mealprep/backend/src/test/java/com/recipeapp/auth/AuthServiceTest.java

package com.recipeapp.auth;

import com.recipeapp.auth.dto.*;
import com.recipeapp.auth.entity.UserAccount;
import com.recipeapp.common.ConflictException;
import com.recipeapp.common.ResourceNotFoundException;
import com.recipeapp.common.ValidationException;
import com.recipeapp.household.HouseholdMemberRepository;
import com.recipeapp.household.entity.Household;
import com.recipeapp.household.entity.HouseholdMember;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.security.crypto.password.PasswordEncoder;

import java.util.Optional;

import static org.assertj.core.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.*;

@ExtendWith(MockitoExtension.class)
class AuthServiceTest {

    @Mock
    private UserAccountRepository userAccountRepository;

    @Mock
    private HouseholdMemberRepository householdMemberRepository;

    @Mock
    private PasswordEncoder passwordEncoder;

    @InjectMocks
    private AuthServiceImpl authService;

    @Test
    void signupShouldCreateUserAndReturnResponse() {
        var request = new SignupRequest("sarah@example.com", "s3cure!Pass", "Sarah");

        when(userAccountRepository.existsByEmailIgnoreCase("sarah@example.com")).thenReturn(false);
        when(passwordEncoder.encode("s3cure!Pass")).thenReturn("hashed");
        when(userAccountRepository.save(any(UserAccount.class))).thenAnswer(invocation -> {
            UserAccount saved = invocation.getArgument(0);
            return saved;
        });

        UserResponse result = authService.signup(request);

        assertThat(result.email()).isEqualTo("sarah@example.com");
        assertThat(result.displayName()).isEqualTo("Sarah");
        verify(userAccountRepository).save(any(UserAccount.class));
    }

    @Test
    void signupShouldThrowConflictWhenEmailExists() {
        var request = new SignupRequest("sarah@example.com", "s3cure!Pass", "Sarah");

        when(userAccountRepository.existsByEmailIgnoreCase("sarah@example.com")).thenReturn(true);

        assertThatThrownBy(() -> authService.signup(request))
                .isInstanceOf(ConflictException.class);
    }

    @Test
    void loginShouldReturnUserWhenCredentialsValid() {
        var request = new LoginRequest("sarah@example.com", "s3cure!Pass");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(passwordEncoder.matches("s3cure!Pass", "hashed")).thenReturn(true);
        when(householdMemberRepository.findByUserEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.empty());

        UserResponse result = authService.login(request);

        assertThat(result.email()).isEqualTo("sarah@example.com");
        assertThat(result.displayName()).isEqualTo("Sarah");
    }

    @Test
    void loginShouldThrowWhenEmailNotFound() {
        var request = new LoginRequest("unknown@example.com", "password");

        when(userAccountRepository.findByEmailIgnoreCase("unknown@example.com")).thenReturn(Optional.empty());

        assertThatThrownBy(() -> authService.login(request))
                .isInstanceOf(ResourceNotFoundException.class);
    }

    @Test
    void loginShouldThrowWhenPasswordInvalid() {
        var request = new LoginRequest("sarah@example.com", "wrongpass");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(passwordEncoder.matches("wrongpass", "hashed")).thenReturn(false);

        assertThatThrownBy(() -> authService.login(request))
                .isInstanceOf(ValidationException.class);
    }

    @Test
    void loginShouldThrowWhenAccountInactive() {
        var request = new LoginRequest("sarah@example.com", "s3cure!Pass");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");
        user.setActive(false);

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));

        assertThatThrownBy(() -> authService.login(request))
                .isInstanceOf(ValidationException.class);
    }

    @Test
    void getCurrentUserShouldReturnUserWithHouseholdInfo() {
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");
        var household = new Household("Smith family", user);
        var member = new HouseholdMember(household, user, "planner");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(householdMemberRepository.findByUserEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(member));

        UserResponse result = authService.getCurrentUser("sarah@example.com");

        assertThat(result.email()).isEqualTo("sarah@example.com");
        assertThat(result.householdName()).isEqualTo("Smith family");
        assertThat(result.householdRole()).isEqualTo("planner");
    }

    @Test
    void updateProfileShouldUpdateDisplayName() {
        var request = new UpdateProfileRequest("Sarah S.", null, null);
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(userAccountRepository.save(any(UserAccount.class))).thenAnswer(i -> i.getArgument(0));

        UserResponse result = authService.updateProfile("sarah@example.com", request);

        assertThat(result.displayName()).isEqualTo("Sarah S.");
    }

    @Test
    void updateProfileShouldChangePasswordWhenCurrentPasswordValid() {
        var request = new UpdateProfileRequest(null, "oldpass", "newpassword");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed_old");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(passwordEncoder.matches("oldpass", "hashed_old")).thenReturn(true);
        when(passwordEncoder.encode("newpassword")).thenReturn("hashed_new");
        when(userAccountRepository.save(any(UserAccount.class))).thenAnswer(i -> i.getArgument(0));

        authService.updateProfile("sarah@example.com", request);

        verify(passwordEncoder).encode("newpassword");
    }

    @Test
    void updateProfileShouldThrowWhenCurrentPasswordWrong() {
        var request = new UpdateProfileRequest(null, "wrongpass", "newpassword");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed_old");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));
        when(passwordEncoder.matches("wrongpass", "hashed_old")).thenReturn(false);

        assertThatThrownBy(() -> authService.updateProfile("sarah@example.com", request))
                .isInstanceOf(ValidationException.class);
    }

    @Test
    void updateProfileShouldThrowWhenNewPasswordWithoutCurrentPassword() {
        var request = new UpdateProfileRequest(null, null, "newpassword");
        var user = new UserAccount("sarah@example.com", "Sarah", "hashed");

        when(userAccountRepository.findByEmailIgnoreCase("sarah@example.com")).thenReturn(Optional.of(user));

        assertThatThrownBy(() -> authService.updateProfile("sarah@example.com", request))
                .isInstanceOf(ValidationException.class);
    }
}