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const EventEmitter = require('events').EventEmitter
const extend = require('xtend')
const ObservableStore = require('obs-store')
const hardCodedNotices = require('../../notices/notices.json')
module.exports = class NoticeController extends EventEmitter {
constructor (opts) {
super()
this.noticePoller = null
const initState = extend({
noticesList: [],
}, opts.initState)
this.store = new ObservableStore(initState)
this.memStore = new ObservableStore({})
this.store.subscribe(() => this._updateMemstore())
}
getNoticesList () {
return this.store.getState().noticesList
}
getUnreadNotices () {
const notices = this.getNoticesList()
return notices.filter((notice) => notice.read === false)
}
getLatestUnreadNotice () {
const unreadNotices = this.getUnreadNotices()
return unreadNotices[unreadNotices.length - 1]
}
setNoticesList (noticesList) {
this.store.updateState({ noticesList })
return Promise.resolve(true)
}
markNoticeRead (noticeToMark, cb) {
cb = cb || function (err) { if (err) throw err }
try {
var notices = this.getNoticesList()
var index = notices.findIndex((currentNotice) => currentNotice.id === noticeToMark.id)
notices[index].read = true
notices[index].body = ''
this.setNoticesList(notices)
const latestNotice = this.getLatestUnreadNotice()
cb(null, latestNotice)
} catch (err) {
cb(err)
}
}
updateNoticesList () {
return this._retrieveNoticeData().then((newNotices) => {
var oldNotices = this.getNoticesList()
var combinedNotices = this._mergeNotices(oldNotices, newNotices)
return Promise.resolve(this.setNoticesList(combinedNotices))
})
}
startPolling () {
if (this.noticePoller) {
clearInterval(this.noticePoller)
}
this.noticePoller = setInterval(() => {
this.noticeController.updateNoticesList()
}, 300000)
}
_mergeNotices (oldNotices, newNotices) {
var noticeMap = this._mapNoticeIds(oldNotices)
newNotices.forEach((notice) => {
if (noticeMap.indexOf(notice.id) === -1) {
oldNotices.push(notice)
}
})
return oldNotices
}
_mapNoticeIds (notices) {
return notices.map((notice) => notice.id)
}
_retrieveNoticeData () {
// Placeholder for the API.
return Promise.resolve(hardCodedNotices)
}
_updateMemstore () {
const lastUnreadNotice = this.getLatestUnreadNotice()
const noActiveNotices = !lastUnreadNotice
this.memStore.updateState({ lastUnreadNotice, noActiveNotices })
}
}
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