class SignupController < ApplicationController
  before_action :require_user_signed_out
  before_action :require_invitation
  before_action :set_invitation

  layout "signup"

  def index
    @invited_by_name = @invitation.user.address
  end

  private

  def require_invitation
    if session[:invitation_token].blank?
      flash.now[:alert] = "You need an invitation to sign up for an account."
      http_status :unauthorized
    elsif !valid_invitation?(session[:invitation_token])
      flash.now[:alert] = "This invitation either doesn't exist or has already been used."
      http_status :unauthorized
    end

    @invitation = Invitation.find_by(token: session[:invitation_token])
  end

  def valid_invitation?(token)
    Invitation.where(token: session[:invitation_token], used_at: nil).exists?
  end

  def set_invitation
    @invitation = Invitation.find_by(token: session[:invitation_token])
  end
end