(defvar *cron-registry* nil)

(defun cron-register (name schedule-fn action-fn)
  "Register a new cron task."
  (push (list :name name :schedule schedule-fn :action action-fn :last-run 0) *cron-registry*))

(defun cron-trigger-loop ()
  "Iterate through registered tasks and trigger those whose schedule matches."
  (dolist (task *cron-registry*)
    (let ((name (getf task :name))
          (schedule (getf task :schedule))
          (action (getf task :action)))
      (when (funcall schedule)
        (kernel-log "CRON - Triggering task: ~a" name)
        (funcall action)
        (setf (getf task :last-run) (get-universal-time))))))

(defun trigger-skill-cron (context)
  (let ((type (getf context :type))
        (payload (getf context :payload)))
    (when (and (eq type :EVENT) (eq (getf payload :sensor) :heartbeat))
      (cron-trigger-loop)
      (trigger-nightly-grooming)
      t)))

(defun parse-org-timestamp (ts-str)
  (let ((match (nth-value 1 (cl-ppcre:scan-to-strings "<(\\d{4})-(\\d{2})-(\\d{2}).*>" ts-str))))
    (if match
        (encode-universal-time 0 0 0 
                               (parse-integer (aref match 2)) 
                               (parse-integer (aref match 1)) 
                               (parse-integer (aref match 0)))
        nil)))

(defun trigger-nightly-grooming ()
  "Checks if the current time is within the nightly grooming window (e.g., 3:00 AM - 4:00 AM)."
  (let* ((now (local-time:now))
         (hour (local-time:timestamp-hour now)))
    (when (= hour 3)
      (kernel-log "CRON - Initiating Nightly Grooming Cycle...")
      (org-agent:inject-stimulus `(:type :EVENT :payload (:sensor :grooming-cycle))))))

(defun context-get-upcoming-deadlines (&optional (days 3))
  (let* ((now (get-universal-time))
         (future-limit (+ now (* days 24 60 60)))
         (all-headlines (org-agent:list-objects-by-type :HEADLINE))
         (upcoming nil))
    (dolist (obj all-headlines)
      (let* ((attrs (org-agent:org-object-attributes obj))
             (deadline-str (getf attrs :DEADLINE))
             (deadline-time (when deadline-str (parse-org-timestamp deadline-str))))
        (when (and deadline-time (< deadline-time future-limit) (> deadline-time (- now 86400)))
          (push (list :title (getf attrs :TITLE) :deadline deadline-str) upcoming))))
    upcoming))

(defun context-get-stalled-waiting-items (&optional (days 3))
  (let* ((now (get-universal-time))
         (past-limit (- now (* days 24 60 60)))
         (all-headlines (org-agent:list-objects-by-type :HEADLINE))
         (stalled nil))
    (dolist (obj all-headlines)
      (let* ((attrs (org-agent:org-object-attributes obj))
             (state (getf attrs :TODO-STATE))
             (last-sync (org-agent:org-object-last-sync obj)))
        (when (and (equal state "WAITING") (< last-sync past-limit))
          (push (list :title (getf attrs :TITLE)) stalled))))
    stalled))

(defun neuro-skill-cron (context)
  (let* ((upcoming (context-get-upcoming-deadlines 3))
         (stalled (context-get-stalled-waiting-items 3))
         (now-str (local-time:format-timestring nil (local-time:now))))
    (format nil "
      CURRENT TIME: ~a
      UPCOMING DEADLINES (Next 3 Days): ~{~a: ~a~%~}
      STALLED WAITING ITEMS (> 3 days old): ~{~a~%~}
    " now-str 
    (loop for item in upcoming append (list (getf item :deadline) (getf item :title)))
    (loop for item in stalled collect (getf item :title)))))