#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
#include <sstream>

using namespace std;
/*
This program will compute pace based on
distance and time.
*/

bool isValidDistance( string, double & );
int getTimePart( string );

int main()
{

	double distance; //for reading in the distance

	int paceMinutes; //for the pace calculation
	int paceSeconds; //for the pace calculation
	int distanceTenths; //the distance in tenths as an int

	int hours; //this will be the time in hours
	int seconds; //this will be the time in seconds
	int minutes; //this is the time in minutes

	int totalTime; //the total time computed as seconds

	int secondMile;  //the seconds per mile

	string distanceStr; //used for reading in the distance
	string hoursStr; //used for reading in the hours
	string minStr; //used for reading in the minutes
	string secStr; //used for reading in the seconds
	
	//prompt the user for their distance
	//if they enter bogus info, then we will prompt again
	do
	{
		cout << "Tell me how far you ran: ";
		getline( cin , distanceStr ); // read in the distance
		if ( isValidDistance( distanceStr, distance ) )
			distanceTenths = distance * 10; //compute the distance in terms of tenths
	}while( distance == 0 ); //keep looping if the distance is still 0

	//set total time to 0
	totalTime = 0;
	while ( totalTime == 0 )//while total time is 0 loop
	{
		cout << endl << endl << "How long did it take you?";
		cout << endl << "Tell me your hours: ";
		cin.ignore( 200, '\n' );
		getline( cin, hoursStr ); //read the hours
		hours =  getTimePart( hoursStr );
		//get the minutes
		cout << endl << "Tell me your minutes: ";
		getline( cin, minStr );
		//repeat logic from above, but now checking minutes
		minutes = getTimePart( minStr );
		//get the seconds
		cout << "Tell me your seconds: ";
		getline( cin, secStr );
		//repeat the logic again to check for valid input
		seconds = getTimePart( secStr );

		//compute total time
		//if the user entered bad input this will be 0
		//if the use just pressed enter three times this will be 0
		//in both case total time will be 0 and the loop will go again.
		totalTime = ( hours * 3600 ) + ( minutes * 60 ) + seconds;
	}
	//now compute how many seconds per mile 
	secondMile  = 10 * ( (double)totalTime / distanceTenths );
	//compute pace minutes
	paceMinutes = secondMile / 60;
	//compute pace seconds
	paceSeconds = secondMile % 60;

	cout << endl << endl;
	//print out the pace
	cout << "Your pace is: " << paceMinutes << ":" << setw(2) << setfill('0') << paceSeconds << setfill( ' ' ) << endl;

	return 0;
}

bool isValidDistance( string distanceStr, double &distance )
{
	int counter = 0;
	bool goodInput = true;
			//loop through the input
		while( counter < distanceStr.length() && goodInput)
		{
			//if the character we are looking at is a digit or a period
			if ( isdigit( distanceStr[counter] ) || distanceStr[counter] == '.' )
				goodInput = true; //the input is good
			else
				goodInput = false; //the input is bad
			counter++;//increment the counter so we can look at the next character
		}
		//check to see if the input was good
		if ( goodInput )
		{
			istringstream iss(distanceStr);
			iss >> distance;	//get the distance out of the string
		}
		else
			distance = 0;//reset distance to 0 so the loop will continue

	return goodInput;
}

int getTimePart( string timePartStr )
{
		int timePart;
		if ( timePartStr == "" ) //if they just press enter
			timePart = 0; //set hours to 0
		else
		{	//otherwise check for valid input a la the loop above
			int counter = 0;
			bool goodInput = true;

			while( counter < timePartStr.length() && goodInput)
			{
				if ( isdigit( timePartStr[counter] ) )
					goodInput = true;
				else
					goodInput = false;
				counter++;
			}

			if ( goodInput ) //if the input was good
			{
				istringstream iss(timePartStr);
				iss >> timePart; //grab the hours out	
			}
			else
				timePart = 0; //else set the hours to 0
		}
	return timePart;
}