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;;; jao-afio.el --- workspaces in just one frame  -*- lexical-binding: t; -*-

;; Copyright (C) 2020, 2021, 2022  jao

;; Author: jao <mail@jao.io>
;; Keywords: frames

;; 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/>.

;;; initialisation
(require 'cl-lib)
(require 'jao-doc-session)

(defvar jao-afio-use-frames (not window-system))

(defvar jao-open-doc-fun 'find-file)
(defvar jao-afio-mail-function 'gnus)
(defvar jao-afio-use-w3m nil)
(defvar jao-afio-switch-hook nil)

(defvar jao-afio--configs '(?c ?w ?g ?p ?s))
(defvar jao-afio--previous-config (car jao-afio--configs))

(defun jao-afio--current-config (&optional c f)
  (when c (modify-frame-parameters f `((afio . ,c))))
  (frame-parameter f 'afio))

(defun jao-afio--init (&optional f)
  (interactive)
  (jao-afio--current-config ?c)
  (if jao-afio-use-frames
      (set-frame-name "W1")
    (window-configuration-to-register ?c)))

(defun jao-afio--check-frame ()
  (unless (jao-afio--current-config)
    (jao-afio--init (window-frame (get-buffer-window (current-buffer))))))

;;; session openers
;;;###autoload
(defun jao-afio-open-pdf-session (&optional docs)
  (interactive)
  (let ((jao-doc-session-inhibit-save t))
    (dolist (doc (or docs (jao-doc-session)))
      (when (file-exists-p doc)
        (if (jao-pdf-is-pdf-file doc) (jao-open-doc doc) (find-file doc))
        (other-window 1)))
    (other-window 1)))

(defun jao-afio-open-doc ()
  (interactive)
  (delete-other-windows)
  (split-window-right)
  (let ((docs (cl-remove-if-not 'jao-doc-session-is-doc (buffer-list))))
    (if (car docs)
        (progn (switch-to-buffer (car docs))
               (switch-to-buffer-other-window (or (cadr docs) (car docs))))
      (when-let (docs (jao-doc-session))
        (when (y-or-n-p (format "Load saved session? (%d docs)" (length docs)))
          (jao-afio-open-pdf-session docs))))))

(declare-function w3m "w3m")
(declare-function notmuch "notmuch")
(declare-function jao-eww-session-eww-buffers "jao-eww-session")
(declare-function jao-eww-session-load "jao-eww-session")

(defun jao-afio--open-eww-session ()
  (if-let (b (jao-eww-session-eww-buffers))
      (switch-to-buffer (car b))
    (jao-eww-session-load)))

;;;###autoload
(defun jao-afio-open-www ()
  (interactive)
  (require 'jao-eww-session)
  (if (< (frame-width) 160)
      (if jao-afio-use-w3m (w3m) (jao-afio--open-eww-session))
    (delete-other-windows)
    (split-window-right)
    (if jao-afio-use-w3m
        (w3m)
      (jao-afio--open-eww-session)
      (let ((b (current-buffer)))
        (other-window 1)
        (switch-to-buffer (car (jao-eww-session-eww-buffers b)))
        (other-window 1)))))

;;;###autoload
(defun jao-afio-open-gnus ()
  (interactive)
  (delete-other-windows)
  (org-agenda-list)
  (calendar)
  (find-file (expand-file-name "inbox.org" org-directory))
  (gnus)
  (jao-gnus--set-summary-line))

(defun jao-afio--mail-sidebar ()
  (other-window 1)
  (delete-other-windows-vertically)
  (find-file (expand-file-name "inbox.org" org-directory))
  (split-window-below (/ (window-height) 3))
  (other-window 1)
  (org-agenda-list)
  (split-window-below -9)
  (other-window 1)
  (switch-to-buffer "*Calendar*")
  (other-window 1))

;;;###autoload
(defun jao-afio-open-notmuch ()
  (interactive)
  (delete-other-windows)
  (split-window-horizontally -80)
  (notmuch)
  (jao-afio--mail-sidebar))

(defun jao-afio-open-mail-function ()
  (interactive)
  (jao-trisect)
  (other-window 2)
  (delete-window)
  (other-window 1)
  (funcall jao-afio-mail-function)
  (jao-afio--mail-sidebar))

;;;###autoload
(defun jao-afio-open-mail ()
  (interactive)
  (unless (get-buffer "*Calendar*") (calendar))
  (cond ((eq 'gnus jao-afio-mail-function) (jao-afio-open-gnus))
        ((eq 'notmuch jao-afio-mail-function) (jao-afio-open-notmuch))
        (jao-afio-open-mail-function (jao-afio-open-mail-function))))

;;;###autoload
(defun jao-afio-reset ()
  (interactive)
  (delete-other-windows)
  (cl-case (jao-afio--current-config)
    (?w (jao-afio-open-www))
    (?g (jao-afio-open-mail))
    (?p (jao-afio-open-doc))
    (?s (delete-other-windows))))

;;; go to frame
(defsubst jao-afio--find-frame (c)
  (seq-find (lambda (f) (eq (jao-afio--current-config nil f) c)) (frame-list)))

(defun jao-afio-frame-name (&optional c)
  (alist-get (or c (jao-afio--current-config))
             '((?c . "main") (?s . "scratch") (?g . "mail")
               (?p . "docs") (?w . "web"))))

(defun jao-afio-frame-no (&optional c)
  (alist-get (or c (jao-afio--current-config))
             '((?s . 0) (?c . 1) (?g . 2) (?w . 3) (?p . 4))))

(defun jao-afio--goto-frame (next &optional reset)
  (jao-afio--check-frame)
  (let ((current (jao-afio--current-config)))
    (if (and (eq next current)
             (not reset)
             (not (eq current jao-afio--previous-config)))
        (jao-afio--goto-frame jao-afio--previous-config)
      (when (or reset (not (eq next current)))
        (if jao-afio-use-frames
            (let ((f (jao-afio--find-frame next)))
              (select-frame-set-input-focus (or f (make-frame)))
              (when (setq reset (or reset (not f)))
                (set-frame-name (format "W%s" (or (jao-afio-frame-no next) next)))))
          (window-configuration-to-register (jao-afio--current-config))
          (when (and (not reset) (get-register next)) (jump-to-register next)))
        (jao-afio--current-config next)
        (unless (eq current next) (setq jao-afio--previous-config current))
        (when reset (jao-afio-reset))
        (run-hooks 'jao-afio-switch-hook)))))

(defun jao-afio-goto-main (&optional reset)
  (interactive "P")
  (jao-afio--goto-frame ?c reset))

(defun jao-afio-goto-mail (&optional reset)
  (interactive "P")
  (jao-afio--goto-frame ?g reset))

(defun jao-afio-goto-docs (&optional reset)
  (interactive "P")
  (jao-afio--goto-frame ?p reset))

(defun jao-afio-goto-www (&optional reset)
  (interactive "P")
  (jao-afio--goto-frame ?w reset))

(defun jao-afio-toggle ()
  (interactive)
  (jao-afio--goto-frame jao-afio--previous-config))

(defun jao-afio-goto-scratch (&optional one-win)
  (interactive "P")
  (jao-afio--goto-frame ?s nil)
  (when one-win (delete-other-windows)))

;;;###autoload
(defun jao-afio-goto-nth (n)
  (cl-case n
    ((1) (jao-afio-goto-main))
    ((2) (jao-afio-goto-mail))
    ((3) (jao-afio-goto-www))
    ((4) (jao-afio-goto-docs))
    ((5) (jao-afio-goto-scratch t))
    ((0) (jao-afio-goto-scratch))))

;;; setup
;;;###autoload
(defun jao-afio-setup (&optional use-frames)
  (global-set-key "\C-cf" 'jao-afio-goto-main)
  (global-set-key "\C-cg" 'jao-afio-goto-mail)
  (global-set-key "\C-cw" 'jao-afio-goto-www)
  (global-set-key "\C-cz" 'jao-afio-goto-docs)
  (setq jao-afio-use-frames use-frames)
  (jao-afio--init))

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