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;;; calendar-sync-org.el --- Org rendering and atomic file output -*- coding: utf-8; lexical-binding: t; -*-
;; Author: Craig Jennings <c@cjennings.net>
;; Created: 2025-11-16
;;; Commentary:
;;
;; Layer: 3 (Domain Workflow).
;; Category: D.
;; Load shape: library.
;; Top-level side effects: none (defuns only).
;; Runtime requires: subr-x, cj-org-text-lib, calendar-sync-ics.
;; Direct test load: yes (requires calendar-sync-ics explicitly).
;;
;; Output layer of the calendar-sync parser: render a parsed event plist
;; into an Org entry (heading, property drawer, body) and write generated
;; content to disk atomically via a same-directory temp file plus rename,
;; so a reader never sees a half-written calendar.
;;; Code:
(require 'subr-x)
(require 'cj-org-text-lib)
(require 'calendar-sync-ics)
;;; Org Rendering
(defun calendar-sync--event-to-org (event)
"Convert parsed EVENT plist to org entry string.
Produces property drawer with LOCATION, ORGANIZER, STATUS, URL when present.
Description appears as body text after the drawer."
(let* ((summary (cj/org-sanitize-heading
(or (plist-get event :summary) "(No Title)")))
(description (plist-get event :description))
(location (plist-get event :location))
(start (plist-get event :start))
(end (plist-get event :end))
(organizer (plist-get event :organizer))
(status (plist-get event :status))
(url (plist-get event :url))
(timestamp (calendar-sync--format-timestamp start end))
;; Build property drawer entries
(props '()))
;; Collect non-nil properties
(when (and location (not (string-empty-p location)))
(push (format ":LOCATION: %s"
(cj/org-sanitize-property-value location))
props))
(when organizer
(let ((org-name (or (plist-get organizer :cn)
(plist-get organizer :email))))
(when org-name
(push (format ":ORGANIZER: %s"
(cj/org-sanitize-property-value org-name))
props))))
(when (and status (not (string-empty-p status)))
(push (format ":STATUS: %s"
(cj/org-sanitize-property-value status))
props))
(when (and url (not (string-empty-p url)))
(push (format ":URL: %s"
(cj/org-sanitize-property-value url))
props))
(setq props (nreverse props))
;; Build output
(let ((parts (list timestamp (format "* %s" summary))))
;; Add property drawer if any properties exist
(when props
(push ":PROPERTIES:" parts)
(dolist (prop props)
(push prop parts))
(push ":END:" parts))
;; Add description as body text (sanitized to prevent org heading conflicts)
(when (and description (not (string-empty-p description)))
(push (cj/org-sanitize-body-text description) parts))
(string-join (nreverse parts) "\n"))))
;;; Atomic File Output
(defun calendar-sync--write-file (content file)
"Write CONTENT to FILE atomically.
Creates parent directories if needed, then writes a temp file in the same
directory and renames it into place, so org-agenda or chime reading mid-write
never sees a half-written calendar."
(let ((dir (file-name-directory file)))
(unless (file-directory-p dir)
(make-directory dir t))
(let ((tmp (make-temp-file (expand-file-name ".calendar-sync-" dir))))
(with-temp-file tmp
(insert content))
(rename-file tmp file t))))
(provide 'calendar-sync-org)
;;; calendar-sync-org.el ends here
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