#pragma once
#include <fstream>
#include <iostream>
#include <vector>
#include "Relation.h"

//still in progress
class DBEngine{
	vector<Relation> tables;
	vector<string> commands;
	int size;
	
public:
	DBEngine();
	void createTable(string n);
	void createTable(string n, vector<Attribute> a);
	void createTable(Relation r);
	void insertValues(string r, vector <string> v);
	vector<Relation> getRelations();
	//void showTable(Relation r);
	Relation& getTableFromName(string n);
	void saveToFile(vector<string> cmds);
	Relation selection(string attName, string s, Relation r);
	Relation projection(vector<string> input, Relation r);
	Relation product(string s1, Relation r1, Relation r2);
	void deleteRelation(string n);
	void save();
	void save(string n);
	void storeCommands(string s);
	void rename(Relation& r, vector<string> oldnames, vector<string> newnames);
	Relation setUnion(Relation r1, Relation r2);
	Relation setDiff(Relation r1, Relation r2);
	Relation crossProduct(Relation r1, Relation r2);
};