class WebhooksController < ApplicationController
  skip_forgery_protection

  before_action :authorize_request
  before_action :process_payload

  def lndhub
    @user = User.find_by!(ln_account: @payload[:user_login])

    if @zap_request = fetch_nostr_event_from_description
      NostrManager::PublishZapReceipt.call(
        user: @user, zap_request: @zap_request
      )
    end

    send_notifications

    head :ok
  end

  private

  def authorize_request
    if !ENV['WEBHOOKS_ALLOWED_IPS'].split(',').include?(request.remote_ip)
      head :forbidden and return
    end
  end

  def process_payload
    @payload = JSON.parse(request.body.read, symbolize_names: true)
    head :no_content and return unless @payload[:type] == "incoming"
  rescue
    head :unprocessable_entity and return
  end

  def fetch_nostr_event_from_description
    memo_json = JSON.parse(@payload[:memo])
    Nostr::Event.new(**memo_json.to_h.symbolize_keys)
  rescue
    nil
  end

  def send_notifications
    notify = @user.preferences[:lightning_notify_sats_received]
    case notify
    when "xmpp"
      notify_xmpp
    when "email"
      notify_email
    end
  end

  # TODO refactor into mailer-like generic class/service
  def notify_xmpp
    XmppSendMessageJob.perform_later({
      type: "normal",
      from: Setting.xmpp_notifications_from_address,
      to: @user.address,
      subject: "Sats received!",
      body: "#{helpers.number_with_delimiter @payload[:amount]} sats received in your Lightning wallet:\n> #{@payload[:memo]}"
    })
  end

  def notify_email
    NotificationMailer.with(user: @user, amount_sats: @payload[:amount])
                      .lightning_sats_received.deliver_later
  end
end