const assert = require('assert')
const _ = require('lodash')
const _db = require('underscore-db')
const mixins = require('../../src/server/mixins')

describe('mixins', () => {
  let db

  before(() => {
    _.mixin(_db)
    _.mixin(mixins)
  })

  beforeEach(() => {
    db = {
      posts: [
        { id: 1, comment: 1 }
      ],
      comments: [
        { id: 1, postId: 1 },
        // Comments below references a post that doesn't exist
        { id: 2, postId: 2 },
        { id: 3, postId: 2 }
      ],
      photos: [
        { id: '1' },
        { id: '2' }
      ]
    }
  })

  describe('getRemovable', () => {
    it('should return removable documents', () => {
      const expected = [
        { name: 'comments', id: 2 },
        { name: 'comments', id: 3 }
      ]

      assert.deepEqual(_.getRemovable(db), expected)
    })
  })

  describe('createId', () => {
    it('should return a new id', () => {
      assert.equal(_.createId(db.comments), 4)
    })

    it('should return a new uuid', () => {
      assert.notEqual(_.createId(db.photos), 3)
    })
  })
})