import { describe, expect, it } from 'vitest';
import { Comment } from './comment.entity.js';
import { CommentForbiddenException } from '../exceptions/comment-forbidden.exception.js';

const buildComment = (overrides: Partial<{ authorId: string | null; deletedAt: Date | null }> = {}) =>
  Comment.reconstitute({
    id: 'comment-1',
    content: 'Original',
    issueId: 1,
    authorId: overrides.authorId === undefined ? 'user-1' : overrides.authorId,
    editedAt: null,
    deletedAt: overrides.deletedAt ?? null,
    createdAt: new Date('2026-01-01T00:00:00.000Z'),
    updatedAt: new Date('2026-01-01T00:00:00.000Z'),
  });

describe('Comment', () => {
  describe('create', () => {
    it('creates a new comment without id and edit/delete marks', () => {
      const comment = Comment.create({ issueId: 1, authorId: 'user-1', content: ' Hello ' });

      expect(comment.id).toBeNull();
      expect(comment.content).toBe('Hello');
      expect(comment.editedAt).toBeNull();
      expect(comment.isDeleted).toBe(false);
    });

    it('rejects empty content', () => {
      expect(() => Comment.create({ issueId: 1, authorId: 'user-1', content: '' })).toThrow();
    });
  });

  describe('edit', () => {
    it('changes content and sets editedAt', () => {
      const comment = buildComment();

      expect(comment.edit('Changed', 'user-1')).toBe(true);
      expect(comment.content).toBe('Changed');
      expect(comment.editedAt).toBeInstanceOf(Date);
    });

    it('is a no-op when content is the same', () => {
      const comment = buildComment();

      expect(comment.edit(' Original ', 'user-1')).toBe(false);
      expect(comment.editedAt).toBeNull();
    });

    it('forbids editing by someone other than the author', () => {
      expect(() => buildComment().edit('Changed', 'user-2')).toThrow(CommentForbiddenException);
    });

    it('forbids editing when the author account is deleted', () => {
      expect(() => buildComment({ authorId: null }).edit('Changed', 'user-1')).toThrow(CommentForbiddenException);
    });

    it('forbids editing a deleted comment', () => {
      expect(() => buildComment({ deletedAt: new Date() }).edit('Changed', 'user-1')).toThrow();
    });
  });

  describe('delete', () => {
    it('soft-deletes the comment', () => {
      const comment = buildComment();

      comment.delete('user-1');

      expect(comment.isDeleted).toBe(true);
      expect(comment.deletedAt).toBeInstanceOf(Date);
    });

    it('forbids deletion by someone other than the author', () => {
      expect(() => buildComment().delete('user-2')).toThrow(CommentForbiddenException);
    });
  });

  describe('attachments', () => {
    it('creates a comment with deduplicated files', () => {
      const comment = Comment.create({ issueId: 1, authorId: 'user-1', content: 'Hi', fileIds: ['a', 'b', 'a'] });

      expect(comment.fileIds).toEqual(['a', 'b']);
    });

    it('limits the number of files', () => {
      const fileIds = Array.from({ length: Comment.MAX_ATTACHMENTS + 1 }, (_, i) => `f${i}`);

      expect(() => Comment.create({ issueId: 1, authorId: 'user-1', content: 'Hi', fileIds })).toThrow();
    });

    it('treats a changed file set as an edit, even with the same text', () => {
      const comment = buildComment();

      expect(comment.edit('Original', 'user-1', ['a'])).toBe(true);
      expect(comment.fileIds).toEqual(['a']);
      expect(comment.editedAt).toBeInstanceOf(Date);
    });

    it('keeps files when fileIds is not passed', () => {
      const comment = buildComment();
      comment.edit('Original', 'user-1', ['a']);

      expect(comment.edit('Changed', 'user-1')).toBe(true);
      expect(comment.fileIds).toEqual(['a']);
    });

    it('reports no change for the same text and files', () => {
      const comment = buildComment();
      comment.edit('Original', 'user-1', ['a', 'b']);

      expect(comment.edit('Original', 'user-1', ['a', 'b'])).toBe(false);
    });

    it('drops files on delete so GC can collect them', () => {
      const comment = buildComment();
      comment.edit('Original', 'user-1', ['a']);

      comment.delete('user-1');

      expect(comment.fileIds).toEqual([]);
    });
  });
});