Purpose: This is a Cashier Calculations Program that displays
//          on the screen item codes with corresponding item description
//          and price. It asks the user to enter a valid code of the item
//          purchased by the customer, or it displays an error message
//          otherwise.
//
//         1- Assume there are flat prices(declared as constants) for the five
//            items (Apple, Orange, Water Melon, Mango and Grapes). Each of these
//            items has a unique code as following: Apple's code is 101, Orange's code
//            is 102, Grape's code is 103, Water Melon's code is 104 and Mango's code
//            is 105.
//
//         2- Assume the tax rate will be based on the chosen state as following:
//            Wisconsin tax rate is 6%, Illinois tax rate is 5% and
//            Indiana tax rate 4%.
//
//         3- Assume there will a discount applied based on the total value,
//            if the total below 100 then no discount applied,
//            if the (total >= 100 && total < 200), the discount is 0.1,
//            if the (total >= 200 && total < 350), the discount is 0.12, and
//            if the (total >= 350), the discount is 0.13.
//
//         4- The user will be asked to enter a valid state among three states as following:
//            WI, wisconsin , Wisconsin
//            IL, illinois, Illinois
//            IN, indiana, Indiana
//
//         5- There will be a void function to display the results.  This function will
//            ONLY perform output. You will need to Set the width to 10 for each output according
//            to the sample run in Lab6.txt
//
// Input:   code, total.
//
// Output:  purchased item with prices, total prices with tax
//--------------------------------------------------------------------


#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

// DO_2: Define the constant APPLE_PRICE, ORANGE_PRICE and WIDTH
const float W_MELON_PRICE = 30.00f;
const float MANGO_PRICE = 30.25f;
const float GRAPES_PRICE = 35.25f;
const float APPLE_PRICE = 31.00f;
const float ORANGE_PRICE = 31.25f;
const float WIDTH = 10.00f;

// state taxes
const float IN_TAX = 0.04f;
const float IL_TAX = 0.05f;
const float WI_TAX = 0.06f;

// price discounts
const float DISCOUNT_TWO = 0.12F;
const float DISCOUNT_THREE = 0.13F;
const float DISCOUNT = 0.1F;

// DO_3: Complete the prototype for Calculate_Total function and
//       Calculate_Discount function, See function definition and
//       functions' calls below.
void Display_Price(int code);
float Calculate_Tax(float total);

// functions for getting and checking the variable code
int Get_Code();
bool Valid_Code(int code);

int main()
{
   int code;
   float total = 0;
   cout << "=========Welcome to our Market========" << endl;

// DO_4:  Provide the priming read for the Sentinel Control Loop
//        Look at the while statement below for details on what is
//        necessary. Hint, you need to call get_code() function before
//        entering the while loop.

   cin >> code >> total;

   while (code != -1)
   {
        // DO_5:  Call function Display_Price


      total = Calculate_Total(code, total);

      // DO_6:  Call function Get_Code ().
	  // Assign the returned value to code

      cout << endl;

   }

   cout << "Total: " << total << endl;
   total -= Calculate_Discount(total);
   cout << "Total with discount: " << total << endl;
   total += Calculate_Tax(total);
   cout << "Total with tax: " << total << endl;
   cout << endl;
   return 0;

}

//---------------------------------------------------------------------
// Function to display the price for the selections
// params: in
//-------------------------------------------------------------------

void Display_Price(int code)
{
   cout << setw(WIDTH) << code << setw(WIDTH);
   if (code == 101)
      cout << "Apple" << setw(WIDTH) << '$' << APPLE_PRICE << endl;
   else if (code == 102)
      cout << "Orange" << setw(WIDTH) << '$' << ORANGE_PRICE << endl;

// DO_7:  Complete the function body for display_price.
//        Check the other values of 103, 104 for the variable code.
//        Set the width for each output according to the
//        sample run in Lab6.txt

   else if ( )

   else if ( )


   else
      cout << "Mango" << setw(WIDTH) << '$' << GRAPES_PRICE << endl;
}

//---------------------------------------------------------------------
// Function to calculate the total
// parms: in, in
//-------------------------------------------------------------------
// DO_8:  Complete the function header for Calculate_Total.
//         Check the function prototype for details on this function.
  Calculate_Total( )
{
   if (code == 101)
      total += APPLE_PRICE;
   else if (code == 102)
      total += ORANGE_PRICE;
   else if (code == 103)
      total += GRAPES_PRICE;
   else if (code == 104)
      total += W_MELON_PRICE;
   else if (code == 105)
      total += MANGO_PRICE;
   else
      total += 0;
   return total;
}

//---------------------------------------------------------------------
// Function to calculate the tax for the total
// also it asks for the state, applies new tax.
// cin is used to get the "state" variable in this
// function
// params: in
//---------------------------------------------------------------------

float Calculate_Tax(float total)
{
   float tax = 0;

   string state;
   bool state_recognized = false;

   while (!state_recognized && total != 0)
   {
      cout << endl << "Please enter the state you are in : ";
      cin >> state;
      cout << endl;

      if (state == "Indiana" || state == "indiana" || state == "IN")
      {
         tax = total * IN_TAX;
         state_recognized = true;
      }
      else if (state == "Illinois" || state == "illinois"
         || state == "IL")
      {
         tax = total * IL_TAX;
         state_recognized = true;
      }
      else if (state == "Wisconsin" || state == "wisconsin"
         || state == "WI")
      {
         tax = total * WI_TAX;
         state_recognized = true;
      }
      else
      {
         cout << endl << "State not recognized." ;
         state_recognized = false;
      }

   }

   return tax;
}

//---------------------------------------------------------------------
// Function to calculate the discount if the total >$100.
// discount conditions for beween $100 and $200,
// between $200 and $350, and greater than 350
// params: in
//---------------------------------------------------------------------

float Calculate_Discount(float total)
{
   if (total < 100)
      return 0;
   else if (total >= 100 && total < 200)
      return total * DISCOUNT;
   else if (total >= 200 && total < 350)
      return total * DISCOUNT_TWO;
   else
      return total * DISCOUNT_THREE;

}

//---------------------------------------------------------------------
// function that gets the code, and then validates the code by
// using the Valid_Code() function. The code loops until a valid code
// or the exit command is entered.
// params: in
//---------------------------------------------------------------------

int Get_Code()
{
   int out_code;
   bool good_code = false;
   while (!good_code)
   {
      cout << endl << "Enter Code:";
      cin >> out_code;
      good_code = Valid_Code(out_code);
   }

   return out_code;

}

//---------------------------------------------------------------------
// function to check whether the code is valid, using the same
// bounds as the checking in the other functions, and replaces the
// redundant error output from the Display_Price() function
// params: in
//---------------------------------------------------------------------

bool Valid_Code(int code)
{
   if (code >= 101 && code <= 105 || code == -1)

      return true;

   else
   {
      cout << "Incorrect code !!!! " << endl;
      return false;
   }

}