defmodule NotificationDispatcher.Service.NotificationService do
  @moduledoc """
    This module has every function responsible for sending the different types of email on the application
  """

  alias NotificationDispatcher.Context.NotificationsContext

  def send_notification(user_id, to, type, params, language, device_id \\ nil) do
    notification = NotificationsContext.get_by_type_and_language(type, language)

    notification = if notification == nil do
      NotificationsContext.get_by_type(type)
    else
      notification
    end

    if notification != nil do

      offsets = Poison.decode!(notification.dispatch_offsets)

      Enum.each(
        offsets,
        fn offset ->
          time_now = NaiveDateTime.local_now

          time_now = Timex.shift(time_now, minutes: offset)

          content = Poison.encode!(
            %{
              user_id: user_id,
              title: notification.title,
              message: notification.message,
              email: to,
              device_id: device_id,
              fcm_token: to,
              locale: language,
              channel: notification.channel,
              params: params,
              dispatched_at: time_now,
              type: type
            }
          )

          NotificationDispatcher.Sender.send_message("notification_exchange", content, offset)
        end
      )

    else
      :template_not_found_error
    end
  end
end