const chai = require('chai')
const expect = chai.expect

const {
  encodeBrowseCursor,
  decodeBrowseCursor
} = require('../../../server/utils/queries/libraryBrowseCursor')

describe('libraryBrowseCursor', () => {
  it('round-trips a deterministic title cursor with id tie-breaker', () => {
    const encoded = encodeBrowseCursor({
      sortBy: 'media.metadata.title',
      desc: false,
      keys: ['titleIgnorePrefix', 'id'],
      values: ['Dune', 'item_42']
    })

    expect(decodeBrowseCursor(encoded)).to.deep.equal({
      sortBy: 'media.metadata.title',
      desc: false,
      keys: ['titleIgnorePrefix', 'id'],
      values: ['Dune', 'item_42']
    })
  })

  it('rejects a cursor without the full ordered key set', () => {
    expect(() => decodeBrowseCursor(encodeBrowseCursor({
      sortBy: 'media.metadata.title',
      desc: false,
      keys: ['titleIgnorePrefix', 'id'],
      values: ['Dune']
    }))).to.throw('full ordered key set')
  })

  it('rejects a cursor without the id tie-breaker', () => {
    expect(() => decodeBrowseCursor(encodeBrowseCursor({
      sortBy: 'media.metadata.title',
      desc: false,
      keys: ['titleIgnorePrefix'],
      values: ['Dune']
    }))).to.throw('tie-breaker')
  })
})