Day 2

src/main/java/dev/naman/splitwise_feb22/SplitwiseFeb22Application.java

@@ -4,23 +4,40 @@
 import dev.naman.splitwise_feb22.services.command.UpdateProfileCommand;
 import dev.naman.splitwise_feb22.services.command.registry.CommandRegistry;
 import dev.naman.splitwise_feb22.services.command.registry.CommandRegistryImp;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
 @SpringBootApplication
-public class SplitwiseFeb22Application {
+@EnableJpaAuditing
+public class SplitwiseFeb22Application implements CommandLineRunner {
+
+    @Autowired
+    private RegisterUserCommand registerUserCommand;
+
+    @Autowired
+    private UpdateProfileCommand updateProfileCommand;
+
+    @Autowired
+    private CommandRegistry commandRegistry;
 
     public static void main(String[] args) {
         SpringApplication.run(SplitwiseFeb22Application.class, args);
+    }
 
-        RegisterUserCommand registerUserCommand = new RegisterUserCommand();
-        UpdateProfileCommand updateProfileCommand = new UpdateProfileCommand();
-
-        CommandRegistry commandRegistry = new CommandRegistryImp();
+    @Override
+    public void run(String... args) throws Exception {
         commandRegistry.registerCommand(registerUserCommand);
         commandRegistry.registerCommand(updateProfileCommand);
 
-        String input = "u1 123 123";// read from command line
+        String input = "Register vinsmokesanji 003 namisswwaann";// read from command line
+
+        commandRegistry.executeCommand(input);
+
+        input = "2 UpdateProfile robinchwan";
 
         commandRegistry.executeCommand(input);
         // while (true) {
@@ -33,7 +50,6 @@ public static void main(String[] args) {
         // and that allows to parse commands to find the correct command out
         // of the ones that are registered
     }
-
 }
 
 

src/main/java/dev/naman/splitwise_feb22/controllers/UserController.java

@@ -0,0 +1,56 @@
+package dev.naman.splitwise_feb22.controllers;
+
+import dev.naman.splitwise_feb22.dto.*;
+import dev.naman.splitwise_feb22.models.User;
+import dev.naman.splitwise_feb22.services.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.stereotype.Service;
+
+@Controller
+public class UserController {
+    @Autowired
+    private UserService userService;
+
+    public ResponseDTO<RegisterUserResponseDTO>
+    registerUser(RegisterUserRequestDTO request) {
+        User user = userService.registerUser(
+                request.getName(),
+                request.getPhoneNumber(),
+                request.getPassword()
+        );
+
+        ResponseDTO<RegisterUserResponseDTO> response = new ResponseDTO<>();
+
+        if (user == null) {
+            response.setStatusCode(ResponseStatusCode.FAILURE);
+            return response;
+        }
+
+        response.setStatusCode(ResponseStatusCode.SUCCESS);
+        RegisterUserResponseDTO responseDTO = new RegisterUserResponseDTO();
+        responseDTO.setUserId(user.getId());
+        response.setData(responseDTO);
+        return response;
+    }
+
+    public ResponseDTO<UpdateProfileResponseDto> updateProfile(
+            UpdateProfileRequestDto requestDto
+    ) {
+        userService.updatePassword(requestDto.getUserId(),
+                requestDto.getNewPassword());
+        ResponseDTO<UpdateProfileResponseDto> res = new ResponseDTO<>();
+        res.setStatusCode(ResponseStatusCode.SUCCESS);
+        return res;
+    }
+
+}
+
+
+// controller
+// take request
+// unmarshall parameters
+// send those to a relevant service
+// get response from the service
+// construct appropriate response object
+// secde

src/main/java/dev/naman/splitwise_feb22/dto/RegisterUserRequestDTO.java

@@ -0,0 +1,12 @@
+package dev.naman.splitwise_feb22.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class RegisterUserRequestDTO {
+    private String name;
+    private String phoneNumber;
+    private String password;
+}

src/main/java/dev/naman/splitwise_feb22/dto/RegisterUserResponseDTO.java

@@ -0,0 +1,10 @@
+package dev.naman.splitwise_feb22.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class RegisterUserResponseDTO {
+    private Long userId;
+}

src/main/java/dev/naman/splitwise_feb22/dto/ResponseDTO.java

@@ -0,0 +1,20 @@
+package dev.naman.splitwise_feb22.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class ResponseDTO<T> {
+    public ResponseStatusCode statusCode;
+    public T data;
+}
+
+
+// ArrayList<Animal>
+// HashMap<Animal, Long>
+
+// class HashMap<T, X> {
+//   private List<T> keys;
+//   private List<X> values;
+// }

src/main/java/dev/naman/splitwise_feb22/dto/ResponseStatusCode.java

@@ -0,0 +1,6 @@
+package dev.naman.splitwise_feb22.dto;
+
+public enum ResponseStatusCode {
+    SUCCESS,
+    FAILURE,
+}

src/main/java/dev/naman/splitwise_feb22/dto/UpdateProfileRequestDto.java

@@ -0,0 +1,13 @@
+package dev.naman.splitwise_feb22.dto;
+
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.stereotype.Service;
+
+@Getter
+@Setter
+public class UpdateProfileRequestDto {
+    private Long userId;
+    private String newPassword;
+}

src/main/java/dev/naman/splitwise_feb22/dto/UpdateProfileResponseDto.java

@@ -0,0 +1,4 @@
+package dev.naman.splitwise_feb22.dto;
+
+public class UpdateProfileResponseDto {
+}

src/main/java/dev/naman/splitwise_feb22/repositories/UserRepository.java

@@ -0,0 +1,20 @@
+package dev.naman.splitwise_feb22.repositories;
+
+import dev.naman.splitwise_feb22.models.User;
+import org.springframework.data.domain.Example;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+
+    User save(User user);
+
+    Optional<User> findById(Long id);
+// select * from users where name == ""
+//    order by name asc;
+
+}

src/main/java/dev/naman/splitwise_feb22/services/UserService.java

@@ -0,0 +1,48 @@
+package dev.naman.splitwise_feb22.services;
+
+import dev.naman.splitwise_feb22.models.User;
+import dev.naman.splitwise_feb22.repositories.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+public class UserService {
+    @Autowired
+    UserRepository userRepository;
+
+    public User registerUser(String name,
+                             String phoneNumber,
+                             String password) {
+        User user = new User();
+        user.setName(name);
+        user.setHashedPassword(password);
+        user.setPhoneNumber(phoneNumber);
+
+        User userResponse = userRepository.save(user);
+
+        return userResponse;
+    }
+
+    public boolean updatePassword(Long userId,
+                                  String newPassword) {
+        // 1. find the user with the user id
+        // 2. update the password of the user
+        // 3. save the new user
+        Optional<User> user = userRepository.findById(userId);
+
+        System.out.println("Found a user");
+
+        if (user.isEmpty()) {
+            // TODO: Throw exception
+            return false;
+        }
+
+        User userObj = user.get();
+        userObj.setHashedPassword(newPassword);
+        userRepository.save(userObj);
+
+        return true;
+    }
+}

src/main/java/dev/naman/splitwise_feb22/services/command/RegisterUserCommand.java

@@ -1,12 +1,21 @@
 package dev.naman.splitwise_feb22.services.command;
 
+import dev.naman.splitwise_feb22.controllers.UserController;
+import dev.naman.splitwise_feb22.dto.RegisterUserRequestDTO;
+import dev.naman.splitwise_feb22.dto.RegisterUserResponseDTO;
+import dev.naman.splitwise_feb22.dto.ResponseDTO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Controller;
 import org.springframework.stereotype.Service;
 
 import java.util.Arrays;
 import java.util.List;
 
-@Service
+@Component
 public class RegisterUserCommand implements Command {
+    @Autowired
+    private UserController userController;
 
     @Override
     public boolean matches(String input) {
@@ -23,7 +32,29 @@ public boolean matches(String input) {
 
     @Override
     public void execute(String input) {
+        List<String> inputList = Arrays.stream(input.split(" ")).toList();
+        String username = inputList.get(1);
+        String phoneNumber = inputList.get(2);
+        String password = inputList.get(3);
+
+        RegisterUserRequestDTO registerUserRequestDTO = new RegisterUserRequestDTO();
+        registerUserRequestDTO.setName(username);
+        registerUserRequestDTO.setPassword(password);
+        registerUserRequestDTO.setPhoneNumber(phoneNumber);
+
+        ResponseDTO<RegisterUserResponseDTO> response = userController.
+                registerUser(registerUserRequestDTO);
         System.out.println("Registering User");
     }
 
 }
+
+// Dependency Inversion= D of SOLID.
+// No 2 classes should vbe directly dependent on each other. THey should depend
+// on each other via an abstraction layer
+
+
+// Dependecy Injection
+// The dependencies of a class are not created by the class, but passed t the class via constructor
+// Inversion of Control
+// Framework will create the dependencies and wirew them into the concrete objects;

src/main/java/dev/naman/splitwise_feb22/services/command/UpdateProfileCommand.java

@@ -1,17 +1,35 @@
 package dev.naman.splitwise_feb22.services.command;
 
+import dev.naman.splitwise_feb22.controllers.UserController;
+import dev.naman.splitwise_feb22.dto.UpdateProfileRequestDto;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Service;
 
 import java.util.Arrays;
 import java.util.List;
 
-@Service
+@Component
 public class UpdateProfileCommand implements Command {
     private static final int size = 3;
 
+    @Autowired
+    private UserController userController;
+
     @Override
     public void execute(String input) {
+        List<String> inputList = Arrays.stream(input.split(" ")).toList();
+
+        Long userId = Long.parseLong(inputList.get(0));
+        String newPassword = inputList.get(2);
+
+        UpdateProfileRequestDto updateProfileRequestDto = new UpdateProfileRequestDto();
+        updateProfileRequestDto.setNewPassword(newPassword);
+        updateProfileRequestDto.setUserId(userId);
+
+        userController.updateProfile(updateProfileRequestDto);
 
+        System.out.println("Updated User");
     }
 
     @Override

src/main/java/dev/naman/splitwise_feb22/services/command/registry/CommandRegistry.java

@@ -1,6 +1,8 @@
 package dev.naman.splitwise_feb22.services.command.registry;
 
 import dev.naman.splitwise_feb22.services.command.Command;
+import org.springframework.stereotype.Service;
+
 
 public interface CommandRegistry {
 

src/main/java/dev/naman/splitwise_feb22/services/command/registry/CommandRegistryImp.java

@@ -26,3 +26,5 @@ public void executeCommand(String input) {
         }
     }
 }
+
+// serializable