import { spy } from 'eltro'

const indexMap = [
  'firstCall',
  'secondCall',
  'thirdCall',
]

export function fakeHttp(inj1, inj2) {
  let intermediate = {
    createServer: function(cb) {
      if (inj1) inj1(cb)
      intermediate.fakeRequest = cb
      return {
        listen: function(port, ip, cb) {
          if (inj2) inj2(port, ip, cb)
          else if (cb) cb()
        }
      }
    }
  }
  return intermediate
}

export function createReq(def) {
  return defaults(def, {
    on: spy(),
  })
}

export function createRes(def) {
  return defaults(def, {
    statusCode: 0,
    end: spy(),
    setHeader: spy(),
    write: spy(),
    on: spy(),
    writeHead: spy(),
    pipe: spy(),
  })
}

export function createCtx(def, endHandler) {
  return defaults(def, {
    req: createReq(),
    res: createRes({ end: endHandler || spy() }),
    finished: false,
    method: 'GET',
    url: '/test',
    search: '',
    state: {},
    status: 200,
    body: null,
    type: null,
    length: null,
    log: {
      error: spy(),
      info: spy(),
      warn: spy(),
      debug: spy(),
    }
  })
}

// taken from isobject npm library
function isObject(val) {
  return val != null && typeof val === 'object' && Array.isArray(val) === false
}

export function defaults(options, def) {
  let out = { }

  if (options) {
    Object.keys(options || {}).forEach(key => {
      out[key] = options[key]

      if (Array.isArray(out[key])) {
        out[key] = out[key].map(item => {
          if (isObject(item)) return defaults(item)
          return item
        })
      } else if (out[key] && typeof out[key] === 'object') {
        out[key] = defaults(options[key], def && def[key])
      }
    })
  }

  if (def) {
    Object.keys(def).forEach(function(key) {
      if (typeof out[key] === 'undefined') {
        out[key] = def[key]
      }
    })
  }

  return out
}