// Fig. 10.37: Commission.cpp
// Commission member-function definitions.
#include <fmt/format.h>
#include <stdexcept>
#include "Commission.h" // class definition

// constructor                                                        
Commission::Commission(double grossSales, double commissionRate)         
   : m_grossSales{grossSales}, m_commissionRate{commissionRate} {

   if (m_grossSales < 0.0) {
      throw std::invalid_argument("Gross sales must be >= 0.0");
   } 

   if (m_commissionRate <= 0.0 || m_commissionRate >= 1.0) {
      throw std::invalid_argument(
         "Commission rate must be > 0.0 and < 1.0");
   } 
}                                      

// calculate earnings
double Commission::earnings() const {
   return m_grossSales * m_commissionRate;       
}                                            

// return string containing Commission information
std::string Commission::toString() const {                       
   return fmt::format("gross sales: ${:.2f}; commission rate: {:.2f}", 
      m_grossSales, m_commissionRate);
}   


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