#!@GUILE@ --no-auto-compile
-*- scheme -*-
-*- geiser-scheme-implementation: guile -*-
!#
;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2016, 2017 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of guix-data-service.
;;;
;;; guix-data-service 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.
;;;
;;; guix-data-service 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 the guix-data-service.  If not, see
;;; <http://www.gnu.org/licenses/>.

(use-modules (srfi srfi-1)
             (srfi srfi-37)
             (system repl server)
             (guix-data-service config)
             (guix-data-service web server))

(define %default-repl-server-port
  ;; Default port to run REPL server on, if --listen-repl is provided
  ;; but no port is mentioned
  37146)

(define %options
  ;; Specifications of the command-line options
  (list (option '("listen-repl") #f #t
                (lambda (opt name arg result)
                  (let ((port (cond (arg => string->number)
                                    (else %default-repl-server-port))))
                    (if port
                        (alist-cons 'listen-repl port
                                    (alist-delete 'listen-repl result))
                        (error "invalid REPL server port" arg)))))
        (option '("pid-file") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'pid-file
                              arg
                              result)))
        (option '("update-database") #f #f
                (lambda (opt name _ result)
                  (alist-cons 'update-database #t result)))
        (option '("port") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'port
                              (string->number arg)
                              (alist-delete 'port result))))
        (option '("host") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'host
                              arg
                              (alist-delete 'host result))))))


(define %default-options
  ;; Alist of default option values
  `((listen-repl          . #f)
    (update-database      . #f)
    (port                 . 8765)
    (host                 . "0.0.0.0")))

(define (parse-options args)
  (args-fold
   args %options
   (lambda (opt name arg result)
     (error "unrecognized option" name))
   (lambda (arg result)
     (error "extraneous argument" arg))
   %default-options))

(setvbuf (current-output-port) 'line)
(setvbuf (current-error-port) 'line)

(let ((opts (parse-options (cdr (program-arguments)))))
  (let ((repl-port (assoc-ref opts 'listen-repl)))
    (when repl-port
      (spawn-server (make-tcp-server-socket #:port repl-port))))

  (when (assoc-ref opts 'update-database)
    (let ((command
           (list (%config 'sqitch)
                 "deploy"
                 "--db-client" (%config 'sqitch-psql)
                 "--chdir" (dirname (%config 'sqitch-plan))
                 "--plan-file" (%config 'sqitch-plan)
                 (string-append "db:pg://"
                                (%config 'database-user)
                                "@"
                                (if (string=? (%config 'database-host)
                                              "localhost")
                                    ""  ; This means the unix socket
                                        ; connection will be used
                                    (%config 'database-host))
                                "/"
                                (%config 'database-name)))))
      (simple-format #t "running command: ~A\n"
                     (string-join command))
      (unless (zero? (apply system* command))
        (simple-format
         (current-error-port)
         "error: sqitch command failed\n")
        (exit 1))))

  (let ((pid-file (assq-ref opts 'pid-file)))
    (when pid-file
      (call-with-output-file pid-file
        (lambda (port)
          (simple-format port "~A\n" (getpid))))))

  (simple-format #t "starting the server on port ~A\n"
                 (assq-ref opts 'port))

  (start-guix-data-service-web-server (assq-ref opts 'port)
                                      (assq-ref opts 'host)))