;;; jao-mpc-random-album.el --- random mpc albums    -*- lexical-binding: t; -*-

;; Copyright (C) 2021  jao

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

;; 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/>.

;;; Commentary:

;; Simple mpd control using elmpd and mpc.

;;; Code:

(require 'elmpd)
(require 'jao-minibuffer)
(require 'jao-lyrics)

(defvar jao-mpc--connection nil)
(defvar-local jao-mpc--local-connecton nil)
(defvar-local jao-mpc--local-port nil)

(defvar jao-mpc-host "localhost")
(defvar jao-mpc-port 6600)

(defun jao-mpc-disconnect ()
  (interactive)
  (when jao-mpc--connection
    (delete-process (elmpd-connection--fd jao-mpc--connection))
    (setq jao-mpc--connection nil)))

(defun jao-mpc--connect (name &optional cb)
  (elmpd-connect :name name
                 :host jao-mpc-host
                 :port jao-mpc-port
                 :subsystems
                 (when cb `((player) . ,cb))))

(defun jao-mpc-connect (&optional force)
  (interactive)
  (when force (jao-mpc-disconnect))
  (unless jao-mpc--connection
    (setq jao-mpc--connection (jao-mpc--connect "jao-mpc" 'jao-mpc--watcher))
    (jao-mpc--watcher jao-mpc--connection 'player))
  jao-mpc--connection)

(defun jao-mpc--send (cmd cb)
  (elmpd-send jao-mpc--connection cmd cb ))

(defvar jao-mpc--play-status '())
(defvar jao-mpc--current '())
(defvar jao-mpc-minibuffer-str "")

(defun jao-mpc--parse-retort (txt)
  (let (res)
    (dolist (e (split-string txt "\n" t " ") res)
      (let ((e (split-string e ": " t " ")))
        (when (and (car e) (cadr e))
          (push (cons (car e) (cadr e)) res))))))

(defun jao-mpc--update-status (next)
  (let ((cb (lambda (_c ok txt)
              (when ok
                (setq jao-mpc--play-status (jao-mpc--parse-retort txt))
                (when next (funcall next))))))
    (jao-mpc--send "status" cb)))

(defun jao-mpc--current-get (x &optional def)
  (alist-get x jao-mpc--current def nil #'string=))

(defun jao-mpc--status-get (x &optional def)
  (alist-get x jao-mpc--play-status def nil #'string=))

(defun jao-mpc--playing-p ()
  (string= (jao-mpc--status-get "state" "") "play"))

(defun jao-mpc--current-str ()
  (let ((title (jao-mpc--current-get "Title"))
        (album (jao-mpc--current-get "Album"))
        (no (string-to-number (jao-mpc--current-get "Track" "0")))
        (len (string-to-number (jao-mpc--status-get "playlistlength" "1")))
        (artist (jao-mpc--current-get "Artist"))
        (composer (jao-mpc--current-get "Composer")))
    (format " %s%s %s%s%s"
            (jao--put-face (if (zerop no) "" (format "%02d/%s " no len))
                           'jao-themes-f02)
            (jao--put-face title 'jao-themes-f00)
            (jao--put-face artist 'jao-themes-f01)
            (jao--put-face (if composer (format " [%s]" composer) "")
                           'jao-themes-f01)
            (jao--put-face (if album (format " (%s)" album) "") 'jao-themes-f11))))

(defun jao-mpc--update-minibuffer ()
  (setq jao-mpc-minibuffer-str
        (if (jao-mpc--playing-p) (jao-mpc--current-str) ""))
  (jao-minibuffer-refresh))

(defun jao-mpc--update-current (&optional next)
  (let ((cb (lambda (_c ok txt)
              (when ok
                (setq jao-mpc--current (jao-mpc--parse-retort txt))
                (jao-mpc--update-minibuffer)
                (when next (funcall next))))))
    (jao-mpc--send "currentsong" cb)))

(defun jao-mpc--watcher (_conn _subsys)
  (jao-mpc--update-status #'jao-mpc--update-current))



(defconst jao-mpc--albums "*MPC Albums*")
(defconst jao-mpc--playlist "*MPC Playlist*")

(define-derived-mode jao-mpc-albums-mode fundamental-mode "MPC Albums"
  "Mode to display the list of albums known by mpd."
  (read-only-mode -1)
  (delete-region (point-min) (point-max))
  (insert (shell-command-to-string "mpc list album"))
  (goto-char (point-min))
  (read-only-mode 1))

(define-key jao-mpc-albums-mode-map (kbd "n") #'next-line)
(define-key jao-mpc-albums-mode-map (kbd "p") #'previous-line)
(define-key jao-mpc-albums-mode-map (kbd "RET") #'jao-mpc-add-and-play)
(define-key jao-mpc-albums-mode-map (kbd "q") #'bury-buffer)

(defun jao-mpc--album-buffer ()
  (if-let (b (get-buffer jao-mpc--albums))
      b
    (with-current-buffer (get-buffer-create jao-mpc--albums)
      (jao-mpc-albums-mode)
      (current-buffer))))

(defun jao-mpc--add-and-play (&optional album)
  (interactive)
  (let* ((album (or album (string-trim (thing-at-point 'line))))
         (cmd (format "mpc findadd album \"%s\" && mpc play" album)))
    (shell-command-to-string "mpc clear")
    (shell-command-to-string cmd)))

(define-derived-mode jao-mpc-playlist-mode fundamental-mode "MPC Playlist"
  "Mode to display the list of playlist known by mpd."
  (read-only-mode -1)
  (delete-region (point-min) (point-max))
  (insert (shell-command-to-string (format "mpc -p %s playlist" jao-mpc-port)))
  (goto-char (point-min))
  (display-line-numbers-mode)
  (read-only-mode 1))

(defun jao-mpc--playlist-goto-current ()
  (interactive)
  (let ((jao-mpc--connection
         (or jao-mpc--local-connecton jao-mpc--local-connecton)))
    (jao-mpc--update-current
     (lambda ()
       (when-let (no (string-to-number (jao-mpc--current-get "Pos")))
         (goto-char (point-min))
         (forward-line no))))))

(defun jao-mpc--playlist-play ()
  (interactive)
  (shell-command-to-string (format "mpc -p %s play %s"
                                   (or jao-mpc--local-port jao-mpc-port)
                                   (line-number-at-pos))))

(define-key jao-mpc-playlist-mode-map (kbd "n") #'next-line)
(define-key jao-mpc-playlist-mode-map (kbd "p") #'previous-line)
(define-key jao-mpc-playlist-mode-map (kbd "q") #'bury-buffer)
(define-key jao-mpc-playlist-mode-map (kbd ".") #'jao-mpc--playlist-goto-current)
(define-key jao-mpc-playlist-mode-map (kbd "RET") #'jao-mpc--playlist-play)

(defun jao-mpc--playlist-buffer ()
  (with-current-buffer (get-buffer-create jao-mpc--playlist)
    (jao-mpc-playlist-mode)
    (current-buffer)))

;;;###autoload
(defun jao-mpc-stop ()
  (interactive)
  (shell-command-to-string "mpc stop"))

;;;###autoload
(defun jao-mpc-toggle ()
  (interactive)
  (jao-mpc--send "pause" nil))

;;;###autoload
(defun jao-mpc-play ()
  (interactive)
  (jao-mpc--send "play" nil))

;;;###autoload
(defun jao-mpc-next ()
  (interactive)
  (jao-mpc--send "next" nil))

;;;###autoload
(defun jao-mpc-previous ()
  (interactive)
  (jao-mpc--send "previous" nil))

;;;###autoload
(defun jao-mpc-clear ()
  (interactive)
  (jao-mpc--send "clear" nil))

;;;###autoload
(defun jao-mpc-echo-current ()
  (interactive)
  (jao-notify (jao-mpc--current-str)))

;;;###autoload
(defun jao-mpc-show-albums ()
  "Show album list."
  (interactive)
  (pop-to-buffer (jao-mpc--album-buffer)))

;;;###autoload
(defun jao-mpc-show-playlist ()
  "Show current playlist."
  (interactive)
  (pop-to-buffer (jao-mpc--playlist-buffer))
  (setq-local jao-mpc--local-connecton jao-mpc--connection
              jao-mpc--local-port jao-mpc-port)
  (jao-mpc--playlist-goto-current))

;;;###autoload
(defun jao-mpc-lyrics-track-data ()
  (when-let* ((title (jao-mpc--current-get "Title"))
              (artist (jao-mpc--current-get "Artist")))
    (cons (substring-no-properties title) (substring-no-properties artist))))

;;;###autoload
(defun jao-mpc-setup ()
  (setq jao-lyrics-info-function #'jao-mpc-lyrics-track-data)
  (jao-random-album-setup #'jao-mpc--album-buffer
                          #'jao-mpc--add-and-play
                          #'jao-mpc-stop)
  (jao-mpc-connect)
  (jao-minibuffer-add-msg-variable 'jao-mpc-minibuffer-str 1))

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