// Fig. 9.24: Date.cpp
// Date class member-function definitions.
#include <array>
#include <fmt/format.h>
#include <iostream>
#include <stdexcept>
#include "Date.h" // include Date class definition

// constructor confirms proper value for month; calls
// utility function checkDay to confirm proper value for day
Date::Date(int year, int month, int day)
   : m_year{year}, m_month{month}, m_day{day} {
   if (m_month < 1 || m_month > monthsPerYear) { // validate the month
      throw std::invalid_argument{"month must be 1-12"};
   }

   if (!checkDay(day)) { // validate the day
      throw std::invalid_argument{
         "Invalid day for current month and year"};
   }

   // output Date object to show when its constructor is called
   std::cout << fmt::format("Date object constructor: {}\n", toString());
}

// gets string representation of a Date in the form yyyy-mm-dd
std::string Date::toString() const {
   return fmt::format("{}-{:02d}-{:02d}", m_year, m_month, m_day);
}

// output Date object to show when its destructor is called
Date::~Date() {
   std::cout << fmt::format("Date object destructor: {}\n", toString());
}

// utility function to confirm proper day value based on 
// month and year; handles leap years, too
bool Date::checkDay(int day) const {
   // we ignore element 0
   static const std::array daysPerMonth{
      0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

   // determine whether testDay is valid for specified month
   if (1 <= day && day <= daysPerMonth.at(m_month)) {
      return true;
   }

   // February 29 check for leap year 
   if (m_month == 2 && day == 29 && (m_year % 400 == 0 ||
      (m_year % 4 == 0 && m_year % 100 != 0))) {
      return true;
   }

   return false; // invalid day, based on current m_month and m_year
}



/**************************************************************************
 * (C) Copyright 1992-2022 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 **************************************************************************/