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;;; mastodon-notifications.el --- Notification functions for mastodon.el -*- lexical-binding: t -*-

;; Copyright (C) 2017-2019 Johnson Denen
;; Copyright (C) 2020-2022 Marty Hiatt
;; Author: Johnson Denen <johnson.denen@gmail.com>
;;         Marty Hiatt <martianhiatus@riseup.net>
;; Maintainer: Marty Hiatt <martianhiatus@riseup.net>
;; Homepage: https://codeberg.org/martianh/mastodon.el

;; This file is not part of GNU Emacs.

;; This file is part of mastodon.el.

;; mastodon.el 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.

;; mastodon.el 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 mastodon.el.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; mastodon-notification.el provides notification functions for Mastodon.

;;; Code:

(eval-when-compile (require 'subr-x))

(autoload 'mastodon-http--api "mastodon-http")
(autoload 'mastodon-http--get-params-async-json "mastodon-http")
(autoload 'mastodon-http--post "mastodon-http")
(autoload 'mastodon-http--triage "mastodon-http")
(autoload 'mastodon-media--inline-images "mastodon-media")
(autoload 'mastodon-tl--byline "mastodon-tl")
(autoload 'mastodon-tl--byline-author "mastodon-tl")
(autoload 'mastodon-tl--clean-tabs-and-nl "mastodon-tl")
(autoload 'mastodon-tl--content "mastodon-tl")
(autoload 'mastodon-tl--field "mastodon-tl")
(autoload 'mastodon-tl--find-property-range "mastodon-tl")
(autoload 'mastodon-tl--has-spoiler "mastodon-tl")
(autoload 'mastodon-tl--init "mastodon-tl")
(autoload 'mastodon-tl--insert-status "mastodon-tl")
(autoload 'mastodon-tl--property "mastodon-tl")
(autoload 'mastodon-tl--reload-timeline-or-profile "mastodon-tl")
(autoload 'mastodon-tl--spoiler "mastodon-tl")
(autoload 'mastodon-tl--item-id "mastodon-tl")
(autoload 'mastodon-tl--update "mastodon-tl")
(autoload 'mastodon-views--view-follow-requests "mastodon-views")
(autoload 'mastodon-tl--current-filters "mastodon-views")
(autoload 'mastodon-tl--render-text "mastodon-tl")
(autoload 'mastodon-notifications-get "mastodon")


(defgroup mastodon-tl nil
  "Nofications in mastodon.el."
  :prefix "mastodon-notifications-"
  :group 'mastodon)

(defcustom mastodon-notifications--profile-note-in-foll-reqs t
  "If non-nil, show a user's profile note in follow request notifications."
  :type '(boolean))

(defcustom mastodon-notifications--profile-note-in-foll-reqs-max-length nil
  "The max character length for user profile note in follow requests.
Profile notes are only displayed if
`mastodon-notifications--profile-note-in-foll-reqs' is non-nil.
If unset, profile notes of any size will be displayed, which may
make them unweildy."
  :type '(integer))

(defcustom mastodon-notifications--images-in-notifs nil
  "Whether to display attached images in notifications."
  :type '(boolean))

(defvar mastodon-tl--buffer-spec)
(defvar mastodon-tl--display-media-p)
(defvar mastodon-mode-map)

(defvar mastodon-notifications--types-alist
  '(("follow" . mastodon-notifications--follow)
    ("favourite" . mastodon-notifications--favourite)
    ("reblog" . mastodon-notifications--reblog)
    ("mention" . mastodon-notifications--mention)
    ("poll" . mastodon-notifications--poll)
    ("follow_request" . mastodon-notifications--follow-request)
    ("status" . mastodon-notifications--status)
    ("update" . mastodon-notifications--edit))
  "Alist of notification types and their corresponding function.")

(defvar mastodon-notifications--response-alist
  '(("Followed" . "you")
    ("Favourited" . "your status from")
    ("Boosted" . "your status from")
    ("Mentioned" . "you")
    ("Posted a poll" . "that has now ended")
    ("Requested to follow" . "you")
    ("Posted" . "a post")
    ("Edited" . "a post from"))
  "Alist of subjects for notification types.")

(defvar mastodon-notifications--map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map mastodon-mode-map)
    (define-key map (kbd "a") #'mastodon-notifications--follow-request-accept)
    (define-key map (kbd "j") #'mastodon-notifications--follow-request-reject)
    (define-key map (kbd "C-k") #'mastodon-notifications--clear-current)
    map)
  "Keymap for viewing notifications.")

(defun mastodon-notifications--byline-concat (message)
  "Add byline for TOOT with MESSAGE."
  (concat " " (propertize message 'face 'highlight)
          " " (cdr (assoc message mastodon-notifications--response-alist))))

(defun mastodon-notifications--follow-request-process (&optional reject)
  "Process the follow request at point.
With no argument, the request is accepted. Argument REJECT means
reject the request. Can be called in notifications view or in
follow-requests view."
  (if (not (mastodon-tl--find-property-range 'item-json (point)))
      (user-error "No follow request at point?")
    (let* ((item-json (mastodon-tl--property 'item-json))
           (f-reqs-view-p (string= "follow_requests"
                                   (plist-get mastodon-tl--buffer-spec 'endpoint)))
           (f-req-p (or (string= "follow_request" (alist-get 'type item-json)) ;notifs
                        f-reqs-view-p)))
      (if (not f-req-p)
          (user-error "No follow request at point?")
        (let-alist (or (alist-get 'account item-json) ;notifs
                       item-json) ;f-reqs
          (if (not .id)
              (user-error "No account result at point?")
            (let ((response
                   (mastodon-http--post
                    (mastodon-http--api
                     (format "follow_requests/%s/%s"
                             .id (if reject "reject" "authorize"))))))
              (mastodon-http--triage
               response
               (lambda (_)
                 (if f-reqs-view-p
                     (mastodon-views--view-follow-requests)
                   (mastodon-tl--reload-timeline-or-profile))
                 (message "Follow request of %s (@%s) %s!"
                          .username .acct (if reject "rejected" "accepted")))))))))))

(defun mastodon-notifications--follow-request-accept ()
  "Accept a follow request.
Can be called in notifications view or in follow-requests view."
  (interactive)
  (mastodon-notifications--follow-request-process))

(defun mastodon-notifications--follow-request-reject ()
  "Reject a follow request.
Can be called in notifications view or in follow-requests view."
  (interactive)
  (mastodon-notifications--follow-request-process :reject))

(defun mastodon-notifications--comment-note-text (str)
  "Add comment face to all text in STR with `shr-text' face only."
  (with-temp-buffer
    (insert str)
    (goto-char (point-min))
    (let (prop)
      (while (setq prop (text-property-search-forward 'face 'shr-text t))
        (add-text-properties (prop-match-beginning prop)
                             (prop-match-end prop)
                             '(face (font-lock-comment-face shr-text)))))
    (buffer-string)))

(defvar mastodon-notifications-grouped-types
  '(follow boost favourite)
  "List of notification types for which grouping is implemented.")

(defvar mastodon-notifications--action-alist
  '((reblog . "Boosted")
    (favourite . "Favourited")
    (follow_request . "Requested to follow")
    (follow . "Followed")
    (mention . "Mentioned")
    (status . "Posted")
    (poll . "Posted a poll")
    (update . "Edited"))
  "Action strings keyed by notification type.
Types are those of the Mastodon API.")

(defun mastodon-notifications--alist-by-value (str field json)
  "From JSON, return the alist whose FIELD value matches STR.
JSON is a list of alists."
  (cl-some (lambda (y)
             (when (string= str (alist-get field y))
               y))
           json))

(defun mastodon-notifications--group-accounts (ids json)
  "For IDS, return account data in JSON."
  (cl-loop
   for x in ids
   collect (mastodon-notifications--alist-by-value x 'id json)))

(defun mastodon-notifications--format-note (group status accounts)
  "Format for a GROUP notification.
JSON is the full notifications JSON."
  ;; FIXME: apply/refactor filtering as per/with `mastodon-tl--toot'
  (let-alist group
    ;; .sample_account_ids .status_id .notifications_count
    ;; .most_recent_notifiation_id
    (let* ((type .type)
           (type-sym (intern .type))
           (profile-note
            (when (eq type-sym 'follow-request)
              (let ((str (mastodon-tl--field
                          'note
                          (car accounts))))
                (if mastodon-notifications--profile-note-in-foll-reqs-max-length
                    (string-limit str mastodon-notifications--profile-note-in-foll-reqs-max-length)
                  str))))
           (follower (car .sample_account_ids))
           (filtered (mastodon-tl--field 'filtered status)) ;;toot))
           (filters (when filtered
                      (mastodon-tl--current-filters filtered))))
      (if (and filtered (assoc "hide" filters))
          nil
        (mastodon-tl--insert-status
         ;; toot
         (if (member type-sym '(follow follow_request))
             ;; Using reblog with an empty id will mark this as something
             ;; non-boostable/non-favable.
             (cons '(reblog (id . nil)) status) ;;note))
           ;; reblogs/faves use 'note' to process their own json not the
           ;; toot's. this ensures following etc. work on such notifs
           status) ;; FIXME: fix following on these notifs
         ;; body
         (let ((body (if-let ((match (assoc "warn" filters)))
                         (mastodon-tl--spoiler toot (cadr match))
                       (mastodon-tl--clean-tabs-and-nl
                        (if (mastodon-tl--has-spoiler status)
                            (mastodon-tl--spoiler status)
                          (if (eq type 'follow-request)
                              (mastodon-tl--render-text profile-note)
                            (mastodon-tl--content status)))))))
           (cond ((eq type-sym 'follow)
                  (propertize "Congratulations, you have a new follower!"
                              'face 'default))
                 ((eq type-sym 'follow-request)
                  (concat
                   (propertize
                    (format "You have a follow request from... %s"
                            follower)
                    'face 'default)
                   (when mastodon-notifications--profile-note-in-foll-reqs
                     (concat
                      ":\n"
                      (mastodon-notifications--comment-note-text body)))))
                 ((member type-sym '(favourite boost))
                  (mastodon-notifications--comment-note-text body))
                 (t body)))
         ;; author-byline
         (lambda (&rest _args)
           (mastodon-notifications--byline-account accounts status))
         ;; action-byline
         (lambda (_status)
           (mastodon-notifications--byline-concat
            (alist-get type-sym mastodon-notifications--action-alist)))
         .status_id
         ;; base toot
         (when (member type-sym '(favourite boost))
           status)
         nil nil nil nil
         nil group))))) ;; insert status still needs our group data

;; FIXME: REFACTOR with -tl--byline:
;; we provide account directly, rather than let-alisting toot
;; almost everything is .account.field anyway
;; but toot still needed also, for attachments, etc.
(defun mastodon-notifications--byline-account
    (accounts toot &optional avatar domain)
  "Propertize author byline ACCOUNT for TOOT, the item responded to.
With arg AVATAR, include the account's avatar image.
When DOMAIN, force inclusion of user's domain in their handle."
  (cl-loop
   for account in accounts
   concat
   (let-alist account
     (concat
      ;; avatar insertion moved up to `mastodon-tl--byline' by default to
      ;; be outside 'byline propt.
      (when (and avatar ; used by `mastodon-profile--format-user'
                 mastodon-tl--show-avatars
                 mastodon-tl--display-media-p
                 (mastodon-tl--image-trans-check))
        (mastodon-media--get-avatar-rendering .avatar))
      ;; username:
      (propertize (if (not (string-empty-p .display_name))
                      .display_name
                    .username)
                  'face 'mastodon-display-name-face
                  ;; enable playing of videos when point is on byline:
                  'attachments (mastodon-tl--get-attachments-for-byline toot)
                  'keymap mastodon-tl--byline-link-keymap
                  ;; echo faves count when point on post author name:
                  ;; which is where --goto-next-toot puts point.
                  'help-echo
                  ;; but don't add it to "following"/"follows" on profile views:
                  ;; we don't have a tl--buffer-spec yet:
                  (unless (or (string-suffix-p "-followers*" (buffer-name))
                              (string-suffix-p "-following*" (buffer-name)))
                    (mastodon-tl--format-byline-help-echo toot)))
      ;; handle:
      " ("
      (propertize (concat "@" .acct
                          (when domain
                            (concat "@"
                                    (url-host
                                     (url-generic-parse-url .url)))))
                  'face 'mastodon-handle-face
                  'mouse-face 'highlight
	          'mastodon-tab-stop 'user-handle
                  'account account
	          'shr-url .url
	          'keymap mastodon-tl--link-keymap
                  'mastodon-handle (concat "@" .acct)
	          'help-echo (concat "Browse user profile of @" .acct))
      ")"
      (if (< 1 (length accounts)) "\n" "")))))

(defun mastodon-notifications--by-type (groups json)
  "Filter NOTE for those listed in `mastodon-notifications--types-alist'.
Call its function in that list on NOTE."
  (setq masto-grouped-notifs json)
  (cl-loop
   for g in groups
   for start-pos = (point)
   for accounts = (mastodon-notifications--group-accounts
                   (alist-get 'sample_account_ids g)
                   (alist-get 'accounts json))
   for status = (mastodon-notifications--alist-by-value
                 (alist-get 'status_id g) 'id
                 (alist-get 'statuses json))
   do (mastodon-notifications--format-note g status accounts)
   (when mastodon-tl--display-media-p
     ;; images-in-notifs custom is handeld in
     ;; `mastodon-tl--media-attachment', not here
     (mastodon-media--inline-images start-pos (point)))))

(defun mastodon-notifications--timeline (json)
  "Format JSON in Emacs buffer."
  (if (seq-empty-p json)
      (user-error "Looks like you have no (more) notifications for now")
    (let ((groups (alist-get 'notification_groups json)))
      ;; (mapc (lambda (x)
      (mastodon-notifications--by-type groups json)
      ;; grouped)
      (goto-char (point-min)))))

(defun mastodon-notifications--get-mentions ()
  "Display mention notifications in buffer."
  (interactive)
  (mastodon-notifications-get "mention" "mentions"))

(defun mastodon-notifications--get-favourites ()
  "Display favourite notifications in buffer."
  (interactive)
  (mastodon-notifications-get "favourite" "favourites"))

(defun mastodon-notifications--get-boosts ()
  "Display boost notifications in buffer."
  (interactive)
  (mastodon-notifications-get "reblog" "boosts"))

(defun mastodon-notifications--get-polls ()
  "Display poll notifications in buffer."
  (interactive)
  (mastodon-notifications-get "poll" "polls"))

(defun mastodon-notifications--get-statuses ()
  "Display status notifications in buffer.
Status notifications are created when you call
`mastodon-tl--enable-notify-user-posts'."
  (interactive)
  (mastodon-notifications-get "status" "statuses"))

(defun mastodon-notifications--filter-types-list (type)
  "Return a list of notification types with TYPE removed."
  (let ((types (mapcar #'car mastodon-notifications--types-alist)))
    (remove type types)))

(defun mastodon-notifications--clear-all ()
  "Clear all notifications."
  (interactive)
  (when (y-or-n-p "Clear all notifications?")
    (let ((response
           (mastodon-http--post (mastodon-http--api "notifications/clear"))))
      (mastodon-http--triage
       response (lambda (_)
                  (when mastodon-tl--buffer-spec
                    (mastodon-tl--reload-timeline-or-profile))
                  (message "All notifications cleared!"))))))

(defun mastodon-notifications--clear-current ()
  "Dismiss the notification at point."
  (interactive)
  (let* ((id (or (mastodon-tl--property 'item-id)
                 (mastodon-tl--field 'id
                                     (mastodon-tl--property 'item-json))))
         (response
          (mastodon-http--post (mastodon-http--api
                                (format "notifications/%s/dismiss" id)))))
    (mastodon-http--triage
     response (lambda (_)
                (when mastodon-tl--buffer-spec
                  (mastodon-tl--reload-timeline-or-profile))
                (message "Notification dismissed!")))))

(defun mastodon-notifications--get-unread-count ()
  "Return the number of unread notifications for the current account."
  ;; params: limit - max 1000, default 100, types[], exclude_types[], account_id
  (let* ((endpoint "notifications/unread_count")
         (url (mastodon-http--api endpoint))
         (resp (mastodon-http--get-json url)))
    (alist-get 'count resp)))

(provide 'mastodon-notifications)
;;; mastodon-notifications.el ends here