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

//still in progress
class DBEngine {
	vector<Relation> tables;
	int size;

public:
	DBEngine(){
		size = 0;
	}

	void createTable(string n, vector<Attribute> a) {
		Relation r(n, a);
		tables.push_back(r);
	}
	
	void createTable(Relation r) { tables.push_back(r); }
	vector<Relation> getRelations() { return tables; }
	void showTable(Relation r) { r.display(); }
	
	Relation getTableFromName(string n) {
		//will return first occurence
		for(int i = 0; i < tables.size(); i++) {
			if (tables[i].getTableName() == n) {
				return tables[i];
			}
		}
	}
	
	void saveToFile(vector<string> cmds) { 
		ofstream file;
		file.open("savefile.db");
		
		for(int i = 0; i < cmds.size(); ++i){
			file << cmds[i] << endl;
		}
		
		file.close();
	}
	
	//void insertTuple(Relation r, vector<string> t) { r.addTuple(t); }
	
	//need to add find by name
	/*void deleteTuple(Relation r, int n) { 
		cout << "a";
		r.removeTuple(n); }*/
	
	void selectTuples() {
		// 
	}
	
	void project(Relation r, string n) { r.projectQuery(n); }
	
	/*
	Relation product(string p_name, Relation table_1, Relation table_2) {
		
		vector<Attribute> all_att;
		
		//Insert table 1 attributes
		all_att.insert(all_att.begin(), (table_1.getAttributes()).begin(), (table_1.getAttributes()).end());
		//Insert table 2 attributes
		all_att.insert(all_att.begin(), (table_2.getAttributes()).begin(), (table_2.getAttributes()).end());
		
		Relation temp(p_name, all_att);
		
		vector<string> table1_stuff;
		
		
		return temp;
	}
	*/
	
	bool unionComp(Relation r1, Relation r2) { 
		return ((r1.getSize() == r2.getSize()) && (r1.getDomains() == r2.getDomains()));
	}
};