// @flow

import { handleActions } from 'redux-actions'

import type { Device, Devices } from 'types/common'

type stateType = {
  currentDevice: ?Device,
  devices: Devices,
}
const state = {
  currentDevice: null,
  devices: [],
}

const handlers: Object = {
  DEVICES_UPDATE: (state: stateType, { payload: devices }: { payload: Devices }) => ({
    ...state,
    devices,
  }),
  DEVICE_ADD: (state: stateType, { payload: device }: { payload: Device }) => ({
    ...state,
    devices: [...state.devices, device].filter(
      (v, i, s) => s.findIndex(t => t.path === v.path) === i,
    ),
  }),
  DEVICE_REMOVE: (state: stateType, { payload: device }: { payload: Device }) => ({
    ...state,
    devices: state.devices.filter(d => d.path !== device.path),
  }),
  DEVICE_CHOOSE: (state: stateType, { payload: currentDevice }: { payload: Device }) => ({
    ...state,
    currentDevice,
  }),
}

export function getCurrentDevice(state: Object) {
  return state.devices.currentDevice
}

export function getDevices(state: Object) {
  return state.devices.devices
}

export default handleActions(handlers, state)