import { combineReducers } from 'redux'

const liveInitialState = {
  loading: false,
  error: null,
  opt: {},
  checkpoints: [],
  datasets: [],
}

const liveReducer = (state = liveInitialState, action) => {
  let results;

  switch(action.type) {
    case 'LOAD_PARAMS':
      if (! action.opt || ! Object.keys(action.opt).length) {
        return state
      }
      return {
        ...state,
        loading: false,
        error: null,
        opt: action.opt,
      }

    case 'SET_PARAM':
      return {
        ...state,
        opt: {
          ...state.opt,
          [action.key]: action.value,
        }
      }

    case 'LIST_CHECKPOINTS':
      return {
        ...state,
        checkpoints: action.checkpoints,
      }

    case 'LIST_DATASETS':
      return {
        ...state,
        datasets: action.datasets,
      }

    default:
      return state
  }
}

export default liveReducer