class TokenHash

  def self.encode(auth_token_hash,user_id)
    obj = {}
    obj["auth_token"] = auth_token_hash
    obj["user_id"] = user_id
    #Lasts a 4th of the time as the db tokens
    obj["exp"] = ::Time.now.to_i() + ::Settings.expire_time*15
    return ::JWT.encode(obj,::Rails.application.secrets.secret_key_base)
  end

  def self.decode(params,request,response)
    instance_hash = nil
    auth_token_obj = ::Arcadex::Header.grab_param_header(params,request,::Settings.token_header,false)
    begin
      # Try JWT token
      jwt = ::JWT.decode(auth_token_obj,::Rails.application.secrets.secret_key_base)
      token = jwt[0]
      return make_hash(token["user_id"],token["auth_token"])
    rescue ::JWT::ExpiredSignature
      return handle_expired(auth_token_obj,params,request,response)
    rescue ::JWT::DecodeError
      return handle_abnormal(auth_token_obj,params,request,response)
    end
  end

  def self.handle_expired(auth_token_obj,params,request,response)
    # Token expired, destroy arcadex token
    jwt = ::JWT.decode(auth_token_obj,::Rails.application.secrets.secret_key_base,true,{verify_expiration: false})
    token = jwt[0]
    # This is nil if the db_token is expired
    db_token = ::Arcadex::Find.find_token_by_auth_token(token["auth_token"])
    if db_token.nil?
      return nil
    else
      if ::Settings.revalidate_tokens == "true"
        # Send a new JWT back to the user since the db_token is still valid
        new_token = encode(db_token.auth_token,token["user_id"])
        response.headers[::Settings.token_header] = new_token
        return make_hash(token["user_id"],token["auth_token"])
      else
        db_token.destroy
        return nil
      end
    end
  end

  def self.handle_abnormal(auth_token_obj,params,request,response)
    # Try Arcadex token
    instance_hash = ::Arcadex::Authentication.get_instance(params,request,::Settings.token_header)
    if !instance_hash.nil?
      instance_hash["auth_token"] = nil
    end
    return instance_hash
  end

  def self.make_hash(user_id,auth_token)
    instance_hash = {}
    instance_hash["current_owner"] = nil
    instance_hash["current_token"] = nil
    instance_hash["user_id"] = user_id
    instance_hash["auth_token"] = auth_token
    return instance_hash
  end

end