/*
Cinema.java
Version history:
 - 2002-09-10 - minor changes to formatting and in the toString() method
   -- Philip Heede <c991395@student.dtu.dk>
 - 2001-10-xx - minor updates
   -- Anne Haxthausen <ah@imm.dtu.dk>
 - 2000-10-xx - initial release
   -- Torben Hoffman
- - - -
A simple representation of cinemas.
*/

public class Cinema
{
   private boolean[][] cinema;

   public Cinema(int[] seatsOnRow)
   {
      cinema = new boolean[seatsOnRow.length][];

      for (int i=0; i<seatsOnRow.length; i++)
         cinema[i] = new boolean[seatsOnRow[i]];
   }

   public int rows()
   { return cinema.length; }

   public int seatsOnRow (int row)
   { return cinema[row].length; }

   public int seats()
   {
      int res=0;

      for (int i=0; i<cinema.length; i++)
         res = res + cinema[i].length;

      return res;
   }

   public int rowVacancies(int row)
   {
      int res=0;

      for (int i=0; i<cinema[row].length; i++)
         if (!cinema[row][i])
            res = res +1;

      return res;
   }

   public int vacancies()
   {
      int res = 0;

      for (int i=0; i<cinema.length; i++)
         res = res + this.rowVacancies(i);

      return res;
   }

   public void book(int row, int seat)
   { cinema[row][seat] = true; }

   public void release(int row, int seat)
   { cinema[row][seat] = false; }

   // auxillary functions
   private static String rowToString(boolean[] row)
   {
      String res = "";

      for (int i=0; i<row.length; i++)
      {
         if (row[i])
            res = res + "# ";
         else
            res = res + "O ";
      }
      return res;
   }

   public String toString()
   {
      // create a StringBuffer object to hold our string while building it
      // initial size/capacity is set two times the number of seats plus the
      // number of rows, as this is the size of the final string
      StringBuffer res = new StringBuffer(2*seats() + rows());

      // use the rowToString() auxillary function to generate string
      // for the individual rows of the cinema
      for (int i=0; i < cinema.length; i++)
         res.append(rowToString(cinema[i])).append("\n");

      // return a normal string
      return res.toString();
   }
}