;;;; Add display-local application cursor settings without reloading WM structs.
(in-package #:cl-user)
(declaim (special lime.x11::*cursor-session-settings*))

(defun lime-cursor-session-definitions ()
  (let ((manifest '(("src/x11/cursor.lisp" "%CURSOR-THEME-NAME-P" "%VALIDATE-UI-CURSOR-STYLE"
                    "%BACKEND-CURSOR-SETTINGS" "BACKEND-CURSOR-REPORT")
                   ("src/x11/launcher.lisp" "BACKEND-LAUNCH-PROGRAM")
                   ("src/x11/backend.lisp" "%DISPATCH-NEXT-EVENT" "STOP-BACKEND")
                   ("src/x11/config.lisp" "APPLY-LIME-CONFIGURATION")))
        (definitions nil) (*package* (find-package :lime.x11)) (*read-eval* nil))
    (dolist (entry manifest)
      (destructuring-bind (file &rest names) entry
        (let ((symbols (mapcar (lambda (name) (intern name *package*)) names)) (found nil))
          (with-open-file (in (merge-pathnames file #p"/home/adan/code/common-lisp/lime/"))
            (loop for form = (read in nil :eof) until (eq form :eof)
                  when (and (consp form) (eq (first form) 'defun) (member (second form) symbols))
                    do (push form found)))
          (assert (= (length symbols) (length found)))
          (dolist (symbol symbols) (assert (find symbol found :key #'second)))
          (setf definitions (append definitions
                                    (mapcar (lambda (symbol) (find symbol found :key #'second)) symbols))))))
    definitions))

(defun lime-upgrade-live-cursor-session ()
  (unless (= 1578331 (slynk-backend:getpid)) (error "Unexpected Lime process."))
  (lime.dev:with-development-backend (backend)
    (unless (and (lime.dev::development-session-running-p lime.dev:*development-session*)
                 (not (lime.dev::development-session-paused-p lime.dev:*development-session*)))
      (error "Lime is not running normally."))
    (when (or (lime.x11::x11-backend-pointer-drag backend) (lime.x11::x11-backend-ui-session backend))
      (error "Close the menu or finish the drag before upgrading."))
    (when (and (boundp 'lime.x11::*cursor-session-settings*)
               (gethash backend lime.x11::*cursor-session-settings*))
      (error "Cursor session publisher is already installed; do not repeat this upgrade."))
    (let* ((world (lime.x11:x11-backend-world backend))
           (before (lime.persistence:snapshot-world world))
           (head (lime.x11:x11-backend-focused-head-id backend))
           (display (lime.x11::x11-backend-display backend))
           (focus (xlib:input-focus display))
           (config (lime.x11::x11-backend-configuration backend))
           (bindings (lime.x11:list-keybindings backend))
           (cursors (lime.x11::x11-backend-cursor-set backend))
           (selection (intern (format nil "_XSETTINGS_S~D"
                                      (position (lime.x11::x11-backend-x-screen backend)
                                                (xlib:display-roots display))) :keyword))
           (owner (xlib:selection-owner display selection))
           (definitions (lime-cursor-session-definitions))
           (old-functions (mapcar (lambda (form) (cons (second form) (fdefinition (second form)))) definitions)))
      (assert config)
      (assert (equal "Bibata-Original-Ice" (lime.x11:ui-cursor-style-theme (lime.x11:lime-configuration-cursor config))))
      (assert (= 24 (lime.x11:ui-cursor-style-size (lime.x11:lime-configuration-cursor config))))
      (handler-case
          (progn
            ;; New module only: no redefinition of backend/model structures.
            (load #p"/home/adan/code/common-lisp/lime/src/x11/session-settings.lisp")
            (dolist (definition definitions) (eval definition))
            (lime.x11::%apply-cursor-session-settings backend (lime.x11:lime-configuration-cursor config))
            (assert (equalp before (lime.persistence:snapshot-world world)))
            (assert (equal head (lime.x11:x11-backend-focused-head-id backend)))
            (let ((after-focus (xlib:input-focus display)))
              (assert (or (eql focus after-focus)
                          (and (typep focus 'xlib:window) (typep after-focus 'xlib:window)
                               (xlib:window-equal focus after-focus)))))
            (assert (eq config (lime.x11::x11-backend-configuration backend)))
            (assert (eq cursors (lime.x11::x11-backend-cursor-set backend)))
            (assert (equal bindings (lime.x11:list-keybindings backend)))
            (assert (lime.core:validate-world world))
            (when owner (assert (xlib:window-equal owner (xlib:selection-owner display selection))))
            (list :upgraded t :functions (length definitions) :world-unchanged t
                  :focus-unchanged t :bindings-unchanged t :configuration-unchanged t
                  :previous-settings-manager (and owner (xlib:window-id owner))
                  :cursor-session (lime.x11::%cursor-session-report backend)))
        (error (condition)
          (when (fboundp 'lime.x11::%shutdown-cursor-session-settings)
            (ignore-errors (lime.x11::%shutdown-cursor-session-settings backend)))
          (dolist (entry old-functions) (setf (fdefinition (car entry)) (cdr entry)))
          (ignore-errors (xlib:display-finish-output display))
          (error condition))))))