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const {EventEmitter} = require('events')
const semver = require('semver')
const extend = require('xtend')
const ObservableStore = require('obs-store')
const hardCodedNotices = require('../../notices/notices.js')
const uniqBy = require('lodash.uniqby')
module.exports = class NoticeController extends EventEmitter {
constructor (opts = {}) {
super()
this.noticePoller = null
this.firstVersion = opts.firstVersion
this.version = opts.version
const initState = extend({
noticesList: [],
}, opts.initState)
this.store = new ObservableStore(initState)
// setup memStore
this.memStore = new ObservableStore({})
this.store.subscribe(() => this._updateMemstore())
this._updateMemstore()
// pull in latest notices
this.updateNoticesList()
}
getNoticesList () {
return this.store.getState().noticesList
}
getUnreadNotices () {
const notices = this.getNoticesList()
return notices.filter((notice) => notice.read === false)
}
getNextUnreadNotice () {
const unreadNotices = this.getUnreadNotices()
return unreadNotices[0]
}
async setNoticesList (noticesList) {
this.store.updateState({ noticesList })
return true
}
markNoticeRead (noticeToMark, cb) {
cb = cb || function (err) { if (err) throw err }
try {
const notices = this.getNoticesList()
const index = notices.findIndex((currentNotice) => currentNotice.id === noticeToMark.id)
notices[index].read = true
notices[index].body = ''
this.setNoticesList(notices)
const latestNotice = this.getNextUnreadNotice()
cb(null, latestNotice)
} catch (err) {
cb(err)
}
}
async updateNoticesList () {
const newNotices = await this._retrieveNoticeData()
const oldNotices = this.getNoticesList()
const combinedNotices = this._mergeNotices(oldNotices, newNotices)
const filteredNotices = this._filterNotices(combinedNotices)
const result = this.setNoticesList(filteredNotices)
this._updateMemstore()
return result
}
_mergeNotices (oldNotices, newNotices) {
return uniqBy(oldNotices.concat(newNotices), 'id')
}
_filterNotices (notices) {
return notices.filter((newNotice) => {
if ('version' in newNotice) {
const satisfied = semver.satisfies(this.version, newNotice.version)
return satisfied
}
if ('firstVersion' in newNotice) {
const satisfied = semver.satisfies(this.firstVersion, newNotice.firstVersion)
return satisfied
}
return true
})
}
async _retrieveNoticeData () {
// Placeholder for remote notice API.
return hardCodedNotices
}
_updateMemstore () {
const nextUnreadNotice = this.getNextUnreadNotice()
const noActiveNotices = !nextUnreadNotice
this.memStore.updateState({ nextUnreadNotice, noActiveNotices })
}
}
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