import {
  User,
  UserAttributes,
  ReduxAction,
  REGISTRATION_REQUEST_SENT,
  REGISTRATION_REQUEST_SUCCEEDED,
  REGISTRATION_REQUEST_FAILED,
  REGISTRATION_UPDATE_REQUEST_SENT,
  REGISTRATION_UPDATE_REQUEST_SUCCEEDED,
  REGISTRATION_UPDATE_REQUEST_FAILED,
  VERIFY_TOKEN_REQUEST_SENT,
  VERIFY_TOKEN_REQUEST_SUCCEEDED,
  VERIFY_TOKEN_REQUEST_FAILED,
  SIGNIN_REQUEST_SENT,
  SIGNIN_REQUEST_SUCCEEDED,
  SIGNIN_REQUEST_FAILED,
  SIGNOUT_REQUEST_SENT,
  SIGNOUT_REQUEST_SUCCEEDED,
  SIGNOUT_REQUEST_FAILED,
  SET_HAS_VERIFICATION_BEEN_ATTEMPTED
} from '../../types'
import initialState from '../../initial-state'

const { currentUser: initialUser } = initialState

const currentUser = (state: User = initialUser, action: ReduxAction): User => {
  switch (action.type) {
    case REGISTRATION_REQUEST_SENT:
    case REGISTRATION_UPDATE_REQUEST_SENT:
    case VERIFY_TOKEN_REQUEST_SENT:
    case SIGNIN_REQUEST_SENT:
    case SIGNOUT_REQUEST_SENT:
      return {
        ...state,
        isLoading: true
      }
    case VERIFY_TOKEN_REQUEST_SUCCEEDED:
      return {
        ...state,
        attributes: { ...action.payload.userAttributes },
        isLoading: false,
        isSignedIn: true,
        hasVerificationBeenAttempted: true
      }
    case REGISTRATION_REQUEST_SUCCEEDED:
    case REGISTRATION_UPDATE_REQUEST_SUCCEEDED:
    case SIGNIN_REQUEST_SUCCEEDED:
      return {
        ...state,
        attributes: { ...action.payload.userAttributes },
        isLoading: false,
        isSignedIn: true
      }
    case VERIFY_TOKEN_REQUEST_FAILED:
      return {
        ...state,
        isLoading: false,
        isSignedIn: false,
        hasVerificationBeenAttempted: true
      }
    case REGISTRATION_REQUEST_FAILED:
    case REGISTRATION_UPDATE_REQUEST_FAILED:
    case SIGNIN_REQUEST_FAILED:
      return {
        ...state,
        isLoading: false,
        isSignedIn: false
      }
    case SIGNOUT_REQUEST_SUCCEEDED:
      const userAttributeKeys: string[] = Object.keys(state.attributes)
      const allNullUserAttributes: UserAttributes = userAttributeKeys.reduce(
        (
          accumulatedNullUserAttributes: UserAttributes,
          currentUserAttributeKey: string
        ): UserAttributes => {
          return {
            ...accumulatedNullUserAttributes,
            [currentUserAttributeKey]: null
          }
        },
        {}
      )
      return {
        ...state,
        attributes: allNullUserAttributes,
        isLoading: false,
        isSignedIn: false
      }
    case SIGNOUT_REQUEST_FAILED:
      return {
        ...state,
        isLoading: false
      }
    case SET_HAS_VERIFICATION_BEEN_ATTEMPTED:
      return {
        ...state,
        hasVerificationBeenAttempted:
          action.payload.hasVerificationBeenAttempted
      }
    default:
      return state
  }
}

export default currentUser