;;; mail-config --- Settings for Mu4e Email -*- lexical-binding: t; coding: utf-8; -*-
;; author Craig Jennings <c@cjennings.net>
;;
;;; Commentary:
;;
;; Layer: 3 (Domain Workflow).
;; Category: D/P.
;; Load shape: eager.
;; Eager reason: daily mail; registers cj/email-map. mu4e/org-msg are heavy, so a
;;   command-loaded deferral candidate for Phase 5.
;; Top-level side effects: registers cj/email-map under cj/custom-keymap, one
;;   add-hook, two advice-add, one global key, package config.
;; Runtime requires: user-constants, system-lib, mu4e-attachments, keybindings.
;; Direct test load: yes (requires keybindings; mu4e package must be present).
;;
;; I found Aime Bertrand's blog post to be an excellent walkthrough of how to
;; setup a Mu4e config.
;;
;; https://macowners.club/posts/email-emacs-mu4e-macos/
;;
;; Attachment saving lives in the `mu4e-attachments' module; its C-; e
;; bindings are wired into `cj/email-map' below.
;;
;; Crash Fix:
;; auto-composition-mode is disabled in mu4e-headers-mode to prevent a
;; HarfBuzz SIGSEGV crash. Email subjects containing emoji trigger glyph
;; shaping via arabic-shape-gstring → hb_shape_full, which segfaults.
;; Disabling composition in headers is safe (no ligatures needed there).
;;
;;; Code:

(require 'user-constants)
(require 'system-lib)
(require 'mu4e-attachments)
(require 'keybindings)  ;; provides cj/custom-keymap

;; cj/custom-keymap's real binding is in keybindings.el, which init.el loads
;; first. The use-package org-msg :preface below wraps in eval-and-compile, so
;; standalone byte-compile evaluates `keymap-set` on it at compile time. This
;; shim defines cj/custom-keymap then; defvar is a no-op once the real keymap
;; is in place at load time.
(eval-and-compile
  (defvar cj/custom-keymap (make-sparse-keymap)))

(defvar smtpmail-debug-info nil)
(defvar sendmail-program nil)
(defvar send-mail-function nil)
(defvar message-send-mail-function nil)
(defvar message-sendmail-envelope-from nil)

(defcustom cj/smtpmail-debug-enabled nil
  "Non-nil means enable verbose SMTP transport debug logging.

Keep this nil during normal startup. SMTP debug output is useful for
troubleshooting mail delivery problems, but it can expose sensitive mail
transport details in debug buffers."
  :type 'boolean
  :group 'mail)

(defun cj/set-smtpmail-debug (enabled)
  "Set SMTP transport debug logging according to ENABLED."
  (interactive
   (list (y-or-n-p "Enable SMTP transport debug logging? ")))
  (setq cj/smtpmail-debug-enabled enabled)
  (setq smtpmail-debug-info enabled)
  (message "SMTP transport debug logging %s"
           (if enabled "enabled" "disabled")))

(defun cj/toggle-smtpmail-debug ()
  "Toggle verbose SMTP transport debug logging for troubleshooting."
  (interactive)
  (cj/set-smtpmail-debug (not smtpmail-debug-info)))

(defun cj/mail--mbsync-command ()
  "Return the mu4e mail sync command, or nil if mbsync is unavailable."
  (when-let ((mbsync (cj/executable-find-or-warn
                      "mbsync" "mu4e mail synchronization" 'mail-config)))
    (concat (shell-quote-argument mbsync) " -a")))

(defun cj/mail-configure-smtpmail ()
  "Configure SMTP mail transport when msmtp is available."
  (setq smtpmail-debug-info cj/smtpmail-debug-enabled)
  (if-let ((msmtp (cj/executable-find-or-warn
                   "msmtp" "SMTP mail sending" 'mail-config)))
      (setq sendmail-program msmtp
            send-mail-function 'message-send-mail-with-sendmail
            message-send-mail-function 'message-send-mail-with-sendmail
            message-sendmail-envelope-from 'header)
    (setq sendmail-program nil)))

;; -------------------- HarfBuzz Crash Fix: Disable Composition ---------------
;; Disable auto-composition in mu4e headers to prevent SIGSEGV from HarfBuzz
;; when shaping emoji characters in email subjects. See Commentary above.

(defun cj/disable-auto-composition ()
  "Disable `auto-composition-mode' in the current buffer."
  (auto-composition-mode -1))

(add-hook 'mu4e-headers-mode-hook #'cj/disable-auto-composition)

;; ------------------------------ Mark All Headers -----------------------------
;; convenience function to mark all headers for an action

(defun cj/mu4e-mark-all-headers ()
  "Mark all headers for a later action.

Prompts user for the action when executing."
  (interactive)
  (mu4e-headers-mark-for-each-if
   (cons 'something nil)
   (lambda (_msg _param) t)))

;; ---------------------------------- SMTPmail ---------------------------------
;; send mail to smtp host from smtpmail temp buffer.

(use-package smtpmail
  :ensure nil ;; built-in
  :defer .5
  :config
  (cj/mail-configure-smtpmail))

;; --------------------------------- Mu4e Email --------------------------------

(autoload 'mu4e "mu4e" "Launch mu4e email client." t)
(keymap-global-set "C-c m" #'mu4e)

(use-package mu4e
  :ensure nil  ;; mu4e gets installed by installing 'mu' via the system package manager
  :load-path "/usr/share/emacs/site-lisp/mu4e/"
  :commands (mu4e mu4e-update-index)
  :bind
  ((:map mu4e-headers-mode-map
    ("M" . cj/mu4e-mark-all-headers)
    ("D" . mu4e-headers-mark-for-trash)
    ("d" . mu4e-headers-mark-for-delete))
   (:map mu4e-view-mode-map
    ("r" . mu4e-compose-wide-reply)
    ("R" . mu4e-compose-reply)))
  :hook
  (mu4e-view-mode . turn-on-visual-line-mode)
  :config
  (setq gnus-blocked-images "http")                                       ;; block external images (i.e., 1 px trackers)
  (setq mail-user-agent 'mu4e-user-agent)                                 ;; default to mu4e for email
  (setq message-citation-line-format "On %a %d %b %Y at %R, %f wrote:\n") ;; helps show up properly in Outlook/Gmail threads
  (setq message-citation-line-function 'message-insert-formatted-citation-line)
  ;; Kill the compose buffer on send/exit so compose buffers don't accumulate.
  ;; Single home for this policy: org-msg only reads this variable (to decide
  ;; whether to widen-and-undo its edits) and never sets it, so the value set
  ;; here governs both plain mu4e and org-msg compose buffers.
  (setq message-kill-buffer-on-exit t)
  (setq mu4e-change-filenames-when-moving t)                              ;; avoid gmail dup UID issues: https://goo.gl/RTCgVa
  (setq mu4e-completing-read-function 'completing-read)                   ;; use generic completing read, rather than ido
  (setq mu4e-compose-context-policy 'ask)                                 ;; ask for context if no context matches

  ;; (setq mu4e-compose-format-flowed t)                                       ;; plain text mails must flow correctly for recipients
  (setq mu4e-compose-keep-self-cc t)                                      ;; keep me in the cc list
  (setq mu4e-compose-signature-auto-include nil)                          ;; don't include signature by default
  (setq mu4e-confirm-quit nil)                                            ;; don't ask when quitting
  (setq mu4e-context-policy 'pick-first)                                  ;; start with the first (default) context
  (setq mu4e-headers-auto-update nil)                                     ;; updating headers buffer on email is too jarring
  (setq mu4e-root-maildir mail-dir)                                       ;; root directory for all email accounts
  (setq mu4e-maildir mail-dir)                                            ;; same as above (for newer mu4e)
  (setq mu4e-sent-messages-behavior 'delete)                              ;; don't save to "Sent", IMAP does this already
  (setq mu4e-show-images t)                                               ;; show embedded images
  ;; (setq mu4e-update-interval 600)                                      ;; check for new mail every 10 minutes (600 seconds)
  ;; TEMPORARILY DISABLED: Causing password prompts that interrupt work
  (setq mu4e-hide-index-messages t)                                       ;; don't show indexing messages buffer
  (setq mu4e-headers-from-or-to-prefix '("" . "➜ "))

  ;; Format=flowed for better plain text email handling
  ;; This will be automatically disabled when org-msg is active
  (setq mu4e-compose-format-flowed t)

  (setq mu4e-html2text-command 'mu4e-shr2text)  ;; email conversion to html via shr2text
  (setq mu4e-mu-binary (executable-find "mu"))
  (setq mu4e-get-mail-command (cj/mail--mbsync-command))                  ;; command to sync mail
  (setq mu4e-user-mail-address-list '("c@cjennings.net"
                                      "craigmartinjennings@gmail.com"
                                      "craig.jennings@deepsat.com"))
  (setq mu4e-index-update-error-warning nil) ;; don't warn me about spurious sync issues

  ;; ------------------------------ Mu4e Contexts ------------------------------

  (setq mu4e-contexts
        (list
         (make-mu4e-context
          :name "gmail.com"
          :match-func
          (lambda (msg)
            (when msg
              (string-prefix-p "/gmail" (mu4e-message-field msg :maildir))))
          :vars '((user-mail-address        . "craigmartinjennings@gmail.com")
                  (user-full-name           . "Craig Jennings")
                  (mu4e-drafts-folder       . "/gmail/Drafts")
                  (mu4e-sent-folder         . "/gmail/Sent")
                  (mu4e-starred-folder      . "/gmail/Starred")
                  (mu4e-trash-folder        . "/gmail/Trash")))

         (make-mu4e-context
          :name "cjennings.net"
          :match-func
          (lambda (msg)
            (when msg
              (string-prefix-p "/cmail" (mu4e-message-field msg :maildir))))
          :vars '((user-mail-address    . "c@cjennings.net")
                  (user-full-name       . "Craig Jennings")
                  (mu4e-drafts-folder   . "/cmail/Drafts")
                  (mu4e-sent-folder     . "/cmail/Sent")))

         (make-mu4e-context
          :name "deepsat.com"
          :match-func
          (lambda (msg)
            (when msg
              (string-prefix-p "/dmail" (mu4e-message-field msg :maildir))))
          :vars '((user-mail-address        . "craig.jennings@deepsat.com")
                  (user-full-name           . "Craig Jennings")
                  (mu4e-drafts-folder       . "/dmail/Drafts")
                  (mu4e-sent-folder         . "/dmail/Sent")
                  (mu4e-starred-folder      . "/dmail/Starred")
                  (mu4e-trash-folder        . "/dmail/Trash")))))

  (setq mu4e-maildir-shortcuts
        '(("/cmail/Inbox"       . ?i)
          ("/cmail/Sent"        . ?s)
          ("/gmail/Inbox"       . ?I)
          ("/gmail/Sent"        . ?S)
          ("/dmail/Inbox"       . ?d)
          ("/dmail/Sent"        . ?D)))

  ;; ------------------------------ Mu4e Bookmarks -----------------------------

  ;; Landing-page bookmarks: just unread per account, for at-a-glance triage.
  ;; Keys match the account letter (b<letter>): bc cmail, bg gmail, bd deepsat.
  ;; Full account/folder navigation lives under C-; e (cj/email-map).
  (setq mu4e-bookmarks
        `((:name "cjennings unread"
                 :query "maildir:/cmail/INBOX AND flag:unread AND NOT flag:trashed"
                 :key ?c)
          (:name "gmail.com unread"
                 :query "maildir:/gmail/INBOX AND flag:unread AND NOT flag:trashed"
                 :key ?g)
          (:name "deepsat.com unread"
                 :query "maildir:/dmail/INBOX AND flag:unread AND NOT flag:trashed"
                 :key ?d)))

  (defun no-auto-fill ()
    "Turn off \'auto-fill-mode\'."
    (auto-fill-mode -1))
  (add-hook 'mu4e-compose-mode-hook #'no-auto-fill)

  ;; Always BCC myself
  ;; http://www.djcbsoftware.nl/code/mu/mu4e/Compose-hooks.html
  (defun cj/add-cc-bcc-header ()
    "Add CC: and BCC: to myself header."
    (save-excursion (message-add-header
                     (concat "CC: " "\n")
                     ;; pre hook above changes user-mail-address.
                     (concat "Bcc: " user-mail-address "\n"))))
  (add-hook 'mu4e-compose-mode-hook 'cj/add-cc-bcc-header)

  ;; use imagemagick to render images, if available
  (when (fboundp 'imagemagick-register-types)
	(imagemagick-register-types))

  ;; ------------------------------ HTML Settings ------------------------------
  ;; also see org-msg below

  ;; Prefer HTML over plain text when both are available
  (setq mu4e-view-prefer-html t)

  ;; Use a better HTML renderer with more control
  (setq mu4e-html2text-command
		(cond
		 ;; Best option: pandoc (if available)
		 ((executable-find "pandoc")
		  "pandoc -f html -t plain --reference-links")
		 ;; Good option: w3m (better tables/formatting)
		 ((executable-find "w3m")
		  "w3m -dump -T text/html -cols 72 -o display_link_number=true")
		 ;; Fallback: built-in shr
		 (t 'mu4e-shr2text)))

  ;; Configure shr (built-in HTML renderer) for better display
  (setq shr-use-colors nil)          ; Don't use colors in terminal
  (setq shr-use-fonts nil)           ; Don't use variable fonts
  (setq shr-max-image-proportion 0.7) ; Limit image size
  (setq shr-width 72)                ; Set width for HTML rendering
  (setq shr-bullet "• ")             ; Nice bullet points

  ;; Block remote images by default (privacy/security)
  (setq mu4e-view-show-images t)
  (setq mu4e-view-image-max-width 800)

  ;; ------------------------------- View Actions ------------------------------
  ;; define view and article menus

  (defun cj/search-for-sender (msg)
	"Search for messages sent by the sender of the message at point."
	(mu4e-search
	 (concat "from:"
			 (mu4e-contact-email (car (mu4e-message-field msg :from))))))

  ;; Custom function to toggle remote content and bind it in view mode
  (defun cj/mu4e-toggle-remote-images ()
	"Toggle display of remote images in current message."
	(interactive)
	(require 'mu4e-view)
	(setq-local gnus-blocked-images
				(if (equal gnus-blocked-images "http")
					nil
				  "http"))
	(mu4e-view-refresh))

  ;; first letter is the keybinding
  (setq mu4e-headers-actions
		'(("asave attachment"   . mu4e-view-save-attachments)
		  ("csave contact"      . mu4e-action-add-org-contact)
		  ("ssearch for sender" . cj/search-for-sender)
		  ("tshow this thread"  . mu4e-action-show-thread)
		  ("vview in browser"   . mu4e-action-view-in-browser)))

  ;; first letter is the keybinding
  (setq mu4e-view-actions
		'(("asave attachments"     . mu4e-view-save-attachments)
		  ("csave contact"         . mu4e-action-add-org-contact)
		  ("itoggle remote images" . cj/mu4e-toggle-remote-images)
		  ("lsave to attach later" . mu4e-action-capture-message)
		  ("vview in browser"      . mu4e-action-view-in-browser)))
 (setq mu4e-compose-complete-addresses nil)

  ;; ---------------------------- Address Completion ---------------------------

  ;; Disable company-mode in compose buffers
  (defun cj/disable-company-in-mu4e-compose ()
	"Disable company mode in mu4e compose buffers."
	(company-mode -1))

  (add-hook 'mu4e-compose-mode-hook #'cj/disable-company-in-mu4e-compose)

  ;; NOTE: Key bindings for TAB and comma are now handled by
  ;; mu4e-org-contacts-integration module which provides:
  ;; - Smart TAB completion in email headers
  ;; - Comma-triggered completion
  ;; - Integration with org-contacts database

  ;; Also disable company in org-msg-edit-mode
  (with-eval-after-load 'org-msg
	(add-hook 'org-msg-edit-mode-hook #'cj/disable-company-in-mu4e-compose))

  ;; Don't spell-check email addresses and headers
  (defun cj/disable-ispell-in-email-headers ()
	"Disable ispell in email header fields."
	(make-local-variable 'ispell-skip-region-alist)
	(add-to-list 'ispell-skip-region-alist
				 '("^To:\\|^Cc:\\|^Bcc:" . "^[^:]*$"))
	(add-to-list 'ispell-skip-region-alist
				 '("^From:" . "^[^:]*$"))
	(add-to-list 'ispell-skip-region-alist
				 '("^Subject:" . "^[^:]*$")))

  (add-hook 'mu4e-compose-mode-hook #'cj/disable-ispell-in-email-headers)
  (add-hook 'message-mode-hook #'cj/disable-ispell-in-email-headers)
  (add-hook 'org-msg-edit-mode-hook #'cj/disable-ispell-in-email-headers)

  (require 'mu4e-org-contacts-integration)
  (cj/activate-mu4e-org-contacts-integration)) ;; end use-package mu4e


;; ---------------------------------- Org-Msg ----------------------------------
;; user composes org mode; recipient receives html

(use-package org-msg
  :vc (:url "https://github.com/jeremy-compostella/org-msg" :rev :newest)
  :defer 1
  :after (org mu4e)
  :preface
	(defvar-keymap cj/mail-cmail-map
	  :doc "cmail account navigation"
	  "i" (lambda () (interactive) (mu4e-search "maildir:/cmail/INBOX"))
	  "u" (lambda () (interactive) (mu4e-search "maildir:/cmail/INBOX AND flag:unread AND NOT flag:trashed"))
	  "s" (lambda () (interactive) (mu4e-search "maildir:/cmail/INBOX AND flag:flagged"))
	  "l" (lambda () (interactive) (mu4e-search "maildir:/cmail/INBOX AND size:5M..999M")))
	(defvar-keymap cj/mail-dmail-map
	  :doc "deepsat account navigation"
	  "i" (lambda () (interactive) (mu4e-search "maildir:/dmail/INBOX"))
	  "u" (lambda () (interactive) (mu4e-search "maildir:/dmail/INBOX AND flag:unread AND NOT flag:trashed"))
	  "s" (lambda () (interactive) (mu4e-search "maildir:/dmail/INBOX AND flag:flagged"))
	  "l" (lambda () (interactive) (mu4e-search "maildir:/dmail/INBOX AND size:5M..999M")))
	(defvar-keymap cj/mail-gmail-map
	  :doc "gmail account navigation"
	  "i" (lambda () (interactive) (mu4e-search "maildir:/gmail/INBOX"))
	  "u" (lambda () (interactive) (mu4e-search "maildir:/gmail/INBOX AND flag:unread AND NOT flag:trashed"))
	  "s" (lambda () (interactive) (mu4e-search "maildir:/gmail/INBOX AND flag:flagged"))
	  "l" (lambda () (interactive) (mu4e-search "maildir:/gmail/INBOX AND size:5M..999M")))
	(defvar-keymap cj/email-map
	  :doc "Email operations and account navigation"
	  "A" #'org-msg-attach-attach
	  "D" #'org-msg-attach-delete
	  "m" #'cj/mu4e-save-some-attachments
	  "S" #'cj/mu4e-save-all-attachments
	  "c" cj/mail-cmail-map
	  "d" cj/mail-dmail-map
	  "g" cj/mail-gmail-map
	  "s" #'cj/mu4e-save-attachment-here)
	(cj/register-prefix-map "e" cj/email-map)
	(with-eval-after-load 'which-key
	  (which-key-add-key-based-replacements
        "C-; e" "email menu"
        "C-; e A" "attach file"
        "C-; e D" "delete attachment"
        "C-; e m" "select attachments"
        "C-; e S" "save all attachments"
        "C-; e c" "cmail"
        "C-; e c i" "cmail inbox"
        "C-; e c u" "cmail unread"
        "C-; e c s" "cmail starred"
        "C-; e c l" "cmail large"
        "C-; e d" "deepsat"
        "C-; e d i" "deepsat inbox"
        "C-; e d u" "deepsat unread"
        "C-; e d s" "deepsat starred"
        "C-; e d l" "deepsat large"
        "C-; e g" "gmail"
        "C-; e g i" "gmail inbox"
        "C-; e g u" "gmail unread"
        "C-; e g s" "gmail starred"
        "C-; e g l" "gmail large"
        "C-; e s" "save attachment"))
  :bind
  ;; more intuitive keybinding for attachments
  (:map org-msg-edit-mode-map
		("C-c C-a" . org-msg-attach-attach)
		("C-c C-d" . org-msg-attach-delete))
  :config
  ;; inline CSS, no postamble, no TOC, no stars or footers
  (setq org-msg-options "html-postamble:nil H:5 num:nil ^:{} toc:nil author:nil email:nil")

  ;; hide org markup, show inline images
  (setq org-msg-startup "hidestars inlineimages")

  ;; new and html emails get the option for both text and html,
  ;; text emails get text only replies
  (setq org-msg-default-alternatives
		'((new      . (text html))
		  (reply-to-html    . (text html))
		  (reply-to-text    . (text))))

  ;; Convert Org Citations to Blockquote
  (setq org-msg-convert-citation t)

  ;; enforce css usage; default renders too small
  (setq org-msg-enforce-css t)

  ;; Override just the problematic styles with important tags
  (setq org-msg-extra-css
		(concat
		 "<style type=\"text/css\">\n"
		 "body { font-size: 14px !important; line-height: 1.6 !important; }\n"
		 "p { font-size: 14px !important; margin: 10px 0 !important; }\n"
		 "li { font-size: 14px !important; }\n"
		 "pre { font-size: 13px !important; }\n"
		 "code { font-size: 13px !important; }\n"
		 "</style>"))

  ;; turn on org-msg in all compose buffers
  (org-msg-mode +1))

(advice-add #'mu4e-compose-reply
			:after (lambda (&rest _) (org-msg-edit-mode)))
(advice-add #'mu4e-compose-wide-reply
			:after (lambda (&rest _) (org-msg-edit-mode)))

;; which-key labels
(with-eval-after-load 'which-key
  (which-key-add-key-based-replacements "C-c m" "mu4e email"))

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