import {getMap} from './entities';
/*
 * create Relations array of Entity arrays
 */
export function createRelationsOfEntities(entities,relations){
    const rltnsRry = new Array();
    if(entities.length === 0){
	console.error('relations:createRelationsOfEntities() ntts NOT available');
	return rltnsRry;
    }
    //console.log('relations:createRelationsOfEntities() # ntts: ' + entities.length);

    if(relations.length === 0){
	console.error('relations:createRelationsOfEntities() rltns NOT available');
	return rltnsRry;
    }
    //console.log('relations:createRelationsOfEntities() # rltns: ' + relations.length);

    const entitiesMap = getMap(entities);
    for(let i=0; i<relations.length; i++){
	const relation = relations[i];
	    //get From Entity
	let fromEntity = null;
	if(!entitiesMap.has(relation[1])){
	    console.error('relations:createRelationsOfEntities() From Entity NOT known');
	    return rltnsRry;
	}else{
	    fromEntity = entitiesMap.get(relation[1]);
	}

	//get To Entity
	let toEntity = null;
	if(!entitiesMap.has(relation[2])){
	    console.error('relations:createRelationsOfEntities() To Entity NOT known');
	    return rltnsRry;
	}else{
	    toEntity = entitiesMap.get(relation[2]);
	}
	const rry = [fromEntity, toEntity];
	rltnsRry.push(rry);
	//console.log('relations:createRelationsOfEntities() # rltnsRry: ' + rltnsRry.length);
    }
    //console.log('relations:createRelationsOfEntities() # rltnsRry: ' + rltnsRry.length);
    return rltnsRry;
}