require 'json'
require 'faraday'

module ErrandBoy
  module Gateway
    class Slack
      def initialize(request)
        @request = request
      end

      def call
        send(@request.action)
      rescue NoMethodError
        raise NoActionError, "#{@request.action}: action not found."
      end

      def invite
        response = connect.post 'api/users.admin.invite', params
        result = JSON.parse response.body
        unless result['ok']
          @processed = true if result['error'] == 'already_invited'
          raise SlackInviteMissingError, result['error'] unless processed?
        end
      end

      def team
        @request.destination['team']
      end

      def url
        "https://#{team}.slack.com/"
      end

      def processed?
        @processed
      end

      private

      def connect
        Faraday.new(url: url) do |faraday|
          faraday.request :url_encoded
          # faraday.response :logger
          faraday.adapter Faraday.default_adapter
        end
      end

      def params
        {
          email: @request.register['email'],
          token: ErrandBoy.slack_access_token,
          set_active: true
        }
      end
    end
  end
end