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+;;; jao-mullvad.el --- Calling the mullvad cli       -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  jao
+
+;; Author: jao <mail@jao.io>
+;; Keywords: processes
+
+;; 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:
+
+;; Simple helpers to call mullvad and parse its output
+
+;;; Code:
+
+(defvar jao-mullvad-mode-map
+  (let ((map (make-keymap)))
+    (suppress-keymap map)
+    (define-key map [?q] 'bury-buffer)
+    (define-key map [?n] 'next-line)
+    (define-key map [?p] 'previous-line)
+    (define-key map [?g] 'jao-mullvad-status)
+    (define-key map [?l] 'jao-mullvad-list)
+    (define-key map [?u] 'jao-mullvad-update-list)
+    (define-key map [?r] 'jao-mullvad-reconnect)
+    (define-key map [?d] 'jao-mullvad-disconnect)
+    (define-key map [?c] 'jao-mullvad-connect)
+    map))
+
+(defvar jao-mullvad--buffer "*mullvad*")
+
+;;;###autoload
+(defun jao-mullvad-mode ()
+  "A very simple mode to show the output of mulvad commands."
+  (interactive)
+  (kill-all-local-variables)
+  (buffer-disable-undo)
+  (use-local-map jao-mullvad-mode-map)
+  ;; (setq-local font-lock-defaults '(jao-jao-mullvad-font-lock-keywords))
+  (setq-local truncate-lines t)
+  (setq-local next-line-add-newlines nil)
+  (setq major-mode 'jao-mullvad-mode)
+  (setq mode-name "mullvad")
+  (read-only-mode 1))
+
+(defun jao-mullvad--do (things &optional buffer)
+  "Execute a mullvad command THINGS in the given BUFFER."
+  (let ((b (or buffer (pop-to-buffer (get-buffer-create jao-mullvad--buffer)))))
+    (let ((inhibit-read-only t)
+          (cmd (format "mullvad %s" things)))
+      (delete-region (point-min) (point-max))
+      (message "Running: %s ...." cmd)
+      (shell-command cmd b)
+      (message ""))
+    (jao-mullvad-mode)))
+
+(defconst jao-mullvad--country-rx "^\\([^ \t\n]+ (...?)\\)$")
+(defconst jao-mullvad--city-rx "	\\([^ 	(]+ (...)\\)")
+
+(defun jao-mullvad--list ()
+  "Compute an alist of available relay countries with their cities."
+  (with-temp-buffer
+    (jao-mullvad--do "relay list" (current-buffer))
+    (goto-char (point-min))
+    (let ((countries) (country))
+      (while (not (eobp))
+        (cond ((looking-at jao-mullvad--country-rx)
+               (when country
+                 (setq countries (cons (reverse country) countries)))
+               (setq country (list (match-string 1))))
+              ((looking-at jao-mullvad--city-rx)
+               (setq country (cons (match-string 1) country))))
+        (forward-line 1))
+      (reverse countries))))
+
+;;;###autoload
+(defun jao-mullvad-status ()
+  "Display mullvad connection status, including country, city and server."
+  (interactive)
+  (jao-mullvad--do "status")
+  (when (re-search-forward "[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" nil t)
+    (let ((ip (match-string 0)) (country "") (city "") (server ""))
+      (with-temp-buffer
+        (jao-mullvad--do "relay list" (current-buffer))
+        (goto-char (point-min))
+        (when (search-forward ip nil t)
+          (beginning-of-line)
+          (when (looking-at "\t\t\\([^( ]+\\) (")
+            (setq server (match-string 1)))
+          (when (re-search-backward jao-mullvad--city-rx nil t)
+            (setq city (string-trim (match-string 0))))
+          (when (re-search-backward jao-mullvad--country-rx nil t)
+            (setq country (match-string 0)))))
+      (let ((inhibit-read-only t))
+        (forward-line 1)
+        (insert "Connected to " country " " city  "  - " server "\n")
+        (goto-char (point-min))))))
+
+;;;###autoload
+(defun jao-mullvad-connect ()
+  "Choose a country and city and set them to the default relay location."
+  (interactive)
+  (let* ((cc (jao-mullvad--list))
+         (country (completing-read "Country: " (mapcar #'car cc) nil t))
+         (city (completing-read "City: " (cdr (assoc country cc #'string=))))
+         (cntr (and (string-match "(\\(...?\\))" country) (match-string 1 country)))
+         (code (and (string-match "(\\(...\\))" city) (match-string 1 city))))
+    (when (y-or-n-p (format "Set location to %s / %s?" country city))
+      (jao-mullvad--do (format "relay set location %s %s" cntr code)))))
+
+;;;###autoload
+(defun jao-mullvad-reconnect ()
+  "Ask mullvad to reconnect."
+  (interactive)
+  (jao-mullvad--do "reconnect"))
+
+;;;###autoload
+(defun jao-mullvad-disconnect ()
+  "Ask mullvad to disconnect, after confirmation."
+  (interactive)
+  (when (y-or-n-p "Disconnect?") (jao-mullvad--do "disconnect")))
+
+;;;###autoload
+(defun jao-mullvad-list ()
+  "List all available relay locations."
+  (interactive)
+  (jao-mullvad--do "relay list"))
+
+;;;###autoload
+(defun jao-mullvad-update-list ()
+  "Update list of available relay locations (background operation)."
+  (interactive)
+  (jao-mullvad--do "relay update"))
+
+
+(provide 'jao-mullvad)
+;;; jao-mullvad.el ends here