import Immutable from 'seamless-immutable'

export const types = {
  ERROR_RECEIVED_ON_WS: 'ERROR/RECEIVED_ON_WS',
}

export const actions = {
  errorReceived: (error) => ({
    type: types.ERROR_RECEIVED_ON_WS,
    error
  }),
}

const initialState = Immutable.from({
  nextId: 0,
  history: []
})

export default (state = initialState, action) => {
  switch (action.type) {
    case types.ERROR_RECEIVED_ON_WS:
      let error = Object.assign({id: state.nextId, timestamp: new Date()}, action.error);
      let newState = state.set('nextId', state.nextId + 1)
      newState = addErrorToHistory(newState, error)
      return newState
    default:
      return state
  }
}

function addErrorToHistory(state, error) {
  return addToArray(state, 'history', error);
}

function addToArray(state, arrayKey, element) {
  return state.set(arrayKey, state[arrayKey].concat([ element ]));
}