;;; Copyright © 2019 - 2023 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (jakob dynamic config)
  #:export (%debug-enabled
            %api-server-port
            paramstring-for-dbname
            absolute-url))

;; Whether or not to enable "debug mode", in which:
;;
;;   - Log messages are written to stdout.
;;   - Rate limiting is disabled.
(define %debug-enabled (make-parameter (or (getenv "API_SERVER_DEBUG") #f)))

;; Port that the API server should listen on
(define %api-server-port (make-parameter (or (getenv "API_SERVER_PORT") 8080)))

;; Should be fairly self-explanatory.
(define %postgresql-user (make-parameter (or (getenv "API_SERVER_DB_USER") "jakob_dynamic")))
(define %postgresql-host (make-parameter (or (getenv "API_SERVER_DB_HOST") "localhost")))
(define %postgresql-port (make-parameter (or (getenv "API_SERVER_DB_PORT") "5432")))

(define (paramstring-for-dbname dbname)
  (format #f "host=~a port=~a user=~a dbname=~a"
          (%postgresql-host)
          (%postgresql-port)
          (%postgresql-user)
          dbname))

(define (absolute-url relative-path)
  "Produce an absolute URL from the identifier RELATIVE-PATH"
  (if (%debug-enabled)
      (format #f "http://localhost:~a/~a" (%api-server-port) relative-path)
      (string-append "https://jakob.space" relative-path)))