class API::V2::BaseController < ApplicationController
  # This controller is used for API v2 through api endpoint (/api/v2/graphql)
  # and through the web interface (/graphql). When used through the web interface,
  # we use connected administrateur to authenticate the request. We want CSRF protection
  # for the web interface, but not for the API endpoint. :null_session means that when the
  # request is not CSRF protected, we will not raise an exception,
  # but we will provide the controller with an empty session.
  protect_from_forgery with: :null_session
  skip_before_action :setup_tracking
  before_action :authenticate_from_token
  before_action :ensure_authorized_network, if: -> { @api_token.present? }
  before_action :ensure_token_is_not_expired, if: -> { @api_token.present? }
  before_action :allow_only_persisted_queries, if: -> { @api_token.blank? }

  before_action do
    Current.browser = 'api'
  end

  private

  def context
    if @api_token.present?
      @api_token.context
    # web interface (/graphql) give current_administrateur
    elsif current_administrateur.present?
      graphql_web_interface_context
    else
      unauthenticated_request_context
    end
  end

  def graphql_web_interface_context
    {
      administrateur_id: current_administrateur.id,
      procedure_ids: current_administrateur.procedure_ids,
      write_access: true
    }
  end

  def unauthenticated_request_context
    {
      administrateur_id: nil,
      procedure_ids: [],
      write_access: false
    }
  end

  def authenticate_from_token
    @api_token = authenticate_with_http_token { |t, _o| APIToken.authenticate(t) }

    if @api_token.present?
      @api_token.touch(:last_v2_authenticated_at)
      @api_token.store_new_ip(request.remote_ip)
      @current_user = @api_token.administrateur.user
      Current.user = @current_user
    end
  end

  def allow_only_persisted_queries
    if params[:queryId].blank?
      render json: graphql_error('Without a token, only persisted queries are allowed', :forbidden), status: :forbidden
    end
  end

  def ensure_authorized_network
    if @api_token.forbidden_network?(request.remote_ip)
      address = IPAddr.new(request.remote_ip)
      render json: graphql_error("Request issued from a forbidden network. Add #{address.to_string}/#{address.prefix} to your allowed adresses in your /profil", :forbidden), status: :forbidden
    end
  end

  def ensure_token_is_not_expired
    if @api_token.expired?
      render json: graphql_error('Token expired', :unauthorized), status: :unauthorized
    end
  end

  def graphql_error(message, code, exception_id: nil, backtrace: nil)
    {
      errors: [
        {
          message:,
          extensions: { code:, exception_id:, backtrace: }.compact
        }
      ],
      data: nil
    }
  end
end