<?php

	namespace database\repo;
	use \database\core\DatabaseDriver;
	use \error\core\Err;
	use \database\core\Repo;
	use \orm\core\Table;
	use \orm\core\Rows;

	class etree extends parentRepo{

		protected static function table_name(){ static $table_name = 'etree'; return $table_name;  }

		/* [1] Fetch all etrees for the given machine_cluster
		*
		* @id_warehouse<int>				UID of the given warehouse
		* @id_machine_cluster<int>			UID of the given machine_cluster
		*
		* @return etrees<Array>				The list of etrees
		* 									FALSE on error
		*
		=========================================================*/
		public static function getForMachineCluster($id_warehouse, $id_machine_cluster){

			/* (1) On récupère le ETREE de la machine
			---------------------------------------------------------*/
			$module = Table::get('module')
				->select('id_module')
				->select('name');

			$etree = Table::get('etree')
				->select('id_etree')
				->select('daemon')
				->join('id_module', $module);

			$merge = Table::get('module_merge')
				->join('id_etree', $etree)
				->whereIdWarehouse($id_warehouse)
				->whereIdMachineCluster($id_machine_cluster);

			return $merge->fetch();

		}


		/* [4] Adds a module to machine cluster of a warehouse
		*
		* @id_warehouse<int>				UID of the given warehouse
		* @id_machine_cluster<int>			UID of the given machine_cluster
		* @id_module						UID of the given module
		*
		* @return status<bool>				TRUE on success
		*
		=========================================================*/
		public static function link($id_warehouse, $id_machine_cluster, $id_module){

			/* (1) Check module
			---------------------------------------------------------*/
			/* (1) Check if module exists (by its id) */
			$module = Table::get('module')
				->select('*')
				->unique()
				->whereId($id_module);

			if( !$module->fetch() )
				return false;

			/* (2) Check if the module is allowed in the warehouse */
			$module_m = Table::get('module_availability')
				->select('*')
				->unique()
				->whereIdWarehouse($id_warehouse)
				->whereIdModule($id_module);

			// if not allowed in the warehouse -> error
			if( !$module->fetch() )
				return false;


			/* (2) Check machine_cluster
			---------------------------------------------------------*/
			/* (1) Check if machine_cluster exists (by its id) */
			$machine_cluster = Table::get('machine_cluster')
				->select('*')
				->unique()
				->whereIdWarehouse($id_warehouse)
				->whereId($id_machine_cluster);

			if( !$machine_cluster->fetch() )
				return false;

			/* (2) Check link does not already exists */
			$exists = Table::get('module_merge')
				->select('*')
				->unique()
				->whereIdWarehouse($id_warehouse)
				->whereIdMachineCluster($id_machine_cluster)
				->whereIdModule($id_module);

			if( !!$exists->fetch() )
				return true; // returns all right (even if nothing done)


			/* (3) Create link
			---------------------------------------------------------*/
			$inserted = Table::get('module_merge')->insert([
				'id_warehouse'       => $id_warehouse,
				'id_module'          => $id_module,
				'id_machine_cluster' => $id_machine_cluster
			]);

			// return TRUE only if PDO insert successful
			return $inserted;

		}


		/* [5] Removes a module from machine cluster of a warehouse
		*
		* @id_warehouse<int>				UID of the given warehouse
		* @id_machine_cluster<int>			UID of the given machine_cluster
		* @id_module						UID of the given module
		*
		* @return status<bool>				TRUE on success
		*
		=========================================================*/
		public static function unlink($id_warehouse, $id_machine_cluster, $id_module){

			/* (1) Check module
			---------------------------------------------------------*/
			/* (1) Check if module exists (by its id) */
			$module = Table::get('module')
				->select('*')
				->unique()
				->whereId($id_module);

			if( !$module->fetch() )
				return false;


			/* (2) Check machine_cluster
			---------------------------------------------------------*/
			/* (1) Check if machine_cluster exists (by its id) */
			$machine_cluster = Table::get('machine_cluster')
				->select('*')
				->unique()
				->whereIdWarehouse($id_warehouse)
				->whereId($id_machine_cluster);

			if( !$machine_cluster->fetch() )
				return false;

			/* (2) Check if link already exists */
			$exists = Table::get('module_merge')
				->select('*')
				->unique()
				->whereIdWarehouse($id_warehouse)
				->whereIdMachineCluster($id_machine_cluster)
				->whereIdModule($id_module);

			if( !$exists->fetch() )
				return false; // returns all right (even if nothing done)


			/* (3) Remove link
			---------------------------------------------------------*/
			$deleted = Table::get('module_merge')
				->whereIdWarehouse($id_warehouse)
				->whereIdModule($id_module)
				->whereIdMachineCluster($id_machine_cluster)
				->delete();

			// return TRUE only if PDO delete successful
			return $deleted;

		}


	}


?>