const state = lore.store.getState();
const tweet = state.tweet.byId[1];

import _ from 'lodash';

/*
 * addOrUpdateById()
 *
 * Insert a model into this reducer's state, or update the data for
 * that model if it's already exists in state.
 */

function addOrUpdateById(nextState, payload) {
  const id = payload && payload.id;
  let existingModel = null;

  if (id) {
    existingModel = nextState[id];
    if (existingModel) {
      nextState[id] = _.assign({}, payload, {
        cid: existingModel.cid
      });
    } else {
      nextState[id] = payload;
    }
  }
  return nextState;
}

/*
 * removeById()
 *
 * Remove a model from this reducer's state.
 */

function removeById(nextState, payload) {
  const id = payload && payload.id;
  if (id) {
    delete nextState[id];
  }
  return nextState;
}

export default function(modelName) {
  return function byId(state, action) {
    state = state || {};
    const nextState = _.assign({}, state);

    switch (action.type) {
      case 'ADD_TWEET:
        return addOrUpdateById(nextState, action.payload);

      case 'UPDATE_TWEET:
        return addOrUpdateById(nextState, action.payload);

      case 'REMOVE_TWEET:
        return removeById(nextState, action.payload);

      case 'FETCH_TWEETS:
        action.payload.data.forEach(function(datum) {
          addOrUpdateById(nextState, datum);
        });
        return nextState;

      default:
        return nextState;
    }
  };
}