#+TITLE: Passepartout TUI — Controller
#+PROPERTY: header-args:lisp :tangle ../lisp/gateway-tui-main.lisp

* Controller

Event handlers + daemon I/O + main loop.

** Contract

1. (on-key ch): dispatches key presses: Enter triggers send (extracts
   input buffer, pushes history, sends to daemon, clears buffer),
   ~\\ + Enter~ inserts a literal newline (multi-line input),
   ~/help~ lists all commands, ~/eval <expr>~ evaluates a Lisp
   expression, ~/focus <proj>~ switches project context,
   ~/scope <scope>~ changes context scope, ~/unfocus~ pops context,
   Tab completes command names, Backspace deletes, arrows scroll
   chat and history. Non-printable keys are ignored.
2. (on-daemon-msg msg): processes inbound daemon messages. Routes
   text responses to chat display (:agent), handshake to system
   messages, routes errors to log via ~log-message~.
3. (send-daemon msg): serializes and sends a message to the daemon
   over the framed TCP protocol.
4. (tui-main): the main loop — connects to daemon, initializes
   Croatoan windows, optionally starts Swank REPL, runs
   render/input event loop at ~30fps.

** Event Handlers
#+begin_src lisp
(in-package :passepartout.gateway-tui)

(defun on-key (&rest args)
  ;; Normalize: get-char returns raw ncurses integer codes (e.g. 263 for
  ;; backspace). Croatoan's code-key + key-name convert them to keywords
  ;; so the cond below can use eq.
  (let* ((raw (car args))
         (ch (if (and (integerp raw) (> raw 255))
                 (let* ((k (code-key raw))
                        (name (and k (key-name k))))
                   (or name raw))
                 raw)))
    (cond
      ;; Enter
      ((or (eq ch :enter) (eql ch 13) (eql ch 10)
           (eql ch #\Newline) (eql ch #\Return))
        ;; Multi-line: if buffer ends with \, strip it and insert newline
        (if (and (st :input-buffer) (eql (first (st :input-buffer)) #\\))
            (progn (pop (st :input-buffer))
                   (push #\Newline (st :input-buffer))
                   (setf (st :dirty) (list nil nil t)))
            (let ((text (string-trim '(#\Space #\Tab) (input-string))))
              (when (> (length text) 0)
                (push text (st :input-history))
                (setf (st :input-hpos) 0)
                (setf (st :scroll-offset) 0)
                (cond
                  ;; /help command
                  ((string-equal text "/help")
                   (add-msg :system
                    "/eval <expr>   Evaluate Lisp expression")
                   (add-msg :system
                    "/focus <proj>  Set project context")
                   (add-msg :system
                    "/scope <s>     Change scope (memex/session/project)")
                   (add-msg :system
                    "/unfocus       Pop context stack")
                   (add-msg :system
                    "/theme         Show current color theme")
                   (add-msg :system
                    "/help          Show this help")
                   (add-msg :system
                    "\\ + Enter      Multi-line input"))
                  ;; /theme command
                  ((string-equal text "/theme")
                   (add-msg :system
                    (format nil "Theme: user=~a agent=~a system=~a input=~a"
                            (getf *tui-theme* :user)
                            (getf *tui-theme* :agent)
                            (getf *tui-theme* :system)
                            (getf *tui-theme* :input))))
                  ;; /eval command
                  ((and (>= (length text) 6)
                        (string-equal (subseq text 0 6) "/eval "))
                   (handler-case
                       (let* ((*read-eval* t)
                              (*package* (find-package :passepartout.gateway-tui))
                              (r (eval (read-from-string (subseq text 6)))))
                         (add-msg :system (format nil "=> ~s" r)))
                     (error (c) (add-msg :system (format nil "=> ✗ ~a" c)))))
                  ;; /focus <project> — set project context
                  ((and (>= (length text) 7)
                        (string-equal (subseq text 0 7) "/focus "))
                   (let ((project (string-trim '(#\Space) (subseq text 7))))
                     (if (and (fboundp 'focus-project) (> (length project) 0))
                         (progn (funcall 'focus-project project nil)
                                (add-msg :system (format nil "Focused on project: ~a" project)))
                         (add-msg :system "Usage: /focus <project-name>"))))
                  ;; /scope <scope> — change context scope
                  ((and (>= (length text) 7)
                        (string-equal (subseq text 0 7) "/scope "))
                   (let ((scope-str (string-trim '(#\Space) (subseq text 7))))
                     (cond
                       ((and (fboundp 'focus-session) (string-equal scope-str "session"))
                        (funcall 'focus-session)
                        (add-msg :system "Scope: session"))
                       ((and (fboundp 'focus-project) (string-equal scope-str "project"))
                        (funcall 'focus-project nil nil)
                        (add-msg :system "Scope: project"))
                       ((and (fboundp 'focus-memex) (string-equal scope-str "memex"))
                        (funcall 'focus-memex)
                        (add-msg :system "Scope: memex"))
                       (t (add-msg :system "Usage: /scope memex|session|project")))))
                  ;; /unfocus — pop context
                  ((and (>= (length text) 8)
                        (string-equal (subseq text 0 8) "/unfocus"))
                   (if (fboundp 'unfocus)
                       (progn (funcall 'unfocus)
                              (add-msg :system "Popped context"))
                       (add-msg :system "Context manager not loaded")))
                   ;; /quit — save history and exit
                   ((or (string-equal text "/quit") (string-equal text "/q"))
                    (let ((hist-file (merge-pathnames ".cache/passepartout/history"
                                                      (user-homedir-pathname))))
                      (uiop:ensure-all-directories-exist (list hist-file))
                      (with-open-file (out hist-file :direction :output
                                           :if-exists :supersede :if-does-not-exist :create)
                        (dolist (entry (reverse (st :input-history)))
                          (write-line entry out))))
                    (add-msg :system "* Goodbye *")
                    (send-daemon (list :type :event :payload '(:action :quit)))
                    (setf (st :running) nil))
                   ;; /reconnect — re-establish daemon connection
                   ((string-equal text "/reconnect")
                    (disconnect-daemon)
                    (connect-daemon))
                   ;; Normal message
                  (t
                   (add-msg :user text)
                   (setf (st :busy) t)
                   (send-daemon (list :type :event
                                     :payload (list :sensor :user-input :text text)))))
                 (setf (st :input-buffer) nil)
                 (setf (st :cursor-pos) 0)
                 (setf (st :dirty) (list t t t))))))
       ;; Tab — command completion
       ((or (eql ch 9) (eq ch :tab))
        (let ((text (input-string)))
          (when (and (> (length text) 1) (eql (char text 0) #\/))
            (let* ((cmds '("/eval" "/focus" "/scope" "/unfocus" "/help" "/theme"))
                   (match (find text cmds :test
                                (lambda (in cmd)
                                  (and (>= (length cmd) (length in))
                                       (string-equal cmd in :end1 (length in)))))))
              (when match
                (setf (st :input-buffer) (reverse (coerce match 'list)))
                (when (member match '("/eval" "/focus" "/scope") :test #'string=)
                  (push #\Space (st :input-buffer)))
                (setf (st :dirty) (list nil nil t)))))))
        ;; Backspace
        ((or (eq ch :backspace) (eql ch 127) (eql ch 8)
             (eql ch #\Backspace))
        (input-delete-char)
        (setf (st :dirty) (list nil nil t)))
       ;; Left arrow
       ((or (eq ch :left) (eql ch 260))
        (when (> (or (st :cursor-pos) 0) 0)
          (decf (st :cursor-pos))
          (setf (st :dirty) (list nil nil t))))
       ;; Right arrow
       ((or (eq ch :right) (eql ch 261))
        (when (< (or (st :cursor-pos) 0) (length (st :input-buffer)))
          (incf (st :cursor-pos))
          (setf (st :dirty) (list nil nil t))))
      ;; Up arrow
       ((or (eq ch :up) (eql ch 259))
        (let* ((h (st :input-history)) (p (st :input-hpos)))
          (when (and h (< p (1- (length h))))
            (incf (st :input-hpos))
            (setf (st :input-buffer)
                  (reverse (coerce (nth (st :input-hpos) h) 'list)))
            (setf (st :dirty) (list nil nil t)))))
       ;; Down arrow
       ((or (eq ch :down) (eql ch 258))
        (when (> (st :input-hpos) 0)
          (decf (st :input-hpos))
          (let ((h (st :input-history)))
            (setf (st :input-buffer)
                  (if (and h (< (st :input-hpos) (length h)))
                      (reverse (coerce (nth (st :input-hpos) h) 'list))
                      nil))
            (setf (st :dirty) (list nil nil t)))))
       ;; PageUp
       ((or (eq ch :ppage) (eql ch 339))
        (let ((max-offset (max 0 (- (length (st :messages)) 1))))
          (setf (st :scroll-offset) (min max-offset (+ (st :scroll-offset) 5))))
        (setf (st :dirty) (list nil t nil)))
       ;; PageDown
       ((or (eq ch :npage) (eql ch 338))
        (setf (st :scroll-offset) (max 0 (- (st :scroll-offset) 5)))
        (setf (st :dirty) (list nil t nil)))
       ;; Printable
       (t
        (let ((chr (typecase ch
                     (character ch)
                     (integer (code-char ch))
                     (t nil))))
          (when (and chr (graphic-char-p chr))
            (input-insert-char chr)
            (setf (st :dirty) (list nil nil t))))))))

(defun on-daemon-msg (msg)
  (let* ((payload (getf msg :payload))
         (text (getf payload :text))
         (action (getf payload :action)))
    (cond
      (text (setf (st :busy) nil)
            (add-msg :agent text))
      ((eq action :handshake)
       (add-msg :system (format nil "Connected v~a" (getf payload :version))))
      (t (add-msg :agent (format nil "~a" msg))))))
#+end_src

** Daemon Communication
#+begin_src lisp
(defun send-daemon (msg)
  (let ((s (st :stream)))
    (when (and s (open-stream-p s))
      (handler-case
          (progn
            (format s "~a" (frame-message msg))
            (finish-output s))
        (error () nil)))))

(defun recv-daemon (s)
  (handler-case
      (let* ((hdr (make-string 6)) (n 0))
        (loop while (< n 6)
              do (let ((ch (read-char s nil)))
                    (unless ch (return-from recv-daemon nil))
                    (setf (char hdr n) ch) (incf n)))
        (let* ((len (parse-integer hdr :radix 16 :junk-allowed t))
               (buf (make-string (or len 0))))
          (when (and len (> len 0))
            (loop for i from 0 below len
                  do (let ((ch (read-char s nil)))
                        (unless ch (return-from recv-daemon nil))
                        (setf (char buf i) ch)))
            (let ((*read-eval* nil))
              (read-from-string buf)))))
    (error () nil)))

(defun reader-loop (s)
  (let ((consecutive-nils 0))
    (loop while (and (st :running) (open-stream-p s))
          do (let ((msg (recv-daemon s)))
               (if msg
                   (progn (queue-event (list :type :daemon :payload msg))
                          (setf consecutive-nils 0))
                   (progn (sleep 0.5)
                          (incf consecutive-nils)
                          (when (> consecutive-nils 10)
                            (queue-event (list :type :disconnected))
                            (return))))))))

(defun load-history ()
  "Load input history from disk on TUI startup."
  (let ((hist-file (merge-pathnames ".cache/passepartout/history"
                                    (user-homedir-pathname))))
    (when (uiop:file-exists-p hist-file)
      (with-open-file (in hist-file :direction :input)
        (loop for line = (read-line in nil nil)
              while line
              do (push line (st :input-history))))
      (setf (st :input-history) (nreverse (st :input-history))))))
#+end_src

** Connection
#+begin_src lisp
(defun connect-daemon (&optional (host "127.0.0.1") (port 9105))
  (add-msg :system "* Connecting to daemon... *")
  (loop for attempt from 1 to 3
        for backoff = 0 then 3
        do (sleep backoff)
           (handler-case
               (let ((s (usocket:socket-connect host port :timeout 5)))
                 (setf (st :stream) (usocket:socket-stream s)
                       (st :connected) t)
                 (bt:make-thread (lambda () (reader-loop (st :stream)))
                                :name "tui-reader")
                 (add-msg :system (format nil "* Connected v~a *" "0.3.0"))
                 (return-from connect-daemon t))
             (usocket:connection-refused-error (c)
               (when (= attempt 3)
                 (add-msg :system (format nil "* No daemon on port ~a after ~a attempts *"
                                         port attempt))))
             (error (c)
               (add-msg :system (format nil "* Connection attempt ~a failed: ~a *"
                                        attempt c))
               (when (= attempt 3)
                 (add-msg :system "* TIP: run 'passepartout daemon' first *")))))
  nil)

(defun disconnect-daemon ()
  (when (st :stream)
    (ignore-errors (close (st :stream)))
    (setf (st :stream) nil (st :connected) nil)
    (add-msg :system "* Disconnected *")))
#+end_src

** Main Loop
#+begin_src lisp
(defun tui-main ()
  (init-state)
  (load-history)
  (with-screen (scr :input-blocking nil :input-echoing nil :cursor-visible nil)
    (let* ((h (or (height scr) 24))
           (w (or (width scr) 80))
           (sw (make-instance 'window :height 3 :width (- w 2) :y 0 :x 1))
           (ch (- h 5))
           (cw (make-instance 'window :height ch :width (- w 2) :y 3 :x 1))
           (iw (make-instance 'window :height 1 :width (- w 2) :y (- h 1) :x 1))
            (swank-port (or (ignore-errors
                              (parse-integer (uiop:getenv "TUI_SWANK_PORT")))
                            4006)))
       (setf (function-keys-enabled-p iw) t
             (input-blocking iw) nil
             (st :dirty) (list t t t)
             ;; Store windows in state for SIGWINCH handler
             (st :scr) scr (st :sw) sw (st :cw) cw (st :iw) iw)
       (connect-daemon)
       (when (> swank-port 0)
         (handler-case
             (progn
               (ql:quickload :swank :silent t)
               (funcall (find-symbol "CREATE-SERVER" "SWANK")
                        :port swank-port :dont-close t)
               (add-msg :system
                        (format nil "* Swank ~d  M-x slime-connect *" swank-port)))
           (error ()
             (add-msg :system "* Swank unavailable *"))))
       ;; Initial render before the main loop — otherwise the screen stays
       ;; blank until the first keystroke (get-char blocks).
       (redraw sw cw ch iw)
       (refresh scr)
       (loop while (st :running) do
        (dolist (ev (drain-queue))
          (cond
            ((eq (getf ev :type) :daemon)
             (on-daemon-msg (getf ev :payload)))
            ((eq (getf ev :type) :disconnected)
             (setf (st :connected) nil
                   (st :busy) nil)
             (add-msg :system "* Connection lost — type /reconnect to retry *"))))
        (let ((ch (get-char iw)))
          (cond
            ((or (not ch) (equal ch -1)) nil)
            ;; KEY_RESIZE — terminal was resized (SIGWINCH from ncurses)
            ((eql ch 410)
             (let* ((new-h (or (height scr) 24))
                    (new-w (or (width scr) 80))
                    (new-ch (- new-h 5)))
               (setq sw (make-instance 'window :height 3 :width (- new-w 2) :y 0 :x 1)
                     ch new-ch
                     cw (make-instance 'window :height new-ch :width (- new-w 2) :y 3 :x 1)
                     iw (make-instance 'window :height 1 :width (- new-w 2) :y (- new-h 1) :x 1)
                     w new-w
                     h new-h)
               (setf (function-keys-enabled-p iw) t
                     (input-blocking iw) nil
                     (st :dirty) (list t t t)
                     (st :sw) sw (st :cw) cw (st :iw) iw)
               (redraw sw cw ch iw)
               (refresh scr)))
            (t (on-key ch))))
        (redraw sw cw ch iw)
        (refresh scr)
        (sleep 0.03))
       (disconnect-daemon))))

#+end_src

* Test Suite
#+begin_src lisp
(eval-when (:compile-toplevel :load-toplevel :execute)
  (ql:quickload :fiveam :silent t))

(defpackage :passepartout-tui-tests
  (:use :cl :passepartout :passepartout.gateway-tui)
  (:export #:tui-suite))

(in-package :passepartout-tui-tests)

(fiveam:def-suite tui-suite :description "Verification of the TUI model and event handling")
(fiveam:in-suite tui-suite)

(fiveam:test test-init-state
  "Contract model.1: init-state returns fresh state plist with required keys."
  (init-state)
  (fiveam:is (eq t (st :running)))
  (fiveam:is (eq :chat (st :mode)))
  (fiveam:is (eq nil (st :connected)))
  (fiveam:is (eq nil (st :stream)))
  (fiveam:is (eq nil (st :messages)))
  (fiveam:is (eq 0 (st :scroll-offset)))
  (fiveam:is (eq nil (st :busy))))

(fiveam:test test-add-msg
  "Contract model.2: add-msg appends a message with role, content, and time."
  (init-state)
  (add-msg :user "hello")
  (let* ((msgs (st :messages))
         (msg (first msgs)))
    (fiveam:is (eq :user (getf msg :role)))
    (fiveam:is (string= "hello" (getf msg :content)))
    (fiveam:is (stringp (getf msg :time)))
    (fiveam:is (= 5 (length (getf msg :time))))))

(fiveam:test test-add-msg-dirty-flag
  "Contract model.2: add-msg sets dirty flags for status and chat."
  (init-state)
  (setf (st :dirty) (list nil nil nil))
  (add-msg :system "boot")
  (let ((dirty (st :dirty)))
    (fiveam:is (eq t (first dirty)))
    (fiveam:is (eq t (second dirty)))
    (fiveam:is (eq nil (third dirty)))))

(fiveam:test test-queue-event-roundtrip
  "Contract model.3: queue-event + drain-queue preserves events in order."
  (init-state)
  (queue-event '(:type :key :payload (:ch 13)))
  (queue-event '(:type :daemon :payload (:text "hi")))
  (let ((evs (drain-queue)))
    (fiveam:is (= 2 (length evs)))
    (fiveam:is (equal '(:type :key :payload (:ch 13)) (first evs)))
    (fiveam:is (equal '(:type :daemon :payload (:text "hi")) (second evs)))
    (fiveam:is (null (drain-queue)))))

(fiveam:test test-on-key-enter-sends-user-message
  "Contract 1: on-key with Enter extracts input, adds user message, clears buffer."
  (init-state)
  ;; Simulate typing "test"
  (dolist (ch '(#\t #\e #\s #\t))
    (on-key (char-code ch)))
  (fiveam:is (string= "test" (input-string)))
  ;; Simulate Enter key — ncurses returns 343 (KEY_ENTER) when keypad is enabled
  (on-key 343)
  ;; Input buffer should be cleared
  (fiveam:is (string= "" (input-string)))
  ;; A user message should be in the message list
  (let ((msgs (st :messages)))
    (fiveam:is (>= (length msgs) 1))
    (let ((last (first msgs)))
      (fiveam:is (eq :user (getf last :role)))
      (fiveam:is (string= "test" (getf last :content))))))

(fiveam:test test-on-key-eval-command
  "Contract 1: on-key handles /eval command and displays result."
  (init-state)
  ;; Type "/eval (+ 1 2)"
  (dolist (ch (coerce "/eval (+ 1 2)" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (let ((msgs (st :messages)))
    (fiveam:is (>= (length msgs) 1))
    (let ((last-msg (first msgs)))
      (fiveam:is (eq :system (getf last-msg :role)))
      (fiveam:is (search "=> 3" (getf last-msg :content))))))

(fiveam:test test-on-key-backspace
  "Contract 1: on-key with Backspace removes last character from buffer."
  (init-state)
  (dolist (ch '(#\a #\b #\c))
    (on-key (char-code ch)))
  (fiveam:is (string= "abc" (input-string)))
  ;; ncurses returns 263 (KEY_BACKSPACE) when keypad is enabled
  (on-key 263)
  (fiveam:is (string= "ab" (input-string))))

(fiveam:test test-on-key-focus-command
  "Contract 1: /focus command parses project name."
  (init-state)
  (dolist (ch (coerce "/focus myapp" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (let ((msg (first (st :messages))))
    (fiveam:is (eq :system (getf msg :role)))))

(fiveam:test test-on-key-scope-command
  "Contract 1: /scope command with valid argument."
  (init-state)
  (dolist (ch (coerce "/scope memex" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (let ((msg (first (st :messages))))
    (fiveam:is (eq :system (getf msg :role)))))

(fiveam:test test-on-key-unfocus-command
  "Contract 1: /unfocus command dispatches correctly."
  (init-state)
  (dolist (ch (coerce "/unfocus" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (let ((msg (first (st :messages))))
    (fiveam:is (eq :system (getf msg :role)))))

(fiveam:test test-on-key-tab-completion
  "Contract 1: Tab completes / commands when input starts with /."
  (init-state)
  (dolist (ch (coerce "/ev" 'list))
    (on-key (char-code ch)))
  (on-key 9)
  (fiveam:is (string= "/eval " (input-string))))

(fiveam:test test-on-key-tab-no-slash
  "Contract 1: Tab does nothing when input doesn't start with /."
  (init-state)
  (dolist (ch (coerce "hello" 'list))
    (on-key (char-code ch)))
  (on-key 9)
  (fiveam:is (string= "hello" (input-string))))

(fiveam:test test-on-key-multiline
  "Contract 1: \\ + Enter inserts newline instead of sending."
  (init-state)
  (dolist (ch (coerce "line1" 'list))
    (on-key (char-code ch)))
  (on-key (char-code #\\))
  (on-key 343)
  (fiveam:is (search "line1" (input-string)))
  (fiveam:is (search (string #\Newline) (input-string))))

(fiveam:test test-on-key-help
  "Contract 1: /help displays command list."
  (init-state)
  (dolist (ch (coerce "/help" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (let ((msgs (st :messages)))
    (fiveam:is (>= (length msgs) 3))
    (fiveam:is (some (lambda (m) (search "/eval" (getf m :content))) msgs))))

(fiveam:test test-activity-indicator
  "Contract model: :busy flag is set on send and cleared on agent response."
  (init-state)
  (fiveam:is (eq nil (st :busy)))
  ;; Simulate sending a normal message (sets busy)
  (dolist (ch (coerce "hello" 'list))
    (on-key (char-code ch)))
  (on-key 343)
  (fiveam:is (eq t (st :busy)))
  ;; Simulate receiving an agent response (clears busy)
  (on-daemon-msg '(:type :event :payload (:text "hi back")))
  (fiveam:is (eq nil (st :busy))))

(fiveam:test test-theme
  "Contract view: *tui-theme* provides color mappings."
  (fiveam:is (eq :green (getf *tui-theme* :user)))
  (fiveam:is (eq :white (getf *tui-theme* :agent)))
  (fiveam:is (eq :yellow (getf *tui-theme* :system)))
  (fiveam:is (eq :cyan (getf *tui-theme* :input)))
  (fiveam:is (eq :white (theme-color :unknown-role))))
#+end_src