mobilizon/lib/service/events/tools.ex

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defmodule Mobilizon.Service.Events.Tool do
@moduledoc """
Event-related tools
"""
alias Mobilizon.Events
alias Mobilizon.Events.Event
alias Mobilizon.Actors.Actor
alias Mobilizon.Users.User
alias MobilizonWeb.Email
alias Mobilizon.Storage.Repo
@important_changes [:title, :begins_on, :ends_on]
def calculate_event_diff_and_send_notifications(
%Event{} = old_event,
%Event{id: event_id} = event,
changes
) do
important = MapSet.new(@important_changes)
diff =
changes
|> Map.keys()
|> MapSet.new()
|> MapSet.intersection(important)
if MapSet.size(diff) > 0 do
Repo.transaction(fn ->
event_id
|> Events.list_local_emails_user_participants_for_event_query()
|> Repo.stream()
|> Enum.to_list()
|> Enum.each(
&send_notification_for_event_update_to_participant(&1, old_event, event, diff)
)
end)
end
end
defp send_notification_for_event_update_to_participant(
{%Actor{} = actor, %User{} = user},
%Event{} = old_event,
%Event{} = event,
diff
) do
user
|> Email.Event.event_updated(actor, old_event, event, diff)
|> Email.Mailer.deliver_later()
end
end