(uiop:define-package #:hsx/hsx
  (:use #:cl)
  (:import-from #:alexandria
                #:symbolicate)
  (:import-from #:hsx/element
                #:create-element)
  (:export #:defhsx
           #:defcomp
           #:hsx))
(in-package #:hsx/hsx)


;;;; hsx definitions

(defmacro defhsx (name element-type)
  `(defmacro ,name (&body body)
     (multiple-value-bind (props children)
         (parse-body body)
       `(create-element ,',element-type (list ,@props) ,@children))))

(defun parse-body (body)
  (if (keywordp (first body))
      (loop :for thing :on body :by #'cddr
            :for (k v) := thing
            :when (and (keywordp k) v)
            :append (list k v) :into props
            :when (not (keywordp k))
            :return (values props thing)
            :finally (return (values props nil)))
      (values nil body)))

(defmacro defcomp (name props &body body)
  (let ((%name (symbolicate '% name)))
    `(eval-when (:compile-toplevel :load-toplevel :execute)
       (defun ,%name ,props
         ,@body)
       (defhsx ,name (fdefinition ',%name)))))


;;;; hsx macro to find hsx symbols

(defmacro hsx (form)
  (find-builtin-symbols form))

(defun find-builtin-symbols (tree)
  (if tree
      (cons (let ((first-node (first tree)))
              (if (listp first-node)
                  (find-builtin-symbols first-node)
                  (or (find-symbol (string first-node) :hsx/builtin)
                      first-node)))
            (mapcar (lambda (node)
                      (if (listp node)
                          (find-builtin-symbols node)
                          node))
                    (rest tree)))))