meet/src/frontend/src/features/notifications/MainNotificationToast.tsx

import { useCallback, useEffect } from 'react'
import { useRoomContext } from '@livekit/components-react'
import { Participant, RemoteParticipant, RoomEvent } from 'livekit-client'
import { type ChatMessage, isMobileBrowser } from '@livekit/components-core'
import { useTranslation } from 'react-i18next'
import { NotificationType } from './NotificationType'
import { NotificationDuration } from './NotificationDuration'
import { decodeNotificationDataReceived } from './utils'
import { useNotificationSound } from '@/features/notifications/hooks/useSoundNotification'
import { toastQueue } from './components/ToastProvider'
import { layoutStore } from '@/stores/layout'
import { PanelId } from '@/features/rooms/livekit/hooks/useSidePanel'
import { useScreenReaderAnnounce } from '@/hooks/useScreenReaderAnnounce'
import { Emoji } from '@/features/reactions/types'
import { useReactions } from '@/features/reactions/hooks/useReactions'
import { NotificationProvider } from './NotificationProvider'
import { useConfig } from '@/api/useConfig'

export const MainNotificationToast = () => {
  const room = useRoomContext()
  const { data } = useConfig()
  const { triggerNotificationSound } = useNotificationSound()
  const { t } = useTranslation('notifications')
  const announce = useScreenReaderAnnounce()

  const { appendReaction } = useReactions()

  useEffect(() => {
    const handleChatMessage = (
      chatMessage: ChatMessage,
      participant?: Participant | undefined
    ) => {
      if (!participant || participant.isLocal) return
      triggerNotificationSound(NotificationType.MessageReceived)
      toastQueue.add(
        {
          participant: participant,
          message: chatMessage.message,
          type: NotificationType.MessageReceived,
        },
        { timeout: NotificationDuration.MESSAGE }
      )
      if (layoutStore.activePanelId !== PanelId.CHAT) {
        announce(
          t('chatMessageReceived', {
            name: participant.name || t('defaultName'),
            message: chatMessage.message,
          }),
          'polite'
        )
      }
    }
    room.on(RoomEvent.ChatMessage, handleChatMessage)
    return () => {
      room.off(RoomEvent.ChatMessage, handleChatMessage)
    }
  }, [room, triggerNotificationSound, announce, t])

  const handleEmoji = useCallback(
    (emoji: string, participant: Participant) => {
      if (!emoji || !Object.values(Emoji).includes(emoji as Emoji)) return
      appendReaction(emoji as Emoji, participant)
    },
    [appendReaction]
  )

  useEffect(() => {
    const handleDataReceived = (
      payload: Uint8Array,
      participant?: RemoteParticipant
    ) => {
      const notification = decodeNotificationDataReceived(payload)

      if (!notification) return

      switch (notification.type) {
        case NotificationType.ParticipantMuted:
          if (participant) {
            toastQueue.add(
              {
                participant,
                type: NotificationType.ParticipantMuted,
              },
              { timeout: NotificationDuration.ALERT }
            )
          }

          break
        case NotificationType.ReactionReceived:
          if (notification.data?.emoji && participant)
            handleEmoji(notification.data.emoji, participant)
          break
        case NotificationType.TranscriptionStarted:
        case NotificationType.TranscriptionStopped:
        case NotificationType.ScreenRecordingStarted:
        case NotificationType.ScreenRecordingStopped:
        case NotificationType.TranscriptionLimitReached:
        case NotificationType.ScreenRecordingLimitReached:
          toastQueue.add(
            {
              participant,
              type: notification.type,
            },
            { timeout: NotificationDuration.ALERT }
          )
          break
        case NotificationType.TranscriptionRequested:
        case NotificationType.ScreenRecordingRequested:
          toastQueue.add(
            {
              participant,
              type: notification.type,
            },
            { timeout: NotificationDuration.RECORDING_REQUESTED }
          )
          break
        case NotificationType.PermissionsRemoved: {
          const removedSources = notification?.data?.removedSources
          if (!removedSources?.length) break
          toastQueue.add(
            {
              participant,
              type: notification.type,
              removedSources: removedSources,
            },
            { timeout: NotificationDuration.ALERT }
          )
          break
        }
        default:
          return
      }
    }
    room.on(RoomEvent.DataReceived, handleDataReceived)
    return () => {
      room.off(RoomEvent.DataReceived, handleDataReceived)
    }
  }, [room, handleEmoji])

  const triggerNotificationSoundIfRoomIsSmall = useCallback(
    (type: NotificationType) => {
      if (!data) return
      if (room.numParticipants >= data.max_participants_for_sound) return
      triggerNotificationSound(type)
    },
    [room, data, triggerNotificationSound]
  )

  useEffect(() => {
    const showJoinNotification = (participant: Participant) => {
      if (isMobileBrowser()) {
        return
      }
      triggerNotificationSoundIfRoomIsSmall(NotificationType.ParticipantJoined)
      toastQueue.add(
        {
          participant,
          type: NotificationType.ParticipantJoined,
        },
        {
          timeout: NotificationDuration.PARTICIPANT_JOINED,
        }
      )
    }
    room.on(RoomEvent.ParticipantConnected, showJoinNotification)
    return () => {
      room.off(RoomEvent.ParticipantConnected, showJoinNotification)
    }
  }, [room, triggerNotificationSoundIfRoomIsSmall])

  useEffect(() => {
    const handleAttributeChanged = (
      changedAttributes: Record<string, string>,
      participant: Participant
    ) => {
      if (!participant.isLocal || !('room_role' in changedAttributes)) return
      const newRole = changedAttributes['room_role']
      toastQueue.add(
        {
          participant,
          type: NotificationType.RoleChanged,
          newRole: newRole,
        },
        {
          timeout: NotificationDuration.ROLE_CHANGED,
        }
      )
    }
    room.on(RoomEvent.ParticipantAttributesChanged, handleAttributeChanged)

    return () => {
      room.off(RoomEvent.ParticipantAttributesChanged, handleAttributeChanged)
    }
  }, [room])

  useEffect(() => {
    const removeParticipantNotifications = (participant: Participant) => {
      toastQueue.visibleToasts.forEach((toast) => {
        if (toast.content.participant === participant) {
          toastQueue.close(toast.key)
        }
      })
    }
    room.on(RoomEvent.ParticipantDisconnected, removeParticipantNotifications)
    return () => {
      room.off(
        RoomEvent.ParticipantDisconnected,
        removeParticipantNotifications
      )
    }
  }, [room])

  useEffect(() => {
    const handleNotificationReceived = (
      changedAttributes: Record<string, string>,
      participant: Participant
    ) => {
      if (!participant) return
      if (isMobileBrowser()) return
      if (participant.isLocal) return

      if (!('handRaisedAt' in changedAttributes)) return

      const existingToast = toastQueue.visibleToasts.find(
        (toast) =>
          toast.content.participant === participant &&
          toast.content.type === NotificationType.HandRaised
      )

      if (existingToast && !changedAttributes?.handRaisedAt) {
        toastQueue.close(existingToast.key)
        return
      }

      if (!existingToast && !!changedAttributes?.handRaisedAt) {
        triggerNotificationSound(NotificationType.HandRaised)
        toastQueue.add(
          {
            participant,
            type: NotificationType.HandRaised,
          },
          { timeout: NotificationDuration.HAND_RAISED }
        )
      }
    }

    room.on(RoomEvent.ParticipantAttributesChanged, handleNotificationReceived)

    return () => {
      room.off(
        RoomEvent.ParticipantAttributesChanged,
        handleNotificationReceived
      )
    }
  }, [room, triggerNotificationSound])

  useEffect(() => {
    const closeAllToasts = () => {
      toastQueue.visibleToasts.forEach(({ key }) => toastQueue.close(key))
    }
    room.on(RoomEvent.Disconnected, closeAllToasts)
    return () => {
      room.off(RoomEvent.Disconnected, closeAllToasts)
    }
  }, [room])

  // Without this line, when the component first renders,
  // the 'notifications' namespace might not be loaded yet
  useTranslation(['notifications'])

  return <NotificationProvider />
}