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;;; emacsconf-mail.el --- Mail merge functions       -*- lexical-binding: t; -*-

;; Copyright (C) 2022  Sacha Chua

;; Author: Sacha Chua <sacha@sachachua.com>
;; Keywords: mail

;; 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:

;; 

;;; Code:

(defun emacsconf-mail-complete-email-group (&optional info)
  "Return (email . (talk talk))."
  (setq info (emacsconf-filter-talks (or info (emacsconf-get-talk-info))))
  (save-window-excursion
    (let* ((grouped (seq-group-by (lambda (o) (plist-get o :email)) info))
           (slug (emacsconf-get-slug-from-string (emacsconf-complete-talk)))
           (email (plist-get (seq-find (lambda (o) (string= (plist-get o :slug) slug)) info) :email)))
      (assoc email grouped))))

(defun emacsconf-mail-prepare (template email attrs)
  (compose-mail
   email
   (emacsconf-replace-plist-in-string attrs (or (plist-get template :subject) ""))
   (delq nil
         (list
          (if (plist-get template :reply-to) (cons "Reply-To" (emacsconf-replace-plist-in-string attrs (plist-get template :reply-to))))
          (if (plist-get template :mail-followup-to)
              (cons "Mail-Followup-To" (emacsconf-replace-plist-in-string attrs (plist-get template :mail-followup-to))))
          (if (plist-get template :cc)
              (cons "Cc" (emacsconf-replace-plist-in-string attrs (plist-get template :cc)))))))
  (message-sort-headers)
  (message-goto-body)
  (save-excursion (insert (emacsconf-replace-plist-in-string attrs (plist-get template :body)))
                  (goto-char (point-min))
                  (emacsconf-mail-merge-wrap)))

(defun emacsconf-mail-template-to-me ()
  "Might be useful for testing."
  (interactive)
  (let* ((template (if (org-entry-get (point) "EMAIL_ID")
                       (emacsconf-mail-merge-get-template-from-subtree)
                     (emacsconf-mail-merge-get-template
                      (completing-read "Template: " (org-property-values "EMAIL_ID")))))
         (mail-func (plist-get template :function)))
    (funcall mail-func user-mail-address template)))

(defun emacsconf-mail-template-to-volunteer (volunteer)
  "Prompt for a volunteer and e-mail current template to them."
  (interactive (list (with-current-buffer (find-file-noselect emacsconf-org-file))))
  (let ((template (if (org-entry-get (point) "EMAIL_ID")
                      (emacsconf-mail-merge-get-template-from-subtree)
                    (emacsconf-mail-merge-get-template
                     (completing-read "Template: " (org-property-values "EMAIL_ID")))))
        (volunteers (emacsconf-get-volunteer-info))
        (mail-func (plist-get template :function)))
    (funcall mail-func (emacsconf-complete-volunteer) template)))

(defun emacsconf-mail-template-to-group ()
  "Prompt for a speaker and e-mail current template to them."
  (interactive)
  (let* ((template (if (org-entry-get (point) "EMAIL_ID")
                       (emacsconf-mail-merge-get-template-from-subtree)
                     (emacsconf-mail-merge-get-template
                      (completing-read "Template: " (org-property-values "EMAIL_ID")))))
         (mail-func (plist-get template :function)))
    (funcall mail-func (emacsconf-mail-complete-email-group) template)))

(defun emacsconf-mail-template-to-all-groups ()
  "Uses the current template to draft messages to all the speakers.
Group by e-mail."
  (interactive)
  (let* ((template (if (org-entry-get (point) "EMAIL_ID")
                       (emacsconf-mail-merge-get-template-from-subtree)
                     (emacsconf-mail-merge-get-template
                      (completing-read "Template: " (org-property-values "EMAIL_ID")))))
         (info (seq-filter (lambda (o)
                             (if (plist-get template :slugs)
                                 (member (plist-get o :slug)
                                         (split-string (plist-get template :slugs) " "))
                               t))
                           (emacsconf-prepare-for-display (emacsconf-filter-talks (emacsconf-get-talk-info)))))
         (grouped (emacsconf-mail-group-by-email info))
         (mail-func (plist-get template :function)))
    (mapc (lambda (group)
            (funcall mail-func group template))
          grouped)))

(defun emacsconf-mail-log-message-when-sent (o message)
  (add-hook 'message-sent-hook
            `(lambda ()
               (save-window-excursion
                 (emacsconf-add-to-talk-logbook ,(plist-get o :slug) ,message)))
            nil t))

(defun emacsconf-mail-group-by-email (info)
  (seq-group-by (lambda (o) (plist-get o :email)) info))

(defun emacsconf-mail-speaker (&optional subject body talk)
  "Compose a message to the speaker of the current talk."
  (interactive (list nil nil (emacsconf-complete-talk-info)))
  (compose-mail (plist-get talk :email) subject)
  (when body (message-goto-body) (insert body)))

(defun emacsconf-mail-speaker-schedule (&optional subject body)
  (interactive (list (read-string "Subject: ") nil))
  (let ((info (emacsconf-get-talk-info-for-subtree)))
    (emacsconf-mail-speaker subject body)
    (when body (message-goto-body) (insert body))
    (goto-char (point-max))
    (insert (string-join (emacsconf-timezone-strings info) "\n"))))

(defvar emacsconf-submit-email "emacsconf-submit@gnu.org" "E-mail address for submissions.")

(defun emacsconf-mail-speaker-cc-submit (&optional subject body)
  "Compose a message to the speaker of the current talk."
  (interactive)
  (compose-mail (format "%s <%s>" (org-entry-get (point) "NAME") (org-entry-get (point) "EMAIL"))
                subject '(("Reply-To" . emacsconf-submit-email) ("Cc" . emacsconf-submit-email)))
  (message-goto-body)
  (when body (insert body))
  (save-excursion (insert "Please keep " emacsconf-submit-email " in the To: or Cc: when replying. Thank you!")))

(defun emacsconf-mail-show-talk-info ()
  (interactive)
  (let ((email (or (mail-fetch-field "reply-to") (mail-fetch-field "from"))))
    (when (string-match "<\\(\\(\\sw\\|\\s_\\|\\s.\\)+@\\(\\sw\\|\\s_\\|\\s.\\)+\\)>" email)
      (setq email (match-string 1 email)))
    (pop-to-buffer (find-file-noselect emacsconf-org-file))
    (goto-char (point-min))
    (goto-char
     (or (org-find-property "EMAIL" email)
         (org-find-property "NAME"
                            (completing-read "Name: " (delq nil (org-map-entries (lambda () (org-entry-get "NAME"))))))))))





(defun emacsconf-mail-merge-wrap ()
  (interactive)
  (with-undo-amalgamate 
    (save-excursion
      (while (re-search-forward " *${wrap}" nil t)
        (replace-match "")
        (fill-paragraph)))))

(defun emacsconf-mail-merge-get-template-from-subtree ()
  (list :subject (org-entry-get-with-inheritance "SUBJECT")
        :cc (org-entry-get-with-inheritance "CC")
        :slugs (org-entry-get-with-inheritance "SLUGS")
        :reply-to (or (org-entry-get-with-inheritance "REPLY_TO") (org-entry-get-with-inheritance "REPLY-TO"))
        :mail-followup-to (or (org-entry-get-with-inheritance "MAIL_FOLLOWUP_TO")
                              (org-entry-get-with-inheritance "MAIL-FOLLOWUP-TO"))
        :body (replace-regexp-in-string "\n *," "\n"
                                        (buffer-substring-no-properties
                                         (progn
                                           (org-back-to-heading)
                                           (org-end-of-meta-data) (point))
                                         (org-end-of-subtree)))
        :function (when (org-entry-get-with-inheritance "FUNCTION")
                    (intern (org-entry-get-with-inheritance "FUNCTION")))))

(defun emacsconf-mail-merge-get-template (id)
  "Return the information for the e-mail template with EMAIL_ID set to ID."
  (save-excursion
    (let ((char (org-find-property "EMAIL_ID" id)))
      (if char
          (progn (goto-char char) (emacsconf-mail-merge-get-template-from-subtree))
        (with-current-buffer
            (find-file-noselect (expand-file-name "organizers-notebook/index.org" (expand-file-name emacsconf-year emacsconf-directory)))
          (setq char (org-find-property "EMAIL_ID" id))
          (if char
              (progn
                (goto-char char)
                (emacsconf-mail-merge-get-template-from-subtree))
            ;; Try the conf.org file
            (with-current-buffer (find-file-noselect emacsconf-org-file)
              (setq char (org-find-property "EMAIL_ID" id))
              (if char
                  (progn
                    (goto-char char)
                    (emacsconf-mail-merge-get-template-from-subtree))
                (error "Could not find template %s" id)))))))))

(defun emacsconf-mail-merge-fill (string)
  "Fill in the values for STRING using the properties at point.
Include some other things, too, such as emacsconf-year, title, name, email, url, and duration."
  (let (start (values `(("year" . ,emacsconf-year)
                  ("title" . ,(org-entry-get (point) "ITEM"))
                  ("name" . ,(org-entry-get (point) "NAME"))
                  ("email" . ,(org-entry-get (point) "EMAIL"))
                  ("url" . ,(format "%s%s/talks/%s" emacsconf-base-url emacsconf-year (org-entry-get (point) "SLUG")))
                  ("duration" . ,(org-entry-get (point) "TIME")))))
    (while (string-match "\\${\\([-a-zA-Z_]+?\\)}" string start)
      (if (assoc-default (match-string 1 string) values)
          (setq string (replace-match (assoc-default (match-string 1 string) values) t t string))
        (setq string (replace-match (save-match-data (org-entry-get (point) (match-string 1 string))) t t string)))
      (setq start (1+ (match-beginning 0))))
    string))

(defun emacsconf-mail-merge-format-email-address-for-subtree ()
  (if (string-match  "," (org-entry-get (point) "EMAIL"))
      (org-entry-get (point) "EMAIL")
    (format "%s <%s>" (org-entry-get (point) "NAME") (org-entry-get (point) "EMAIL"))))

(defun emacsconf-mail-merge-for-subtree (id note-field)
  (let* ((template (emacsconf-mail-merge-get-template id))
         (body (emacsconf-mail-merge-fill (plist-get template :body)))
         (subject (emacsconf-mail-merge-fill (plist-get template :subject)))
         (note (org-entry-get (point) note-field)))
    (compose-mail (emacsconf-mail-merge-format-email-address-for-subtree)
                  subject
                  `(("Reply-To" . ,(plist-get template :reply-to))
                    ("Mail-Followup-To" . ,(plist-get template :mail-followup-to))
                    ("Cc" . ,(plist-get template :cc))))
    (message-goto-body)
    (save-excursion 
      (when note (insert "#+NOTE: " note "\n======== Delete above before sending =============\n\n"))
      (insert body))))

(defun emacsconf-mail-merge-cancel ()
  (interactive)
  (mapc (lambda (buffer)
          (when (string-match "unsent" (buffer-name buffer))
            (let ((kill-buffer-query-functions nil)
                  (buffer-modified-p nil))
              (set-buffer-modified-p nil)
              (kill-buffer buffer))))
        (buffer-list)))

(provide 'emacsconf-mail)
;;; emacsconf-mail.el ends here