#include <iostream>
#include <bits/stdc++.h>
#include <string.h>
#include <fstream>
using namespace std;
class Product
{
  int id;
  int price;
  char name[20];

public:
  void setId()
  {
    cout << "Enter ID : ";
    cin >> id;
  }

  int getId()
  {
    return id;
  }

  void setPrice()
  {
    cout << "Enter price : ";
    cin >> price;
  }

  int getPrice()
  {
    return price;
  }

  void setName()
  {
    cout << "Enter name : ";
    cin >> name;
  }

  char *getName()
  {
    return name;
  }
};

void writeproduct()
{
  fstream out("product.txt", ios::out | ios::app);
  Product p1;
  char ch;
  do
  {
    p1.setId();
    p1.setName();
    p1.setPrice();

    out.write((char *)&p1, sizeof(p1));
    cout << "if you want to enter another data\tpress Y/N \n";
    cin >> ch;
  } while (ch == 'Y' || ch == 'y');
  out.close();
}

void readproduct()
{
  Product p2;
  ifstream in;
  in.open("product.txt", ios::in);
  if (in.is_open())
  {
    cout << "Id\tName\tPrice\n";
    while (!in.eof())
    {
      in.read((char *)&p2, sizeof(p2));
      if (!in.eof())
        cout << p2.getId() << '\t' << p2.getName() << '\t' << p2.getPrice() << "\n";
    } // in.close();
  }
  else
  {
    cout << "Can't open the file \n";
  }
}

void searchproduct()
{

  Product p3; // creating new third object
  char str[10];
  bool found = false;
  cout << "Enter name to search for :";
  cin >> str;
  fstream in2;                      // check this
  in2.open("product.txt", ios::in); // check this
  if (in2.is_open())
  {
    in2.read((char *)&p3, sizeof(p3)); // read
    while (!in2.eof())
    { // check
      if (strcmp(str, p3.getName()) == 0)
      {

        cout << p3.getId() << '\t' << p3.getName() << '\t' << p3.getPrice() << "\n"; // print
        found = true;
      }
      in2.read((char *)&p3, sizeof(p3)); // read
    }
    if (!found)
      cout << "Name not found\n";
    in2.close();
  }
  else
    cout << "Cannot open this file"
         << "\n";
}

void updateproduct()
{
  Product p4;
  fstream f("product.txt", ios::in | ios::out);
  if (f.is_open())
  {
    char str[20];
    cout << "Enter the product name to update his record ";
    cin >> str;
    bool found = false;
    while (!f.eof())
    {
      f.read((char *)&p4, sizeof(p4));
      if (strcmp(str, p4.getName()) == 0)
      {
        cout << "Enter the new price for " << str << " ";
        p4.setPrice();
        int curpos = f.tellg();
        int stusize = sizeof(p4);
        f.seekp(curpos - stusize, ios::beg);
        f.write((char *)&p4, sizeof(p4));
        found = true;
        break;
      }
    }
    f.close();
    if (!found)
      cout << "Product name does not exist.\n";
  }
}

void deleterecord()
{
  fstream in("product.txt", ios::in);
  ofstream out("Product Temp.txt", ios::out);
  if (in.is_open())
  {
    Product p5;
    char str[20];
    int num;
    cout << "Enter the id of product to delete his record ";
    cin >> num;
    while (in.read((char *)&p5, sizeof(p5)))
    {
     if (num!=p5.getId())
      {
        out.write((char *)&p5, sizeof(p5));
      }
    }
    in.close();
    out.close();
    remove("product.txt");
    rename("Product Temp.txt", "product.txt");
  }
}

int main()
{
 // writeproduct();
   readproduct();
  // updateproduct();
  // readproduct();
  // searchproduct();
   deleterecord();
  //readproduct();
  //updateproduct();
  readproduct();

  return 0;
}