{ config, lib, pkgs, ... }:

with lib;

mkIf (elem "emacs::org" config.machine.pkgs) {
  programs.emacs.init.usePackage.org = {
    enable = true;
    package = epkgs: [ epkgs.org epkgs.org-plus-contrib ];
    mode = [ ''("\\.org\\'" . org-mode)'' ];
    command = [ "org-mode" ];
    hook = [ "(org-mode . (lambda () (org-indent-mode)))" ''
       (org-mode
         . (lambda ()
           ;; Automatic line-wrapping in org-mode
           ;;(auto-fill-mode 1)

           (setq completion-at-point-functions
                 '(org-completion-symbols
                   ora-cap-filesystem))))
      '' ''
       (org-mode
         . (lambda ()
          		   "Beautify Org Checkbox Symbol"
          		   (push '("[ ]" . "☐" ) prettify-symbols-alist)
          		   (push '("[X]" . "☑" ) prettify-symbols-alist)
          		   (push '("[-]" . "❍" ) prettify-symbols-alist)
          		   (prettify-symbols-mode)))
      ''
    ] ++ optional (elem "emacs::flyspell" config.machine.pkgs) "(org-mode . (lambda () (flyspell-mode)))";
    bind = {
      "C-c a" = "org-agenda";
    };
    bindLocal = { org-mode-map = {
      "M-<up>" = "org-metaup";
      "M-<down>" = "org-metadown";
      "M-." = "org-open-at-point";
      "M-," = "org-mark-ring-goto";
      "M-S-<return>" = "org-insert-todo-heading-respect-content";
      "M-<return>" = "org-meta-return";
      "M-p" = "org-previous-visible-heading";
      "M-n" = "org-next-visible-heading";
    } // (optionalAttrs (elem "emacs::company" config.machine.pkgs) {
      "<M-tab>" = "company-pcomplete";
    }); };
    config = ''
    ;; Insead of "..." show "…" when there's hidden folded content

    ;; org-prettify
    (defface org-checkbox-done-text
      '((t (:foreground "#71696A" :strike-through t)))
      "Face for the text part of a checked org-mode checkbox.")

    (font-lock-add-keywords
     'org-mode
     `(("^[ \t]*\\(?:[-+*]\\|[0-9]+[).]\\)[ \t]+\\(\\(?:\\[@\\(?:start:\\)?[0-9]+\\][ \t]*\\)?\\[\\(?:X\\|\\([0-9]+\\)/\\2\\)\\][^\n]*\n\\)"
        1 'org-checkbox-done-text prepend))
     'append)

    ;; Some characters to choose from: …, ⤵, ▼, ↴, ⬎, ⤷, and ⋱
    (setq org-ellipsis " ▼")
    ;; get nice looking tables (only for non org-tables; rarely used)
    (setq table-cell-horizontal-chars "\u2501")
    (setq table-cell-vertical-char ?\u2503)
    (setq table-cell-intersection-char ?\u254B)

    (setq org-directory "~/Documents/org/")

    ;; Show headings up to level 2 by default when opening an org files
    (setq org-startup-folded 'content)

    ;; Show inline images by default
    (setq org-startup-with-inline-images t)

    ;; Add more levels to headlines that get displayed with imenu
    (setq org-imenu-depth 5)

    ;; Enter key follows links (= C-c C-o)
    (setq org-return-follows-link t)

    ;; Don't remove links after inserting
    (setq org-keep-stored-link-after-insertion t)

    (setq org-tag-alist (quote ((:startgroup)
                                ("WAITING" . ?w)
                                ("HOLD" . ?h)
                                ("CANCELLED" . ?c)
                                ("NOTE" . ?n)
                                (:endgroup)
                                ("PERSONAL" . ?P)
                                ("WORK" . ?W)
                                ("ATOMX" . ?A)
                                ("E5" . ?E)
                                ("HOGASO" . ?H)
                                ("ORG" . ?o)
                                ("crypt" . ?C)
                                ("FLAGGED" . ??))))

    ;; Allow setting single tags without the menu
    (setq org-fast-tag-selection-single-key (quote expert))

    (setq org-archive-mark-done nil)
    (setq org-archive-location "%s_archive::* Archived Tasks")

    ;; C-RET, C-S-RET insert new heading after current task content
    (setq org-insert-heading-respect-content nil)

    ;; Show a little bit more when using sparse-trees
    (setq org-show-following-heading t)
    (setq org-show-hierarchy-above t)
    (setq org-show-siblings (quote ((default))))

    ;; don't show * / = etc
    (setq org-hide-emphasis-markers t)

    ;; leave highlights in sparse tree after edit. C-c C-c removes highlights
    (setq org-remove-highlights-with-change nil)

    ;; M-RET should not split the lines
    (setq org-M-RET-may-split-line '((default . nil)))

    (setq org-special-ctrl-a/e t)
    (setq org-special-ctrl-k t)
    (setq org-yank-adjusted-subtrees t)

    ;; Show org entities as UTF-8 characters (e.g. \sum as ∑)
    (setq org-pretty-entities t)
    ;; But Don't print "bar" as subscript in "foo_bar"
    (setq org-pretty-entities-include-sub-superscripts nil)
    ;; And also don't display ^ or _ as super/subscripts
    (setq org-use-sub-superscripts nil)
    ;; undone TODO entries will block switching the parent to DONE
    (setq org-enforce-todo-dependencies t)

    (setq org-use-fast-todo-selection t)

    (setq org-todo-keywords
          (quote ((sequence "TODO(t)" "NEXT(n)" "|" "DONE(d)")
                  (sequence "WAITING(w@/!)" "HOLD(h@/!)" "|" "CANCELLED(c@/!)" "PHONE" "MEETING"))))

    (setq org-todo-keyword-faces
          (quote (("TODO" :foreground "red" :weight bold)
                  ("NEXT" :foreground "blue" :weight bold)
                  ("DONE" :foreground "forest green" :weight bold)
                  ("WAITING" :foreground "orange" :weight bold)
                  ("HOLD" :foreground "magenta" :weight bold)
                  ("CANCELLED" :foreground "forest green" :weight bold)
                  ("MEETING" :foreground "forest green" :weight bold)
                  ("PHONE" :foreground "forest green" :weight bold))))

    ;; Auto completion for symbols in org-mode
    ;; https://oremacs.com/2017/10/04/completion-at-point/
    (defun org-completion-symbols ()
      (when (looking-back "[`~=][a-zA-Z]+" nil)
        (let (cands)
          (save-match-data
            (save-excursion
              (goto-char (point-min))
              (while (re-search-forward "[`~=]\\([a-zA-Z.\\-_]+\\)[`~=]" nil t)
                (cl-pushnew
                 (match-string-no-properties 0) cands :test 'equal))
              cands))
          (when cands
            (list (match-beginning 0) (match-end 0) cands)))))

(defun ora-cap-filesystem ()
  (let (path)
    (when (setq path (ffap-string-at-point))
      (when (string-match "\\`file:\\(.*\\)\\'" path)
        (setq path (match-string 1 path)))
      (let ((compl (all-completions path #'read-file-name-internal)))
        (when compl
          (let* ((str (car compl))
                 (offset
                  (let ((i 0)
                        (len (length str)))
                    (while (and (< i len)
                                (equal (get-text-property i 'face str)
                                       'completions-common-part))
                      (cl-incf i))
                    i)))
            (list (- (point) offset) (point) compl)))))))

    '';
  };

  programs.emacs.init.usePackage.ob = {
    enable = true;
    defer = true;
    init = ''
      (add-hook 'org-babel-after-execute-hook 'org-display-inline-images 'append)
    '';
    config = ''
    (setq org-confirm-babel-evaluate nil)  ; don't prompt me to confirm everytime I want to evaluate a block

    (defun org-babel-restart-session-to-point (&optional arg)
      "Restart session up to the src-block in the current point.
      Goes to beginning of buffer and executes each code block with
  `org-babel-execute-src-block' that has the same language and
  session as the current block. ARG has same meaning as in
  `org-babel-execute-src-block'."
      (interactive "P")
      (unless (org-in-src-block-p)
        (error "You must be in a src-block to run this command"))
      (let* ((current-point (point-marker))
             (info (org-babel-get-src-block-info))
             (lang (nth 0 info))
             (params (nth 2 info))
             (session (cdr (assoc :session params))))
        (save-excursion
          (goto-char (point-min))
          (while (re-search-forward org-babel-src-block-regexp nil t)
            ;; goto start of block
            (goto-char (match-beginning 0))
            (let* ((this-info (org-babel-get-src-block-info))
                   (this-lang (nth 0 this-info))
                   (this-params (nth 2 this-info))
                   (this-session (cdr (assoc :session this-params))))
              (when
                  (and
                   (< (point) (marker-position current-point))
                   (string= lang this-lang)
                   (src-block-in-session-p session))
                (org-babel-execute-src-block arg)))
            ;; move forward so we can find the next block
            (forward-line)))))

    (defun org-babel-kill-session ()
      "Kill session for current code block."
      (interactive)
      (unless (org-in-src-block-p)
        (error "You must be in a src-block to run this command"))
      (save-window-excursion
        (org-babel-switch-to-session)
        (kill-buffer)))

    (defun org-babel-remove-result-buffer ()
      "Remove results from every code block in buffer."
      (interactive)
      (save-excursion
        (goto-char (point-min))
        (while (re-search-forward org-babel-src-block-regexp nil t)
          (org-babel-remove-result))))


    ;; this adds a "new language" in babel that gets exported as js in html
    ;; https://www.reddit.com/r/orgmode/comments/5bi6ku/tip_for_exporting_javascript_source_block_to/
    (add-to-list 'org-src-lang-modes '("inline-js" . javascript))
    (defvar org-babel-default-header-args:inline-js
      '((:results . "html")
        (:exports . "results")))
    (defun org-babel-execute:inline-js (body _params)
      (format "<script type=\"text/javascript\">\n%s\n</script>" body))

    ;; Path when plantuml is installed from AUR (package `plantuml')
    (setq org-plantuml-jar-path "/opt/plantuml/plantuml.jar")

    ;; add all languages to org mode
    (org-babel-do-load-languages
     'org-babel-load-languages
     '((C . t)
       ;;(R . t)
       (asymptote)
       (awk)
       (calc . t)
       (clojure . t)
       (comint)
       (css)
       (ditaa . t)
       (dot . t)
       (emacs-lisp . t)
       (fortran)
       (gnuplot . t)
       (haskell)
       (io)
       (java)
       (js . t)
       (latex)
       (ledger . t)
       (lilypond)
       (lisp)
       (lua . t)
       (matlab)
       (maxima)
       (mscgen)
       (ocaml)
       (octave . t)
       (org . t)
       (perl)
       (picolisp)
       (plantuml . t)
       (python . t)
       ;; (ipython . t)
       ;; (restclient . t)
       (ref)
       (ruby)
       (sass)
       (scala)
       (scheme)
       (screen)
       (shell . t)
       (shen)
       (snippet)
       (sql . t)
       (sqlite . t)))
    '';
  };

  programs.emacs.init.usePackage.org-src = {
    enable = true;
    defer = true;
    init = ''(put 'org-src-preserve-indentation 'safe-local-variable 'booleanp)'';
    config = ''
      (setq org-src-window-setup 'current-window)

      (setq org-src-fontify-natively t)  ; syntax highlighting for source code blocks

      ;; Tab should do indent in code blocks
      ;; I think I hate this function (causes scroll on TAB
      (setq org-src-tab-acts-natively t)
      ;; ?Fix weird scrolling

      ;; Don't remove (or add) any extra whitespace
      (setq org-src-preserve-indentation nil)
      (setq org-edit-src-content-indentation 0)

      ;;; Some helper function to manage org-babel sessions

      (defun src-block-in-session-p (&optional name)
        "Return if src-block is in a session of NAME.
         NAME may be nil for unnamed sessions."
        (let* ((info (org-babel-get-src-block-info))
               ;;(lang (nth 0 info))
               ;;(body (nth 1 info))
               (params (nth 2 info))
               (session (cdr (assoc :session params))))

          (cond
           ;; unnamed session, both name and session are nil
           ((and (null session)
                 (null name))
            t)
           ;; Matching name and session
           ((and
             (stringp name)
             (stringp session)
             (string= name session))
            t)
           ;; no match
           (t nil))))

      ;; dot == graphviz-dot
      (add-to-list 'org-src-lang-modes '("dot" . graphviz-dot))

      ;; Add 'conf-mode' to org-babel
      (add-to-list 'org-src-lang-modes '("ini" . conf))
      (add-to-list 'org-src-lang-modes '("conf" . conf))
    '';
  };

  programs.emacs.init.usePackage.org-tempo = {
    enable = true;
  };

  programs.emacs.init.usePackage.ox = {
    enable = true;
    defer = true;
    command = [];
    config = ''
      ;; Use html5 as org export and use new tags
      (setq org-html-doctype "html5")
      (setq org-html-html5-fancy t)
      ;; Don't add html footer to export
      (setq org-html-postamble nil)
      ;; Don't export ^ or _ as super/subscripts
      (setq org-export-with-sub-superscripts nil)
    '';
  };

  programs.emacs.init.usePackage.ox-gfm = {
    enable = true;
    after = [ "ox" ];
  };

  programs.emacs.init.usePackage.ox-rst = {
    enable = true;
    after = [ "ox" ];
  };

  programs.emacs.init.usePackage.ox-md = {
    enable = true;
    after = [ "ox" ];
  };

  programs.emacs.init.usePackage.org-bullets = {
    enable = true;
    hook = [ "(org-mode . org-bullets-mode)" ];
  };

  programs.emacs.init.usePackage.org-crypt = {
    enable = true;
    after = [ "org" ];
    bindLocal = { org-mode-map = {
      "C-c d" = "org-decrypt-entry";
      "C-c e" = "org-encrypt-entry";
    };};
    config = ''
      (org-crypt-use-before-save-magic)
      (setq org-tags-exclude-from-inheritance (quote ("crypt")))
      ;; GPG key to use for encryption
      (setq org-crypt-key "BD9667B90757EAE9CDFE510A59A28744FE81FFEB")
      ;; don't ask to disable auto-save
      (setq org-crypt-disable-auto-save nil)
    '';
  };

  programs.emacs.init.usePackage.org-drill = {
    enable = true;
  };
}