/* phone.cpp
 * CS401 - Intro to Comp Sci
 *
 * This program reads information about phone calls from a file and
 * displays that information on the screen.
 *
 * Each line in the data file should consist of information about one
 * call.  The format is as follows:
 *
 *   caller-name  callee-name  cost     start-hr start-min end-hr end-min
 *   (string)     (string)     (doub)   (int)    (int)     (int)  (int)
 *
 * Strings will not contain any spaces and the cost is per minute.
 *
 */
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
#include <conio>
#include <stdio>
using namespace std;

void openInputFile(ifstream&);
void displayTime(ostream&, int, int, bool=false);

int main() {

	// set up the input file
	ifstream fin;
	openInputFile(fin);

	// prepare the output format for the cost now
	cout << setiosflags(ios::fixed) << setprecision(2);

	// work through fin
	while (! fin.eof()) {

   		// these hold the information about the call being processed
   		string caller, callee;
		double cost;
		int shr, smin, ehr, emin;

		// load a call (one line in the input file)
		fin >> caller >> callee    // no spaces in the names, so this is ok
			>> cost >> shr >> smin >> ehr >> emin;

		// display the call information on the screen
		cout << caller << " called " << callee << " at " << cost
			<< " per minute\n   the call started at ";
		displayTime(cout, shr, smin);
		cout << " and ended at ";
		displayTime(cout, ehr, emin, true);

		// this clears out any whitespace in fin - we have to do this or
		// fin.eof() will not be true when it should be
		fin >> ws;
	}
	fin.close();

   	cout << "\n\npress a key.\n";
   	getch();
	return 0;
}

// this function will prepare f for input by getting the name from the user
// and opening the file
void openInputFile(ifstream &f) {
	string s;
	cout << "Enter data file name: ";
	getline(cin, s, '\n');
	f.open(s.c_str());    // we have to convert s to a c string for it to work
	if (!f) {
   		cout << "could not find input file.\n";
		getch();
		exit(-1);
	}
	cout << "file opened successfully.\n\n";
	return;
}

// this function prints the time (h:m) to the output stream given
// the third argument (cr) is optional and it represents whether or not to
//   insert a carriage return at the end of the time - the default value is
//   false (see the prototype for the default declaration)
void displayTime(ostream& out, int h, int m, bool cr) {
	out << h << ":";
	if (m < 10) out << 0;  // gives things like 1:05 and not 1:5
	out << m;
	if (cr) out << endl;
	return;
}