(define-module (ldp resource sxml)
  #:use-module (ldp resource)
  #:use-module (ldp path)
  #:use-module (sxml match))

(define-public (sxml->resource res)
  (sxml-match
   res
   ((*TOP* (*PI* . ,whatever) . ,rest)
    (sxml->resource `(*TOP* ,@rest)))
   ((*TOP* ,rest)
    (sxml->resource rest))
   ((https://linked-data-platform.planete-kraus.eu/ns:resource
     (@ (container "no")
	(uri-path ,uri-path)
	(etag ,etag)
	(content-type ,content-type)))
    (make-resource (string->path uri-path)
		   etag
		   (string->symbol content-type)
		   #f))
   ((https://linked-data-platform.planete-kraus.eu/ns:resource
     (@ (container "yes")
	(uri-path ,uri-path)
	(etag ,etag)
	(content-type ,content-type))
     (https://linked-data-platform.planete-kraus.eu/ns:contains
      (@ (path ,contents)))
     ...)
    (make-resource (string->path uri-path)
		   etag
		   (string->symbol content-type)
		   (map string->path contents)))
   (,otherwise
    (scm-error 'wrong-type-arg
	       "sxml->resource"
	       "Expected a SXML fragment with the correct schema, not ~s."
	       (list res)
	       (list res)))))

(define-public (resource->sxml x)
  `(*TOP* (*PI* xml "version=\"1.0\" encoding=\"utf-8\"")
	  (resource
	   (@ (xmlns "https://linked-data-platform.planete-kraus.eu/ns")
	      (container ,(if (container? x) "yes" "no"))
	      (uri-path ,(path->string (resource-path x)))
	      (etag ,(resource-etag x))
	      (content-type ,(symbol->string (resource-content-type x))))
	   ,@(map (lambda (p)
		    `(contains (@ (path ,(path->string p)))))
		  (or (resource-contained x) '())))))