package com.mydreamjob.notification;

import com.mydreamjob.common.exception.BusinessException;
import com.mydreamjob.common.exception.ErrorCode;
import com.mydreamjob.auth.UserRepository;
import com.mydreamjob.company.CompanyRepository;
import org.junit.jupiter.api.BeforeEach;
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.data.domain.PageImpl;
import org.springframework.data.domain.PageRequest;

import java.util.*;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.*;

@ExtendWith(MockitoExtension.class)
class NotificationServiceTest {

    @Mock private NotificationRepository notificationRepository;
    @Mock private PushProvider pushProvider;
    @Mock private UserRepository userRepository;
    @Mock private CompanyRepository companyRepository;
    @InjectMocks private NotificationService notificationService;

    private static final Long USER_A = 100L;
    private static final Long USER_B = 200L;
    private static final Long NOTIF_ID = 1L;
    private Notification notif;

    @BeforeEach
    void setUp() {
        notif = Notification.builder().id(NOTIF_ID).userId(USER_A)
                .type("APPLICATION").title("新投递").content("有新的投递").read(false).build();
    }

    @Test void create_shouldSaveAndPush() {
        when(notificationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
        when(pushProvider.send(eq(USER_A), any(), any())).thenReturn(true);

        Notification n = notificationService.create(USER_A, "APPLICATION", "新投递", "内容");

        assertEquals("新投递", n.getTitle());
        verify(pushProvider, times(1)).send(eq(USER_A), any(), any());
    }

    @Test void list_shouldReturnPaged() {
        when(notificationRepository.findByUserIdOrderByCreatedAtDesc(eq(USER_A), any()))
                .thenReturn(new PageImpl<>(List.of(notif)));

        var r = notificationService.list(USER_A, 0, 20);
        assertEquals(1, r.getTotalElements());
    }

    @Test void list_invalidSize_shouldReturn400() {
        assertThrows(BusinessException.class, () -> notificationService.list(USER_A, 0, 0));
        assertThrows(BusinessException.class, () -> notificationService.list(USER_A, -1, 20));
        assertThrows(BusinessException.class, () -> notificationService.list(USER_A, 0, 51));
    }

    @Test void markRead_shouldSucceed() {
        when(notificationRepository.findById(NOTIF_ID)).thenReturn(Optional.of(notif));
        when(notificationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));

        notificationService.markRead(USER_A, NOTIF_ID);
        assertTrue(notif.getRead());
    }

    @Test void markRead_alreadyRead_shouldBeIdempotent() {
        notif.setRead(true);
        when(notificationRepository.findById(NOTIF_ID)).thenReturn(Optional.of(notif));

        notificationService.markRead(USER_A, NOTIF_ID);
        verify(notificationRepository, never()).save(any());
    }

    @Test void markRead_otherUser_shouldReturn403() {
        when(notificationRepository.findById(NOTIF_ID)).thenReturn(Optional.of(notif));

        assertThrows(BusinessException.class, () -> notificationService.markRead(USER_B, NOTIF_ID));
    }

    @Test void markRead_notFound_shouldReturn404() {
        when(notificationRepository.findById(999L)).thenReturn(Optional.empty());

        BusinessException ex = assertThrows(BusinessException.class,
                () -> notificationService.markRead(USER_A, 999L));
        assertEquals(ErrorCode.NOTIFICATION_NOT_FOUND.getCode(), ex.getErrorCodeInt());
    }

    @Test void unreadCount_shouldReturnCount() {
        when(notificationRepository.countUnreadByUserId(USER_A)).thenReturn(5L);

        assertEquals(5L, notificationService.unreadCount(USER_A));
    }

    @Test void markAllRead_shouldMarkUnread() {
        notif.setRead(false);
        when(notificationRepository.findByUserIdOrderByCreatedAtDesc(eq(USER_A), any()))
                .thenReturn(new PageImpl<>(List.of(notif)));
        when(notificationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));

        int marked = notificationService.markAllRead(USER_A);
        assertEquals(1, marked);
        assertTrue(notif.getRead());
    }
}