(in-package :passepartout)

(defvar *loop-interrupt* nil)

(defvar *scope-resolver* nil
  "If set, function returning current scope keyword. Used by perceive gate.")

(defvar *loop-async-sensors* '(:chat-message :delegation :user-command)
  "Sensors that are processed in dedicated threads.")

(defvar *loop-focus-id* nil
  "The Org ID of the node the user is currently interacting with.")

(defvar *pre-reason-handlers* (make-hash-table :test 'eq)
  "Pre-reason handler registry: sensor keyword → handler function.")

(defun register-pre-reason-handler (sensor fn)
  "Registers FN to handle signals with SENSOR in the perceive gate.
FN receives (signal) and returns T if consumed, nil to continue."
  (setf (gethash sensor *pre-reason-handlers*) fn))

(defun inject-stimulus (raw-message &key stream (depth 0))
  (stimulus-inject raw-message :stream stream :depth depth))

(defun stimulus-inject (raw-message &key stream (depth 0))
  "Inject a raw message into the signal processing pipeline."
  (let* ((payload (getf raw-message :payload))
         (sensor (getf payload :sensor))
         (meta (getf raw-message :meta))
         (async-p (or (getf payload :async-p)
                     (member sensor *loop-async-sensors*))))

    (unless meta
      (setf meta (list :SOURCE :SYSTEM :SESSION-ID "internal")))

    (when stream
      (setf (getf meta :reply-stream) stream))

    (setf (getf raw-message :meta) meta)
    (setf (getf raw-message :depth) depth)

    (if async-p
        (bt:make-thread
         (lambda ()
           (restart-case (process-signal raw-message)
             (skip-event () nil)))
         :name "passepartout-async-task")
        
        (restart-case
            (handler-bind ((error (lambda (c)
                                    (log-message "SYSTEM ERROR: ~a" c)
                                    (invoke-restart 'skip-event))))
              (process-signal raw-message))
          (skip-event ()
            (log-message "SYSTEM RECOVERY: Stimulus dropped."))))))

(defun loop-gate-perceive (signal)
  "Stage 1 of the metabolic pipeline: Normalize sensory input."
  (let* ((payload (getf signal :payload))
          (type (getf signal :type))
          (meta (getf signal :meta))
          (sensor (getf payload :sensor)))
    ;; HITL: intercept approval/denial commands before LLM processing
    (when (and (eq sensor :user-input)
               (stringp (getf payload :text)))
      (let ((text (getf payload :text)))
        (when (ignore-errors (hitl-handle-message text (getf meta :source)))
          (log-message "GATE [Perceive]: HITL command processed — ~a" text)
          (return-from loop-gate-perceive signal))))
    ;; Pre-reason handlers: dispatch custom sensors to registered skill handlers
    (let ((handler (gethash sensor *pre-reason-handlers*)))
      (when handler
        (when (funcall handler signal)
          (return-from loop-gate-perceive signal))))

    (log-message "GATE [Perceive]: ~a (~a) [Source: ~s]"
                 type (or sensor "no-sensor") (getf meta :source))

    (cond ((eq type :EVENT)
            (case sensor
              (:buffer-update
               (let ((ast (getf payload :ast)))
                 (when ast
                   (snapshot-memory)
                   (ingest-ast ast :scope (if *scope-resolver* (funcall *scope-resolver*) :memex)))))
              (:point-update
               (let ((element (getf payload :element)))
                 (when element
                   (snapshot-memory)
                   (setf *loop-focus-id* (getf element :id))
                   (ingest-ast element :scope (if *scope-resolver* (funcall *scope-resolver*) :memex)))))
              (:interrupt
               (setf *loop-interrupt* t))
              ;; HITL: re-injected approved action from dispatcher-approvals-process
              (:approval-required
               (when (getf payload :approved)
                 (log-message "GATE [Perceive]: Approved Flight Plan re-injected")
                  (setf (getf signal :approved) t)
                 (setf (getf signal :approved-action) (getf payload :action))))
              ;; Default sensor: pass through without requiring user-input processing
              (otherwise
               (log-message "GATE [Perceive]: Unknown sensor ~a, passing through" sensor))))
          ((eq type :RESPONSE)
           (log-message "GATE [Perceive]: Act Result -> ~a" (getf payload :status))))

    (setf (getf signal :status) :perceived)
    (setf (getf signal :foveal-focus) *loop-focus-id*)
    signal))

(defun perceive-gate (signal)
  (loop-gate-perceive signal))

(eval-when (:compile-toplevel :load-toplevel :execute)
  (ql:quickload :fiveam :silent t))

(defpackage :passepartout-pipeline-perceive-tests
  (:use :cl :fiveam :passepartout)
  (:export #:pipeline-perceive-suite))

(in-package :passepartout-pipeline-perceive-tests)

(def-suite pipeline-perceive-suite :description "Test suite for Perceive pipeline")
(in-suite pipeline-perceive-suite)

(test test-loop-gate-perceive
  (clrhash passepartout::*memory-store*)
  (let* ((signal (list :type :EVENT :payload (list :sensor :buffer-update :ast (list :type :HEADLINE :properties (list :ID "test-node" :TITLE "Test") :contents nil))))
         (result (loop-gate-perceive signal)))
    (is (eq :perceived (getf result :status)))
    (is (not (null (gethash "test-node" passepartout::*memory-store*))))))

(test test-depth-limiting
  (let ((runaway-signal (list :type :EVENT :depth 11 :payload (list :sensor :heartbeat))))
    (is (null (process-signal runaway-signal)))))