// composition1.cpp 	By: Aiman Hanna -  ©1993-2006 Aiman Hanna

// This program illustrates the concept of object composition. 
// Composition refers to the case when a class contains one or more data members that
// are objects from other classes. In this program, a car object contains an engine 
// and a car body. Both the engine and the body are objects of other classes; these 
// are the Engine and the CarBody classes. 
//
// The class that uses objects from other classes is called the client class, while 
// the classes that are used in the composition are called the supplier classes. In 
// this program, the Car class is a client class, while the Engine and CarBody classes
// are supplier classes.
//
// Key Points: 	 1) Object Composition.
//		 2) Client and supplier classes.
//		 3) Notice the use of default constructors for the supplier classes.

#include "composition1.h"

// Implementation of the Engine class

Engine::Engine(double hp, double pr)
{
 cout << "\n Creating an Engine object. " << endl;
 horsepower = hp;
 price = pr;
} 



double Engine::GetEngHp( void )
{
 return horsepower;
}



void Engine::SetEngHp( double hp )
{
 horsepower = hp;
}



double Engine::GetEngPrice( void )
{
 return price;
}



void  Engine::SetEngPrice( double pr )
{
 price = pr;
}





















// Implementation of the CarBody class

CarBody::CarBody( ava_color cl, double pr )
{
 cout << " Creating a CarBody object. " << endl;
 color = cl;
 price = pr;
}



ava_color CarBody::GetCarBodyColor( void )
{
 return color; 
}



void CarBody::SetCarBodyColor( ava_color cl )
{
 color = cl;
}



double CarBody::GetCarBodyPrice( void )
{
 return price;
}



void CarBody::SetCarBodyPrice( double pr )
{
 price = pr;
}




// Implementation of the Car class

Car::Car( void )
{
 cout << " Creating a Car object. " << endl;
 
// Initial price of the car is set to 1.5 * ( engine price + body price )

 price = 1.5 * ( eng.GetEngPrice() + body.GetCarBodyPrice() ); 
}							      




double Car::GetCarHorsepower( void )
{
return eng.GetEngHp( );

}



void Car::SetCarHorsepower( double hp )
{
 eng.SetEngHp( hp );
}












double Car::GetCarPrice( void )
{
 return price;
}



void Car::SetCarPrice( double pr )
{
// Set the car price is the passed value. If the price is less than the total price of the
// engine and the body, issue a warning message. 

 price = pr;
 if ( price < ( eng.GetEngPrice() + body.GetCarBodyPrice() ) )
  cout << " Warning: Selling with that price is a losing sale. Verify the price. " << endl;
}



void Car::SetCarColor( ava_color cl )
{
 body.SetCarBodyColor( cl );
}




char* Car::GetCarColor( void )
{
 switch (body.GetCarBodyColor())
 {
   case white: return "white";
   		 // There is no need for "break" here 
   case black: return "black";
   	
   case blue:  return "blue";
   		
   case green: return "green";
   	
   case red: return "red";
   		
  };
   return "Unknown";
}




void Car::ShowCarInfo()
{
cout << " The car has a horsepower of: " << GetCarHorsepower( ) 
     << " and the color of the car is: " << GetCarColor() << "." << endl
     << " The price of this car is: " << GetCarPrice() << endl;   

}


















// main function 

int main()
{
 Car c1, c2, c3;	// Create 3 car objects.

 cout << " \n Here is the information of car object c1: " << endl;
 c1.ShowCarInfo();
 
 cout << " \n Here is the information of car object c2: " << endl;
 c2.ShowCarInfo();
 
 cout << " \n Here is the information of car object c3: " << endl;
 c3.ShowCarInfo();



 cout << " \n Here is the information of car object c1 after updates: " << endl;

 c1.SetCarColor( black );
 c1.SetCarHorsepower( 200 );
 c1.SetCarPrice( 7000 );
 c1.ShowCarInfo();


 cout << " \n Here is the information of car object c2 after updates: " << endl;

 c2.SetCarColor( red);
 c2.SetCarHorsepower( 250 );
 c2.SetCarPrice( 5000 );
 c2.ShowCarInfo();

 
 cout << " \n Here is the information of car object c3 after updates: " << endl;

 c3.SetCarColor( blue);
 c3.SetCarHorsepower( 300 );
 c3.SetCarPrice( 20000 );
 c3.ShowCarInfo();

 return 0;
}


































// The result of running the program 
/*
 Creating an Engine object.
 Creating a CarBody object.
 Creating a Car object.

 Creating an Engine object.
 Creating a CarBody object.
 Creating a Car object.

 Creating an Engine object.
 Creating a CarBody object.
 Creating a Car object.

 Here is the information of car object c1:
 The car has a horsepower of: 40 and the color of the car is: white.
 The price of this car is: 9000

 Here is the information of car object c2:
 The car has a horsepower of: 40 and the color of the car is: white.
 The price of this car is: 9000

 Here is the information of car object c3:
 The car has a horsepower of: 40 and the color of the car is: white.
 The price of this car is: 9000

 Here is the information of car object c1 after updates:
 The car has a horsepower of: 200 and the color of the car is: black.
 The price of this car is: 7000

 Here is the information of car object c2 after updates:
 Warning: Selling with that price is a losing sale. Verify the price.
 The car has a horsepower of: 250 and the color of the car is: red.
 The price of this car is: 5000

 Here is the information of car object c3 after updates:
 The car has a horsepower of: 300 and the color of the car is: blue.
 The price of this car is: 20000


*/