import Immutable from 'immutable';

import * as types from '../constants/actionTypes';

export const sessions = (state = Immutable.List([]), action) => {

  switch (action.type) {

    case types.CREATE_SESSION:

      return state.push(action.session);

    case types.UPDATE_SESSION:

      const sessionToUpdate = state.find(session => session === action.session);

      const sessionIndex = state.indexOf(action.session);

      if (sessionIndex === -1) {

        return state;

      }

      const updatedSession = Object.assign({}, sessionToUpdate, action.values);

      return state.set(sessionIndex, updatedSession);

    case types.LOAD_SESSIONS:

      return action.sessions;

    default:

      return state;

  }

};