package Main;

import java.util.ArrayList;

public class projBCNF {


    public projBCNF(){
        //Do nothing atm
    }

    /**
     * This function will only check if all of the attributes in the
     * relation exists in the projection
     * @param X Should contain what you want to project off
     * @param FD Contains all the Function dependencies
     * @return A ArrayList containing objects Relation which succeeded
     */
    public ArrayList<Relation> calcProj(ArrayList<String> X, ArrayList<Relation> FD){
        ArrayList<Relation> okey = new ArrayList<Relation>();
        //Loop over all of the FD
        for(int r = 0; r < FD.size();r++){
            //and check each one of them all only contains what X is
            if(X.containsAll(FD.get(r).getVl()) && X.containsAll(FD.get(r).getHl())){
                //This one was okey to lets add it the new new array to return
                okey.add(FD.get(r));
            }
        }
        return okey;
    }
    public static void main(String[] args){
        ArrayList<Relation> FD = new ArrayList<Relation>();
        ArrayList<String> proj = new ArrayList<String>();

        //Add some stuff to the relation
        ArrayList<String> v1 = new ArrayList<String>();
            v1.add("B");
            v1.add("C");
        ArrayList<String> h1 =  new ArrayList<String>();
            h1.add("D");
        Relation r1 = new Relation(v1,h1);
        FD.add(r1);

        ArrayList<String> v2 = new ArrayList<String>();
            v2.add("D");
        ArrayList<String> h2 = new ArrayList<String>();
            h2.add("A");
        Relation r2 = new Relation(v2,h2);
        FD.add(r2);

        ArrayList<String> v3 = new ArrayList<String>();
            v3.add("A");
        ArrayList<String> h3 = new ArrayList<String>();
            h3.add("B");
        Relation r3 = new Relation(v3,h3);
        FD.add(r3);

        proj.add("A");
        proj.add("D");
        //proj.add("B");
        //proj.add("C");


        projBCNF p = new projBCNF();
        ArrayList<Relation> done = p.calcProj(proj, FD);
        System.out.println(done);




    }
}