1 files changed, 135 insertions, 0 deletions
diff --git a/src/modules/announcements.js b/src/modules/announcements.js
new file mode 100644
index 00000000..e4d2d2b0
--- /dev/null
+++ b/src/modules/announcements.js
@@ -0,0 +1,135 @@
+const FETCH_ANNOUNCEMENT_INTERVAL_MS = 1000 * 60 * 5
+
+export const defaultState = {
+  announcements: [],
+  supportsAnnouncements: true,
+  fetchAnnouncementsTimer: undefined
+}
+
+export const mutations = {
+  setAnnouncements (state, announcements) {
+    state.announcements = announcements
+  },
+  setAnnouncementRead (state, { id, read }) {
+    const index = state.announcements.findIndex(a => a.id === id)
+
+    if (index < 0) {
+      return
+    }
+
+    state.announcements[index].read = read
+  },
+  setFetchAnnouncementsTimer (state, timer) {
+    state.fetchAnnouncementsTimer = timer
+  },
+  setSupportsAnnouncements (state, supportsAnnouncements) {
+    state.supportsAnnouncements = supportsAnnouncements
+  }
+}
+
+export const getters = {
+  unreadAnnouncementCount (state, _getters, rootState) {
+    if (!rootState.users.currentUser) {
+      return 0
+    }
+
+    const unread = state.announcements.filter(announcement => !(announcement.inactive || announcement.read))
+    return unread.length
+  }
+}
+
+const announcements = {
+  state: defaultState,
+  mutations,
+  getters,
+  actions: {
+    fetchAnnouncements (store) {
+      if (!store.state.supportsAnnouncements) {
+        return Promise.resolve()
+      }
+
+      const currentUser = store.rootState.users.currentUser
+      const isAdmin = currentUser && currentUser.role === 'admin'
+
+      const getAnnouncements = async () => {
+        if (!isAdmin) {
+          return store.rootState.api.backendInteractor.fetchAnnouncements()
+        }
+
+        const all = await store.rootState.api.backendInteractor.adminFetchAnnouncements()
+        const visible = await store.rootState.api.backendInteractor.fetchAnnouncements()
+        const visibleObject = visible.reduce((a, c) => {
+          a[c.id] = c
+          return a
+        }, {})
+        const getWithinVisible = announcement => visibleObject[announcement.id]
+
+        all.forEach(announcement => {
+          const visibleAnnouncement = getWithinVisible(announcement)
+          if (!visibleAnnouncement) {
+            announcement.inactive = true
+          } else {
+            announcement.read = visibleAnnouncement.read
+          }
+        })
+
+        return all
+      }
+
+      return getAnnouncements()
+        .then(announcements => {
+          store.commit('setAnnouncements', announcements)
+        })
+        .catch(error => {
+          // If and only if backend does not support announcements, it would return 404.
+          // In this case, silently ignores it.
+          if (error && error.statusCode === 404) {
+            store.commit('setSupportsAnnouncements', false)
+          } else {
+            throw error
+          }
+        })
+    },
+    markAnnouncementAsRead (store, id) {
+      return store.rootState.api.backendInteractor.dismissAnnouncement({ id })
+        .then(() => {
+          store.commit('setAnnouncementRead', { id, read: true })
+        })
+    },
+    startFetchingAnnouncements (store) {
+      if (store.state.fetchAnnouncementsTimer) {
+        return
+      }
+
+      const interval = setInterval(() => store.dispatch('fetchAnnouncements'), FETCH_ANNOUNCEMENT_INTERVAL_MS)
+      store.commit('setFetchAnnouncementsTimer', interval)
+
+      return store.dispatch('fetchAnnouncements')
+    },
+    stopFetchingAnnouncements (store) {
+      const interval = store.state.fetchAnnouncementsTimer
+      store.commit('setFetchAnnouncementsTimer', undefined)
+      clearInterval(interval)
+    },
+    postAnnouncement (store, { content, startsAt, endsAt, allDay }) {
+      return store.rootState.api.backendInteractor.postAnnouncement({ content, startsAt, endsAt, allDay })
+        .then(() => {
+          return store.dispatch('fetchAnnouncements')
+        })
+    },
+    editAnnouncement (store, { id, content, startsAt, endsAt, allDay }) {
+      return store.rootState.api.backendInteractor.editAnnouncement({ id, content, startsAt, endsAt, allDay })
+        .then(() => {
+          return store.dispatch('fetchAnnouncements')
+        })
+    },
+    deleteAnnouncement (store, id) {
+      return store.rootState.api.backendInteractor.deleteAnnouncement({ id })
+        .then(() => {
+          return store.dispatch('fetchAnnouncements')
+        })
+    }
+  }
+}
+
+export default announcements