// 22.5HV2 Software Engineering II
// Unit 3 Exercise 3

#include "change.h" // contains #include <iostream.h>
#include <iomanip.h>

ostream& operator<<(ostream& outs, const Change& c) {
   outs << endl << setw(10) << c.one_p << " x 1p" << endl;
   outs << setw(10) << c.two_p << " x 2p" << endl;
   outs << setw(10) << c.five_p << " x 5p" << endl;
   outs << setw(10) << c.ten_p << " x 10p" << endl;
   outs << setw(10) << c.twenty_p << " x 20p" << endl;
   outs << setw(10) << c.fifty_p << " x 50p" << endl;
   outs << setw(10) << c.pound << " x pound coin" << endl;
   return outs;
}

istream& operator>>(istream& ins, Change& c) {
   cout << endl << "Enter number of one pence coins: ";
   ins >> c.one_p;
   cout << "Enter number of two pence coins: ";
   ins >> c.two_p;
   cout << "Enter number of five pence coins: ";
   ins >> c.five_p;
   cout << "Enter number of ten pence coins: ";
   ins >> c.ten_p;
   cout << "Enter number of twenty pence coins: ";
   ins >> c.twenty_p;
   cout << "Enter number of fifty pence coins: ";
   ins >> c.fifty_p;
   cout << "Enter number of pound coins: ";
   ins >> c.pound;
   return ins;
};

Change::Change(): one_p(0), two_p(0), five_p(0), ten_p(0), twenty_p(0), fifty_p(0), pound(0) {}

Change::Change(int one, int two, int five, int ten, int twenty, int fifty, int pnd):
	one_p(one), two_p(two), five_p(five), ten_p(ten), twenty_p(twenty), fifty_p(fifty), pound(pnd) {}

Change::Change(float amount) {
   int pence = int(100.0*amount), left=pence;
   pound    = pence/100;  left %= 100;
   fifty_p  = left/50;    left %= 50;
   twenty_p = left/20;    left %= 20;
   ten_p    = left/10;    left %= 10;
   five_p   = left/5;     left %= 5;
   two_p    = left/2;
   one_p    = left%2;
}
   
int Change::pence() const {
   return one_p + two_p*2 + five_p*5 + ten_p*10 + twenty_p*20 + fifty_p*50 + pound*100;
}

Change& Change::operator+=(const Change& c) {
   one_p += c.one_p;
   two_p += c.two_p;
   five_p += c.five_p;
   ten_p += c.ten_p;
   twenty_p += c.twenty_p;
   fifty_p += c.fifty_p;
   pound += c.pound;
   return *this;
}

Change& Change::operator-=(float amount) {
   Change sum=*this;
   int pennies=int(amount*100), num;
   if (*this<amount) {
      cout << "I'm sorry, I don't have that much money!" << endl;
      return *this;
   }
   num = pennies/100;
   if (sum.pound>num) {
      pennies-=num*100;
      sum.pound-=num;
   }
   else {
      pennies-=sum.pound*100;
      sum.pound=0;
   }
   num=pennies/50;
   if (sum.fifty_p>num) {
      pennies-=num*50;
      sum.fifty_p-=num;
   }
   else {
      pennies-=sum.fifty_p*50;
      sum.fifty_p=0;
   }
   num=pennies/20;
   if (sum.twenty_p>num) {
      pennies-=num*20;
      sum.twenty_p-=num;
   }
   else {
      pennies-=sum.twenty_p*20;
      sum.twenty_p=0;
   }
   num=pennies/10;
   if (sum.ten_p>num) {
      pennies-=num*10;
      sum.ten_p-=num;
   }
   else {
      pennies-=sum.ten_p*10;
      sum.ten_p=0;
   }
   num=pennies/5;
   if (sum.five_p>num) {
      pennies-=num*5;
      sum.five_p-=num;
   }
   else {
      pennies-=sum.five_p*5;
      sum.five_p=0;
   }
   num=pennies/2;
   if (sum.two_p>num) {
      pennies-=num*2;
      sum.two_p-=num;
   }
   else {
      pennies-=sum.two_p*2;
      sum.two_p=0;
   }
   if (pennies>sum.one_p) {
      cout << "I'm sorry - I don't have the correct change" << endl;
      return *this;
   }
   sum.one_p -= pennies;
   return (*this=sum);
}

Change::operator float() const {
   return pence()/100.0;
}

/*
bool Change::operator<(const Change& c) {
   return ( pence() < c.pence() );
}
*/