# Manages self authentication responses
class SelfAuthResponseManagerService
  STATUS_ERR = 'errored'.freeze
  STATUS_REJ = 'rejected'.freeze
  STATUS_OK = 'accepted'.freeze
  STATUS_COM = 'completed'.freeze
  STATUS_RECIEVED = 'received'.freeze

  def initialize(broadcaster)
    @broadcaster = broadcaster
  end

  # Processes a Self authentication response
  def process_response(self_auth_response)
    return if self_auth_response.nil?

    cid = self_auth_response.id.split('_').first.split('::').last
    channel = "conversation_#{cid}_channel"

    if self_auth_response.errored?
      broadcast_status_change channel, STATUS_ERR, message: 'A timeout ocured while waiting for your device response'
      return
    end

    if self_auth_response.rejected?
      broadcast_status_change channel, STATUS_REJ
      return
    end

    unless admin?(self_auth_response.from)
      broadcast_status_change channel, STATUS_ERR, message: 'You are forbidden to access this service'
      return
    end

    user = set_user_token(self_auth_response.from, self_auth_response)
    broadcast_status_change channel, STATUS_COM, token: user[:token]
  end

  private

  # creates or updates a user setting a random token.
  def set_user_token(selfid, self_auth_response)
    user = {
      token: SecureRandom.uuid,
      selfid: selfid,
      facts: {}
    }

    SelfAuthRails.auth_facts.each do |fact|
      user[:facts][fact] = self_auth_response.attestation_values_for(fact).first
    end

    u = SelfAuthRails.session_class.find_by(selfid: user[:selfid])
    u = SelfAuthRails.session_class.new(selfid: user[:selfid]) if u.nil?
    u.token = user[:token]
    SelfAuthRails.fact_mapping.each do |fact_name, field|
      u.send("#{field}=", user[:facts][fact_name.to_sym])
    end
    u.save!

    user
  end

  # broadcasts a status change through websockets to the web client
  def broadcast_status_change(channel, status, opts = {})
    token = opts.fetch(:token, '')
    message = opts.fetch(:message, '')
    type = opts.fetch(:type, 'auth')
    @broadcaster.broadcast channel, { status: status, token: token, message: message, type: type }
  end

  # checks if the given id is in the admins list
  def admin?(id)
    ENV['ADMIN_IDS'].split(',').include? id
  end
end