player-project/src/reducers/index.js

import { jwtDecode } from '../App'

export function authReducer(state, { type, token }) {
    if (!state) {
        if (localStorage.authToken) {
            type = 'AUTH_LOGIN'
            token = localStorage.authToken
        } else {
            return {}
        }
    }
    if (type === 'AUTH_LOGIN') {
        let auth = jwtDecode(token)
        if (auth) {
            localStorage.authToken = token
            return { token, payload: auth }
        }
    }
    if (type === 'AUTH_LOGOUT') {
        localStorage.authToken = ''
        return {}
    }
    return state
}

export function promiseReducer(state = {}, { type, name, status, payload, error }) {
    if (type === 'PROMISE') {
        return {
            ...state,
            [name]: { status, payload: (state === 'PENDING' && state[name] && state[name].payload) || payload, error }
        }
    }
    return state
}

export function playerReducer(state, { type, track, playlist, duration, currentTime, volume, playlistIndex }) {
    if (!state || type === 'EJECT_TRACK') return {}
    if (type === 'PLAY_TRACK') return { ...state, 'isPlaying': true }
    if (type === 'PAUSE_TRACK') return { ...state, 'isPlaying': false }
    if (type === 'SET_CURRTIME') return { ...state, 'currentTime': currentTime }
    if (type === 'SET_DURATION') return { ...state, 'duration': duration }
    if (type === 'SET_VOLUME') return { ...state, 'volume': volume }
    if (type === 'SET_PLAYLIST')  return { ...state, 'playlist': playlist} 
    if (type === 'SET_INDEX')   return { ...state, 'playlistIndex': playlistIndex} 

    if (type === 'SET_TRACK') {
        return {
            isPlaying: false,
            track: track,
            playlist: playlist,
            duration: duration,
            currentTime: currentTime,
            volume: volume,
            playlistIndex: 
                playlist.constructor.name === 'Array'? playlist.indexOf(track) : playlist.tracks.indexOf(track)
        }
    }
    return state
}

export const localStoreReducer = (reducer, localStorageName) => {
    return (
        (state, action) => {
            let newState
            if (!state && localStorage.getItem(localStorageName)) {
                newState = JSON.parse(localStorage.getItem(localStorageName))
                console.log(newState)
            } else {
                newState = reducer(state, action)
                localStorage.setItem(localStorageName, JSON.stringify(newState))
            }
            return newState
        }
    )
}