//-------------- digitime.cpp --------------

#include <iostream>       // for cout, cin
#include "timer.h"       // for Display and Timer declarations

using namespace std;

//-------------- Definition of member functions for class Display

Display::Display(int lim) : LIMIT(lim)
// Initialize a new Display object.
{
   value = 0;
}

void Display::Increment()
// Add 1 to value.  If incrementing makes value
// equal to limit, reset value to zero.
{
   value++;
   if (value == LIMIT)
      value = 0;
}

bool Display::SetValue(int val)
// Set the value.  If the argument is negative, we make it positive.
// To make sure value is within the right range, we set the value to
// its remainder upon division by limit.
{
   if (val < 0 || val >= LIMIT)
      return false;

   value = val;
   return true;
}

int Display::GetValue() const
// Return the current value.
{
   return value;
}

void Display::Show() const
// Show the value of a Display.
{
   if (value < 10)          // Pad with a leading zero, if needed,
      cout << '0';

   cout << value;           // and in any case, display the value.
}

int Display::GetLimit() const
// Return the limit for this display
{
   return LIMIT;
}

//-------------- Definition of member functions for class Timer

Timer::Timer() : hours(24), minutes(60)
// Initialize a new Timer object,
// setting hours limit to 24 and minutes limit to 60.
{
   // All the work is done by the two constructor calls in the header.
}

Timer::Timer(int h, int m) : hours(24), minutes(60)
{
   if (Set(h,m) == false)
      Set(0,0);
}

void Timer::Increment()
// Add 1 minute to timer.
{
   minutes.Increment();

   if (minutes.GetValue() == 0) // We've turned the minute counter over,
      hours.Increment();        // so we have to increment the hours counter.
}

bool Timer::Set(int h, int m)
// Set hours and minutes from the keyboard.
{
   if (h < 0 || h >= hours.GetLimit())
      return false;
   if (m < 0 || m >= minutes.GetLimit())
      return false;

   hours.SetValue(h);
   minutes.SetValue(m);
   return true;
}

void Timer::Show() const
// Show the current timer's settings.
{
   hours.Show();
   cout << ':';
   minutes.Show();
}

Timer Timer::Add(const Timer& t) const
{
   int h = hours.GetValue() + t.hours.GetValue();
   int m = minutes.GetValue() + t.minutes.GetValue();

   if (m >= 60)
   {
      m = m - 60;		// subtract 60 minutes
      h++;			// add it to hours
   }

   if (h >= 24)
   {
      h = h - 24;
   }

   return Timer(h,m);		// build object and return
}