstName, ?String $lastName) : bool{


		/* (1) Create user in meta database
		---------------------------------------------------------*/
		/* (1) Try to insert user */
		$st = $this->pdo->prepare("INSERT INTO
			meta_vhost.casUser(casLogin, firstName, lastName)
			VALUES(:cas_login, :first_name, :last_name)");

		/* (2) Manage statement error */
		if( is_bool($st) )
			return FALSE;

		/* (3) Try to execute */
		$success = $st->execute([
			':cas_login'  => $casLogin,
			':first_name' => $firstName,
			':last_name'  => $lastName
		]);

		/* (4) Dispatch execution error */
		return $success;

	}


	/* (2) Check if a professor exists (by its casLogin)
	*
	* @casLogin<String>					The professor's cas login
	*
	* @return exists<bool>				Whether the professor exists
	*
	---------------------------------------------------------*/
	public function prof_exists(String $casLogin) : bool{

		/* (1) Prepare Statement */
		$st = $this->pdo->prepare("SELECT casLogin
			FROM  meta_vhost.casUser
			WHERE casLogin = :cas_login;");

		/* (2) Statement eror */
		if( is_bool($st) )
			return FALSE;

		/* (3) Bind params and execute */
		$success = $st->execute([ ':cas_login' => $casLogin ]);

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

		/* (7) Return That it exists */
		return is_array( $st->fetch() );

	}


	/* (3) Get available departments for a CAS login
	*
	* @casLogin<String>					The professor's CAS username
	*
	* @return departments<array>		The list of available departments (empty on error)
	*
	---------------------------------------------------------*/
	public function get_prof_departments(String $casLogin) : array{

		/* (1) Prepare Statement */
		$st = $this->pdo->prepare("SELECT d2.iddepartement idDep, d2.label labelDep
			FROM meta_vhost.casUser
			JOIN meta_vhost.linkedDep D ON casUser.casLogin = D.casUser_casLogin
			JOIN meta_vhost.departement d2 ON D.departement_iddepartement = d2.iddepartement
			WHERE casLogin = :cas_login");

		/* (2) Check if statement error */
		if( is_bool($st) )
			return [];

		/* (3) Bind params and execute sstatement */
		$success = $st->execute([ ':cas_login' => $casLogin ]);

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

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

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

		/* (7) Add all possible databases to the department */
        foreach ($fetched as &$dep){
            $st = $this->pdo->prepare("SELECT *
                                                FROM meta_vhost.`databases`
                                                WHERE departement_iddepartement = :idDep
                                                ORDER BY meta_vhost.`databases`.`default` DESC ");
            $st->execute(["idDep" => $dep["idDep"]]);
            $dep["versions"] = $st->fetchAll();
        }

		/* (8) Return data */
		return $fetched;

	}


	/* (4) Deletes a professor
	*
	* @casLogin<String>					The professor's CAS username
	*
	* @return deleted<bool>				Whether the professor have been deleeted successfully
	*
	---------------------------------------------------------*/
	public function delete_prof(String $casLogin) : bool{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare('DELETE FROM meta_vhost.casUser
			WHERE casLogin = :cas_login');

		/* (2) Manage statement error */
		if( is_bool($st) )
			return FALSE;

		/* (3) Try to execute */
		$success = $st->execute([ ':cas_login' => $casLogin ]);

		/* (4) Dispatch execution error */
		return $success;

	}


	/* (5) Check if a link exists
	*
	* @casLogin<String>					The professor's cas login
	* @idDep<int>						The department id
	*
	* @return exists<bool>				Whether the professor exists
	*
	---------------------------------------------------------*/
	public function link_exists(String $casLogin, int $idDep) : bool{

		/* (1) Prepare Statement */
		$st = $this->pdo->prepare("SELECT *
			FROM  meta_vhost.linkedDep
			WHERE departement_iddepartement = :id_dep
			AND   casUser_casLogin          = :cas_login");

		/* (2) Statement eror */
		if( is_bool($st) )
			return FALSE;

		/* (3) Bind params and execute */
		$success = $st->execute([
			':id_dep'    => $idDep,
			':cas_login' => $casLogin
		]);

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

		/* (7) Return That it exists */
		return is_array( $st->fetch() );

	}


	/* (6) Associates a professor to a department
	*
	* @casLogin<String>					The professor's CAS username
	* @idDep<int>						The department id
	*
	* @return linked<bool>				Whether the link have been created
	*
	---------------------------------------------------------*/
	public function link(String $casLogin, int $idDep) : bool{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("INSERT INTO meta_vhost.linkedDep(departement_iddepartement, casUser_casLogin)
			VALUES(:id_dep, :cas_login);");

		/* (2) Manage statement error */
		if( is_bool($st) )
			return FALSE;

		/* (3) Try to execute request */
		$success = $st->execute([
			':id_dep'    => $idDep,
			':cas_login' => $casLogin
		]);

		/* (4) Dispatch execution error */
		return $success;

	}


	/* (7) Remove a department from a professor
	*
	* @casLogin<String>					The professor's CAS username
	* @idDep<int>						The department id
	*
	* @return unlinked<bool>			Whether the link have been removed
	*
	---------------------------------------------------------*/
	public function unlink(String $casLogin, int $idDep) : bool{

		/* (1) Prepare statement */
		$st = $this->pdo->prepare("DELETE FROM meta_vhost.linkedDep
			WHERE departement_iddepartement = :id_dep
			AND   casUser_casLogin          = :cas_login;");

		/* (2) Manage statement error */
		if( is_bool($st) )
			return FALSE;

		/* (3) Try to execute request */
		$success = $st->execute([
			':id_dep'    => $idDep,
			':cas_login' => $casLogin
		]);

		/* (4) Dispatch execution error */
		return $success;

	}

	public function deleteVersion(int $version) : bool{
	    //get version data
	    $st = $this->pdo->prepare("SELECT * FROM meta_vhost.`databases` WHERE iddatabase = :id");
	    $st->execute(["id" => $version]);

	    $versionData = $st->fetch();

	    if( !is_array($versionData) ){
	        return false;
        }

        //delete database
		$versionDatabase = $versionData['dbName'];
        $this->pdo->exec("DROP DATABASE $versionDatabase;");

	    //remove from meta
        $st = $this->pdo->prepare("DELETE FROM meta_vhost.`databases` WHERE iddatabase = :id");
        return $st->execute(["id" => $version]);
    }

    public function createVersion(String $label, String $dbName, int $depId, bool $isDefault = false) : int{

        $st = $this->pdo->prepare("INSERT INTO meta_vhost.`databases`(label, dbName, `default`, departement_iddepartement)
                                            VALUE (:label,:dbName,:default,:depId)");
        $st->execute([
            "label" => $label,
            "dbName" => $dbName,
            "default" => $isDefault? 1 : 0,
            "depId" => $depId
        ]);

        return $this->pdo->lastInsertId();
    }

    public function getVersionById(int $id) : array{
	    $st = $this->pdo->prepare("SELECT * FROM meta_vhost.`databases` WHERE iddatabase = :idVersion");
	    $st->execute(["idVersion" => $id]);

	    $fetched = $st->fetch();

	    return $fetched == false ? [] : $fetched;
    }

    public function getAllVersions(int $idDep) : array {
        $st = $this->pdo->prepare("SELECT * FROM meta_vhost.`databases` WHERE departement_iddepartement = :idDep");
        $st->execute(["idDep" => $idDep]);

        return $st->fetchAll();
    }

    public function updateVersion(int $version, ?String $label, ?bool $default) : bool{
	    $set = "";
	    $execute = [];

	    if($label != null){
	        $set .= "label=:label,";
	        $execute["label"] = $label;
        }

        if($default != null){
            $set .= "default=:default,";
            $execute["default"] = $default?1:0;
        }

        $set = rtrim($set,",");

        $execute["idVersion"] = $version;

	    $st = $this->pdo->prepare("UPDATE meta_vhost.`databases` SET $set WHERE iddatabase=:idVersion");

	    return $st->execute($execute);
    }

    public function createDepartment(String $name) : int{
	    $st = $this->pdo->prepare("INSERT INTO meta_vhost.departement(label) VALUE (:label)");

	    $st->execute(["label" => $name]);

	    return $this->pdo->lastInsertId();
	}
}