module UNotifier
  module UserNotifier
    def self.notify_user(notification, params = {})
      locale_key = UNotifier.locale_key_for(notification.key, params)

      user_settings =
        notification.target.notification_settings.is_a?(Hash) &&
        notification.target.notification_settings.dig("user", notification.key)
      user_settings ||= Settings::DEFAULT_URGENCY

      notify_with = []

      if !params[:external_only] && notify_onsite?(notification, user_settings)
        notify_with += UNotifier.configuration.site_providers
      end

      if !params[:onsite_only] && notify_external?(notification, user_settings)
        notify_with += UNotifier.configuration.external_providers
      end

      notify_with.each do |provider|
        title_provider_key = "#{locale_key}.#{provider.class.to_s.split("::").last}.title"
        body_provider_key  = "#{locale_key}.#{provider.class.to_s.split("::").last}.body"

        if UNotifier.configuration.localization_provider.exists?(title_provider_key)
          notification.title =
            UNotifier.configuration.localization_provider.t(
              title_provider_key, params.merge(locale: notification.target.locale)
            )
        end

        if UNotifier.configuration.localization_provider.exists?(body_provider_key)
          notification.body =
            UNotifier.configuration.localization_provider.t(
              body_provider_key, params.merge(locale: notification.target.locale, default: "")
            )
        end

        provider.notify(notification)
      end
    end

    def self.notify_onsite?(notification, user_settings)
      return false if notification.urgency == "optional" && user_settings == "off"

      notification.target.online?
    end

    def self.notify_external?(notification, user_settings)
      case notification.urgency
      when "immediate"
        true
      when "regular", "optional"
        user_settings == "external" && !notification.target.online?
      when "onsite"
        false
      else
        false
      end
    end
  end
end