//***************************************
// Program Name: calcparking.java       *
// Author: Pat Moss                     *
// Date: Oct 10, 2005  Rev. 02          *
//                                      *
// Demonstrate class "calcparking", etc.*
//***************************************

// calculate and display the parking fee
// for the current vehicle, as follows:

// Code: Desc.:  Parking Fees:
//   C   Cars:   First 2 hours = Free
//               Next  3 hours = 0.50/hour
//               Next 11 hours = 0.25/hour

//   T   Trucks: First 1 hours = Free
//               Next  2 hours = 1.00/hour
//               Next 13 hours = 0.75/hour

//   S   Senior Citizens: No charge

//   H   Display User Help screen

import java.util.Scanner;
import java.text.NumberFormat;

public class calcparking
{
 String inputstr;
 char glinputCode;
 String glinputCodestr;

 boolean inputcodeok = false;
 boolean bgntimeok = false;
 boolean endtimeok = false;
 boolean totalhrsok = false;

 double bgnhrs, endhrs, totalhrs;

 double glcheckHrs;
 double gldblHrs;
 double gltotalHrs;
 double glparkingFee;

 Scanner scan = new Scanner(System.in);

 // constructor
 calcparking()
 {
  initall();
 }

 // initialize all variables
 void initall()
 {
  inputstr = "";
  glinputCode = ' ';
  glinputCodestr = "";
  inputcodeok = false;
  bgntimeok = false;
  endtimeok = false;
  totalhrsok = false;
  bgnhrs = 0.0;
  endhrs = 0.0;
  totalhrs = 0.0;
  glcheckHrs = 0.0;
  gldblHrs = 0.0;
  gltotalHrs = 0.0;
  glparkingFee = 0.0;
 }

 // process the current vehicle information
 double getInputData()
 {
   initall();

   do
   {
    System.out.print ("Car(C), Truck(T), Senior(S), or Help(H)?");
    inputstr = scan.nextLine().toUpperCase();
    inputcodeok = checkinputcode(inputstr);
   } while (!inputcodeok);

   // System.out.println("** glinputCode: " + glinputCode);

   do
   { 
     // "S" = Senior citizen = "No charge"
     if (glinputCode == 'S') 
     {
      totalhrs = 0.0;
      gltotalHrs = 0.0;
      break;
     }

    do
    {
     System.out.print ("Begin time (HH:MM AM/PM)?");
     inputstr = scan.nextLine().toUpperCase();
     bgntimeok = checkinputtime(inputstr);
    } while (!bgntimeok);

    bgnhrs = glcheckHrs;
 
    do
    {
     System.out.print ("Exit time (HH:MM AM/PM)?");
     inputstr = scan.nextLine().toUpperCase();
     endtimeok = checkinputtime(inputstr);
    } while (!endtimeok);

    endhrs = glcheckHrs;

    totalhrs = endhrs - bgnhrs;
    gltotalHrs = Math.ceil (totalhrs);

    // System.out.print   ("**bgn/end/totalhrs/gltotalHrs: ");
    // System.out.print   (bgnhrs + " " + endhrs + " " + totalhrs);
    // System.out.println (" " + gltotalHrs);

    if((totalhrs < 0.0) || (totalhrs > 16.0))
    { // error -- do nothing here
    } else {
     totalhrsok = true;
    }
   } while (!totalhrsok);

   // calculate the Parking Fee
   glparkingFee = getParkingFee(glinputCode, gltotalHrs);

   // display the parking Code/Total hours/Parking Fee
   printReport (glinputCodestr, gltotalHrs, glparkingFee);

   // return the parking fee to the main driver program
   return glparkingFee;
 }

 // check for a valid input code
 // must be one of "C", "T", "S", or "H"
 boolean checkinputcode (String inpstr)
 {
  glinputCode = ' ';
  glinputCodestr = "";

  if (inpstr.length() != 1)
   return false;

  char inpcode = inpstr.charAt(0);

  switch (inpcode)
  {
   case 'C':
    glinputCode = inpcode;
    glinputCodestr = "Car";
    break;
   case 'T':
    glinputCode = inpcode;
    glinputCodestr = "Truck";
    break;
   case 'S':
    glinputCode = inpcode;
    break;
   case 'H':
    // "H" = Help = Display a Help screen
    System.out.println ("User Help:");
    System.out.println ("");
    System.out.println ("C   Cars:   First 2 hours = Free");
    System.out.println ("            Next  3 hours = 0.50/hour");
    System.out.println ("            Next 11 hours = 0.25/hour");
    System.out.println ("");
    System.out.println ("T   Trucks: First 1 hours = Free");
    System.out.println ("            Next  2 hours = 1.00/hour");
    System.out.println ("            Next 13 hours = 0.75/hour");
    System.out.println ("");
    System.out.println ("Hours are adjusted upward to next whole hour.");
    System.out.println ("");
    System.out.println ("S   Senior Citizens: No charge.");
    System.out.println ("");
    System.out.println ("H   This User Help screen.");
    System.out.println ("");
    return false;
   default:
    return false;
  }
  return true;
 }

 // check for a valid input time string value
 // valid input format is HH:MM XM (where X = "A" or "P")
 // and convert a valid input time to decimal hours since midnight
 // for example, 2:30 AM is 2.50 hours, and 2:30 PM is 14.50 hours
 boolean checkinputtime (String inpstr)
 {
  glcheckHrs = 0.0;

  if (inpstr.length() != 8)
   return false;

  if (!checkformat (inpstr, "99:99 XM"))
   return false;

  // fetch hours, minutes, and AM/PM from the input string
  String strHH = inpstr.substring(0,2);
  String strMM = inpstr.substring(3,5);
  String strXM = inpstr.substring(6,8);

  // System.out.println("inpstr: " + inpstr);
  // System.out.println("HH/MM/XM: " + strHH + " " + strMM + " " + strXM);
  // System.out.print  ("Lens: " + strHH.length() + " ")
  // System.out.println(strMM.length() + " " + strXM.length());

  // convert hours and minutes from string to integer format
  int intHH = Integer.parseInt(strHH);
  int intMM = Integer.parseInt(strMM);

  // compute total hours in decimal format
  double numhrs = (double) intHH + intMM / 60.0;

  // fix per Dave Hammer:
  // a. if hours >= 12, then subtract 12 from hours
  //    this applies for 12:xx AM and for 12:xx PM
  // b. if suffix = "PM", then add 12 back to hours
  // then we have decimal "military time, 
  // 00.00 hours to approx 23.99 hours

  if (numhrs >= 12.0)
   numhrs -= 12.0;

  if (strXM.equals("PM"))
   numhrs += 12.0;
  
  glcheckHrs = numhrs;
  return true;
 }

 // check for a valid string format

 // valid format characters include:
 // 9 = must be 0 to 9
 // X = must be A or P (for AM or PM)
 // Literal characters: space or : or M
 //
 // Example format string for an input time:
 // 99:99 XM
 // 
 boolean checkformat (String inpstr, String inpfmt)
 {
  int inplen = inpstr.length();

  for (int i=0; i<inplen; i++)
  {
   char inchr = inpstr.charAt (i);
   char infmt = inpfmt.charAt (i);

   switch (infmt)
   {
    case ' ':
     if (inchr != ' ')
      return false;
     break;
    case ':':
     if (inchr != ':')
      return false;
     break;
    case 'M':
     if (inchr != 'M')
      return false;
     break;
    case 'X':
     if ((inchr == 'A') || (inchr == 'P'))
     { // do nothing here
     } else {
     return false;
     }
     break;
    case '9':
     if ((inchr < '0') || (inchr > '9'))
      return false;
     break;
    default:
     return false;
   }
  }
  return true;
 }
     
 // calculate the parking fee
 // based on:
 // 1. The input code ("C", "T", "S", or "H")
 // 2. The total hours (0.0 to 16.0)

 // for the current vehicle, as follows:
 
 // Code: Desc.:  Parking Fees:
 //   C   Cars:   First 2 hours = Free
 //               Next  3 hours = 0.50/hour
 //               Next 11 hours = 0.25/hour
 
 //   T   Trucks: First 1 hours = Free
 //               Next  2 hours = 1.00/hour
 //               Next 13 hours = 0.75/hour
 
 //   S   Senior Citizens: No charge

 //   H   Help: No charge

 double getParkingFee (char inpcode, double tothrs)
 {
  // adjust total hours upward to the next whole hour value
  double dblhrs = Math.ceil (tothrs);
  double totfee = 0.0;

  // System.out.println ("tothrs,dblhrs: " + tothrs + " " + dblhrs);

  switch (inpcode)
  {
   case 'C':
    if (dblhrs <= 2.0)
    { totfee = 0.0;
    } else if ((dblhrs > 2.0) && (dblhrs <= 5.0))
    { totfee = (dblhrs - 2.0) * 0.50;
    } else 
    {
     totfee = (3) * 0.50;
     totfee += (dblhrs - 5.0) * 0.25;
    }
    break;
   case 'T':
    if (dblhrs <= 1.0)
    { totfee = 0.0;
    } else if ((dblhrs > 1.0) && (dblhrs <= 3.0))
    { totfee = (dblhrs - 1.0) * 1.00;
    } else 
    {
     totfee = (2.0) * 1.00;
     totfee += (dblhrs - 3.0) * 0.75;
    }
    break;
   case 'S':
    totfee = 0.0;
    break;
   case 'H':
    totfee = 0.0;
    break;
   default:
    totfee = 0.0;
    break;
  }
  return totfee;
 }

 // display the parking code, parking hours, and parking fee
 void printReport (String inpcodestr, double dblhrs, double parkfee)
 {
  // adjust total hours upward to the next whole hour value
  int inthrs = (int) Math.ceil(dblhrs);

  // Round the output to two decimal places
  NumberFormat fmt = NumberFormat.getCurrencyInstance();

  System.out.println ("");
  System.out.print   ("The " + inpcodestr);
  System.out.print   (" parking fee due for ");
  System.out.print   (inthrs + " hours is ");
  System.out.println (fmt.format(parkfee));
 }
}