;;; jao-ednc.el --- Minibuffer notifications using EDNC  -*- lexical-binding: t; -*-

;; Copyright (C) 2020  jao

;; Author: jao <mail@jao.io>
;; Keywords: tools, abbrev

;; 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:

;;  Use the ednc package to provide a notification daemon that uses
;;  the minibuffer to display them.

;;; Code:

(require 'ednc)
(require 'jao-minibuffer)

(declare-function tracking-add-buffer "tracking")
(declare-function tracking-remove-buffer "tracking")

(defvar jao-ednc--count-format "{%d}")
(defvar jao-ednc--last-notification nil)

(defface jao-ednc-tracking '((t :inherit warning))
  "Tracking notifications face"
  :group 'jao-ednc)

(defun jao-ednc--format-last ()
  (when jao-ednc--last-notification
    (let ((s (ednc-format-notification jao-ednc--last-notification t)))
      (replace-regexp-in-string "\n" " " s))))

(defun jao-ednc--count ()
  (let ((no (length (ednc-notifications))))
    (if (> no 0) (format jao-ednc--count-format no) "")))

(defvar jao-ednc--handlers ())

(defun jao-ednc-add-handler (app handler)
  (add-to-list 'jao-ednc--handlers (cons app handler)))

(defun jao-ednc--default-handler (notification newp)
  (if newp
      (progn
        (tracking-add-buffer (get-buffer ednc-log-name) '(jao-ednc-tracking))
        (setq jao-ednc--last-notification notification)
        (jao-minibuffer-push-notification '(:eval (jao-ednc--format-last))))
    (tracking-remove-buffer (get-buffer ednc-log-name))
    (setq jao-ednc--last-notification nil)
    (jao-minibuffer-pop-notification)))

(defun jao-ednc--handler (notification)
  (alist-get (ednc-notification-app-name notification)
             jao-ednc--handlers
             #'jao-ednc--default-handler
             nil
             'string=))

(defun jao-ednc--on-notify (old new)
  (when old (funcall (jao-ednc--handler old) old nil))
  (when new (funcall (jao-ednc--handler new) new t)))

;;;###autoload
(defun jao-ednc-setup ()
  (setq jao-notify-use-messages-p t)
  (with-eval-after-load "tracking"
    (add-to-list 'tracking-faces-priorities 'jao-ednc-tracking)
    (when (listp tracking-shorten-modes)
      (add-to-list 'tracking-shorten-modes 'ednc-view-mode)))
  ;; (jao-minibuffer-add-variable '(jao-ednc--count) t)
  (add-hook 'ednc-notification-presentation-functions #'jao-ednc--on-notify)
  (ednc-mode))

;;;###autoload
(defun jao-ednc-pop ()
  (interactive)
  (pop-to-buffer-same-window ednc-log-name))

;;;###autoload
(defun jao-ednc-show ()
  (interactive)
  (if jao-ednc--last-notification
      (ednc-pop-to-notification-in-log-buffer jao-ednc--last-notification)
    (jao-ednc-pop)))

;;;###autoload
(defun jao-ednc-invoke-last-action ()
  (interactive)
  (if jao-ednc--last-notification
      (ednc-invoke-action jao-ednc--last-notification)
    (message "No active notifications"))
  (jao-minibuffer-pop-notification))

;;;###autoload
(defun jao-ednc-dismiss ()
  (interactive)
  (if jao-ednc--last-notification
      (ednc-dismiss-notification jao-ednc--last-notification)
    (jao-minibuffer-pop-notification)))

(provide 'jao-ednc)
;;; jao-ednc.el ends here