flashcards/src/repositories/mongo-card-repository.test.ts

// @vitest-environment node
import { describe, expect, it, vi } from 'vitest'
import type { Collection } from 'mongodb'
import { MongoCardRepository, type CardDocument } from './mongo-card-repository'

const DOC = {
  c_id: '10000000-0000-4000-8000-000000000001',
  question: "Qu'est-ce qu'une closure ?",
  response: 'Une fonction qui conserve la portée de sa définition.',
  theme: 'javascript',
  tags: ['scope'],
  createdAt: new Date('2026-01-01T08:00:00Z'),
  updatedAt: new Date('2026-01-02T09:00:00Z'),
}

interface CollectionMock {
  find: ReturnType<typeof vi.fn>
  findOne: ReturnType<typeof vi.fn>
  insertOne: ReturnType<typeof vi.fn>
  updateOne: ReturnType<typeof vi.fn>
  deleteOne: ReturnType<typeof vi.fn>
  aggregate: ReturnType<typeof vi.fn>
  distinct: ReturnType<typeof vi.fn>
}

function cursorOf(docs: unknown[]) {
  return { toArray: vi.fn().mockResolvedValue(docs) }
}

function setup() {
  const collection: CollectionMock = {
    find: vi.fn(),
    findOne: vi.fn(),
    insertOne: vi.fn(),
    updateOne: vi.fn(),
    deleteOne: vi.fn(),
    aggregate: vi.fn(),
    distinct: vi.fn(),
  }
  const repo = new MongoCardRepository(collection as unknown as Collection<CardDocument>)
  return { repo, collection }
}

describe('MongoCardRepository', () => {
  it('findAll renvoie toutes les cartes mappées', async () => {
    const { repo, collection } = setup()
    collection.find.mockReturnValue(cursorOf([DOC]))
    const cards = await repo.findAll()
    expect(cards).toHaveLength(1)
    expect(cards[0].id).toBe(DOC.c_id)
    expect(cards[0].tags).toEqual(['scope'])
  })

  it('findAll renvoie un tableau vide si aucune carte', async () => {
    const { repo, collection } = setup()
    collection.find.mockReturnValue(cursorOf([]))
    await expect(repo.findAll()).resolves.toEqual([])
  })

  it('findById renvoie la carte ou null', async () => {
    const { repo, collection } = setup()
    collection.findOne.mockResolvedValueOnce(DOC)
    const card = await repo.findById(DOC.c_id)
    expect(card?.id).toBe(DOC.c_id)
    expect(collection.findOne).toHaveBeenCalledWith({ c_id: DOC.c_id }, expect.anything())
    collection.findOne.mockResolvedValueOnce(null)
    await expect(repo.findById('inconnu')).resolves.toBeNull()
  })

  it('create insère un document avec c_id et renvoie l entité', async () => {
    const { repo, collection } = setup()
    collection.insertOne.mockResolvedValueOnce({ insertedId: '' })
    const card = await repo.create({
      question: 'Que retourne typeof null ?',
      response: 'object',
      theme: 'javascript',
    })
    const [doc] = collection.insertOne.mock.calls[0] as unknown[]
    const inserted = doc as Record<string, unknown>
    expect(inserted.c_id).toBe(card.id)
    expect(inserted.tags).toEqual([])
    expect(card.tags).toEqual([])
    expect(card.createdAt).toBeInstanceOf(Date)
  })

  it('update modifie les champs fournis et renvoie la carte', async () => {
    const { repo, collection } = setup()
    collection.updateOne.mockResolvedValueOnce({ matchedCount: 1 })
    collection.findOne.mockResolvedValueOnce({ ...DOC, response: 'Nouvelle' })
    const card = await repo.update(DOC.c_id, { response: 'Nouvelle' })
    expect(card?.response).toBe('Nouvelle')
    const [filter, set] = collection.updateOne.mock.calls[0] as unknown[]
    const setDoc = set as Record<string, { response?: string; updatedAt?: Date }>
    expect(filter).toEqual({ c_id: DOC.c_id })
    expect(setDoc.$set.response).toBe('Nouvelle')
    expect(setDoc.$set.updatedAt).toBeInstanceOf(Date)
  })

  it('update renvoie null si aucune carte ne correspond', async () => {
    const { repo, collection } = setup()
    collection.updateOne.mockResolvedValueOnce({ matchedCount: 0 })
    await expect(repo.update('inconnu', { question: 'X' })).resolves.toBeNull()
  })

  it('delete renvoie true si un document est supprimé', async () => {
    const { repo, collection } = setup()
    collection.deleteOne.mockResolvedValueOnce({ deletedCount: 1 })
    await expect(repo.delete(DOC.c_id)).resolves.toBe(true)
    expect(collection.deleteOne).toHaveBeenCalledWith({ c_id: DOC.c_id })
  })

  it('delete renvoie false si aucun document ne correspond', async () => {
    const { repo, collection } = setup()
    collection.deleteOne.mockResolvedValueOnce({ deletedCount: 0 })
    await expect(repo.delete('inconnu')).resolves.toBe(false)
  })

  it('findRandom renvoie une carte au hasard ou null', async () => {
    const { repo, collection } = setup()
    collection.aggregate.mockReturnValueOnce(cursorOf([DOC]))
    const card = await repo.findRandom()
    expect(card?.id).toBe(DOC.c_id)
    expect(collection.aggregate.mock.calls[0][0]).toContainEqual({ $sample: { size: 1 } })
    collection.aggregate.mockReturnValueOnce(cursorOf([]))
    await expect(repo.findRandom()).resolves.toBeNull()
  })

  it('findRandomByTheme filtre par thème', async () => {
    const { repo, collection } = setup()
    collection.aggregate.mockReturnValueOnce(cursorOf([DOC]))
    const card = await repo.findRandomByTheme('javascript')
    expect(card?.id).toBe(DOC.c_id)
    const stages = collection.aggregate.mock.calls[0][0] as unknown[]
    expect(stages[0]).toEqual({ $match: { theme: 'javascript' } })
    collection.aggregate.mockReturnValueOnce(cursorOf([]))
    await expect(repo.findRandomByTheme('react')).resolves.toBeNull()
  })

  it('findThemes renvoie les thèmes distincts triés', async () => {
    const { repo, collection } = setup()
    collection.distinct.mockResolvedValueOnce(['react', 'docker'])
    await expect(repo.findThemes()).resolves.toEqual(['docker', 'react'])
  })
})