<!--  -*- mode: web -*- -->
<style>
 .roofpig { max-width: 400px; margin-bottom: 80px; }
 </style>
 <script>

  function waitToAddSpeech() {
    if (window.cubesSpeakMoves || !window.speechSynthesis) return;
    if (window.CubeAnimation) {
      window.cubesSpeakMoves = true;
        addSpeechToCubeAnimations();
      } else {
        setTimeout(setUpCubes, 300);
      }
  }
  
  function setUpCubes() {
    if (!document.querySelector('script.roofpig')) {
      var script = document.createElement('script');
      script.setAttribute('src', '/blog/2023/02/using-org-babel-to-learn-rubik-s-cube-algorithms/roofpig_and_three.min.js');
      script.classList.add('roofpig');
      document.head.appendChild(script);
      waitToAddSpeech();
    }
  }
  
  function addSpeechToCubeAnimations() {
   if (!window.CubeAnimation || !window.CubeAnimation['by_id'] || !window.CubeAnimation['by_id'][1]) return;
   var cachedFunc = Object.getPrototypeOf(CubeAnimation['by_id'][1].dom).alg_changed;
   Object.getPrototypeOf(CubeAnimation['by_id'][1].dom).alg_changed = function() {
     if (arguments[4].past.length > lastNoted.length) {
       let moves = arguments[4].past.split(' ');
       let lastMove = moves[moves.length - 1];
       // is it lower-case? speak lowercase explicitly
       if (lastMove.match(/[rludbf]/)) {
         lastMove = 'lower ' + lastMove;
       } else { // avoid awkward-sounding moves like "capital R"
         lastMove = lastMove.toLowerCase();
       }
       lastMove = lastMove.replace(/'/, ' prime');
      window.speechSynthesis.speak(new SpeechSynthesisUtterance(lastMove));
     } else {
       console.log('going backwards');
     }
     lastNoted = arguments[4].past;
     return cachedFunc.apply(this, arguments);
   }
 }
 ROOFPIG_CONF_F2L = "solved=U*|hover=none|colored=U-|flags=canvas,showalg|speed=1000";
 ROOFPIG_CONF_PLL = "solved=U-|hover=near|colored=U*|flags=canvas,showalg|speed=1000";
 var lastNoted = '';
window.addEventListener('load', setUpCubes);
</script>

;; Start of cubing code
(defun my-cubing-pos (size n i)
  (list
   (* (/ size n) (% i n))
   (* (/ size n) (/ i n))))
  
(defun my-cubing-last-layer-arrows (arrows)
  "Draw ARROWS.
Arrows are defined as a list of lists of the form
((from to) (from to t) ...). Ex: '(my-cubing-last-layer-arrows '((3 1 t) (2 8 t)))
Cells are numbered from left to right, top to bottom, with the top left box being 0.
"
  (let* ((size 99)
         (n 3)
         (arrow-color "#000")
         (svg (svg-create size size)))
    (svg--append
     svg
     (dom-node
      'defs
      nil
      (dom-node
       'marker
       '((id . "arrowhead")
         (markerWidth . "10")
         (markerHeight . "7")
         (refX . "0")
         (refY . "3.5")
         (orient . "auto-start-reverse"))
       (dom-node
        'polygon
        `((fill . ,arrow-color)
          (points . "0 0, 4 3.5, 0 7")))
       )))
    (dotimes (i (* n n))
      (let ((pos (my-cubing-pos size n i)))
        (svg-rectangle
         svg
         (car pos)
         (cadr pos)
         (/ size n)
         (/ size n)
         :fill "#fff"
         :stroke-width 1
         :stroke "#666")))
    (dolist (arrow arrows)
      (let ((from (car arrow))
            (to (cadr arrow)))
        (apply 'svg-line
               (append
                (list svg)
                (mapcar (lambda (o) (+ o (/ size (* 2 n))))
                        (my-cubing-pos size n from))
                (mapcar (lambda (o) (+ o (/ size (* 2 n))))
                        (my-cubing-pos size n to))
                (list
                 :stroke-width 2
                 :stroke arrow-color
                 :marker-start (if (elt arrow 2) "url(#arrowhead)")
                 :marker-end "url(#arrowhead)")))))
    (with-temp-buffer
      (svg-print svg)
      (buffer-string))))

(defvar my-cubing-colors '((?R  . "#ff0000")
                           (?G  . "#00ff00")
                           (?B  . "#0000ff")
                           (?O  . "#ed7117")
                           (?Y  . "#ffff00")
                           (?W  . "#ffffff")
                           (?\? . "#666666")))

(defun my-cubing-last-layer-with-sides (sides top arrows)
  "Draw a diagram of the top of the cube.
The style is similar to https://www.cubeskills.com/uploads/pdf/tutorials/pll-algorithms.pdf .
SIDES is a string specifying colors going clockwise from the back-left side.
TOP is a string specifying colors going from left to right, top to bottom.
Arrows are defined as a list of lists of the form ((from to) (from to t) ...).
Cells are numbered from left to right, top to bottom, with the top left box being 0.
Ex: (my-cubing-last-layer-with-sides \"ORRBOOGGGRBB\" \"YYYYYYYYY\" '((3 1 t) (2 8 t)))
"
  (let* ((size 99)
         (n 3)
         (side-size 10)
         (cell-size (/ (- size (* 2 side-size)) n))
         (arrow-color "#000")
         (svg (svg-create size size)))
    (svg--append
     svg
     (dom-node
      'defs
      nil
      (dom-node
       'marker
       '((id . "arrowhead")
         (markerWidth . "10")
         (markerHeight . "7")
         (refX . "0")
         (refY . "3.5")
         (orient . "auto-start-reverse"))
       (dom-node
        'polygon
        `((fill . ,arrow-color)
          (points . "0 0, 4 3.5, 0 7"))))))
    ;; Draw the sides. It's a string of colors going clockwise from back left
    (when sides
      (dotimes (i (* n 4))
        (apply 'svg-rectangle
               (append
                (list svg)
                (pcase (/ i n)
                  (0 (list (+ (* (% i n) cell-size) side-size)
                           0
                           cell-size
                           side-size))
                  (1 (list (+ side-size (* n cell-size))
                           (+ (* (% i n) cell-size) side-size)
                           side-size
                           cell-size))
                  (2 (list (+ (* (- n (% i n) 1) cell-size) side-size)
                           (+ (* n cell-size) side-size)
                           cell-size
                           side-size))
                  (3 (list 0
                           (+ (* (- n (% i n) 1) cell-size) side-size)
                           side-size
                           cell-size)))
                (list
                 :stroke-width 1
                 :stroke "#666"
                 :fill (assoc-default (elt sides i)
                                      my-cubing-colors
                                      'eq
                                      (assoc-default ?\? my-cubing-colors)))))))
    ;; Draw the top face specified by a string of colors going from left to right, top to bottom
    (dotimes (i (* n n))
      (let ((pos (my-cubing-pos (* cell-size n) n i)))
        (svg-rectangle
         svg
         (+ side-size (car pos))
         (+ side-size (cadr pos))
         cell-size
         cell-size
         :fill (if top
                   (assoc-default (elt top i) my-cubing-colors
                                  'eq
                                  (assoc-default ?\? my-cubing-colors))
                 (assoc-default ?\? my-cubing-colors))
         :stroke-width 1
         :stroke "#666")))
    ;; Draw the arrows
    (dolist (arrow arrows)
      (let ((from (car arrow))
            (to (cadr arrow)))                  
        (apply 'svg-line
               (append
                (list svg)
                (mapcar (lambda (o) (+ side-size o (/ cell-size 2)))
                        (my-cubing-pos (* n cell-size) n from))
                (mapcar (lambda (o) (+ side-size o (/ cell-size 2)))
                        (my-cubing-pos (* n cell-size) n to))
                (list
                 :stroke-width 2
                 :stroke arrow-color
                 :opacity 0.5
                 :marker-start (if (elt arrow 2) "url(#arrowhead)")
                 :marker-end "url(#arrowhead)")))))
    (with-temp-buffer
      (svg-print svg)
      (buffer-string))))
;; end of cubing code

(defun my-aspect-ratio (normalize &rest args)
  "Return the aspect ratio of ARGS.
If NORMALIZE is non-nil, return an aspect ratio >= 1 (width is greater than height).
ARGS can be:
- width height
- a filename
- a list of (width height)"
  (let (size width height result)
    (cond
     ((stringp (car args))
      (setq size (my-identify-image-size (car args)))
      (setq width (car size) height (cadr size)))
     ((listp (car args))
      (setq width (car (car args)) height (cadr (car args))))
     (t
      (setq width (car args) height (cadr args))))
    (when (and width height)
      (setq result (/ (* 1.0 width) height))
      (if (and normalize (< result 1))
          (/ 1 result)
        result))))

(defun my-files-not-matching-aspect-ratio (print-width print-height file-list)
  (let ((target-aspect-ratio (my-aspect-ratio t print-width print-height)))
    (seq-filter
     (lambda (filename)
       (let ((image-ratio (my-aspect-ratio t filename)))
         (when image-ratio
           (> (abs (- image-ratio
                      target-aspect-ratio))
              0.001))))
     file-list)))

(defvar my-smartcrop-image-command '("smartcrop" "--faceDetection"))

(defun my-smartcrop-image (filename aspect-ratio output-file &optional do-copy)
  "Call smartcrop command to crop FILENAME to ASPECT-RATIO if needed.
Write the result to OUTPUT-FILE.
If DO-COPY is non-nil, copy files if they already have the correct aspect ratio."
  (when (file-directory-p output-file)
    (setq output-file (expand-file-name (file-name-nondirectory filename)
                                        output-file)))
  (let* ((size (my-identify-image-size filename))
         (image-ratio (my-aspect-ratio t size))
         new-height new-width
         buf)
    (when image-ratio
      (if (< (abs (- image-ratio aspect-ratio)) 0.01)
          (when do-copy (copy-file filename output-file t))
        (with-current-buffer (get-buffer-create "*smartcrop*")
          (erase-buffer)
          (setq new-width
                (number-to-string
                 (floor (min
                         (car size)
                         (*
                          (cadr size)
                          (if (> (car size) (cadr size))
                              aspect-ratio
                            (/ 1.0 aspect-ratio))))))
                new-height
                (number-to-string
                 (floor (min
                         (cadr size)
                         (/
                          (car size)
                          (if (> (car size) (cadr size))
                              aspect-ratio
                            (/ 1.0 aspect-ratio)))))))
          (message "%d %d -> %s %s: %s" (car size) (cadr size) new-width new-height filename)
          (apply 'call-process
           (car
            my-smartcrop-image-command)
           nil t t
           (append
            (cdr my-smartcrop-image-command)
            (list
             "--width"
             new-width
             "--height"
             new-height
             filename
             output-file))))))))

#!/usr/bin/python3
import sys
import PIL
import PIL.Image as Image
import PIL.ImageDraw as ImageDraw
import PIL.ImageFont as ImageFont
from PIL import Image, ExifTags
import re
import os

# use: add-labels.py output-dir photo1 photo2 photo3
PHOTO_DIR = "/home/sacha/photos/"
OUTPUT_DIR = sys.argv[1]
OUTPUT_WIDTH = 6
OUTPUT_HEIGHT = 4
OUTPUT_RATIO = OUTPUT_WIDTH * 1.0 / OUTPUT_HEIGHT
font_fname = "/usr/share/fonts/truetype/noto/NotoSans-Regular.ttf"
ALWAYS = True
DO_ROTATE = False

def label_image(filename):
    numbers = re.sub(r'[^0-9]', '', filename)
    img = Image.open(filename)
    exif = {
        PIL.ExifTags.TAGS[k]: v
        for k, v in img._getexif().items()        if k in PIL.ExifTags.TAGS
    }
    if DO_ROTATE:
        # Rotate image
        if exif['Orientation'] == 3:
            img = img.rotate(180, expand=True)
        elif exif['Orientation'] == 6:
            img = img.rotate(270, expand=True)
        elif exif['Orientation'] == 8:
            img = img.rotate(90, expand=True)    
    # Label
    time = exif['DateTimeOriginal'][0:10].replace(':', '-')
    if not time:
        if len(numbers) >= 10 and numbers[0:4] >= '2016' and numbers[0:4] < '2025':
            time = '%s-%s-%s' % (numbers[0:4], numbers[4:6], numbers[6:8])
    new_filename = os.path.join(OUTPUT_DIR, time + ' ' + os.path.basename(filename))
    if ALWAYS or not os.path.isfile(new_filename):
        out = add_label(img, time)
        print(filename, time)
        out.save(new_filename)
        return new_filename

def add_label(img, caption):
    draw = ImageDraw.Draw(img)
    w, h = img.size
    border = int(min(w, h) * 0.02)
    font_size = int(min(w, h) * 0.04)
    # print(w, h, font_size)
    font = ImageFont.truetype(font_fname, font_size)
    _, _, text_w, text_h = draw.textbbox((0, 0), caption, font)
    overlay = Image.new('RGBA', (w, h))
    draw = ImageDraw.Draw(overlay)
    draw.rectangle([(border, h - text_h - 2 * border),
                    (text_w + 3 * border, h - border)],
                   fill=(255, 255, 255, 128))
    draw.text((border * 2, h - text_h - 2 * border), caption, (0, 0, 0), font=font)
    out = Image.alpha_composite(img.convert('RGBA'), overlay).convert('RGB')
    return out

if len(sys.argv) >= 2:
    for a in sys.argv[2:]:
        if ALWAYS or not os.path.exists(a):
            print(a)
            try:
                label_image(a)
            except Exception as e:
                print("Error", a, e)

(setq org-babel-exp-code-template "#+begin_src %lang%switches%flags :summary %summary\n%body\n#+end_src")
(defun my-org-html-src-block (src-block _contents info)
  (let* ((result (org-html-src-block src-block _contents info))
         (block-info
          (org-with-point-at (org-element-property :begin src-block)
            (org-babel-get-src-block-info)))         
         (summary (assoc-default :summary (elt block-info 2))))
    (if (member summary '("%summary" ""))
        result
      (format "<details><summary>%s</summary>%s</details>"
              summary
              result))))
(with-eval-after-load 'ox-html
  (map-put! 
   (org-export-backend-transcoders (org-export-get-backend 'html))
   'src-block 'my-org-html-src-block))