(in-package :lem-core)

(defvar *set-location-hook* '((push-buffer-point . 0)))
(defvar *before-init-hook* '())
(defvar *after-init-hook* '())
(defvar *splash-function* nil)

(defvar *in-the-editor* nil)

(defun setup-first-frame ()
  (let ((frame (make-frame nil)))
    (map-frame (implementation) frame)
    (setup-frame frame (primordial-buffer))))

(defclass lem-timer-manager (timer-manager) ())
(defmethod send-timer-notification ((lem-timer-manager timer-manager) continue)
  (send-event (lambda ()
                (funcall continue)
                (redraw-display))))

(let ((once nil))
  (defun setup ()
    (setup-first-frame)
    (unless once
      (setf once t)
      (init-syntax-scanner)
      (add-hook *find-file-hook* 'process-file 5000)
      (add-hook (variable-value 'before-save-hook :global) 'process-file)
      (add-hook *input-hook*
                (lambda (event)
                  (push event *this-command-keys*))))))

(defun teardown ()
  (teardown-frames))

(defun load-init-file ()
  (flet ((maybe-load (path)
           (when (probe-file path)
             (load path)
             (message "Load file: ~a" path)
             t)))
    (let ((home (user-homedir-pathname))
          (current-dir (probe-file "."))
          (*package* (find-package :lem-user)))
      (or (maybe-load (merge-pathnames "init.lisp" (lem-home)))
          (maybe-load (merge-pathnames ".lemrc" home)))
      (unless (uiop:pathname-equal current-dir (user-homedir-pathname))
        (maybe-load (merge-pathnames ".lemrc" current-dir))))))

(defun initialize-source-registry ()
  (asdf:initialize-source-registry
   `(:source-registry
     :inherit-configuration
     (:also-exclude ".qlot")
     (:tree ,(asdf:system-source-directory :lem)))))

(defun init-at-build-time ()
  "This function is called when an lem executable file is built.
If a file named $HOME/.lem/build-init.lisp exists, it is loaded.
The difference is that init.lisp loading is called when the editor is started,
while build-init.lisp is called when the binary file is created.
See scripts/build-ncurses.lisp or scripts/build-sdl2.lisp"
  (initialize-source-registry)
  (let ((file (merge-pathnames "build-init.lisp" (lem-home))))
    (when (uiop:file-exists-p file)
      (load file))))

(defun init (args)
  (run-hooks *before-init-hook*)
  (unless (command-line-arguments-without-init-file args)
    (load-init-file))
  (run-hooks *after-init-hook*)
  (apply-args args))

(defun run-editor-thread (initialize args finalize)
  (bt2:make-thread
   (lambda ()
     (when initialize (funcall initialize))
     (unwind-protect
          (let (#+lispworks (lw:*default-character-element-type* 'character))
            (with-editor-stream ()
              (with-timer-manager (make-instance 'lem-timer-manager)
                (setf *in-the-editor* t)
                (setup)
                (let ((report (toplevel-command-loop (lambda () (init args)))))
                  (when finalize (funcall finalize report))
                  (teardown)))))
       (setf *in-the-editor* nil)))
   :name "editor"))

(defun find-editor-thread ()
  (find "editor" (bt2:all-threads)
        :test #'equal
        :key #'bt2:thread-name))

;; NOTE: so that it can be processed during compilation.
(defvar *version* (get-version-string))

(defun launch (args)
  (check-type args command-line-arguments)
  ;; for sbcl, set the default file encoding to utf-8
  ;; (on windows, the default is determined by code page (e.g. :cp932))
  #+sbcl
  (setf sb-impl::*default-external-format* :utf-8)
  (cond
    ((command-line-arguments-log-filename args)
     (apply #'log:config
            :sane
            :daily (command-line-arguments-log-filename args)
            (list
             (if (command-line-arguments-debug args)
                 :debug
                 :info))))
    (t
     (log:config :sane :daily (merge-pathnames "debug.log" (lem-home)) :info)))

  (when (command-line-arguments-help args)
    (show-help)
    (return-from launch))

  (when (command-line-arguments-version args)
    (uiop:println *version*)
    (return-from launch))

  (log:info "Starting Lem")

  (cond (*in-the-editor*
         (apply-args args))
        (t
         (let ((implementation (get-default-implementation
                                :implementation (command-line-arguments-interface args))))
           (unless implementation
             (error "implementation ~A not found" implementation-keyword))
           
           (invoke-frontend
            (lambda (&optional initialize finalize)
              (run-editor-thread initialize args finalize))
            :implementation implementation)))))

(defun lem (&rest args)
  (launch (parse-args args)))

(defun main (&optional (args (uiop:command-line-arguments)))
  (apply #'lem args))

#+sbcl
(push #'(lambda (x)
          (if x
              (lem x)
              (lem))
          t)
      sb-ext:*ed-functions*)


(add-hook *after-init-hook*
          (lambda ()
            (when *editor-warnings*
              (let ((buffer (make-buffer "*EDITOR WARNINGS*")))
                (dolist (warning *editor-warnings*)
                  (insert-string (buffer-point buffer) warning)
                  (insert-character (buffer-point buffer) #\newline))
                (pop-to-buffer buffer)))))