/*********** redux/api.js ***********/
class ReduxApi {
  constructor(appName, relativePath) {
    this.APP_NAME = appName;
    this.URL = `{relativePath}`

    this.GET_REQUEST = `${this.APP_NAME}/GET_REQUEST`;
    this.GET_SUCCESS = `${this.APP_NAME}/GET_SUCCESS`;
    this.GET_ERROR = `${this.APP_NAME}/GET_ERROR`;

    this.reducer = this.reducer.bind(this);
    this.selectGlobal = this.selectGlobal.bind(this);
    this.makeSelectBase = this.makeSelectBase.bind(this);
    this.saga = this.saga.bind(this);
    this.get = this.get.bind(this);
  }

  getRequest() {
    return {
      type: this.GET_REQUEST
    };
  }

  getSuccess(data) {
    return {
      type: this.GET_SUCCESS,
      data
    };
  }

  getError(data) {
    return {
      type: this.GET_ERROR,
      data
    };
  }

  getRequestReducerHandler(state, action) {
    return state
      .set('requesting', true);
  }

  getSuccessReducerHandler(state, action) {
    return state
      .set('requesting', false)
      .set('initialized', true)
      .set('list', action.data);
  }

  getErrorReducerHandler(state, action) {
    return state
      .set('error', action.error)
      .set('requesting', false);
  }

  /*
  *
  * NOT INCLUDING GET (detail), POST, PUT, DELETE or PATCH, for sake of berivity
  *
  */

  reducer(state = fromJS({ list: [],
    detail: {},
    requesting: false,
    initialized: false,
  }), action) {

    switch (action.type) {
      case this.GET_REQUEST: {
        return getRequestReducerHandler(state, action);
      }

      case this.GET_SUCCESS: {
        return getSuccessReducerHandler(state, action)
      }

      case this.GET_ERROR: {
        return getErrorReducerHandler(state, action)
      }

      default:
        return state;
    }
  }

  * get(action = {}) {
    try {
      // Call using the request helper
      const resp = yield Axios.get(action.url || this.URL);
      yield put(this.getSuccess(resp.data, action.append));
    } catch (err) {
      yield put(this.getError(err));
    }
  }

  // Saga
  * saga() {
    yield all([
      takeLatest(this.GET_REQUEST, this.get),
    ]);
  }

  // Selectors
  selectGlobal(state) {
    return state.get(this.APP_NAME);
  }

  /*
  * Key corresponds to the redux state keys e.g. list, detail, etc.
  */
  makeSelectBase = (key) => {
    return createSelector(
      this.selectGlobal,
      (globalState) => globalState.get(key)
    );
  }
}

export default ReduxApi;


/*********** redux/index.js ***********/
import { all } from 'redux-saga/effects';
import ReduxAPI from './api';

const user = new ReduxAPI('user', '/api/v1/user/');
const feed = new ReduxAPI('feed', '/api/v1/feed/');
const comment = new ReduxAPI('comment', '/api/v1/comment/');

export default {
  user: user.reducer,
  feed: board.feed,
  comment: dance.comment
};

export function* saga() {
  yield all([
    user.saga(),
    feed.saga(),
    comment.saga()
  ]);
}


/*********** container/component.js ***********/
import React from 'react';
import { createStructuredSelector } from 'reselect';
import { connect } from 'react-redux';

// App
import ReduxApi from 'containers/redux/api';
const user = new ReduxApi('user', '/api/v1/user/');
const feed = new ReduxAPI('feed', '/api/v1/feed/');


class Header extends React.Component {
  constructor(props) {
    super(props);
    this.props.getUser();
    this.props.getFeed();
  }

  render() {
    const { currentUser, currentFeed } = this.props;
    return (
      <div className={classes.root}>
        { currentUser && currentUser.username}
      { currentFeed && currentFeed.length}
      </div>
    );
  }
}

const mapDispatchToProps = (dispatch) => ({
  getUser: () => dispatch(user.getRequest()),
  getFeed: () => dispatch(feed.getRequest())
});

const mapStateToProps = createStructuredSelector({
  currentUser: user.makeSelectBase('list'),
  currentFeed: feed.makeSelectBase('list')
});

export default connect(
  mapStateToProps,
  mapDispatchToProps
)(Header));