UserController.java

package com.jtspringproject.JtSpringProject.controller;

import com.jtspringproject.JtSpringProject.models.Cart;
import com.jtspringproject.JtSpringProject.models.Product;
import com.jtspringproject.JtSpringProject.models.User;

import java.io.Console;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import com.jtspringproject.JtSpringProject.services.cartService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import com.jtspringproject.JtSpringProject.services.userService;
import com.jtspringproject.JtSpringProject.services.productService;
import com.jtspringproject.JtSpringProject.services.cartService;
import org.springframework.security.core.Authentication;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;


@Controller
public class UserController{

	private final userService userService;
	private final productService productService;
private final PasswordEncoder  passwordencoder;
	public UserController(userService userService, productService productService,PasswordEncoder passwordencoder) {
		this.userService = userService;
		this.productService = productService;
		this.passwordencoder=passwordencoder;
	}

	@GetMapping("/register")
	public String registerUser()
	{
		return "register";
	}

	@GetMapping("/buy")
	public String buy()
	{
		return "buy";
	}

	@GetMapping("/login")
	public ModelAndView userlogin(@RequestParam(required = false) String error) {
		
	    ModelAndView mv = new ModelAndView("userLogin");
	    if ("true".equals(error)) {
	        mv.addObject("msg", "Please enter correct email and password");
	    }
	    return mv;
	}
	
	@GetMapping("/")
	public ModelAndView indexPage()
	{
		ModelAndView mView  = new ModelAndView("index");	
		String username = SecurityContextHolder.getContext().getAuthentication().getName();
		   System.out.println( "home page"+username);

		mView.addObject("username", username);
		List<Product> products = this.productService.getProducts();

		if (products.isEmpty()) {
			mView.addObject("msg", "No products are available");
		} else {
			mView.addObject("products", products);
		}
		return mView;
	}
	
	@GetMapping("/user/products")
	public ModelAndView getproduct() {

		ModelAndView mView = new ModelAndView("uproduct");

		List<Product> products = this.productService.getProducts();

		if(products.isEmpty()) {
			mView.addObject("msg","No products are available");
		}else {
			mView.addObject("products",products);
		}

		return mView;
	}
	
	
	   @PostMapping("/userloginvalidate")
	    public ModelAndView userLoginValidate(@RequestParam String username,
	                                          @RequestParam String password) {
		   System.out.println(username);
		   System.out.println(password);

	        User user = userService.getUserByUsername(username);
			   System.out.println(user.getUsername());
  
	        ModelAndView mv = new ModelAndView();
	        if (user != null && passwordencoder.matches(password, user.getPassword())) {
	            // Login successful
	            // Optionally, manually set authentication in Spring Security context
	            Authentication auth = new UsernamePasswordAuthenticationToken(
	                    user.getUsername(),
	                    null,
	                    List.of(new SimpleGrantedAuthority(user.getRole().replace("ROLE_", "")))
	            );
	            SecurityContextHolder.getContext().setAuthentication(auth);

	            mv.setViewName("redirect:/"); // redirect to home page
	        } else {
	            // Login failed
	            mv.setViewName("userLogin");
	            mv.addObject("msg", "Invalid username or password");
	        }
	        return mv;
	    }
	
	
	@RequestMapping(value = "newuserregister", method = RequestMethod.POST)
	public ModelAndView newUseRegister(@ModelAttribute User user)
	{
		// Check if username already exists in database
		boolean exists = this.userService.checkUserExists(user.getUsername());

		if(!exists) {
			System.out.println(user.getEmail());
			user.setRole("ROLE_NORMAL");
			user.setPassword(passwordencoder.encode( user.getPassword()));
			this.userService.addUser(user);

			System.out.println("New user created: " + user.getUsername());
			ModelAndView mView = new ModelAndView("userLogin");
			return mView;
		} else {
			System.out.println("New user not created - username taken: " + user.getUsername());
			ModelAndView mView = new ModelAndView("register");
			mView.addObject("msg", user.getUsername() + " is taken. Please choose a different username.");
			return mView;
		}
	}

	@GetMapping("/profileDisplay")
	public String profileDisplay(Model model, HttpServletRequest request) {
		
		String username = SecurityContextHolder.getContext().getAuthentication().getName();
		User user = userService.getUserByUsername(username);
	
		if (user != null) {
			model.addAttribute("userid", user.getId());
			model.addAttribute("username", user.getUsername());
			model.addAttribute("email", user.getEmail());
			model.addAttribute("password", user.getPassword()); 
			model.addAttribute("address", user.getAddress());
	    } else {
	    	model.addAttribute("msg", "User not found");
	    } 

		return "updateProfile";
	}
	

	   //for Learning purpose of model
		@GetMapping("/test")
		public String Test(Model model)
		{
			System.out.println("test page");
			model.addAttribute("author","jay gajera");
			model.addAttribute("id",40);
			
			List<String> friends = new ArrayList<String>();
			model.addAttribute("f",friends);
			friends.add("xyz");
			friends.add("abc");
			
			return "test";
		}
		
		// for learning purpose of model and view ( how data is pass to view)
		
		@GetMapping("/test2")
		public ModelAndView Test2()
		{
			System.out.println("test page");
			//create modelandview object
			ModelAndView mv=new ModelAndView();
			mv.addObject("name","jay gajera 17");
			mv.addObject("id",40);
			mv.setViewName("test2");
			
			List<Integer> list=new ArrayList<Integer>();
			list.add(10);
			list.add(25);
			mv.addObject("marks",list);
			return mv;
			
			
		}


//	@GetMapping("carts")
//	public ModelAndView  getCartDetail()
//	{
//		ModelAndView mv= new ModelAndView();
//		List<Cart>carts = cartService.getCarts();
//	}
	  
}