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;;; slack-stars-buffer.el ---                        -*- lexical-binding: t; -*-

;; Copyright (C) 2017  南優也

;; Author: 南優也 <yuyaminami@minamiyuuya-no-MacBook.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 'eieio)
(require 'slack-util)
(require 'slack-team)
(require 'slack-buffer)

(define-derived-mode slack-stars-buffer-mode slack-buffer-mode "Slack Stars Buffer")

(defclass slack-stars-buffer (slack-buffer)
  ((oldest :type string :initform "")))

(defmethod slack-buffer-name :static ((_class slack-stars-buffer) team)
  (format "*Slack - %s : Stars*" (oref team name)))

(defmethod slack-buffer-name ((this slack-stars-buffer))
  (slack-buffer-name 'slack-stars-buffer (oref this team)))

(defmethod slack-buffer-find :static ((class slack-stars-buffer) team)
  (slack-if-let* ((buf (cl-find-if #'(lambda (e) (string= (buffer-name e)
                                                    (slack-buffer-name class team)))
                             (slot-value team class))))
      (with-current-buffer buf slack-current-buffer)))

(defmethod slack-buffer-insert ((this slack-stars-buffer) item &optional not-tracked-p)
  (let ((lui-time-stamp-time (seconds-to-time
                              (string-to-number
                               (slack-ts
                                (slack-star-item-message item))))))
    (lui-insert-with-text-properties
     (slack-to-string item (oref this team))
     'ts (slack-ts item)
     'not-tracked-p not-tracked-p)
    (lui-insert "" t)))

(defmethod slack-buffer-has-next-page-p ((this slack-stars-buffer))
  (with-slots (team) this
    (slack-star-has-next-page-p (oref team star))))

(defmethod slack-buffer-insert-history ((this slack-stars-buffer))
  (with-slots (team) this
    (let ((items (slack-star-items (oref team star)))
          (before-oldest (oref this oldest)))
      (oset this oldest (slack-ts (car items)))
      (cl-loop for item in items
               do (and (string< (slack-ts item) before-oldest)
                       (slack-buffer-insert this item t)))

      (slack-if-let* ((point (slack-buffer-ts-eq (point-min)
                                           (point-max)
                                           before-oldest)))
          (goto-char point)))))

(defmethod slack-buffer-request-history ((this slack-stars-buffer) after-success)
  (with-slots (team) this
    (slack-stars-list-request team
                              (slack-next-page (oref (oref team star) paging))
                              after-success)))


(defmethod slack-buffer-update-oldest ((this slack-stars-buffer) item)
  (when (string< (oref this oldest) (slack-ts item))
    (oset this oldest (slack-ts item))))

(defmethod slack-buffer-init-buffer ((this slack-stars-buffer))
  (let* ((buf (generate-new-buffer (slack-buffer-name this)))
         (star (oref (oref this team) star))
         (items (slack-star-items star))
         (oldest-message (car items)))
    (when oldest-message
      (slack-buffer-update-oldest this oldest-message))
    (with-current-buffer buf
      (slack-stars-buffer-mode)
      (slack-buffer-set-current-buffer this)
      (slack-buffer-insert-load-more this)
      (with-slots (star) (oref this team)
        (cl-loop for m in (oref star items)
                 do (slack-buffer-insert this m)))
      (goto-char (point-max)))
    (unless (oref (oref this team) slack-stars-buffer)
      (push buf (oref (oref this team) slack-stars-buffer)))
    buf))

(defun slack-create-stars-buffer (team)
  (slack-if-let* ((buf (slack-buffer-find 'slack-stars-buffer team)))
      buf
    (make-instance 'slack-stars-buffer
                   :team team)))

(defmethod slack-buffer-remove-star ((this slack-stars-buffer) ts)
  (with-slots (team) this
    (with-slots (star) team
      (slack-star-remove-star star ts team))))

(defmethod slack-buffer-message-delete ((this slack-stars-buffer) ts)
  (let ((buffer (slack-buffer-buffer this))
        (inhibit-read-only t))
    (with-current-buffer buffer
      (slack-if-let* ((beg (slack-buffer-ts-eq (point-min) (point-max) ts))
                      (end (next-single-property-change beg 'ts)))
          (delete-region beg end)))))

(provide 'slack-stars-buffer)
;;; slack-stars-buffer.el ends here