;;; test-pearl-fetch-all-comments.el --- Tests for fetching a full comment thread -*- 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-fetch-all-comments: the keybinding, the in-place
;; Comments-subtree replacement with an exact N/N count, and the unpushed-edit
;; guard that refuses to clobber a locally-edited comment.

;;; Code:

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

(defmacro test-pearl-fac--in-org (content &rest body)
  "Run BODY in an org-mode temp buffer holding CONTENT."
  (declare (indent 1))
  `(let ((org-todo-keywords '((sequence "TODO" "IN-PROGRESS" "|" "DONE"))))
     (with-temp-buffer
       (insert ,content)
       (org-mode)
       (goto-char (point-min))
       ,@body)))

(defconst test-pearl-fac--with-comments
  (concat
   "* My open issues\n"
   "** TODO SE-1: Alpha\n:PROPERTIES:\n:LINEAR-ID: i1\n:LINEAR-IDENTIFIER: SE-1\n:END:\n"
   "The description body.\n"
   "*** Comments 2/5+\n"
   "**** Old Author — 2026-01-01T00:00:00.000Z\n"
   ":PROPERTIES:\n:LINEAR-COMMENT-ID: oc1\n:LINEAR-COMMENT-AUTHOR-ID: u1\n"
   ":LINEAR-COMMENT-SHA256: deadbeef\n:LINEAR-COMMENT-ORG-SHA256: deadbeef\n:END:\n"
   "old comment one\n")
  "An issue with a capped (overflowing) Comments subtree and a stale-hash comment.")

(defconst test-pearl-fac--no-comments
  (concat
   "* My open issues\n"
   "** TODO SE-1: Alpha\n:PROPERTIES:\n:LINEAR-ID: i1\n:LINEAR-IDENTIFIER: SE-1\n:END:\n"
   "The description body.\n")
  "An issue with no Comments subtree.")

(defun test-pearl-fac--goto-issue ()
  "Move point onto the issue heading."
  (goto-char (point-min))
  (re-search-forward "^\\*\\* TODO SE-1")
  (beginning-of-line))

;;; keybinding

(ert-deftest test-pearl-fetch-all-comments-bound ()
  "The command is bound under the fetch sub-keymap at `c'."
  (should (eq 'pearl-fetch-all-comments (lookup-key pearl-fetch-map (kbd "c")))))

;;; subtree replacement

(ert-deftest test-pearl-replace-comments-subtree-replaces-and-counts ()
  "Replacing swaps the capped thread for the full set with an exact N/N count."
  (test-pearl-fac--in-org test-pearl-fac--with-comments
    (test-pearl-fac--goto-issue)
    (pearl--replace-comments-subtree
     (list '(:id "c1" :author "Bob" :created-at "2026-02-01T00:00:00.000Z" :body "new one")
           '(:id "c2" :author "Sue" :created-at "2026-02-02T00:00:00.000Z" :body "new two")))
    (goto-char (point-min))
    (should (search-forward "Comments 2/2" nil t))
    (goto-char (point-min))
    (should (search-forward "The description body." nil t))
    (goto-char (point-min))
    (should (search-forward "new one" nil t))
    (goto-char (point-min))
    (should-not (search-forward "old comment one" nil t))))

(ert-deftest test-pearl-replace-comments-subtree-creates-when-absent ()
  "An issue with no Comments subtree gets one inserted."
  (test-pearl-fac--in-org test-pearl-fac--no-comments
    (test-pearl-fac--goto-issue)
    (pearl--replace-comments-subtree
     (list '(:id "c1" :author "Bob" :created-at "2026-02-01T00:00:00.000Z" :body "hello")))
    (goto-char (point-min))
    (should (search-forward "Comments 1/1" nil t))
    (goto-char (point-min))
    (should (search-forward "hello" nil t))
    (goto-char (point-min))
    (should (search-forward "The description body." nil t))))

(ert-deftest test-pearl-replace-comments-subtree-empty-clears ()
  "An empty thread clears the Comments subtree."
  (test-pearl-fac--in-org test-pearl-fac--with-comments
    (test-pearl-fac--goto-issue)
    (pearl--replace-comments-subtree nil)
    (goto-char (point-min))
    (should-not (search-forward "Comments" nil t))
    (goto-char (point-min))
    (should (search-forward "The description body." nil t))))

;;; unpushed-edit guard

(ert-deftest test-pearl-unpushed-comment-edits-p-detects-dirty ()
  "A comment whose body no longer matches its stored hash is an unpushed edit."
  (test-pearl-fac--in-org test-pearl-fac--with-comments
    (test-pearl-fac--goto-issue)
    (should (pearl--unpushed-comment-edits-p))))

(ert-deftest test-pearl-unpushed-comment-edits-p-clean-when-no-comments ()
  "An issue with no comments has no unpushed comment edits."
  (test-pearl-fac--in-org test-pearl-fac--no-comments
    (test-pearl-fac--goto-issue)
    (should-not (pearl--unpushed-comment-edits-p))))

;;; save-after-fetch helper

(ert-deftest test-pearl-save-if-visiting-noop-without-file ()
  "In a non-file buffer the save helper is a no-op, not an error."
  (with-temp-buffer
    (insert "x")
    (should-not (pearl--save-if-visiting))))

(ert-deftest test-pearl-save-if-visiting-saves-file-buffer ()
  "In a file-visiting buffer the helper writes the buffer to disk."
  (let ((f (make-temp-file "pearl-save-" nil ".org")))
    (unwind-protect
        (let ((buf (find-file-noselect f)))
          (unwind-protect
              (with-current-buffer buf
                (insert "hello pearl")
                (should (buffer-modified-p))
                (pearl--save-if-visiting)
                (should-not (buffer-modified-p))
                (should (string-match-p
                         "hello pearl"
                         (with-temp-buffer (insert-file-contents f) (buffer-string)))))
            (kill-buffer buf)))
      (delete-file f))))

(provide 'test-pearl-fetch-all-comments)
;;; test-pearl-fetch-all-comments.el ends here