/* eslint-env jest */
let NewD3 = function () {
  function returnThis () {
    return this
  }
  return {
    append: function () {
      return NewD3()
    },
    lower: returnThis,
    attr: returnThis,
    style: returnThis,
    text: returnThis,
    0: {
      0: {
        getBBox: function () {
          return {
            height: 10,
            width: 20
          }
        }
      }
    }
  }
}

export const select = function () {
  return new NewD3()
}

export const selectAll = function () {
  return new NewD3()
}

export const curveBasis = 'basis'
export const curveLinear = 'linear'
export const curveCardinal = 'cardinal'

export const MockD3 = (name, parent) => {
  const children = []
  const elem = {
    get __children () { return children },
    get __name () { return name },
    get __parent () { return parent }
  }
  elem.append = (name) => {
    const mockElem = MockD3(name, elem)
    children.push(mockElem)
    return mockElem
  }
  elem.lower = jest.fn(() => elem)
  elem.attr = jest.fn(() => elem)
  elem.text = jest.fn(() => elem)
  elem.style = jest.fn(() => elem)
  return elem
}