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;;; wifi-bluetooth-conf.el --- Configuration to manage wifi and bluetooth  -*- lexical-binding: t; -*-

;; Copyright (C) 2021  李俊緯

;; Author: 李俊緯 <mmemmew@gmail.com>
;; Keywords: comm, hardware, games, unix

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Configuration to manage wifi and bluetooth.

;;; Code:

;;;###autoload
(defvar durand-wifi-on-p nil
  "If WIFI is on or not.
This is defined in \"/Users/durand/.emacs.d/view-conf.el\"")

;;;###autoload
(defvar durand-bluetooth-on-p nil
  "If BLUETOOTH is on or not.
This is defined in \"/Users/durand/.emacs.d/view-conf.el\"")

;;;###autoload
(defun durand-wifi-filter (proc output)
  "Filter function to set the wifi variable.
This should only be used for the process \"durand-wifi\".
This is defined in \"/Users/durand/.emacs.d/view-conf.el\""
  (cond
   ((string= (process-name proc) "durand-wifi"))
   ((user-error "Filter function associated with a wrong process.")))
  (setq durand-wifi-on-p (string-match "On$" output)))

;;;###autoload
(defun durand-bluetooth-filter (proc output)
  "Filter function to set the bluetooth variable.
This should only be used for the process \"durand-bluetooth\".
This is defined in \"/Users/durand/.emacs.d/view-conf.el\""
  (cond
   ((string= (process-name proc) "durand-bluetooth"))
   ((user-error "Filter function associated with a wrong process.")))
  (setq durand-bluetooth-on-p (string-match "1" output)))

;;;###autoload
(defun durand-wifi-toggle ()
  "Check if WIFI is enabled, then ask to toggle WIFI."
  (interactive)
  (make-process
   :name "durand-wifi"
   :buffer nil
   :command '("networksetup" "-getairportpower" "en0")
   :filter #'durand-wifi-filter
   :sentinel #'ignore)
  (accept-process-output (get-process "durand-wifi"))
  (let* ((prompt (format "WIFI is %s. Do you want to turn WIFI %s"
                         (cond (durand-wifi-on-p "on")
                               ("off"))
                         (cond (durand-wifi-on-p "off?")
                               ("on?"))))
         (decision (y-or-n-p prompt)))
    (cond
     (decision
      (let ((new-state (cond (durand-wifi-on-p "off")
                             ("on"))))
        (make-process
         :name "durand-toggle-wifi"
         :buffer nil
         :command (list
                   "networksetup" "-setairportpower"
                   "en0" new-state)
         :sentinel #'ignore
         :filter #'ignore)
        (message "WIFI turned %s" new-state))))))

;;;###autoload
(defun durand-bluetooth-toggle ()
  "Check if BLUETOOTH is enabled, then ask to toggle BLUETOOTH."
  (interactive)
  (make-process
   :name "durand-bluetooth"
   :buffer nil
   :command '("blueutil" "-p")
   :filter #'durand-bluetooth-filter
   :sentinel 'ignore)
  (accept-process-output (get-process "durand-bluetooth"))
  (let* ((prompt (format "BLUETOOTH is %s. Do you want to turn BLUETOOTH %s"
                         (cond (durand-bluetooth-on-p "on")
                               ("off"))
                         (cond (durand-bluetooth-on-p "off?")
                               ("on?"))))
         (decision (y-or-n-p prompt)))
    (cond
     (decision
      (let ((new-state (cond (durand-bluetooth-on-p "0")
                             ("1"))))
        (make-process
         :name "durand-toggle-bluetooth"
         :buffer nil
         :command (list "blueutil" "-p" new-state)
         :sentinel 'ignore
         :filter 'ignore)
        (message "BLUETOOTH turned %s"
                 (cond (durand-bluetooth-on-p "off")
                       ("on"))))))))

;;;###autoload
(defconst durand-wifi-executable
  "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport"
  "The executable to manage some WIFI settings.")

;;;###autoload
(defconst durand-wifi-bluetooth-buffer
  "*durand-wifi-bluetooth*"
  "The buffer to accept outputs from commands managing WIFI or BLUETOOTH.")

;;;###autoload
(defun durand-wifi-list-ports (&optional arg)
  "List available wifi networks.
If ARG is non-nil, then list the currently connected port."
  (interactive "P")
  (cond
   ((and (get-buffer durand-wifi-bluetooth-buffer)
         (buffer-live-p (get-buffer durand-wifi-bluetooth-buffer)))
    (kill-buffer durand-wifi-bluetooth-buffer)))
  (cond ((null arg)
         (make-process
          :name "durand-wifi-list-ports"
          :buffer durand-wifi-bluetooth-buffer
          :command (list durand-wifi-executable "-I")
          :sentinel #'durand-wifi-list-sentinel))
        ((make-process
          :name "durand-wifi-list-ports"
          :buffer durand-wifi-bluetooth-buffer
          :command (list durand-wifi-executable "-s")
          :sentinel #'durand-wifi-list-sentinel) )))

;;;###autoload
(defvar durand-wifi-ssid-machine-alist
  (list
   (cons "20-1" "wifi-2")
   (cons "1-20-4F" "wifi-4")
   (cons "1-20-4F_2EX" "wifi-4")
   (cons "20123456" "wifi-20123456")
   (cons "20123456_2EX" "wifi-20123456")
   (cons "20123456_3EX" "wifi-20123456"))
  "A list of associations between the SSID of WIFI and the
machine name that we can use to search for the password in my
secret file.")

;;;###autoload
(defvar durand-wifi-scanned-ssids nil
  "The variable that holds the list of SSIDs of WIFI ports found
during the scan.")

;;;###autoload
(defvar durand-wifi-join-history nil
  "The variable that holds the history of WIFI ports joined.")

;;;###autoload
(defun durand-wifi-join-port (port &optional pwd)
  "Join PORT.
If PWD is non-nil, use that as the password."
  (interactive (let ((po (completing-read
                           "Port to join: " durand-wifi-scanned-ssids
                           nil nil nil 'durand-wifi-join-history))
                     (pwd (read-string "Password: ")))
                 (cond ((and pwd (not (string= pwd "")))
                        (list po pwd))
                       ((list po)))))
  (cond
   (pwd)
   ((let ((search-result
           (alist-get port
                      durand-wifi-ssid-machine-alist
                      nil nil #'string=)))
      (cond
       (search-result
        (setq
         pwd
         (funcall
          (plist-get
           (car (auth-source-search :host search-result))
           :secret))))))))
  (make-process
   :name "durand-wifi-join-port"
   :buffer durand-wifi-bluetooth-buffer
   :command (append
             (list "networksetup" "setairportnetwork" "en0"
                   port)
             (cond ((and pwd (not (string= pwd "")))
                    (list pwd))))
   :filter #'durand-wifi-join-filter))

;;;###autoload
(defun durand-wifi-list-sentinel (process status)
  "Extract and message the information about available WIFI's SSID's.
PROCESS should have the name \"durand-wifi-list-ports\".

This only does something when STATUS is the string \"finished\\n\"."
  (cond ((string-equal (process-name process) "durand-wifi-list-ports"))
        ((error "The list sentinel is applied to a wrong process: %S"
                process)))
  (let (first-var)
    (cond ((string-equal status "finished\n")
           (with-current-buffer durand-wifi-bluetooth-buffer
             (goto-char (point-min))
             (cond ((re-search-forward "AirPort: Off" nil t)
                    (message "Wifi is not enabled."))
                   ((re-search-forward "\\s-+SSID" (line-end-position) t)
                    (setq first-var t)
                    (setq durand-wifi-scanned-ssids nil)
                    (forward-line 1)
                    (let ((start 0))
                      (while (re-search-forward "\\S-" (line-end-position) t)
                        (forward-char -1)
                        (setq start (point))
                        (re-search-forward "\\s-" (line-end-position) t)
                        (forward-char -1)
                        (setq durand-wifi-scanned-ssids
                              (cons (buffer-substring-no-properties
                                     start (point))
                                    durand-wifi-scanned-ssids))
                        (forward-line 1))
                      (erase-buffer)
                      (goto-char (point-min))
                      (insert (string-join durand-wifi-scanned-ssids (string 10)))
                      (goto-char (point-min))))
                   ((re-search-forward "\\s-+SSID: " nil t)
                    (message (buffer-substring-no-properties
                              (point) (line-end-position))))))
           (cond (first-var
                  (display-buffer durand-wifi-bluetooth-buffer
                                  '((display-buffer-in-side-window)
                                    (side . bottom)
                                    (window-height . #'durand-fit-window-to-buffer-with-max)))
                  (with-current-buffer durand-wifi-bluetooth-buffer 
                    (fit-window-to-buffer
                     (get-buffer-window (current-buffer))
                     (floor (* durand-window-max-height
                               (frame-height
                                (window-frame
                                 (get-buffer-window (current-buffer))))))))))))))

;;;###autoload
(defun durand-wifi-join-filter (proc output)
  "Message the OUTPUT of the PROCESS."
  (cond ((string= (process-name proc) "durand-wifi-join-port"))
        ((error "The join filter is applied to a wrong process: %S"
                proc)))
  (message output))

(define-key global-map (vector 3 ?w ?w) #'durand-wifi-toggle)
(define-key global-map (vector 3 ?w ?b) #'durand-bluetooth-toggle)
(define-key global-map (vector 3 ?w ?l) #'durand-wifi-list-ports)
(define-key global-map (vector 3 ?w ?j) #'durand-wifi-join-port)

;; Control the display of the buffer
;; (setq display-buffer-alist
;;       (delete (assoc durand-wifi-bluetooth-buffer display-buffer-alist #'string-match)
;;               display-buffer-alist))
;; (cond
;;  ((assoc durand-wifi-bluetooth-buffer display-buffer-alist #'string-match)
;;   (setcdr (assoc durand-wifi-bluetooth-buffer
;;                  display-buffer-alist #'string-match)
;;           '((display-buffer-at-bottom)
;;             (window-height . #'durand-fit-window-to-buffer-with-max))))
;;  (t
;;   (add-to-list 'display-buffer-alist
;;                `(,(rx-to-string `(seq bos ,durand-wifi-bluetooth-buffer eos))
;;                  (display-buffer-at-bottom)
;;                  (window-height . #'durand-fit-window-to-buffer-with-max)))))

(provide 'wifi-bluetooth-conf)
;;; wifi-bluetooth-conf.el ends here