import { beforeEach, describe, expect, it, vi } from 'vitest';
import type { ICommentRepository } from '../../../domain/repositories/comment.repository.interface.js';
import type { IIssueRepository } from '../../../../issue/domain/repositories/issue.repository.interface.js';
import { CommentNotFoundException } from '../../../domain/exceptions/comment-not-found.exception.js';
import { CommentForbiddenException } from '../../../domain/exceptions/comment-forbidden.exception.js';
import { CommentEventsService } from '../../services/comment-events.service.js';
import { CommentAccessService } from '../../services/comment-access.service.js';
import { UpdateCommentUseCase } from './update-comment.use-case.js';
import { UpdateCommentCommand } from './update-comment.command.js';
import {
  buildComment,
  buildIssue,
  mockCommentExpander,
  mockCommentRepository,
  mockFileAccess,
  mockIssueRepository,
} from '../test-helpers.js';
import { FileNotFoundException } from '../../../../file/domain/exceptions/file-not-found.exception.js';
import type { FileAccessService } from '../../../../file/application/services/file-access.service.js';

describe('UpdateCommentUseCase', () => {
  let commentRepository: ICommentRepository;
  let issueRepository: IIssueRepository;
  let commentEventsService: CommentEventsService;
  let useCase: UpdateCommentUseCase;
  let received: unknown[];
  let fileAccess: FileAccessService;

  beforeEach(() => {
    commentRepository = mockCommentRepository();
    issueRepository = mockIssueRepository();
    commentEventsService = new CommentEventsService();
    fileAccess = mockFileAccess({ gone: new FileNotFoundException('gone') });
    useCase = new UpdateCommentUseCase(
      commentRepository,
      new CommentAccessService(commentRepository, issueRepository),
      mockCommentExpander(),
      commentEventsService,
      fileAccess,
    );
    received = [];
    commentEventsService.onEvents().subscribe((event) => received.push(event));
    vi.mocked(issueRepository.findById).mockResolvedValue(buildIssue());
  });

  it('updates the content and emits comment.updated', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment());

    const dto = await useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Changed'));

    expect(dto.content).toBe('Changed');
    expect(dto.editedAt).toBeInstanceOf(Date);
    expect(commentRepository.update).toHaveBeenCalledTimes(1);
    expect(received).toEqual([{ type: 'comment.updated', comment: dto }]);
  });

  it('skips saving and events when content did not change', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment());

    await useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Original'));

    expect(commentRepository.update).not.toHaveBeenCalled();
    expect(received).toEqual([]);
  });

  it('throws CommentForbiddenException for a non-author', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment());

    await expect(useCase.execute(new UpdateCommentCommand('comment-1', 'user-2', 'Changed'))).rejects.toThrow(
      CommentForbiddenException,
    );
    expect(commentRepository.update).not.toHaveBeenCalled();
  });

  it('throws CommentNotFoundException for a deleted comment', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment({ deletedAt: new Date() }));

    await expect(useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Changed'))).rejects.toThrow(
      CommentNotFoundException,
    );
  });

  it('throws CommentNotFoundException when the issue is not visible to the user', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment());
    vi.mocked(issueRepository.findById).mockResolvedValue(null);

    await expect(useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Changed'))).rejects.toThrow(
      CommentNotFoundException,
    );
  });

  it('replaces attachments, checking only newly added files', async () => {
    const comment = buildComment();
    comment.edit('Original', 'user-1', ['kept', 'removed']);
    vi.mocked(commentRepository.findById).mockResolvedValue(comment);

    await useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Original', ['kept', 'new']));

    expect(fileAccess.getAttachableFile).toHaveBeenCalledExactlyOnceWith('new', 'user-1');
    expect(vi.mocked(commentRepository.update).mock.calls[0]![0].fileIds).toEqual(['kept', 'new']);
    expect(received).toHaveLength(1);
  });

  it('does not save when an added file is gone', async () => {
    vi.mocked(commentRepository.findById).mockResolvedValue(buildComment());

    await expect(
      useCase.execute(new UpdateCommentCommand('comment-1', 'user-1', 'Original', ['gone'])),
    ).rejects.toThrow(FileNotFoundException);
    expect(commentRepository.update).not.toHaveBeenCalled();
  });
});