/******************  Assignment No. 3  :  Solution  **********************/

using namespace std;

#include<iostream>
#include <cstring>
#include <conio.h>

// Definition of customer class
class customer{      
      
      friend double calculateBill(customer*);       // Declaration of Non-member friend function
      private:
              char name[30];
              int custID;
              double spending;
              double tax;
              double discount;
              
              
              
      public:
             customer();                              //Default constructor
             customer(char[], int, double);           //Parameterized constructor
             
             /*Setter and getter functions for the class*/
             void setName(char[]);
             void setID(int);
             void setSpending(double);
             char* getName();
             int getID();
             double getSpending();
                                
                   };


// Default constructor Definition
customer::customer()
 {
      strcpy(name, "No Name");
      custID = 0;
      spending = tax = discount = 0;
      
         }              

// Parameterized constructor Definition
customer :: customer(char Name[], int ID, double Spending)
 {
      strcpy(name, Name);
      custID = ID;
      spending = Spending;
      tax = 0;
      discount = 0;
      
      }

//Definition of setter and getter functions
void customer :: setName(char Name[])
 {
     strcpy(name, Name);
     }

void customer :: setID(int ID)
 {
     custID = ID;
     }

void customer :: setSpending(double Spending)
 {
     spending = Spending;
     }

char* customer :: getName()
 {
      return name;
      }
      
int customer :: getID()
 {
       return custID;
       }

double customer :: getSpending()
 {
       return spending;
       }


/* Defining friend function calculateBill which takes an object as parameter and calculates total bill
after adding tax and subtracting discount from the bill*/
double calculateBill(customer *obj)
 {
       double bill = 0;
       
       if(obj->spending <= 5000)   //if the spending is less than 5000, then tax is 5% and discount is 1%
         {
              obj->tax = obj->spending *  5 / 100;
              obj->discount = obj->spending * 1 / 100;
              bill = obj->spending + obj->tax - obj->discount;
         }
       
       else if(obj->spending > 5000 && obj->spending <=10000) //if the spending is more than 5000 and less than 10000, then tax is 10% and discount is 2%
        {
            obj->tax = obj->spending *  10 / 100;
            obj->discount = obj->spending * 2 / 100;
            bill = obj->spending + obj->tax - obj->discount;
            }

        else       //if the spending is more than than 10000, then tax is 15% and discount is 3%
         {
            obj->tax = obj->spending *  15 / 100;
            obj->discount = obj->spending * 3 / 100;
            bill = obj->spending + obj->tax - obj->discount;
            }
         return bill;    // Function returns the final value of bill calculated in one of above three condition blocks 
         }



int main(){
    
char NAME[30];
int id = 0;
double Spending = 0;

//Creating object with default constructor
customer *cus1 = new customer();      //cus1 is a pointer to an object of type customer    

/*Following code is showing the values of data members of object pointed by cus1*/
cout << "Bill detail for customer 1, initialized with default constructor" <<endl;  
cout <<"Customer Name : " << cus1->getName() << endl << "ID : " << cus1->getID() << endl << "Spending : " << cus1->getSpending() << endl << "Total Bill :  " << calculateBill(cus1) << endl;
cout << endl << endl;

//Creating object with parameterized construcor
customer *cus2 = new customer("Ali", 112, 8550);

/*Following code is showing the values of data members of object pointed by cus2*/
cout << "Bill detail for customer 2, initialized with parameterized constructor" <<endl;  
cout <<"Customer Name : " << cus2->getName() << endl << "ID : " << cus2->getID() << endl << "Spending : " << cus2->getSpending() << endl << "Total Bill :  " << calculateBill(cus2) << endl;
cout << endl << endl;

//Creating object with default constructor
customer *cus3 = new customer();

/*The following code takes input in three ordinary variables and then these variables are passed to
object pointed by the pointer cus3, through setter functions*/
cout << "Enter name of customer 3 : ";
cin >> NAME;

cout << "Enter ID of customer 3 : ";
cin >> id;

cout << "Enter total spending of customer 3 : ";
cin >> Spending;

cus3->setName(NAME);
cus3->setID(id);
cus3->setSpending(Spending);
cout << endl;

//Showing the values of object pointed by the pointer cus3.
cout << "Bill detail for customer 3, input entered by the user" <<endl;  
cout <<"Customer Name : " << cus3->getName() << endl << "ID : " << cus3->getID() << endl << "Spending : " << cus3->getSpending() << endl << "Total Bill :  " << calculateBill(cus3) << endl;
cout << endl << endl;

getch();

}