;;; slack.el --- slack client for emacs              -*- lexical-binding: t; -*-

;; Copyright (C) 2015  yuya.minami

;; Author: yuya.minami <yuya.minami@yuyaminami-no-MacBook-Pro.local>
;; Keywords: tools
;; Version: 0.0.2
;; Package-Requires: ((websocket "1.5") (request "0.2.0") (oauth2 "0.10") (circe "2.3") (alert "1.2") (emojify "0.4") (emacs "24.3"))
;; 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 'cl-lib)
(require 'oauth2)

(require 'slack-team)
(require 'slack-channel)
(require 'slack-im)
(require 'slack-file)
(require 'slack-message-notification)
(require 'slack-message-sender)
(require 'slack-message-editor)
(require 'slack-message-reaction)
(require 'slack-user-message)
(require 'slack-bot-message)
(require 'slack-search)
(require 'slack-reminder)

(require 'slack-websocket)
(require 'slack-request)

(defgroup slack nil
  "Emacs Slack Client"
  :prefix "slack-"
  :group 'tools)

(defcustom slack-redirect-url "http://localhost:8080"
  "Redirect url registered for Slack.")
(defcustom slack-buffer-function #'switch-to-buffer-other-window
  "Function to print buffer.")

(defvar slack-use-register-team-string
  "use `slack-register-team' instead.")

(defcustom slack-client-id nil
  "Client ID provided by Slack.")
(make-obsolete-variable
 'slack-client-id slack-use-register-team-string
 "0.0.2")
(defcustom slack-client-secret nil
  "Client Secret Provided by Slack.")
(make-obsolete-variable
 'slack-client-secret slack-use-register-team-string
 "0.0.2")
(defcustom slack-token nil
  "Slack token provided by Slack.
set this to save request to Slack if already have.")
(make-obsolete-variable
 'slack-token slack-use-register-team-string
 "0.0.2")
(defcustom slack-room-subscription '()
  "Group or Channel list to subscribe notification."
  :group 'slack)
(make-obsolete-variable
 'slack-room-subscription slack-use-register-team-string
 "0.0.2")
(defcustom slack-typing-visibility 'frame
  "When to show typing indicator.
frame means typing slack buffer is in the current frame, show typing indicator.
buffer means typing slack buffer is the current buffer, show typing indicator.
never means never show typing indicator."
  :type '(choice (const frame)
                 (const buffer)
                 (const never)))

(defconst slack-oauth2-authorize "https://slack.com/oauth/authorize")
(defconst slack-oauth2-access "https://slack.com/api/oauth.access")
(defconst slack-authorize-url "https://slack.com/api/rtm.start")

(defvar slack-authorize-requests nil)
(defun slack-authorize (team &optional error-callback)
  (cl-labels
      ((abort-previous () (cl-loop for r in (reverse slack-authorize-requests)
                                   do (request-abort r))))
    (setq slack-authorize-requests nil)
    (let ((request (slack-request
                    slack-authorize-url
                    team
                    :success (cl-function (lambda (&key data &allow-other-keys)
                                            (slack-on-authorize data team)))
                    :sync nil
                    :error error-callback)))
      (push request slack-authorize-requests))))

(defun slack-update-team (data team)
  (cl-labels
      ((create-rooms
        (datum team class)
        (mapcar #'(lambda (data)
                    (slack-room-create data team class))
                (append datum nil))))
    (let ((self (plist-get data :self))
          (team-data (plist-get data :team)))
      (oset team id (plist-get team-data :id))
      (oset team name (plist-get team-data :name))
      (oset team channels
            (create-rooms (plist-get data :channels)
                          team 'slack-channel))
      (oset team groups
            (create-rooms (plist-get data :groups)
                          team 'slack-group))
      (oset team ims
            (create-rooms (plist-get data :ims)
                          team 'slack-im))
      (oset team self self)
      (oset team self-id (plist-get self :id))
      (oset team self-name (plist-get self :name))
      (oset team users (append (plist-get data :users) nil))
      (oset team bots (append (plist-get data :bots) nil))
      (oset team ws-url (plist-get data :url))
      (oset team connected t)
      team)))

(cl-defun slack-on-authorize (data team)
  (slack-request-handle-error
   (data "slack-authorize")
   (message "Slack Authorization Finished - %s"
            (oref team name))
   (let ((team (slack-update-team data team)))
     (with-slots (groups ims channels) team
       (cl-loop for room in (append groups ims channels)
                do (let ((bufname (slack-room-buffer-name room)))
                     (when (get-buffer bufname)
                       (kill-buffer bufname)))))
     (slack-ws-open team))))

(defun slack-on-authorize-e
    (&key error-thrown &allow-other-keys &rest_)
  (error "slack-authorize: %s" error-thrown))

(defun slack-oauth2-auth (team)
  (with-slots (client-id client-secret) team
    (oauth2-auth
     slack-oauth2-authorize
     slack-oauth2-access
     client-id
     client-secret
     "client"
     nil
     slack-redirect-url)))

(defun slack-request-token (team)
  (with-slots (token) team
    (setq token
          (oauth2-token-access-token
           (slack-oauth2-auth team)))))

;;;###autoload
(defun slack-start (&optional team)
  (interactive)
  (cl-labels ((start
               (team)
               (with-slots (ws-conn token) team
                 (if ws-conn
                     (slack-ws-close team))
                 (unless token
                   (slack-request-token team)))
               (slack-authorize team)))
    (if team
        (start team)
      (if slack-teams
          (cl-loop for team in slack-teams
                   do (start team))
        (slack-start (call-interactively #'slack-register-team))))))

(provide 'slack)
;;; slack.el ends here