//  Example Program for CS 1044 Notes
//
//  Student:       <put your name here>
//
//  Programmer:    William D McQuain
//  OS:            Windows NT Workstation 4.0
//  System:        Pentium II 400, 256 MB Memory
//  Compiler:      Visual C++ 6.0, Service Pack 4
//  Last modified: July 10, 2001
//
//  Purpose
//  This program reads data for one trip, including origin,
//  destination, distance and time.  The program converts the
//  trip time to minutes and computes the average MPH for the
//  trip.  
//
//  The program then writes a summary of its findings to an output
//  file.
//
#include <iostream>  // for cout
#include <fstream>   // for file streams
#include <iomanip>   // for formatting manipulators
#include <string>    // for string variables
#include <climits>   // for INT_MAX
using namespace std; // to put all of the above things in scope

int main() {

   const int MINPERHOUR    = 60;  // Number of minutes in an hour

   ifstream In("TripData.txt");  // Attach an input stream to the input file.

   // If the input file does not exist, this will detect that. 
   // We handle that by printing an error message and stopping the program.
   //
   if ( In.fail() ) {
      cout << "Data file not found: "     // Write an error message...
           << "TripData.txt"              //    including the file name.
           << endl                        // Bang "return"
           << "Exiting now..." << endl;   // Finish the message.
      exit(1);                            // Terminate a failed execution.
   }

   string tripOrigin,         // Name of starting point for trip.
          tripDestination;    // Name of destination for trip.
   int    tripMiles;          // Length of trip in miles.
                              // Time trip took is given as hh:mm so:
   int    tripHours,          //    hours field
          tripMinutes,        //    minutes field
          tripTime;           // Time for trip in minutes.
   double tripMPH;            // Speed of trip, in miles per hour.

   // Read the input data from the input stream:
   //
   In.ignore(INT_MAX, '\n');  // Skip over the two header lines in the
   In.ignore(INT_MAX, '\n');  //    input file.

   getline(In, tripOrigin, '\t');       // Read: the name of the trip origin.
   getline(In, tripDestination, '\t');  //       the name of the trip destination.
   In >> tripMiles;                     //       length of trip in miles
   In >> tripHours;                     //       hours field for trip time
   In.ignore(1, ':');                   //       colon separating hours and minutes
   In >> tripMinutes;                   //       minutes field for trip time


   // Calculate the total minutes for this trip:
   tripTime = MINPERHOUR * tripHours + tripMinutes;
   // Calculate the average MPH for this trip:
   tripMPH  = MINPERHOUR * double(tripMiles) / double(tripTime);


   ofstream Out("Summary.txt");  // Attach an output stream to the output file.
   Out << fixed << showpoint;    // Prepare output stream for decimal output.

   // Write identification information to output file:
   Out << "Programmer: " << "Bill McQuain" << endl;
   Out << "CS 1044 Notes Example" << endl;
   Out << endl;

   // Column headers and delimiter for top and bottom of output table:
   const string HEADERS    = "Origin              Destination         Mileage   Minutes     MPH";
   const string DELIMITER  = "-----------------------------------------------------------------";
   
   // Write output column headers and table delimiter to output file:
   Out << HEADERS << endl;
   Out << DELIMITER << endl;

   // Write the results for this trip:
   Out << left;                                  // left-justify names
   Out << setw(20) << tripOrigin;                //   in 20-column fields
   Out << setw(20) << tripDestination;
   Out << right;                                 // right-justify numbers
   Out << setw(7) << tripMiles                   //   in varied-width fields
       << setw(10) << tripTime
       << setw(8) << setprecision(1) << tripMPH  // write MPH to 1 decimal place
       << endl;

   // Write a delimiter for the bottom of the output table:
   Out << DELIMITER << endl;

   // Close the input and output files:
   In.close();
   Out.close();

   // Terminate a successful execution:
   return 0;
}