package de.fd.fh.server.access;

import com.mongodb.WriteResult;
import de.fd.fh.server.user.UserId;
import de.fd.fh.shared.network.messages.LoginRequest;
import de.fd.fh.shared.network.messages.RegistrateRequest;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.ArgumentCaptor;
import spark.HaltException;

import java.time.LocalDateTime;
import java.util.Base64;
import java.util.Observable;
import java.util.Observer;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.notNullValue;
import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.BDDMockito.then;
import static org.mockito.Mockito.*;

class AccessServiceTest implements Observer
{
    private Object event;

    @BeforeEach
    void before()
    {
        this.event = null;
    }

    @Test
    void given_authenticatedUser_when_serverAuthenticateUser_should_authenticateUser()
    {
        final Access access = new Access(
                "testId",
                "testName",
                "testPwd",
                UserId.of("12345"),
                new AccessToken(
                        "testToken",
                        LocalDateTime.now(),
                        Role.USER,
                        UserId.of("12345")
                ),
                Role.USER);

        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.findByToken(any()))
                .thenReturn(access);
        final String path = "/test/path";
        final String token = "testToken";

        final AccessToken result = new AccessService(repository).before(path, token);

        assertThat("User is not authenticated", result, notNullValue());
        then(repository).should().findByToken(any());
        then(repository).shouldHaveNoMoreInteractions();
    }

    @Test
    void given_notAuthenticatedUser_when_serverAuthenticateUser_should_denyUser()
    {
        final Access access = new Access(
                "testId",
                "testName",
                "testPwd",
                UserId.of("12345"),
                null,
                Role.USER);

        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.findByToken(any()))
                .thenReturn(access);
        final String path = "/test/path";
        final String token = "testToken";

        assertThrows(HaltException.class, () ->new AccessService(repository).before(path, token));

        then(repository).should().findByToken(any());
        then(repository).shouldHaveNoMoreInteractions();
    }

    @Test
    void given_newUser_when_createUser_should_storeNewUser()
    {
        final RegistrateRequest request =
                RegistrateRequest.of("testUser", "testPwd");

        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.findByUserName(any()))
                .thenReturn(null);
        ArgumentCaptor<Access> accessCaptor = ArgumentCaptor.forClass(Access.class);

        final AccessService service = new AccessService(repository);
        service.addObserver(this);

        final boolean result = service.createPlayer(request);

        assertTrue(result);
        assertThat("No event thrown", this.event, notNullValue());

        verify(repository).save(accessCaptor.capture());
        final Access createdAccess = accessCaptor.getValue();

        assertNotNull(createdAccess, "No Access created");
        assertNotNull(createdAccess.get_id(), "No Id created");
        assertNotNull(createdAccess.getUserId(), "No UserId created");
        assertEquals("testUser", createdAccess.getName(), "Wrong Username");
        assertEquals("testPwd", createdAccess.getPassword(), "Wrong Password");
        assertEquals(Role.USER.name(), createdAccess.getRole().name(), "Should be USER");
        assertNull(createdAccess.getToken(), "User should not be logged in");

        then(repository).should().findByUserName(any());
        then(repository).should().save(any(Access.class));
        then(repository).shouldHaveNoMoreInteractions();
    }

    @Test
    void given_loggedInUser_when_logout_should_logoutUser()
    {
        final Access access = new Access(
                "testId",
                "testName",
                "testPwd",
                UserId.of("12345"),
                null,
                Role.USER
        );
        final AccessToken token = AccessToken.of(access);
        access.setToken(token);

        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.findByToken(any()))
                .thenReturn(access);
        ArgumentCaptor<Access> accessCaptor = ArgumentCaptor.forClass(Access.class);

        final AccessService service = new AccessService(repository);

        final boolean result = service.logout("testToken");

        assertTrue(result);

        verify(repository).save(accessCaptor.capture());
        final Access createdAccess = accessCaptor.getValue();

        assertNotNull(createdAccess, "No Access created");
        assertNotNull(createdAccess.get_id(), "No Id created");
        assertNotNull(createdAccess.getUserId(), "No UserId created");
        assertEquals("testName", createdAccess.getName(), "Wrong Username");
        assertEquals("testPwd", createdAccess.getPassword(), "Wrong Password");
        assertEquals(Role.USER.name(), createdAccess.getRole().name(), "Should be USER");
        assertNull(createdAccess.getToken(), "User should logged out");

        then(repository).should().findByToken(any());
        then(repository).should().save(any(Access.class));
        then(repository).shouldHaveNoMoreInteractions();
    }

    @Test
    void given_storedUser_when_loginUser_should_returnLoginRequest()
    {
        final byte[] message = Base64.getEncoder().encode("testName:testPassword".getBytes());
        final String header = "Basic " + new String(message);
        final Access access = new Access(
                "testId",
                "testName",
                "testPassword",
                UserId.of("12345"),
                null,
                Role.USER
        );
        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.findByUserName(any()))
                .thenReturn(access);

        final LoginRequest result = new AccessService(repository).authorization(header);

        assertNotNull(result);
        assertEquals(result.getName(), "testName", "Wrong UserName");
        assertEquals(result.getUserId(), "12345", "Wrong Password");
        assertNotNull(result.getToken(), "Not logged in");
    }

    @Test
    void given_storedUserWithWrongPassword_when_loginUser_should_returnAccessDeny()
    {
        final byte[] message = Base64.getEncoder().encode("testName:testPassword".getBytes());
        final String header = "Basic " + new String(message);
        final AccessRepository repository = mock(AccessRepository.class);

        final LoginRequest result = new AccessService(repository).authorization(header);

        assertNull(result, "Return LoginRequest but wrong permissions");
    }

    @Test
    void given_storedUser_when_deleteUser_should_deleteUser()
    {
        final UserId userId = UserId.of("12345");
        final AccessToken token = new AccessToken(null, null, null, UserId.of("12345"));
        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.deleteLoginByUserId(any(UserId.class)))
                .thenReturn(new WriteResult(1, false, null));

        final AccessService service = new AccessService(repository);
        service.addObserver(this);

        final boolean result = service.deleteAccount(userId, token);

        assertTrue(result);
        assertNotNull(event);

        then(repository).should().deleteLoginByUserId(any(UserId.class));
        then(repository).shouldHaveNoMoreInteractions();
    }

    @Test
    void given_storedUser_when_deleteUserWithWrongPermission_should_doNothing()
    {
        final UserId userId = UserId.of("12345");
        final AccessToken token = new AccessToken(null, null, null, UserId.of("98765"));
        final AccessRepository repository = mock(AccessRepository.class);
        when(repository.deleteLoginByUserId(any(UserId.class)))
                .thenReturn(new WriteResult(1, false, null));

        final AccessService service = new AccessService(repository);
        service.addObserver(this);

        final boolean result = service.deleteAccount(userId, token);

        assertFalse(result);
        assertNull(event);

        then(repository).shouldHaveNoInteractions();
    }

    @Override
    public void update(Observable o, Object arg)
    {
        this.event = arg;
    }
}