// Quantity.java
// Name:
// Date:
// Comments


/** class: Quantity
 * represents a Quantity list within the unicalc application
 * that is, a numeric value ("multiplier"),
 * a Numerator (N), a list of Strings (units), and
 * a Denomindator (D), another OpenList of Strings (units) 
 * N or D may be the OpenList.emptyList;
 */
class Quantity
{
  private double m;    // the quantity
  private OpenList N;  // the numerator
  private OpenList D;  // the denominator

  /* Quantity, the constructor
   * inputs: a multiplier, m, a numerator list, N, and
   *         a denominator list, D
   * outputs: the new Quantity object
   */
  public Quantity(double m, OpenList N, OpenList D)
  {
    this.m = m;
    this.N = N;
    this.D = D;
  }

  /* toString yields a String representation - note the { } curly brackets
   * inputs: none
   * outputs: the String
   */
  public String toString()
  {
    return "{ " + this.m + ", " + this.N + ", " + this.D + " }";
  }

  /* main, the starting point for program control in this Quantity class
   * inputs: the usual (not used)
   * outputs: none (void)
   */
  public static void main(String[] args)
  {
    System.out.println("\n");

    OpenList DB = getDB();
    System.out.println("DB is " + DB);
    System.out.println("\n");

    Quantity Q1 = new Quantity( 1.0, OpenList.list("m", "m", "s"), OpenList.list("m","s","s") );
    System.out.println("Q1 is " + Q1);
    System.out.println("\n");
    

    // tests to use -- uncomment once each method is written...
    /*
    System.out.println("simplified, Q1 is " + simplify(Q1));

    Quantity Q2 = new Quantity( 42.0, OpenList.list("kg", "m", "s"), OpenList.list("m","s","s") );

    Quantity QM = multiply(Q1, Q2);
    System.out.println("QM is " + QM);

    Quantity QD12 = divide(Q1, Q2);
    Quantity QD21 = divide(Q2, Q1);
    Quantity QD11 = divide(Q1, Q1);
    System.out.println("QD12 is " + QD12);
    System.out.println("QD21 is " + QD21);
    System.out.println("QD11 is " + QD11);

    System.out.println("conv_unit(\"watt\", DB) is " + conv_unit("watt", DB));
    System.out.println("conv_unit(\"joule\", DB) is " + conv_unit("joule", DB));
    System.out.println("conv_unit(\"meter\", DB) is " + conv_unit("meter", DB));

    System.out.println("norm_unit(\"meter\", DB) is " + norm_unit("meter", DB));
    System.out.println("norm_unit(\"joule\", DB) is " + norm_unit("joule", DB));

    Quantity Q3 = new Quantity( 42.0, OpenList.list("joule", "meter"), OpenList.list("watt") );
    System.out.println("norm(Q3, DB) is " + norm(Q3, DB));
    */

    System.out.println("\n");
    System.out.println("End of the Quantity class main.");

  }


  public static OpenList getDB()
  {
    OpenList DB, EL;
    DB = EL = OpenList.emptyList;

    DB = DB.cons(OpenList.list("watt",
          new Quantity(1.0,
            OpenList.list("joule"),
            OpenList.list("second"))));
    DB = DB.cons(OpenList.list("volt",
          new Quantity(1.0,
            OpenList.list("joule"),
            OpenList.list("coulomb"))));
    DB = DB.cons(OpenList.list("ohm",
          new Quantity(1.0,
            OpenList.list("volt"),
            OpenList.list("ampere"))));
    DB = DB.cons(OpenList.list("joule",
          new Quantity(1.0,
            OpenList.list("kg","meter","meter"),
            OpenList.list("second","second"))));
    DB = DB.cons(OpenList.list("coulomb",
          new Quantity(1.0,
            OpenList.list("ampere","second"),
            EL)));
    DB = DB.cons(OpenList.list("mph",
          new Quantity(1.0,
            OpenList.list("mile"),
            OpenList.list("hour"))));
    DB = DB.cons(OpenList.list("minute",
          new Quantity(60.0,
            OpenList.list("second"),
            EL)));
    DB = DB.cons(OpenList.list("hour",
          new Quantity(60.0,
            OpenList.list("minute"),
            EL)));
    DB = DB.cons(OpenList.list("inch",
          new Quantity(0.0253995,
            OpenList.list("meter"),
            EL)));
    DB = DB.cons(OpenList.list("mile",
          new Quantity(5280.0,
            OpenList.list("foot"),
            EL)));
    DB = DB.cons(OpenList.list("foot",
          new Quantity(12.0,
            OpenList.list("inch"),
            EL)));

    return DB;
  }

}