#!@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 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-26)
             (srfi srfi-37)
             (system repl server)
             (ice-9 match)
             (ice-9 threads)
             (ice-9 format)
             (mumi config)
             (mumi bugs)
             (mumi jobs)
             (mumi messages)
             (mumi web server)
             (debbugs))

(db-create!)

(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 60)
(define mu-index
  (let ((mu (%config 'mu-executable)))
    (lambda _
      (let* ((maildir (%config 'mail-dir))
             (args (list "index"
                         "--quiet"
                         (format #f "--muhome=~a" maildir)
                         (format #f "--maildir=~a" maildir))))
        (unless (zero? (apply system* mu args))
          (format (current-error-port)
                  "Failed to index `~a'~%" (%config 'mail-dir)))))))

(define (fetch-messages!)
  (let ((bug-nums
         (sort (append-map (lambda (package)
                             (soap-invoke* (%config 'debbugs)
                                           get-bugs
                                           `((package . ,package))))
                           (%config 'packages)) <)))
    (for-each (lambda (bug-num i)
                (let ((msg-nums
                       (match (soap-invoke* (%config 'debbugs)
                                            get-bug-message-numbers
                                            bug-num)
                         ((nums . ids) nums))))
                  (format (current-error-port)
                          "[~a/~a] Refreshing ~a messages of bug ~a...~%"
                          i (length bug-nums)
                          (length msg-nums) bug-num)
                  (parameterize ((current-error-port (%make-void-port OPEN_WRITE)))
                    (par-for-each (cut download-message bug-num <>)
                                  msg-nums))))
              (reverse bug-nums)
              (iota (length bug-nums) 1))))

(define update-state!
  (lambda _
    (catch #t
      (lambda ()
        (fetch-messages!)
        (mu-index)
        (update-bug-database!)
        (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))

(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!"))))
  (("worker")
   (update-state!))
  (("fetch")
   (fetch-messages!))
  (("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
           (spawn-server (make-tcp-server-socket #:port repl-port))))
       (use-modules (mumimu))
       (mu-index)
       (mu:initialize (%config 'mail-dir))
       (start-mumi-web-server 1234)))))