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+;;; emacsconf-subed.el --- Utilities for working with subtitle files  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Sacha Chua
+
+;; Author: Sacha Chua <sacha@sachachua.com>
+;; Keywords: multimedia
+
+;; 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:
+
+;; You will need the subed package, which is available from NonGNU
+;; ELPA. For creating new caption files with
+;; emacsconf-subed-find-captions, you will also need compile-media.el
+;; from https://github.com/sachac/compile-media .
+
+;;; Code:
+
+(require 'subed)
+
+(defcustom emacsconf-subed-subtitle-max-length 50
+  "Target number of characters."
+  :group 'emacsconf
+  :type 'integer)
+
+(defcustom emacsconf-subed-subtitle-minimum-duration-ms 600
+  "Minimum length in milliseconds."
+  :group 'emacsconf
+  :type 'integer)
+
+
+(defun emacsconf-subed-fix-timestamps ()
+  "Change overlapping timestamps to the start of the next subtitle."
+  (interactive)
+  (goto-char (point-max))
+  (let ((timestamp (subed-subtitle-msecs-start)))
+    (while (subed-backward-subtitle-time-start)
+      (when (> (subed-subtitle-msecs-stop) timestamp)
+        (subed-set-subtitle-time-stop timestamp))
+      (setq timestamp (subed-subtitle-msecs-start)))))
+
+(defun emacsconf-subed-mark-chapter (chapter-name)
+  (interactive "MChapter: ")
+  (let ((start (subed-subtitle-msecs-start)))
+    (save-excursion
+      (when (and (subed-backward-subtitle-time-stop)
+                 (= (subed-subtitle-msecs-stop) start))
+        (subed-set-subtitle-time-stop (1- start))))
+    (with-current-buffer (find-file-noselect
+                          (if (string-match "--main" (buffer-file-name))
+                              (replace-match "--chapters" nil t (buffer-file-name))
+                            (concat (file-name-sans-extension (buffer-file-name)) "--chapters.vtt")))
+      (goto-char (point-max))
+      (if (bobp)
+          (insert "WEBVTT\n\n"
+                  (subed-make-subtitle nil start nil chapter-name))
+        (insert "\n" (subed-make-subtitle nil start nil chapter-name)))
+      (when (subed-backward-subtitle-time-stop)
+        (subed-set-subtitle-time-stop (1- start)))
+      (save-buffer))))
+
+(defun emacsconf-subed-convert-transcript-to-directives (id &optional chapters)
+  (interactive (read-string "ID: " "mainVideo"))
+  (goto-char (point-min))
+  (let* ((chapter-starts (mapcar 'car chapters))
+         (result (concat
+                  "<a name=\"transcript\"></a>\n# Transcript\n\n"
+                  (cl-loop while (subed-forward-subtitle-text)
+                           concat (format
+                                   "[[!template %stext=\"%s\" start=\"%s\" video=\"%s\" id=subtitle]]\n"
+                                   (if (member (subed-subtitle-msecs-start) chapter-starts)
+                                       "new=\"1\" "
+                                     "")
+                                   (replace-regexp-in-string
+                                    "\n" " " 
+                                    (replace-regexp-in-string
+                                     "\"" "&quot ;"
+     (replace-regexp-in-string "[][]" "" (subed-subtitle-text))))
+                                   (subed-vtt--msecs-to-timestamp (subed-subtitle-msecs-start))
+                                   id)))))
+    (when (called-interactively-p 'any)
+      (kill-new result))
+    result))
+
+(defun conf-prepare-transcript-directives ()
+  (interactive)
+  (let* ((info (emacsconf-get-talk-info-for-subtree))
+         (wiki-file (plist-get info :wiki-file-path))
+         (caption-file (expand-file-name (concat (plist-get info :video-slug) "--main.vtt")
+                                         conf-captions-directory))
+         (chapters (emacsconf-subed-chapters-as-list info)))
+    (with-temp-file wiki-file
+      (insert
+       (with-current-buffer (find-file-noselect caption-file)
+         (emacsconf-subed-convert-transcript-to-directives "mainVideo" chapters))))
+    (find-file wiki-file)))
+
+(defun emacsconf-subed-download-captions (&optional youtube-url video-slug)
+  (interactive (list (org-entry-get (point) "YOUTUBE_URL") (org-entry-get (point) "VIDEO_SLUG")))
+  (shell-command
+   (mapconcat
+    (lambda (f)
+      (format "youtube-dl --write-sub --write-auto-sub --no-warnings --sub-lang en --skip-download --sub-format %s %s -o %s"
+              f
+              youtube-url
+              (expand-file-name video-slug conf-captions-directory)))
+    '("vtt" "srv2")
+    ";")))
+
+(defun emacsconf-subed--copy-downloaded-captions-base (video-slug url type)
+  (let ((new-file (expand-file-name (concat video-slug "--" type ".ass") emacsconf-captions-directory)))
+    (call-process "ffmpeg" nil nil nil "-y" "-i" (emacsconf-latest-file emacsconf-download-directory "srt$")
+                  new-file)
+    (emacsconf-subed-download-captions url new-file)
+    (with-current-buffer (find-file new-file)
+      (goto-char (point-min))
+      (emacsconf-subed-fix-timestamps)
+      (save-buffer))))
+
+(defun emacsconf-subed-copy-downloaded-captions ()
+  "Copy the most recently downloaded captions for this entry's main talk."
+  (interactive)
+  (emacsconf-subed--copy-downloaded-captions-base
+   (org-entry-get (point) "VIDEO_SLUG")
+   (org-entry-get (point) "YOUTUBE_URL")
+   "main"))
+
+(defun emacsconf-subed-copy-downloaded-qa-captions ()
+  "Copy the most recently downloaded captions for this entry's Q&A"
+  (interactive)
+  (emacsconf-subed--copy-downloaded-captions-base
+   (org-entry-get (point) "VIDEO_SLUG")
+   (org-entry-get (point) "QA_YOUTUBE")
+   "answers"))
+
+(defun emacsconf-subed-find-captions ()
+  "Open the caption file for this talk.
+Create it if necessary."
+  (interactive)
+  (require 'compile-media)
+  (let ((video-slug (org-entry-get (point) "VIDEO_SLUG")))
+    (find-file
+     (or (car (directory-files conf-captions-directory
+                               t
+                               (concat (regexp-quote video-slug)
+                                       "--main\\.\\(srt\\|vtt\\)")))
+         (expand-file-name (concat video-slug "--main.vtt") "captions")))
+    (when (eobp)
+      (insert "WEBVTT\n\n0:00:00.000 --> "
+              (compile-media-msecs-to-timestamp
+               (compile-media-get-file-duration-ms (subed-guess-video-file)))
+              "\n"))))
+
+(defun emacsconf-subed-check-subtitles ()
+  "Do some simple validation of subtitles."
+  (interactive)
+  (while (not (eobp))
+    (if (> (length (subed-subtitle-text)) emacsconf-subed-subtitle-max-length)
+        (error "Length %d exceeds maximum length" (length (subed-subtitle-text))))
+    (if (< (- (subed-subtitle-msecs-stop) (subed-subtitle-msecs-start)) emacsconf-subed-subtitle-minimum-duration-ms)
+        (error "Duration %d is less than minimum" (- (subed-subtitle-msecs-stop) (subed-subtitle-msecs-start))))
+    (or (subed-forward-subtitle-text) (goto-char (point-max)))))
+
+(defun emacsconf-subed-chapters-as-list (info)
+  (when (file-exists-p (expand-file-name (concat (plist-get info :video-slug) "--main--chapters.vtt")
+                                         conf-captions-directory))
+    (with-current-buffer (find-file-noselect (expand-file-name (concat (plist-get info :video-slug) "--main--chapters.vtt")
+                                                               conf-captions-directory))
+      (let (result)
+        (subed-for-each-subtitle (point-min) (point-max) nil
+          (setq result
+                (cons
+                 (cons (subed-subtitle-msecs-start)
+                       (subed-subtitle-text)) 
+                 result)))
+        (nreverse result)))))
+
+(defun emacsconf-subed-chapters-buffer-as-list ()
+  (let (result)
+    (subed-for-each-subtitle (point-min) (point-max) nil
+      (setq result
+            (cons
+             (list
+              :text
+              (subed-subtitle-text)
+              :start-ms
+              (subed-subtitle-msecs-start)
+              :stop-ms
+              (subed-subtitle-msecs-stop)) 
+             result)))
+    (nreverse result)))
+
+(defun emacsconf-subed-chapters-as-description ()
+  (interactive)
+  (let ((result
+         (mapconcat
+          (lambda (o)
+            (concat (format-seconds "%.2m:%.2s" (/ (plist-get o :start-ms) 1000))
+                    " "
+                    (plist-get o :text)))
+          (emacsconf-subed-chapters-buffer-as-list)
+          "\n")))
+    (when (called-interactively-p 'any)
+      (kill-new result))
+    result))
+
+(provide 'emacsconf-subed)
+;;; emacsconf-subed.el ends here