(use-modules
 (ice-9 match)
 (srfi srfi-1)
 (srfi srfi-26))

(define* (mapconcat proc lst #:optional (separator ""))
  "Apply PROC to each element of LST and concatenate the result strings
into a single string using SEPARATOR."
  (match lst
    (() "")
    ((elt . rest)
     (fold (lambda (elt res)
             (string-append res separator (proc elt)))
           (proc elt)
           rest))))

(define (build-file-name . file-parts)
  "Return file name by concatenating FILE-PARTS with slashes."
  (mapconcat identity file-parts "/"))

(define (home-file . file-parts)
  "Return file name from my home directory."
  (apply build-file-name (getenv "HOME") file-parts))

;; (define* (make-service                  ; TODO: Test this.
;;            #:key start
;;            #:allow-other-keys
;;            #:rest args)
;;   "START is a list of strings that make up for the command line to start the service."
;;   (apply make <service>
;;          #:start (make-system-constructor
;;                   (mapconcat identity start " "))
;;          args))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(define xrdb
  (make <service>
    #:docstring "X resources for xterm.
Some DM merge this automatically; we merge it for the others."
    #:provides '(xrdb)
    #:start (make-system-constructor
             (string-join (list "xrdb" "-merge" (home-file ".Xresources"))))
    #:one-shot? #t))

(define setxkbmap
  (make <service>
    #:docstring "Set keymap for X."
    #:provides '(setxkbmap)
    #:start (make-system-constructor
             (string-join '("setxkbmap"
                            "-layout" "us"
                            "-variant" "altgr-intl"
                            "-option" "ctrl:swapcaps,nodeadkeys,nbsp:level3")))
    #:one-shot? #t))

;; (define xcape-service-type
;;   (shepherd-service-type
;;    'xcape-service
;;    (lambda (rules)
;;      (define rule
;;        (string-join (map (lambda (keys) (string-append (car keys) "=" (cdr keys)))
;;                          rules)
;;                     ";"))
;;      (define xcape-command
;;        #~(list #$(file-append xcape "/bin/xcape") "-e" #$rule))
;;
;;      (shepherd-service
;;       (provision '(xcape))
;;       (requirement '(xorg-server user-processes))
;;       (documentation (string-append "Keep xcape alive for rule: " rule))
;;       (start
;;        #~(make-forkexec-constructor
;;           #$xcape-command
;;           #:log-file "/var/log/xcape.log"))
;;       (stop #~(make-kill-destructor))))))

(define xcape
  (make <service>
    #:provides '(xcape)
    #:requires '(setxkbmap)
    #:start (make-system-constructor "xcape -e 'Control_L=Escape'")
    #:stop (make-system-destructor "pkill xcape")
    #:respawn? #t))

(define numlock
  (make <service>
    #:provides '(numlock numlockx)
    #:start (make-system-constructor "numlockx on")
    #:one-shot? #t))

(define xbindkeys
  (make <service>
    #:provides '(xbindkeys)
    #:requires '(setxkbmap)
    #:start (make-system-constructor "xbindkeys")
    #:stop (make-system-destructor "pkill xbindkeys")))

(define privoxy
  (make <service>
    #:provides '(privoxy)
    #:docstring "Privoxy filters outgoing Internet connections"
    ;; TODO: Fix make-forkexec-constructor for privoxy.
    ;; #:start (make-forkexec-constructor
    ;;          '("privoxy" "--no-daemon"
    ;;            (home-file  ".config/privoxy/config"))
    ;;          ;; #:log-file (home-file ".cache/privoxy/privoxy.log")
    ;;          )
    #:start (make-system-constructor "privoxy --no-daemon ~/.config/privoxy/config &")
    #:stop (make-system-destructor "pkill privoxy")
    #:respawn? #t))

(define no-bell
  (make <service>
    #:provides '(no-bell)
    #:start (make-system-constructor "xset -b")
    #:one-shot? #t))

(define auto-lock
  (make <service>
    #:provides '(auto-lock)
    #:start (make-system-constructor "xss-lock slock &")
    #:stop (make-system-destructor "pkill xss-lock")
    #:respawn? #t))

(define auto-mount
  (make <service>
    #:provides '(auto-mount)
    #:start (make-system-constructor "udiskie &")
    #:stop (make-system-destructor "pkill udiskie")
    #:respawn? #t))

(define cron
  (make <service>
    #:provides '(cron)
    #:docstring "Crontab manager.
Start after PATH is fully set or else local programs could
be missing."
    #:start (make-system-constructor "mcron &")
    #:stop (make-system-destructor "pkill mcron")
    #:respawn? #t))

(define main-services (list
                       privoxy
                       auto-mount
                       cron))

(define display-services (list
                          xrdb
                          setxkbmap
                          xcape
                          numlock
                          xbindkeys
                          no-bell
                          auto-lock))

(define laptop-services (list
                         xbindkeys))