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+;;; test-agenda-query--occurrences.el --- Tests for window + repeats -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for `cj/--agenda-query-occurrences' and the repeater cookie helper.
+;;
+;; Two behaviors under test:
+;;
+;; 1. The window predicate is intersection, not containment. An event running
+;; across the window's start edge is in the window -- on a live surface it is
+;; the thing currently happening.
+;;
+;; 2. A repeating entry contributes one row per occurrence inside the window,
+;; expanded through org's own arithmetic. The base timestamp of a long-lived
+;; repeater sits far in the past, so returning it raw would put a task that is
+;; genuinely due today outside the window entirely.
+
+;;; Code:
+
+(require 'ert)
+(require 'org)
+(require 'org-element)
+(require 'org-agenda)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'agenda-query)
+
+(defun test-agenda-query-occ--epoch (min hour day month year)
+ "Return the epoch for local MIN HOUR DAY MONTH YEAR."
+ (time-convert (encode-time (list 0 min hour day month year nil -1 nil))
+ 'integer))
+
+(defun test-agenda-query-occ--of (raw start end)
+ "Return occurrences of timestamp string RAW within START..END."
+ (cj/--agenda-query-occurrences (org-timestamp-from-string raw) start end))
+
+(defun test-agenda-query-occ--starts (raw start end)
+ "Return just the start epochs of RAW's occurrences within START..END."
+ (mapcar #'car (test-agenda-query-occ--of raw start end)))
+
+;;; ---------- repeater cookie ----------
+
+(ert-deftest test-agenda-query-cookie-normal-all-three-styles ()
+ "Normal: each repeater style round-trips to its raw cookie."
+ (should (equal "+1d" (cj/--agenda-query-repeater-cookie
+ (org-timestamp-from-string "<2026-07-01 Wed +1d>"))))
+ (should (equal "++2w" (cj/--agenda-query-repeater-cookie
+ (org-timestamp-from-string "<2026-07-01 Wed ++2w>"))))
+ (should (equal ".+3m" (cj/--agenda-query-repeater-cookie
+ (org-timestamp-from-string "<2026-07-01 Wed .+3m>")))))
+
+(ert-deftest test-agenda-query-cookie-boundary-none ()
+ "Boundary: a plain timestamp has no cookie, and nil is not a cookie."
+ (should-not (cj/--agenda-query-repeater-cookie
+ (org-timestamp-from-string "<2026-07-01 Wed>")))
+ (should-not (cj/--agenda-query-repeater-cookie nil)))
+
+;;; ---------- window predicate ----------
+
+(ert-deftest test-agenda-query-occ-normal-inside-window ()
+ "Normal: an event wholly inside the window is returned once, with its end."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 8 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 0 18 31 7 2026))
+ (occ (test-agenda-query-occ--of "<2026-07-31 Fri 09:00-10:00>"
+ win-start win-end)))
+ (should (= 1 (length occ)))
+ (should (equal (caar occ) (test-agenda-query-occ--epoch 0 9 31 7 2026)))
+ (should (equal (cdar occ) (test-agenda-query-occ--epoch 0 10 31 7 2026)))))
+
+(ert-deftest test-agenda-query-occ-boundary-overlaps-start-edge ()
+ "Boundary: an event that began before the window but is still running is in.
+This is the 23:00-01:00 case -- the whole reason the predicate is intersects
+rather than starts-inside."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 1 8 2026))
+ (win-end (test-agenda-query-occ--epoch 0 23 1 8 2026)))
+ (should (= 1 (length (test-agenda-query-occ--of
+ "<2026-07-31 Fri 23:00>--<2026-08-01 Sat 01:00>"
+ win-start win-end))))))
+
+(ert-deftest test-agenda-query-occ-boundary-touches-edge-exactly ()
+ "Boundary: an event ending exactly at the window start is still included."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 10 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 0 18 31 7 2026)))
+ (should (= 1 (length (test-agenda-query-occ--of
+ "<2026-07-31 Fri 09:00-10:00>" win-start win-end))))))
+
+(ert-deftest test-agenda-query-occ-boundary-all-day-covers-window ()
+ "Boundary: an all-day entry covers any window inside its day."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 13 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 30 13 31 7 2026))
+ (occ (test-agenda-query-occ--of "<2026-07-31 Fri>" win-start win-end)))
+ (should (= 1 (length occ)))
+ ;; No range in the source, so no end is invented.
+ (should-not (cdar occ))))
+
+(ert-deftest test-agenda-query-occ-boundary-outside-window ()
+ "Boundary: an event finishing before the window opens is excluded."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 12 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 0 18 31 7 2026)))
+ (should-not (test-agenda-query-occ--of "<2026-07-31 Fri 09:00-10:00>"
+ win-start win-end))))
+
+;;; ---------- repeat expansion ----------
+
+(ert-deftest test-agenda-query-occ-normal-daily-repeat-reaches-today ()
+ "Normal: a daily repeater based a month back yields today's occurrence.
+Returning the raw base date would put a task genuinely due today far outside
+the window -- this is the failure the expansion exists to prevent."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026))
+ (starts (test-agenda-query-occ--starts "<2026-07-01 Wed 09:00 +1d>"
+ win-start win-end)))
+ (should (equal starts (list (test-agenda-query-occ--epoch 0 9 31 7 2026))))))
+
+(ert-deftest test-agenda-query-occ-normal-repeat-preserves-duration ()
+ "Normal: an expanded occurrence keeps the base timestamp's duration."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026))
+ (occ (car (test-agenda-query-occ--of "<2026-07-01 Wed 09:00-10:30 +1d>"
+ win-start win-end))))
+ (should occ)
+ (should (equal (car occ) (test-agenda-query-occ--epoch 0 9 31 7 2026)))
+ (should (equal (cdr occ) (test-agenda-query-occ--epoch 30 10 31 7 2026)))))
+
+(ert-deftest test-agenda-query-occ-boundary-one-row-per-occurrence ()
+ "Boundary: a window wider than the interval yields a row per occurrence.
+A count is derivable from rows; rows are not derivable from a count, so the
+row form is what the query returns."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 27 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026))
+ (starts (test-agenda-query-occ--starts "<2026-07-01 Wed 09:00 +1d>"
+ win-start win-end)))
+ (should (= 5 (length starts)))
+ (should (equal starts
+ (list (test-agenda-query-occ--epoch 0 9 27 7 2026)
+ (test-agenda-query-occ--epoch 0 9 28 7 2026)
+ (test-agenda-query-occ--epoch 0 9 29 7 2026)
+ (test-agenda-query-occ--epoch 0 9 30 7 2026)
+ (test-agenda-query-occ--epoch 0 9 31 7 2026))))))
+
+(ert-deftest test-agenda-query-occ-boundary-weekly-lands-on-its-day ()
+ "Boundary: a weekly repeater yields only the days it actually falls on.
+2026-07-01 is a Wednesday, so within Mon 27 -- Fri 31 July only Wed 29 counts."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 27 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026))
+ (starts (test-agenda-query-occ--starts "<2026-07-01 Wed 09:00 +1w>"
+ win-start win-end)))
+ (should (equal starts (list (test-agenda-query-occ--epoch 0 9 29 7 2026))))))
+
+(ert-deftest test-agenda-query-occ-boundary-restart-style-expands ()
+ "Boundary: a .+ repeater expands from its base like any other style.
+
+Org rewrites a restart repeater's base timestamp when the task is completed,
+so for an open task the base IS the last repeat and base-relative expansion is
+what the agenda shows. All three styles agree here."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026))
+ (expected (list (test-agenda-query-occ--epoch 0 9 31 7 2026))))
+ (dolist (raw '("<2026-07-01 Wed 09:00 +1d>"
+ "<2026-07-01 Wed 09:00 ++1d>"
+ "<2026-07-01 Wed 09:00 .+1d>"))
+ (should (equal expected
+ (test-agenda-query-occ--starts raw win-start win-end))))))
+
+(ert-deftest test-agenda-query-occ-boundary-repeat-not-yet-started ()
+ "Boundary: a repeater whose base is after the window yields nothing."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 0 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 31 7 2026)))
+ (should-not (test-agenda-query-occ--starts "<2026-12-01 Tue 09:00 +1d>"
+ win-start win-end))))
+
+(ert-deftest test-agenda-query-occ-boundary-zero-value-repeater ()
+ "Boundary: org treats a zero-value repeater as void, so it behaves as a
+plain timestamp -- absent when its base is outside the window, and present
+exactly once when the base is inside it.
+
+Both halves are asserted deliberately. The absent half alone would also pass
+against an implementation with no repeater support at all, which makes it no
+evidence about zero-value handling."
+ (should-not (test-agenda-query-occ--starts
+ "<2026-07-01 Wed 09:00 +0d>"
+ (test-agenda-query-occ--epoch 0 0 31 7 2026)
+ (test-agenda-query-occ--epoch 59 23 31 7 2026)))
+ (should (equal (list (test-agenda-query-occ--epoch 0 9 1 7 2026))
+ (test-agenda-query-occ--starts
+ "<2026-07-01 Wed 09:00 +0d>"
+ (test-agenda-query-occ--epoch 0 0 1 7 2026)
+ (test-agenda-query-occ--epoch 59 23 1 7 2026)))))
+
+(ert-deftest test-agenda-query-occ-boundary-repeat-in-progress-at-window-start ()
+ "Boundary: a repeating event that began before the window and is still
+running is returned.
+
+The non-repeating path honors intersects-not-contains; the repeating path has
+to as well. Scanning only days inside the window misses this, because the
+occurrence's own day starts earlier: a nightly 22:00-02:00 job is the thing
+actually happening at 03:00, and a renderer that drops it shows an empty slot
+during the event."
+ (let ((raw "<2026-07-01 Wed 22:00 +1d>--<2026-07-02 Thu 02:00>"))
+ (should (= 1 (length (test-agenda-query-occ--of
+ raw
+ (test-agenda-query-occ--epoch 0 0 31 7 2026)
+ (test-agenda-query-occ--epoch 0 6 31 7 2026)))))
+ ;; The same occurrence seen from inside its own evening.
+ (should (= 1 (length (test-agenda-query-occ--of
+ raw
+ (test-agenda-query-occ--epoch 0 21 31 7 2026)
+ (test-agenda-query-occ--epoch 0 23 31 7 2026)))))))
+
+(ert-deftest test-agenda-query-occ-boundary-repeat-extent-follows-dst ()
+ "Boundary: an all-day repeat's extent is recomputed per occurrence day.
+
+US DST ends 2026-11-01, making that day 25 hours long. Carrying the base
+day's length forward as a fixed number of seconds leaves the occurrence
+ending an hour early, so a window late on that day sees nothing while the
+identical non-repeating entry is found."
+ (let ((win-start (test-agenda-query-occ--epoch 30 23 1 11 2026))
+ (win-end (test-agenda-query-occ--epoch 59 23 1 11 2026)))
+ (should (= 1 (length (test-agenda-query-occ--of "<2026-07-01 Wed +1d>"
+ win-start win-end))))
+ ;; The non-repeating control: same day, same window, must agree.
+ (should (= 1 (length (test-agenda-query-occ--of "<2026-11-01 Sun>"
+ win-start win-end))))))
+
+;;; ---------- error cases ----------
+
+(ert-deftest test-agenda-query-occ-error-inverted-window ()
+ "Error: a window whose start is after its end matches nothing.
+Without the guard the intersection test passes for any long-running event,
+which would silently return rows for a nonsense request."
+ (let* ((win-start (test-agenda-query-occ--epoch 0 18 31 7 2026))
+ (win-end (test-agenda-query-occ--epoch 0 8 31 7 2026)))
+ (should-not (test-agenda-query-occ--of "<2026-07-31 Fri 09:00-10:00>"
+ win-start win-end))
+ (should-not (test-agenda-query-occ--of "<2026-07-01 Wed 09:00 +1d>"
+ win-start win-end))))
+
+(ert-deftest test-agenda-query-occ-error-nil-timestamp ()
+ "Error: a nil timestamp yields no occurrences rather than signaling."
+ (should-not (cj/--agenda-query-occurrences nil 0 100)))
+
+(provide 'test-agenda-query--occurrences)
+;;; test-agenda-query--occurrences.el ends here