(require 'cl-lib)
(require 'org)
(require 'ox-publish)
(add-to-list 'load-path "~/.emacs.d/elpa/ox-rss-20230408.231")
(add-to-list 'load-path "~/.emacs.d/elpa/mustache-20230713.514")
(add-to-list 'load-path "~/.emacs.d/elpa/s-20220902.1511")
(add-to-list 'load-path "~/.emacs.d/elpa/dash-20240103.1301")
(add-to-list 'load-path "~/.emacs.d/elpa/f-20231219.750")
(add-to-list 'load-path "~/.emacs.d/elpa/htmlize-20240212.1001")
(require 'ox-rss)
(load "~/.emacs.d/lisp/mustache-html.el")

(setq org-html-doctype "html5")
(setq org-html-head-include-default-style nil)
(setq org-html-htmlize-output-type 'css) ; default: 'inline-css
(setq org-time-stamp-custom-formats '("%A %e %B %Y" . "%A %e %B %Y at %H:%M"))
(setq org-display-custom-times t)
(setq org-html-container-element "div") ;; TODO - check
(setq my-blog-base-folder "~/websites/stage.vanrenterghem.biz")
(setq my-blog-source-folder "~/websites/stage.vanrenterghem.biz/source")
(setq my-blog-target-folder "~/websites/stage.vanrenterghem.biz/target")
(setq my-blog-target-url "https://www.vanrenterghem.biz/posts/")
(setq my-blog-mustache-folder (file-name-concat my-blog-base-folder "html"))
(setq my-blog-tags-folder (file-name-concat my-blog-source-folder "tags"))
(setq my-blog-posts-folder (file-name-concat my-blog-source-folder "posts"))

(setq org-export-time-stamp-file nil)
(setq org-rss-use-entry-url-as-guid nil)

(defun my-org-get-all-filetags ()
  "Get list of filetags from all org-files in my-blog-posts-folder."
  (let ((files (directory-files my-blog-posts-folder t nil nil nil))
        tagslist x)
    (save-window-excursion
      (while (setq x (pop files))
        (set-buffer (find-file-noselect x))
        (mapc
         (lambda (y)
           (let ((tagfiles (assoc y tagslist)))
             (if tagfiles
                 (setcdr tagfiles (cons x (cdr tagfiles)))
               (add-to-list 'tagslist (list y x)))))
         (my-org-get-filetags)))
      tagslist)))

(defun my-org-get-filetags ()
  "Get list of filetags for current buffer"
  (let ((ftags org-file-tags)
        x)
    (mapcar
     (lambda (x)
       (org-no-properties x))
     ftags)))

(defun my-blog-create-tags-files (plist)
  "Create org files for each tag defined in FILETAGS in posts, storing them in my-blog-tags-folder."
  (let* ((tagfolder (file-name-concat
		    (plist-get (cdr (assoc "landing" org-publish-project-alist)) :base-directory)))
	 (postfolder (file-name-concat
		    (plist-get (cdr (assoc "posts" org-publish-project-alist)) :base-directory)))
	 (relpostfolder (file-relative-name  postfolder tagfolder)))
    (unless (file-directory-p my-blog-tags-folder) (make-directory my-blog-tags-folder))
    (with-temp-file (file-name-concat tagfolder "tag-index.org")
      (insert (concat "#+mustache-template: " (file-name-concat my-blog-mustache-folder "tags-index.mustache") "\n"))
      (insert (concat "#+TITLE: Blog - All tags\n"))
      (insert "#+OPTIONS: ^:nil\n") ; do not use underscores as subscript
      (insert "\n")
      (dolist (tag (sort (my-org-get-all-filetags) (lambda (x y) (string-lessp (car x) (car y))) ))
	(insert (concat "- [[file:" (file-name-concat relpostfolder (concat "tag-" (car tag) ".org")) "][" (car tag) "]]\n"))))) 
  (dolist (tag (my-org-get-all-filetags))
    (with-temp-file (file-name-concat my-blog-tags-folder (concat "tag-" (car tag) ".org"))
      (insert (concat "#+mustache-template: " (file-name-concat my-blog-mustache-folder "tags.mustache") "\n"))
      (insert (concat "#+TITLE: " (car tag) "\n"))
      (insert "#+OPTIONS: ^:nil\n") ; do not use underscores as subscript
      (insert "\n")
      (insert (concat "# " (car tag) "\n\n"))
      (dolist (tagfile (my-blog-sort-article-list (cdr tag) plist))
	(let ((relpath (file-relative-name tagfile my-blog-posts-folder)));;not used
	  (message (concat "Processing " tagfile))
	  (insert (concat "- " (format "%s - [[file:%s][%s]]" ;;the date and filename are added after the entry
		 (format-time-string (car org-time-stamp-custom-formats) (org-publish-find-date tagfile plist))
		 relpath
		 (org-publish-find-title tagfile plist))
			  "\n")))))))
					;(my-org-publish-sitemap-default-entry tagfile nil plist) "\n")))))))

(defun my-org-publish-sitemap-default-entry (entry style project)
  "My format for site map ENTRY, as a string.
ENTRY is a file name.  STYLE is the style of the sitemap.
PROJECT is the current project."
  (cond ((not (directory-name-p entry))
	 (format "%s - [[file:%s][%s]]" ;;the date and filename are added after the entry
		 (format-time-string (car org-time-stamp-custom-formats) (org-publish-find-date entry project))
		 entry
		 (org-publish-find-title entry project)))
	((eq style 'tree)
	 ;; Return only last subdir.
	 (file-name-nondirectory (directory-file-name entry)))
	(t entry)))

(defun my-blog-parse-sitemap-list (l)
  "Convert the sitemap list in to a list of filenames."
  (mapcar #'(lambda (i)
              (let ((link (with-temp-buffer
                            (let ((org-inhibit-startup nil))
                              (insert (car i))
                              (org-mode)
                              (goto-char (point-min))
                              (org-element-link-parser)))))
                (when link
                  (plist-get (cadr link) :path))))
          (cdr l)))

(defun my-blog-sort-article-list (l p)
  "sort the article list anti-chronologically."
  (sort l #'(lambda (a b)
              (let ((d-a (org-publish-find-date a p))
                    (d-b (org-publish-find-date b p)))
                (not (time-less-p d-a d-b))))))

(defun my-blog-get-preview (file)
  "Clips a section of a post in FILE to be used as preview in the sitemap.
Either the section between #+BEGIN_PREVIEW and +#END_PREVIEW is used, or the first section between 2 blank lines."
  (with-temp-buffer
    (insert-file-contents file)
    (goto-char (point-min))
    (let* ((beg (or (re-search-forward "^#\\+BEGIN_PREVIEW$" nil t 1)
		    (re-search-forward "^$")))
           (end (or (if (re-search-forward "^#\\+END_PREVIEW$" nil t 1)
			(match-beginning 0))
		    (progn (goto-char (+ 1 beg))
			   (re-search-forward "^$" nil t 2)))))
      (buffer-substring beg end))))

(defun my-blog-sitemap (title list)
  "Generate the sitemap landing page for my blog."
  (my-plain-publish-sitemap-default title list) ; Create additional sitemap
  (with-temp-buffer
    ;; mangle the parsed list given to us into a plain lisp list of files
    (let* ((filenames (my-blog-parse-sitemap-list list))
           (project-plist (assoc "posts" org-publish-project-alist))
           (articles (my-blog-sort-article-list filenames project-plist)))
      (dolist (file filenames)
	(let* ((abspath (file-name-concat "/home/frederik/websites/stage.vanrenterghem.biz/source/posts" file))
               (relpath (file-relative-name abspath "/home/frederik/websites/stage.vanrenterghem.biz/source/posts/"))
               (title (org-publish-find-title file project-plist))
               (date (format-time-string (cdr org-time-stamp-custom-formats) (org-publish-find-date file project-plist)))
               (preview (my-blog-get-preview abspath))
	       )
          ;; insert a horizontal line before every post, kill the first one
          ;; before saving
          (insert (concat "* [[file:" relpath "][" title "]]\n"))
          ;; add properties for `ox-rss.el' here
	  (let ((rss-permalink (concat (file-name-sans-extension relpath) ".html"))
		(rss-pubdate (format-time-string (cdr org-time-stamp-formats) (org-publish-find-date file project-plist))))
	    (org-mode)
	    (org-set-property "HTML_CONTAINER_CLASS" "card mb-2") ;Bootstrap margin border 2
	    (org-set-property "HTML_HEADLINE_CLASS" "card-header card-title border-bottom-0 fs-5 fw-bold text-decoration-none")
	    (org-set-property "RSS_PERMALINK" rss-permalink)
	    (org-set-property "PUBDATE" rss-pubdate)
	    (org-set-property "RSS_TITLE" title))
          ;; insert the date, preview, & read more link
	  (insert "#+ATTR_HTML: :class card-header\n")
          (insert (concat "Published: " date "\n\n"))
	  (insert "#+BEGIN_export html\n")
	  (insert "<section class=\"card-body\">\n")
	  (insert "#+END_export\n")
	  (insert preview)
					;(insert (concat "#+INCLUDE: \"" relpath "\" :only-contents t :lines \"1-10\"\n"))
	  (insert "\n")
          (insert (concat "[[file:" relpath "][Read More...]]\n"))
	  (insert "#+BEGIN_export html\n")
	  (insert "</section> <!-- END CARD-BODY-->\n")
	  (insert "#+END_export\n")
	  ))
      ;; kill the first hrule to make this look OK
      ;(goto-char (point-min))
      ;(let ((kill-whole-line t)) (kill-line))
      ;; insert a title and save
      (insert "#+OPTIONS: title:nil\n")
      (insert "#+TITLE: Frederik Vanrenterghem's blog\n")
      (insert "#+AUTHOR: Frederik Vanrenterghem\n")
      (insert "#+EMAIL: frederik@vanrenterghem.biz\n")
      (insert "#+OPTIONS: ^:nil\n") ; do not use underscores as subscript
      (insert (concat "#+mustache-template: " (file-name-concat my-blog-mustache-folder "post-index.mustache") "\n"))
      (insert "\n")
      (buffer-string))))

(defun my-plain-publish-sitemap-default (title list)
  "Create a simple site map, as a string.
TITLE is the title of the site map.  LIST is an internal
representation for the files to include, as returned by
`org-list-to-lisp'."
  (with-temp-file "~/websites/stage.vanrenterghem.biz/source/sitemap.org"
    (let* ((filenames (my-blog-parse-sitemap-list list))
           (project-plist (assoc "posts" org-publish-project-alist))
           (articles (my-blog-sort-article-list filenames project-plist)))
      (dolist (file filenames)
	(let* ((abspath (file-name-concat "/home/frederik/websites/stage.vanrenterghem.biz/source/posts" file))
               (relpath (file-relative-name abspath "/home/frederik/websites/stage.vanrenterghem.biz/source/"))
               (title (org-publish-find-title file project-plist))
               (date (format-time-string (car org-time-stamp-custom-formats) (org-publish-find-date file project-plist))))
    	  (insert (concat "* " date " - [[file:" relpath "][" title "]]\n"))))
      (goto-char (point-min))
      (insert "#+OPTIONS: ^:nil\n")))) ; do not use underscores as subscript

(defun my-blog-cleanup-sitemaps (plist)
  "Clean up temporary files created in the process of publishing"
  ;; Create a body-only version of the tags index. Needs absolute path to posts folder.
  (with-temp-file (file-name-concat
		   (plist-get (cdr (assoc "landing" org-publish-project-alist)) :publishing-directory)
		   "tag-index-body.html")
    (insert-file-contents (file-name-concat
			   (plist-get (cdr (assoc "landing" org-publish-project-alist)) :base-directory)
			   "tag-index.org"))
    (org-export-to-buffer 'mustache-html (current-buffer) nil nil nil t nil)
    (replace-string "href=\"posts" "href=\"/posts"))
  (delete-file (file-name-concat my-blog-source-folder "sitemap.org"))
  (delete-file (file-name-concat my-blog-posts-folder "sitemap.org"))
  (delete-file (file-name-concat my-blog-posts-folder "sitemap.org~")))
  
(setq org-publish-project-alist
      `(("landing"
         :base-directory ,my-blog-source-folder
         :base-extension "org"
         :publishing-directory ,my-blog-target-folder
	 :publishing-function org-mustache-html-publish-to-html
	 :mustache-template ,(file-name-concat my-blog-mustache-folder "landing.mustache")
         :headline-levels 2
         :section-numbers nil
         :with-toc nil
	 :with-title nil
	 :html-content-class nil
	 :html-head-include-default-style nil
         :html-head nil
	 :html-divs nil
         :html-preamble nil
	 :html-postamble nil
	 )

	("posts"
         :base-directory ,my-blog-posts-folder
         :base-extension "org"
         :publishing-directory ,(file-name-concat my-blog-target-folder "posts")
         :publishing-function org-mustache-html-publish-to-html
	 :mustache-template ,(file-name-concat my-blog-mustache-folder "post.mustache")
	 :preparation-function my-blog-create-tags-files
         :exclude "html*\\|assets*\\|index.org\\|sitemap.org" ;"assets*\\|sitemap.org\\|index.org" ;; regexp
	 :html-content-class nil
         :section-numbers nil
         :with-toc nil
	 :with-title nil
	 :sitemap-title "All posts"
	 :html-head-include-default-style nil
         :html-head nil
	 :html-divs nil
	 :recursive t
	 :auto-sitemap t
	 :html-preamble nil
	 :html-postamble nil
	 :sitemap-sort-folders ignore-errors
	 :sitemap-function my-blog-sitemap
	 :sitemap-sort-files anti-chronologically
	 :sitemap-filename "sitemap.org"
	 )

	("tags"
         :base-directory ,(file-name-concat my-blog-source-folder "tags")
         :base-extension "org"
         :publishing-directory ,(file-name-concat my-blog-target-folder "posts")
         :publishing-function org-mustache-html-publish-to-html
	 :mustache-template ,(file-name-concat my-blog-mustache-folder "tags.mustache")
	 :html-content-class nil
         :section-numbers nil
         :with-toc nil
	 :with-title nil
	 :html-head-include-default-style nil
         :html-head nil
	 :html-divs nil
	 :recursive nil
	 :auto-sitemap nil
	 :html-preamble nil
	 :html-postamble nil
	 )

        ("assets"
         :base-directory ,(file-name-concat my-blog-source-folder "assets")
         :base-extension any
	 :recursive t
         :publishing-directory ,(file-name-concat my-blog-target-folder "assets")
         :publishing-function org-publish-attachment
	 :completion-function my-blog-cleanup-sitemaps
	 )
	
	("rss"
         :base-directory ,my-blog-posts-folder
         :base-extension "org"
         :publishing-directory ,(file-name-concat my-blog-target-folder "posts")
         :publishing-function org-rss-publish-to-rss
         :with-author t
	 :title "Frederik Vanrenterghem's blog"
         :html-link-home ,my-blog-target-url
         :html-link-use-abs-url t
	 :section-numbers nil
         :exclude ".*"
         :include ("sitemap.org")
         :table-of-contents nil
         )
	
        ("website" :components ("posts" "rss" "tags" "landing" "assets"))))

(org-publish-initialize-cache "website")