#!@GUILE@ --no-auto-compile
-*- scheme -*-
-*- geiser-scheme-implementation: guile -*-
!#
;;; mumi -- Mediocre, uh, mail interface
;;; Copyright © 2016, 2017, 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2018, 2021 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of mumi.
;;;
;;; mumi 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.
;;;
;;; mumi 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 mumi.  If not, see <http://www.gnu.org/licenses/>.

(use-modules (srfi srfi-1)
             (srfi srfi-37)
             (system repl server)
             (ice-9 match)
             (ice-9 format)
             (mumi config)
             ((mumi debbugs)
              #:select (extract-bug-numbers))
             ((mumi jobs)
              #:select (worker-loop))
             ((mumi web server)
              #:select (start-mumi-web-server))
             ((mumi xapian)
              #:select (index!)))

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

;; Keep indexing the mail directory
(define %update-interval 30)

(define update-state!
  (let ((count -1))
    (lambda* (#:key loop?)
      (set! count (remainder (1+ count) 10))
      (catch #t
        (lambda ()
          (when (zero? count)
            (display "Starting full indexing." (current-error-port))
            (newline (current-error-port)))
          (index! #:full? (zero? count))
          (and loop?
               (begin
                 (format (current-error-port)
                         "Sleeping for ~a seconds." %update-interval)
                 (sleep %update-interval)
                 (update-state!))))
        (lambda args
          (format (current-error-port) "worker error: ~a~%" args)
          (sleep %update-interval)
          (update-state!))))))

(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 '("disable-mailer") #f #f
                (lambda (opt name arg result)
                  (alist-cons 'disable-mailer #t result)))
        (option '("sender") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'sender arg result)))
        (option '("smtp") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'smtp arg result)))))

(define %default-options
  ;; Alist of default option values
  `((listen-repl . #f)
    (smtp . #f)
    (sender . #f)
    (disable-mailer . #f)))

(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))

(define (show-mumi-usage)
  (format (current-error-port)
          "
    `mumi web [--listen-repl[=port]] [--disable-mailer]':
         start the application web server.

    `mumi mailer --sender=SENDER --smtp=SMTP:
         start a mailer process (requires Redis).

    `mumi worker':
         run an update loop to refresh issue information from Debbugs.

    `mumi fetch':
         index all Debbugs bug logs and update bug statuses once.

~%")
  (exit 1))

(match (cdr (program-arguments))
  (("mailer" . rest)
   (let* ((opts (parse-options rest))
          (sender (assoc-ref opts 'sender))
          (smtp (assoc-ref opts 'smtp)))
     (if (and sender smtp)
         (worker-loop opts)
         (error "Both sender and smtp options must be provided!"))))
  (("fetch")
   (update-state! #:loop? #f))
  (("worker")
   (update-state! #:loop? #t))
  (("web" . rest)
   (let ((opts (parse-options rest)))
     (parameterize ((mailer-enabled? (not (assoc-ref opts 'disable-mailer))))
       (let ((repl-port (assoc-ref opts 'listen-repl)))
         (when repl-port
           (format (current-error-port)
                   "REPL server listening on port ~a~%"
                   repl-port)
           (spawn-server (make-tcp-server-socket #:port repl-port))))
       (start-mumi-web-server 1234))))
  (_ (show-mumi-usage)))