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

DBEngine::DBEngine(){
	size = 0;
}

void DBEngine::createTable(string n){
	Relation r(n);
	tables.push_back(r);
	size++;
}

void DBEngine::createTable(string n, vector<Attribute> a){
	Relation r(n, a);
	tables.push_back(r);
	size++;
}
	
void DBEngine::createTable(Relation r){ 
	tables.push_back(r); 
	size++;
}
	
vector<Relation> DBEngine::getRelations(){ 
	return tables; 
}
	
Relation DBEngine::getTableFromName(string n){
	//will return first occurence
	for(int i = 0; i < tables.size(); i++){
		if (tables[i].getTableName() == n){
			return tables[i];
		}
	}
}

void DBEngine::saveToFile(vector<string> cmds){ 
	//writes nothing meaningful
	ofstream file;
	file.open("savefile.db");
	
	for(int i = 0; i < cmds.size(); ++i){
		file << cmds[i] << endl;
	}
	
	file.close();
}

//assumes that all attribute titles are unique
Relation DBEngine::projection(vector<string> input, Relation r){
	
	
//	for(int i = 0; i < input.size(); i++) {
//		it = find(r.getAttributes().begin(), r.getAttributes().end(), input[i])
		
		//if(r[i].getName == input[])
//	}
}
/*
void renameAttribute(vector<Attribute> v, string o, string s){
	for(int i = 0; i < v.size(); ++i){
		if(v[i].getName() == o){
			v[i].setName(s);
		}
	}
}
*/