;;; test-pearl-org-write.el --- Tests for pearl org file write-back -*- lexical-binding: t; -*-

;; Copyright (C) 2026 Craig Jennings

;; Author: Craig Jennings <c@cjennings.net>

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Tests for `pearl--update-org-from-issues', the buffer-aware
;; write-back.  Uses real temp files (file I/O is the behavior under test);
;; the three branches are no-buffer, clean-buffer, and dirty-buffer.

;;; Code:

(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))

(defvar test-pearl--sample-issues
  '((:id "u" :identifier "ENG-1" :title "T" :priority 3 :state (:name "Todo")))
  "One normalized issue, enough to render a recognizable org entry.")

(defmacro test-pearl--with-org-file (var &rest body)
  "Bind VAR to a fresh temp .org path and run BODY, cleaning up after.
The state mapping is bound so rendering is deterministic."
  (declare (indent 1))
  `(let* ((,var (make-temp-file "linear-test-" nil ".org"))
          (pearl-org-file-path ,var)
          (pearl-state-to-todo-mapping '(("Todo" . "TODO"))))
     (unwind-protect
         (progn ,@body)
       (let ((b (find-buffer-visiting ,var)))
         (when b
           (with-current-buffer b (set-buffer-modified-p nil))
           (kill-buffer b)))
       (when (file-exists-p ,var) (delete-file ,var)))))

(ert-deftest test-pearl-update-org-no-buffer-writes-file ()
  "With no buffer visiting the file, issues are written to disk."
  (test-pearl--with-org-file tmp
    (let ((b (find-buffer-visiting tmp))) (when b (kill-buffer b)))
    (pearl--update-org-from-issues test-pearl--sample-issues)
    (let ((content (with-temp-buffer (insert-file-contents tmp) (buffer-string))))
      (should (string-match-p "#\\+title: Linear" content))
      (should (string-match-p "#\\+LINEAR-SOURCE: " content))
      (should (string-match-p "\\*\\* TODO \\[#C\\] T" content)))))

(ert-deftest test-pearl-update-org-clean-buffer-replaces-contents ()
  "A clean visiting buffer is replaced in place and saved."
  (test-pearl--with-org-file tmp
    (let ((buf (find-file-noselect tmp)))
      (with-current-buffer buf
        (insert "old content")
        (save-buffer))
      (pearl--update-org-from-issues test-pearl--sample-issues)
      (with-current-buffer buf
        (should-not (buffer-modified-p))
        (should (string-match-p "\\*\\* TODO \\[#C\\] T" (buffer-string)))
        (should-not (string-match-p "old content" (buffer-string)))))))

(ert-deftest test-pearl-update-org-dirty-buffer-not-overwritten ()
  "A buffer with unsaved edits is left untouched, not clobbered."
  (test-pearl--with-org-file tmp
    (let ((buf (find-file-noselect tmp)))
      (with-current-buffer buf
        (insert "unsaved edits"))
      (pearl--update-org-from-issues test-pearl--sample-issues)
      (with-current-buffer buf
        (should (buffer-modified-p))
        (should (string-match-p "unsaved edits" (buffer-string)))
        (should-not (string-match-p "ENG-1" (buffer-string)))))))

(provide 'test-pearl-org-write)
;;; test-pearl-org-write.el ends here