import { describe, it, expect } from 'vitest';
import reducer, {
  addPosts,
  removePost,
  addToHashMap,
  upsertPosts,
  upsertPostsBeginning,
  populateFavorites,
  setCountNewPosts,
  BlogPost,
} from '@/state/features/blogSlice';

const post = (id: string, user = 'alice'): BlogPost => ({
  id,
  user,
  title: 't',
  description: 'd',
  createdAt: 0,
});

describe('blogSlice reducers', () => {
  it('addPosts replaces posts', () => {
    const s = reducer(undefined, addPosts([post('1')]));
    expect(s.posts.map((p) => p.id)).toEqual(['1']);
  });

  it('removePost removes by id from posts and filteredPosts', () => {
    const init = reducer(undefined, addPosts([post('1'), post('2')]));
    const withFiltered = { ...init, filteredPosts: [post('2'), post('3')] };
    const s = reducer(withFiltered, removePost('2'));
    expect(s.posts.map((p) => p.id)).toEqual(['1']);
    expect(s.filteredPosts.map((p) => p.id)).toEqual(['3']);
  });

  it('addToHashMap stores key as id-user', () => {
    const s = reducer(undefined, addToHashMap(post('1', 'bob')));
    expect(Object.keys(s.hashMapPosts)).toEqual(['1-bob']);
  });

  it('upsertPosts updates or inserts', () => {
    const a = reducer(undefined, addPosts([post('1'), post('2')]));
    const b = reducer(a, upsertPosts([post('2', 'x'), post('3')]));
    expect(b.posts.find((p) => p.id === '2')?.user).toBe('x');
    expect(b.posts.some((p) => p.id === '3')).toBe(true);
  });

  it('upsertPostsBeginning unshifts new and updates existing', () => {
    const a = reducer(undefined, addPosts([post('2')]));
    const b = reducer(a, upsertPostsBeginning([post('1'), post('2', 'y')]));
    expect(b.posts.map((p) => p.id)).toEqual(['1', '2']);
    expect(b.posts.find((p) => p.id === '2')?.user).toBe('y');
  });

  it('populateFavorites fills favorites without duplicates', () => {
    const a = reducer(undefined, populateFavorites([post('1')]));
    const b = reducer(a, populateFavorites([post('1'), post('2')]));
    expect(b.favorites.map((p) => p.id)).toEqual(['1', '2']);
  });

  it('setCountNewPosts sets counter', () => {
    const s = reducer(undefined, setCountNewPosts(5));
    expect(s.countNewPosts).toBe(5);
  });
});