;;; db-emms.el -- EMMS configuration -*- lexical-binding: t -*-

;;; Commentary:

;;; Code:

(declare-function emms-shuffle "emms")
(declare-function emms-mode-line "emms-mode-line")
(declare-function emms-playlist-new "emms")
(declare-function emms-stop "emms")
(declare-function emms-playlist-set-playlist-buffer "emms")
(declare-function emms-playlist-current-clear "emms")
(declare-function emms-playlist-current-insert-source "emms")
(declare-function emms-playlist-select-first "emms")
(declare-function emms-start "emms")
(declare-function emms-track-get "emms")
(declare-function emms-track-simple-description "emms")
(declare-function emms-playlist-ensure-playlist-buffer "emms")
(declare-function emms-propertize "emms-compat")
(declare-function emms-track-force-description "emms")
(declare-function emms-playlist-selected-track-at-p "emms")
(declare-function emms-playlist-mode-overlay-selected "emms-playlist-mode")
(declare-function emms-track-description "emms")
(declare-function emms-playlist-current-selected-track "emms")
(declare-function emms-next "emms")
(declare-function emms-previous "emms")
(declare-function emms-pause "emms")
(declare-function emms-show "emms")
(declare-function emms "emms-playlist-mode")
(declare-function emms-cache-save "emms-cache")
(declare-function string-remove-prefix "subr-x")
(declare-function emms-with-inhibit-read-only-t "emms")


;; Custom file finder

(defun db/emms-source-file-directory-tree-find (dir regex)
  "Return a list of all files under DIR that match REGEX.
This function uses the external find utility.  The name for GNU
find may be supplied using `emms-source-file-gnu-find'.

Difference to original `emms-source-file-directory-tree-find’ is
that we also follow symbolic links."
  (with-temp-buffer
    (call-process emms-source-file-gnu-find
                  nil t nil
                  "-L"
                  (expand-file-name dir)
                  "-type" "f"
                  "-iregex" (concat ".*\\(" regex "\\).*"))
    (delete ""
            (split-string (buffer-substring (point-min)
                                            (point-max))
                          "\n"))))


;; Track description

(defun db/emms-track-description (track)
  "Return custom description of TRACK.
This function can be used as a value for `emms-track-description-function’."
  (require 'seq)
  (let* ((artist    (propertize (emms-track-get track 'info-artist "")
                                'face 'emms-browser-artist-face))
         (composer  (propertize (emms-track-get track 'info-composer "")
                                'face 'emms-browser-composer-face))
         (performer (propertize (emms-track-get track 'info-performer "")
                                'face 'emms-browser-performer-face))
         (title     (propertize (emms-track-get track 'info-title "")
                                'face 'emms-browser-track-face))
         (album     (propertize (emms-track-get track 'info-album "")
                                'face 'emms-browser-album-face)))
    (if (not (seq-empty-p title))
        (concat (format "“%s”" title)
                (let* ((first-entry (cond ((not (seq-empty-p composer))
                                           composer)
                                          ((not (seq-empty-p artist))
                                           artist)))
                       (second-entry (when (and (not (seq-empty-p performer))
                                                (not (string= performer first-entry)))
                                       performer)))
                  (when first-entry
                    (if second-entry
                        (format " by %s, performed by %s" first-entry second-entry)
                      (format " by %s" first-entry))))
                (and (not (seq-empty-p album))
                     (format " (%s)" album)))
      (string-remove-prefix (expand-file-name emms-source-file-default-directory)
                            (emms-track-simple-description track)))))

;; don't set face in playlist to emms-playlist-track-face
(defun db/emms-playlist-mode-insert-track (track &optional no-newline)
  "Insert the description of TRACK at point.
When NO-NEWLINE is non-nil, do not insert a newline after the track."
  (emms-playlist-ensure-playlist-buffer)
  (emms-with-inhibit-read-only-t
   (insert (emms-propertize (emms-track-force-description track)
                            'emms-track track
                                        ;'face 'emms-playlist-track-face
                            ))
   (when (emms-playlist-selected-track-at-p)
     (emms-playlist-mode-overlay-selected))
   (unless no-newline
     (insert "\n"))))


;; Hydra

(defun db/emms-track-status ()
  "Return string displaying status of currently played track."
  (if emms-player-playing-p
      (format "%s" (emms-track-description
                    (emms-playlist-current-selected-track)))
    "«nothing»"))

(defhydra emms-control (:color red :hint none)
  "
Playing: %s(db/emms-track-status)

  _n_: ?n?          _p_: ?p?
_RET_: ?RET?    _M_: ?M?
  _-_: lower volume  _+_: ?+?
  _P_: ?P?

"
  ("n" emms-next         "next")
  ("p" emms-previous     "previous")
  ("RET" emms-pause      "play/pause")
  ("s" emms-show         "show title")
  ("-" emms-volume-lower "lower volume")
  ("+" emms-volume-raise "raise volume")
  ("M" emms              "show playlist")
  ("P" (lambda ()
         (interactive)
         (require 'db-music)
         (call-interactively db/playlist-play-function))
   "Play automatically generated playlist"))


;; End

(provide 'db-emms)

;;; db-emms ends here