const ls = window.localStorage
// https://github.com/tsironis/lockr
export default {getItem(key) {try {return JSON.parse(ls.getItem(key))} catch (err) {return null}},setItem(key, val) {ls.setItem(key, JSON.stringify(val))},clear() {ls.clear()},keys() {return ls.keys()},removeItem(key) {ls.removeItem(key)}
}

import LStorage from './LStorage'/*** 代理二级属性* @param {*} lsKey 存在localStorage的key* @param {*} pk    一级属性的key*/
function createHanlder(lsKey, pk) {return {set: function (target, key, value, receiver) {let item = LStorage.getItem(lsKey)if (item && item[pk]) {item[pk][key] = valueLStorage.setItem(lsKey, item)}return Reflect.set(target, key, value, receiver)}}
}/*** 仅仅存需要存放的数据* @param {*} source * @param {*} keys */
function copy(source, keys = []) {if (!source) {return source}let d = Object.create(null)keys.forEach(k => { d[k] = source[k] })return d
}/*** 代理state* @param {*} initState 初始化的值* @param {*} lsKey  localStorage的key* @param {*} keys   需要存储的键*/
const proxy = function (initState, lsKey, keys = []) {let ks = keys, obj = Object.assign({}, initState, LStorage.getItem(lsKey))// 代理二级属性keys.forEach(k => {obj[k] = new Proxy(obj[k], createHanlder(lsKey, k))})// 存入合并的值
  LStorage.setItem(lsKey, copy(obj, keys))return new Proxy(obj, {set: function (target, key, value, receiver) {ks.indexOf(key) >= 0 && LStorage.setItem(lsKey, copy(target, keys))return Reflect.set(target, key, value, receiver)}})
}export { proxy }

import { proxy } from '../utils/LSProxy'
let state = {list: [],current: null
}
state = proxy(state, 'playing', ['list'])const mutations = {/*** 添加歌曲* @param {*} state * @param {*} song 歌曲信息 */addSong(state, song) {let index = state.list.findIndex(s => s.songmid === song.songmid)if (index < 0) {state.list.push(song)}},/*** 添加歌曲* @param {*} state  内置* @param {*} songs  歌曲列表*/addSongs(state, songs) {let index = -1songs.forEach(song => {index = state.list.findIndex(s => s.songmid === song.songmid)if (index < 0) {state.list.push(song)}})},/*** 删除歌曲* @param {*} state * @param {*} songmid  歌曲媒体id */removeSong(state, songmid) {let index = state.list.findIndex(s => s.songmid === songmid)index >= 0 && state.list.splice(index, 1)},/*** 批量删除歌曲* @param {*} state * @param {*} songmids 歌曲媒体列表 */removeSongs(state, songmids = []) {let index = -1songmids.forEach(songmid => {index = state.list.findIndex(s => s.songmid === songmid)index >= 0 && state.list.splice(index, 1)})},/*** 播放下一首，* @param {*} state * @param {*} song 为空*/next(state, song) {// 如果song不为空，表示是插放，（前提是已经添加到playing）if (song) {let index = state.list.findIndex(s => s.songmid === song.songmid)if (index >= 0) {state.current = state.list[index]return}return}// 如果current为空，表示没有播放的歌曲if (!state.current && state.list && state.list.length > 0) {state.current = state.list[0]return}// 如果不是插放，并且current不为空if (!song && state.current) {// 播放的歌曲是不是在当前的列表let index = state.list.findIndex(s => s.songmid === state.current.songmid)// 如果在歌曲列表里面，接着播放下首if (index >= 0) {state.current = (index === state.list.length - 1 ? state.list[0] : state.list[index + 1])} else {state.current = state.list[0]}}}
}export default {namespaced: true,state,mutations
}