//Chapter 9: Programming Exercise 12

import java.io.*;

public class Ch9_PrExercise12
{
    static BufferedReader keyboard = new
           BufferedReader(new InputStreamReader(System.in));

    public static void main(String[] args) throws IOException
    {
          char[][] seatPlan = new char[13][6];
          char resp;

          initiailzeSeatPlan(seatPlan);

          showMenu(seatPlan);

          System.out.println("To reserve a seat enter Y/y(Yes), N/n(No): ");
          resp = keyboard.readLine().charAt(0);
          System.out.println();

          while(resp == 'y' || resp == 'Y')
          {
                assignSeat(seatPlan);
                showMenu(seatPlan);
                System.out.println("Reserve another seat Y/y(Yes), N/n(No): ");
                resp = keyboard.readLine().charAt(0);
                System.out.println();
          }
    }

    public static void initiailzeSeatPlan(char[][] sPlan)
    {
          int i, j;

          for(i = 0; i < sPlan.length; i++)
              for(j = 0; j < sPlan[0].length; j++)
                  sPlan[i][j] = '*';
    }

    public static void showSeatAssignments(char[][] sPlan)
    {
          int i, j;

          System.out.println("        A B C  D E F");

          for(i = 0; i < sPlan.length; i++)
          {
            if( i < 9)
                  System.out.print("Row " + (i+1) + "   ");
            else
                System.out.print("Row " + (i+1) + "  ");

                for(j = 0; j < sPlan[0].length; j++)
                {
                      System.out.print(sPlan[i][j] + " ");
                      if(j == 2)
                          System.out.print(" ");
                }
                System.out.println();
          }

          System.out.println("* -- available seat");
          System.out.println("X -- occupied seat");
          System.out.println();
    }

    public static void assignSeat(char[][] sPlan) throws IOException
    {
          char ticketType;
          char resp;

          System.out.print("Enter ticket type: F/f (first class) "
                 + " E/e (Economy class): ");
          ticketType = keyboard.readLine().charAt(0);
          System.out.println();

          switch(ticketType)
          {
          case 'f':
          case 'F': if(!isFirstClassFull(sPlan))
                                assignFirstClassSeat(sPlan);
                          else
                          {
                                System.out.println("Sorry!!! First Class is Full");
                                System.out.print("Press Y/y to continue: ");
                                resp = keyboard.readLine().charAt(0);
                                System.out.println();
                          }

                          break;
          case 'e':
          case 'E': if(!isNonSmokingEconomicFull(sPlan) ||
                              !isSmokingEconomicFull(sPlan))
                                  assignEconomicSeat(sPlan);
                          else
                        {
                                System.out.println("Sorry!!! Economic Class is Full");
                                System.out.print("Press Y/y to continue: ");
                                resp = keyboard.readLine().charAt(0);
                                System.out.println();
                          }
          }

          showSeatAssignments(sPlan);
    }

    public static void showMenu(char[][] sPlan)
    {
          System.out.println("This program assigns seats for a commercial airplane.");
          System.out.println("The current seat assignments is as follows.");
          showSeatAssignments(sPlan);
          System.out.println("Rows 1 and 2 are for first class passengers");
          System.out.println("Rows 1 through 7 are nonsmoking");
    }

    public static boolean isFirstClassFull(char[][] sPlan)
    {
          int i, j;

          int assignedSeats = 0;

          for(i = 0; i < 2; i++)
              for(j = 0; j < sPlan[0].length; j++)
                    if(sPlan[i][j] == 'X')
                        assignedSeats++;

          return (assignedSeats == 2 * sPlan[0].length);
    }

    public static boolean isNonSmokingEconomicFull(char[][] sPlan)
    {
          int i, j;

          int assignedSeats = 0;

          for(i = 2; i < 7; i++)
                for(j = 0; j < sPlan[0].length; j++)
                      if(sPlan[i][j] == 'X')
                            assignedSeats++;

        return (assignedSeats == 5 * sPlan[0].length);
    }

    public static boolean isSmokingEconomicFull(char[][] sPlan)
    {
          int i, j;

          int assignedSeats = 0;

        for(i = 7; i < 13; i++)
                for(j = 0; j < sPlan[0].length; j++)
                      if(sPlan[i][j] == 'X')
                            assignedSeats++;

          return (assignedSeats == 6 * sPlan[0].length);
    }

    public static void selectSeatNumber(int startRows, int endRows,
                                IntClass rowNo, CharClass columnNo)  throws IOException
    {

          System.out.print("Enter Row number " + startRows + " - "
                       + endRows + ": ");
          rowNo.setNum(Integer.parseInt(keyboard.readLine()));
          System.out.println();

          while(rowNo.getNum() < startRows || rowNo.getNum() > endRows)
          {
                System.out.print("Enter Row number " + startRows + " - "
                            + endRows + ": ");
                rowNo.setNum(Integer.parseInt(keyboard.readLine()));
            System.out.println();
          }

          System.out.print("Enter seat number (A - F): ");
        columnNo.setChar(keyboard.readLine().charAt(0));
          System.out.println();

          while(columnNo.getChar() < 'A' || columnNo.getChar() > 'F')
          {
                System.out.print("Enter seat number (A - F): ");
                columnNo.setChar(keyboard.readLine().charAt(0));
                System.out.println();
          }
    }

    public static void assignFirstClassSeat(char[][] sPlan) throws IOException
    {
          IntClass rowNum = new IntClass();
          CharClass columnPos = new CharClass();

          if(!isFirstClassFull(sPlan))
          {
                selectSeatNumber(1, 2, rowNum, columnPos);

                while(sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] != '*')
                {
                      System.out.println("*#*#*#*# This seat is occupied *#*#*#*#");
                      System.out.println("Make another selection");

                      showSeatAssignments(sPlan);

                      selectSeatNumber(1, 2, rowNum, columnPos);
                }

                sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] = 'X';
                System.out.println("This seat is reserved for you");
          }
          else
                System.out.println("Sorry!!! First Class is Full");
    }

    public static void assignEconomicSeat(char[][] sPlan) throws IOException
    {
          char seatType;

          if(!isNonSmokingEconomicFull(sPlan) &&
              isSmokingEconomicFull(sPlan))
                      assignSeatNonSmokingEconomic(sPlan);
          else
                if(isNonSmokingEconomicFull(sPlan) &&
                      !isSmokingEconomicFull(sPlan))
                          assignSeatSmokingEconomic(sPlan);
                else
                      if(!isNonSmokingEconomicFull(sPlan) &&
                          !isSmokingEconomicFull(sPlan))
                      {
                            System.out.print("Enter seat type: smoking (S/s), nonsmoking (N/n): ");
                            seatType = keyboard.readLine().charAt(0);
                            System.out.println();

                            while(seatType != 'S' && seatType != 's' &&
                                    seatType != 'N' && seatType != 'n')
                            {
                                  System.out.println("Invalid seat type.");
                                  System.out.print("Enter smoking (S/s), nonsmoking (N/n): ");
                                  seatType = keyboard.readLine().charAt(0);
                                  System.out.println();
                            }

                          if(seatType == 'N' || seatType == 'n')
                                  assignSeatNonSmokingEconomic(sPlan);
                            else
                                  assignSeatSmokingEconomic(sPlan);
                      }
                      else
                            System.out.println("Economic Class is Full");
    }

    public static void assignSeatNonSmokingEconomic(char[][] sPlan) throws IOException
    {
          IntClass rowNum = new IntClass();
          CharClass columnPos = new CharClass();

          if(!isNonSmokingEconomicFull(sPlan))
          {
                selectSeatNumber(3, 7, rowNum, columnPos);

                while(sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] != '*')
                {
                      System.out.println("*#*#*#*# This seat is occupied *#*#*#*#");
                      System.out.println("Make another selection");

                      showSeatAssignments(sPlan);

                      selectSeatNumber(3, 7, rowNum, columnPos);
                }

                sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] = 'X';
                System.out.println("This seat is reserved for you");
          }
          else
                System.out.println("Non smoking section of economic class is Full");
    }

    public static void assignSeatSmokingEconomic(char[][] sPlan) throws IOException
    {
          IntClass rowNum = new IntClass();
          CharClass columnPos = new CharClass();

          if(!isSmokingEconomicFull(sPlan))
          {
                selectSeatNumber(8, 13, rowNum, columnPos);

                while(sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] != '*')
                {
                      System.out.println("*#*#*#*# This seat is occupied *#*#*#*#");
                      System.out.println("Make another selection");

                      showSeatAssignments(sPlan);

                      selectSeatNumber(8, 13, rowNum, columnPos);
                }

                sPlan[rowNum.getNum() - 1][(int)columnPos.getChar() - 65] = 'X';
                System.out.println("This seat is reserved for you");
          }
          else
                System.out.println("Smoking section of economic class is Full");
    }
}