;;; slack-message-reaction.el --- adding, removing reaction from message  -*- lexical-binding: t; -*-

;; Copyright (C) 2015  yuya.minami

;; Author: yuya.minami <yuya.minami@yuyaminami-no-MacBook-Pro.local>
;; Keywords:

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

;;; Commentary:

;;

;;; Code:

(require 'slack-message)
(require 'slack-reaction)
(require 'slack-room)

(defconst slack-message-reaction-add-url "https://slack.com/api/reactions.add")
(defconst slack-message-reaction-remove-url "https://slack.com/api/reactions.remove")
(defvar slack-current-team-id)
(defvar slack-current-room-id)
(defvar slack-emojify-comp-list)
(defcustom slack-invalid-emojis '("^:flag_" "tone[[:digit:]]:$" "-" "^[^:].*[^:]$" "\\Ca")
  "Invalid emoji regex. Slack server treated some emojis as Invalid."
  :group 'slack)

(defun slack-message-reaction-load-emojify-comp-list ()
  (if (and (bound-and-true-p emojify-emojis)
           (not (bound-and-true-p slack-emojify-comp-list)))
      (setq slack-emojify-comp-list
            (let ((invalid-regex (mapconcat #'identity
                                            slack-invalid-emojis
                                            "\\|")))
              (cl-remove-if (lambda (s) (string-match invalid-regex s))
                            (hash-table-keys emojify-emojis))))))

(defun slack-message-add-reaction ()
  (interactive)
  (let* ((word (thing-at-point 'word))
         (ts (get-text-property 0 'ts word))
         (reaction (slack-message-reaction-input))
         (team (slack-team-find slack-current-team-id))
         (room (slack-room-find slack-current-room-id
                                team)))
    (slack-message-reaction-add reaction ts room team)))

(defun slack-message-remove-reaction ()
  (interactive)
  (let* ((team (slack-team-find slack-current-team-id))
         (room (slack-room-find slack-current-room-id
                                team))
         (word (thing-at-point 'word))
         (ts (get-text-property 0 'ts word))
         (msg (slack-room-find-message room ts))
         (reactions (oref msg reactions))
         (reaction (slack-message-reaction-select reactions)))
    (slack-message-reaction-remove reaction ts room team)))

(defun slack-message-show-reaction-users ()
  (interactive)
  (let* ((team (slack-team-find slack-current-team-id))
         (reaction (ignore-errors (get-text-property (point) 'reaction))))
    (if reaction
        (let ((user-names (slack-reaction-user-names reaction team)))
          (message "reacted users: %s" (mapconcat #'identity user-names ", ")))
      (message "Can't get reaction:"))))

(defun slack-message-reaction-select (reactions)
  (let ((list (mapcar #'(lambda (r)
                          (cons (oref r name)
                                (oref r name)))
                      reactions)))
    (slack-select-from-list
     (list "Select Reaction: ")
     selected)))

(defun slack-message-reaction-input ()
  (slack-message-reaction-load-emojify-comp-list)
  (let ((reaction (if (bound-and-true-p slack-emojify-comp-list)
                      (completing-read "Select Emoji: " slack-emojify-comp-list)
                    (read-from-minibuffer "Emoji: "))))
    (if (and (string-prefix-p ":" reaction)
             (string-suffix-p ":" reaction))
        (substring reaction 1 -1)
      reaction)))

(defun slack-message-reaction-add (reaction ts room team)
  (cl-labels ((on-reaction-add
               (&key data &allow-other-keys)
               (slack-request-handle-error
                (data "slack-message-reaction-add"))))
    (slack-request
     slack-message-reaction-add-url
     team
     :type "POST"
     :sync nil
     :params (list (cons "channel" (oref room id))
                   (cons "timestamp" ts)
                   (cons "name" reaction))
     :success #'on-reaction-add)))

(defun slack-message-reaction-remove (reaction ts room team)
  (cl-labels ((on-reaction-remove
               (&key data &allow-other-keys)
               (slack-request-handle-error
                (data "slack-message-reaction-remove"))))
    (slack-request
     slack-message-reaction-remove-url
     team
     :type "POST"
     :sync nil
     :params (list (cons "channel" (oref room id))
                   (cons "timestamp" ts)
                   (cons "name" reaction))
     :success #'on-reaction-remove)))

(cl-defmacro slack-message-find-reaction ((m reaction) &body body)
  `(let ((same-reaction (cl-find-if #'(lambda (r) (slack-reaction-equalp r ,reaction))
                                    (oref ,m reactions))))
     ,@body))

(defmethod slack-message-append-reaction ((m slack-message) reaction)
  (slack-message-find-reaction
   (m reaction)
   (if same-reaction
       (slack-reaction-join same-reaction reaction)
     (push reaction (oref m reactions)))))

(defmethod slack-message-pop-reaction ((m slack-message) reaction)
  (slack-message-find-reaction
   (m reaction)
   (if same-reaction
       (if (eq 1 (oref same-reaction count))
           (with-slots (reactions) m
             (setq reactions
                   (cl-delete-if #'(lambda (r)
                                     (slack-reaction-equalp same-reaction r))
                                 reactions)))
         (cl-decf (oref same-reaction count))))))

(provide 'slack-message-reaction)
;;; slack-message-reaction.el ends here