require "uri"

module Backup
  module Notifier
    class Prowl < Base
      ##
      # Application name
      # Tell something like your server name. Example: "Server1 Backup"
      attr_accessor :application

      ##
      # API-Key
      # Create a Prowl account and request an API key on prowlapp.com.
      attr_accessor :api_key

      def initialize(model, &block)
        @message =
          lambda do |m, _|
            "#{m.label} (#{m.trigger})"
          end

        super

        instance_eval(&block) if block_given?
      end

      private

      ##
      # Notify the user of the backup operation results.
      #
      # `status` indicates one of the following:
      #
      # `:success`
      # : The backup completed successfully.
      # : Notification will be sent if `on_success` is `true`.
      #
      # `:warning`
      # : The backup completed successfully, but warnings were logged.
      # : Notification will be sent if `on_warning` or `on_success` is `true`.
      #
      # `:failure`
      # : The backup operation failed.
      # : Notification will be sent if `on_warning` or `on_success` is `true`.
      #
      def notify!(status)
        send_message(status)
      end

      def send_message(status)
        uri = "https://api.prowlapp.com/publicapi/add"
        status_data = status_data_for(status)
        data = {
          application: application,
          apikey: api_key,
          event: status_data[:message],
          description: message.call(model, status: status_data)
        }
        options = {
          headers: { "Content-Type" => "application/x-www-form-urlencoded" },
          body: URI.encode_www_form(data)
        }
        options[:expects] = 200 # raise error if unsuccessful
        Excon.post(uri, options)
      end
    end
  end
end
