//  Description:
/**
**  A supermarket console application that allows administrators to add items, change stocks in order to let
**  customers purchase desired item.
**  Customers can display the items, check prices and quantity.
**  The application allows customer to add desired items into cart and eventually generate a full billing report.
*/

//  Authors
/**
    Name: Rezwan Sheikh
    ID - 0332268
    Name : Ashiqur Rahman Hrithik
    ID - 0332301
*/

//Included Libraries
#include <iostream>
#include<cstdlib>



using namespace std; //using standard namespace

class Super{
    public:
    int i; //for loop iterator
    int n; //number of items available in inventory
    double total; //total price of item purchased
    int go; // variable used to return to main menu

   //Constructor used to initialize total to 0
   super(){
   total=0;

   }
    //function used to add items to inventory
    void add_items(int no[], string name[], string date[], double price[], int stock[], int arraySize){

        string userName;
        string pass;
        cout<<"\t\tEnter administrator login name\t\t"<<endl;
        cout <<"\t\t";
        cin>>userName;
        cout<<"\t\tEnter administrator password\t\t"<<endl;
        cout << "\t\t";
        cin>>pass;
        if(userName != "Admin" && pass!="1234"){
                cout<<"Login Unsuccessful! Adding items is only for administrators"<<endl;
                menu();}
           else{
        cout<<"\n\t\tAdd number of items to be added: ";
        cin>>n;

        // loop that allows information to be entered for each item. Terminates at the last item.
        for(i=0;i<n;i++){
            cout<<"\n";
            cout<<"\t\t****** Item Details ******\n\n";
            cout<<"\t\tItem number: ";
            cin>>no[i];
            cout<<"\t\tItem name: ";
            cin>>name[i];
            cout<<"\t\tManufacturing date: ";
            cin>>date[i];
            cout<<"\t\tPrice: ";
            cin>>price[i];
            cout<<"\t\tStock: ";
            cin>>stock[i];
        }
          cout<<"Hit 0 to go back to main menu"<<endl;
          cin>>go;
          if(go==0)
            menu(); //function call that allows user to return to main menu
          }
    }
    // Displays the items and its information in the inventory.
    void display_items(int no[], string name[], string date[], double price[], int stock[], int arraySize){

        cout<<"\n\n\t\tAvailable Items: \n\n";

        for(i=0; i<n; i++){

            //Displays all information for each item
            cout<<"\t\tItem No:  "<<no[i];
            cout<<"\n\t\tItem Name: "<<name[i];
            cout<<"\n\t\tManufacturing date: "<<date[i];
            cout<<"\n\t\tPrice: "<<price[i];
            cout<<"\n\t\tStock: "<<stock[i];
            cout<<"\n\n";
        }

          cout<<"\t\tHit 0 to go back to main menu"<<endl;
          cin>>go;
          if(go==0)
            menu(); //Function call that allows the user to return to main menu


    }

        //Allows user to search individual items. If item name matches user's input and its stock is not zero, the user can purchase the item.
       void shop_items(string name[], int stock[], string cart[],int quantity[], int arraySize ){
       string item_name;

      for(i=0;i<n;i++){
            cout<<"\t\tEnter name of item"<<endl;
            cout<<"\t\t";
            cin>>item_name;
         // if user's input matches with item name in the inventory, the customer can add the item to cart.
            if(item_name==name[i] && stock[i]!=0){
            cout<<"\t\tThe item "<<name[i]<< " is available"<<endl;
            cout<<"\t\tEnter number of "<<name[i]<< " to buy "<<endl;
            cin>>quantity[i]; //prompts user to enter number of desired items to add to cart
            stock[i]-=quantity[i]; // Removed quantity purchased from stock.
            cart[i]=name[i]; //Adds item name to cart
            cout<<"\t\tItem "<<name[i]<<"is added to cart"<<endl;
        }
             else if(item_name==name[i]&&stock[i]==0){
            cout<<"\t\tThe item is currently out of stock"<<endl;
        }

         // if user's input does not match with item name in the inventory, it exits that iteration and starts iterating again.
            else if(item_name!=name[i]&&stock[i]!=0){
               continue;
            }

      }
          cout<<"\t\tHit 0 to go back to main menu"<<endl;
          cout <<"\t\t";
          cin>>go;
          if(go==0)
            menu(); //function call that allows user to return to main menu

   }

    //Generates a bill report that calculates total price of items added to cart
   void bill(string name[], double price[], string cart[],int quantity[],int no[], int arraySize){
      total=0;

        cout<<"\n\n\t\t*******************************************************";
        cout<<"\n\n\t\t                     BILL DETAILS";
        cout<<"\n\n\t\t*******************************************************";
        cout<<"\n\n";
        cout<<"\t\t     Name\tQuantity\tPrice"<<endl;
       for(i=0; i<n;i++){
            // If item name in cart does not match with item name in inventory, it exits that specific iteration and starts iterating again.
            if(cart[i]!=name[i]){
                continue;
            }
        // If item name in cart matches with item name in inventory, it adds the price of that item to total price.
        else if(cart[i]==name[i]){
            total=total+price[i]; // Calculates total price of all items in cart
            cout<<"\t\t\t"<<name[i]<<"\t"<<quantity[i]<<"\t"<<price[i]<<endl;
        }
       }
         cout<<"\n\n\t\t*******************************************************";
        cout<<"\n\n\t\t                           Total Amount: RM."<<total<<"  "; //Shows total price
        cout<<"\n\n\t\t*******************************************************";

          cout<<"\n\t\tHit 0 to go back to main menu"<<endl;
          cin>>go;
          if(go==0)
            menu(); //function call that allows user to return to main menu

   }

  //Shows options available to user to navigate on the console
   void menu(){
          cout<<"\n\n";
        cout<<"\t1. Add items\n";
        cout<<"\t2. Show available items\n";
        cout<<"\t3. Shop items\n";
        cout<<"\t4. Generate bill report\n";
        cout<<"\t5. Exit\n";
        cout<<"\tchoice: ";
   }


};

int main()
{

    int arraySize=20;  // specifies size of each variable declared
    int no[arraySize]; // number of items in inventory
    string name[arraySize]; //item names in inventory
    string date[arraySize];// item manufacturing date
    double price[arraySize];// price of item in inventory
    int stock[arraySize]; // stock available for each item
    string cart[arraySize]; // item name added to cart
    int quantity[arraySize];// quantity of each item purchased
    int choice; //allows user to navigate through menu

    Super obj; // Creates an object for class super

   obj.menu();
    do{

        cin>>choice;

        switch(choice){
        case 1:
            obj.add_items(no, name, date, price, stock, arraySize); // function call that allows administrator to add item to inventory
            break;
        case 2:
            obj.display_items(no, name, date, price, stock, arraySize); //function call that allows to display all items
            break;
        case 3:
            obj.shop_items(name, stock, cart, quantity, arraySize); //function call that allows user to purchase items from inventory
            break;
        case 4:
            obj.bill(name, price, cart,quantity, no, arraySize); //function call that generates final billing report for items in cart
            break;
        case 5:
             system("cls");
            cout<<"\n\n\t\tThank you for shopping. Do come Again ! \n\n";
            break;

        }


    }while(choice != 6);// do end

    return 0;
}