<?php

Lib::loadClass('ACL');
Lib::loadClass('Api_WfsNs');

class Relations {

	static function isAllowedToCreateRelation($userLogin, $typeName, $primaryKey, $remoteTypeName) {
		if ($userLogin !== User::getLogin()) throw new Exception("Not Implemented - isAllowedToCreateRelation for another user");
		$acl = ACL::getAclByNamespace( Api_WfsNs::toNamespace($typeName) );
		if (!$acl->hasField($remoteTypeName)) throw new Exception("Missing field in given object. Field '{$remoteTypeName}' not exists in '{$typeName}'");
		if (!$acl->canCreateField($remoteTypeName)) throw new HttpException("Forbidden create relations from {$typeName} to {$remoteTypeName} ", 403);
		$item = $acl->getItem($primaryKey);
		if (!$item) throw new HttpException("Object not found {$typeName}.{$primaryKey}", 404);
		if (!$acl->canWriteObjectField($remoteTypeName, $item)) throw new HttpException("Forbidden create relations from {$typeName}.{$primaryKey} to {$remoteTypeName} ", 403);
		return true;
	}

	static function isAllowedToGetRelation($userLogin, $typeName, $primaryKey, $remoteTypeName) {
		if ($userLogin !== User::getLogin()) throw new Exception("Not Implemented - isAllowedToGetRelation for another user");
		$acl = ACL::getAclByNamespace( Api_WfsNs::toNamespace($typeName) );
		if (!$acl->hasField($remoteTypeName)) throw new Exception("Missing field in given object. Field '{$remoteTypeName}' not exists in '{$typeName}'");
		if (!$acl->canReadField($remoteTypeName)) throw new HttpException("Forbidden reading relations from {$typeName} to {$remoteTypeName} ", 403);
		$item = $acl->getItem($primaryKey);
		if (!$item) throw new HttpException("Object not found {$typeName}.{$primaryKey}", 404);
		if (!$acl->canReadObjectField($remoteTypeName, $item)) throw new HttpException("Forbidden reading relations from {$typeName}.{$primaryKey} to {$remoteTypeName} ", 403);
		return true;
	}

	static function isAllowedToDeleteRelation($userLogin, $typeName, $primaryKey, $remoteTypeName) {
		DBG::log("TODO: Relations::isAllowedToDeleteRelation()...");
		return false;
	}

	static function getRelations($typeName, $primaryKey, $remoteTypeName) {
		$namespace = Api_WfsNs::toNamespace($typeName);
		return ACL::fetchRefs($namespace, $primaryKey, $remoteTypeName);
	}

	static function createRelations($typeName, $primaryKey, $remoteTypeName, $listRemotePrimaryKeys) {
		$namespace = Api_WfsNs::toNamespace($typeName);
		$acl = ACL::getAclByNamespace($namespace);
		ACL::addListRef($namespace, $remoteTypeName, $primaryKey, $listRemotePrimaryKeys);
	}

	static function deleteRelations($typeName, $primaryKey, $remoteTypeName, $listRemotePrimaryKeys) {
		$namespace = Api_WfsNs::toNamespace($typeName);
		$acl = ACL::getAclByNamespace($namespace);
		ACL::removeListRef($namespace, $remoteTypeName, $primaryKey, $listRemotePrimaryKeys);
	}

}