import Notification from '../notification/notification.vue'
import notificationsFetcher from '../../services/notifications_fetcher/notifications_fetcher.service.js'
import {
  notificationsFromStore,
  visibleNotificationsFromStore,
  unseenNotificationsFromStore
} from '../../services/notification_utils/notification_utils.js'

const Notifications = {
  props: {
    // Disables display of panel header
    noHeading: Boolean,
    // Disables panel styles, unread mark, potentially other notification-related actions
    // meant for "Interactions" timeline
    minimalMode: Boolean,
    // Custom filter mode, an array of strings, possible values 'mention', 'repeat', 'like', 'follow', used to override global filter for use in "Interactions" timeline
    filterMode: Array
  },
  data () {
    return {
      bottomedOut: false
    }
  },
  computed: {
    mainClass () {
      return this.minimalMode ? '' : 'panel panel-default'
    },
    notifications () {
      return notificationsFromStore(this.$store)
    },
    error () {
      return this.$store.state.statuses.notifications.error
    },
    unseenNotifications () {
      return unseenNotificationsFromStore(this.$store)
    },
    visibleNotifications () {
      return visibleNotificationsFromStore(this.$store, this.filterMode)
    },
    unseenCount () {
      return this.unseenNotifications.length
    },
    loading () {
      return this.$store.state.statuses.notifications.loading
    }
  },
  components: {
    Notification
  },
  created () {
    const { dispatch } = this.$store

    dispatch('fetchAndUpdateNotifications')
  },
  watch: {
    unseenCount (count) {
      if (count > 0) {
        this.$store.dispatch('setPageTitle', `(${count})`)
      } else {
        this.$store.dispatch('setPageTitle', '')
      }
    }
  },
  methods: {
    markAsSeen () {
      this.$store.dispatch('markNotificationsAsSeen')
    },
    fetchOlderNotifications () {
      if (this.loading) {
        return
      }

      const store = this.$store
      const credentials = store.state.users.currentUser.credentials
      store.commit('setNotificationsLoading', { value: true })
      notificationsFetcher.fetchAndUpdate({
        store,
        credentials,
        older: true
      }).then(notifs => {
        store.commit('setNotificationsLoading', { value: false })
        if (notifs.length === 0) {
          this.bottomedOut = true
        }
      })
    }
  }
}

export default Notifications