(in-package :fwoar.rss-reader)

(defgeneric app (obj)
  (:documentation "the ningle app that is to be run"))

(defgeneric handler (obj)
  (:documentation "the clack handler representing the currently running application"))

(defclass+ rss-reader ()
  ((%feeds :initarg :feeds :accessor feeds)
   (%app :initform (make-instance 'ningle:<app>)
         :reader app)
   (%handler :accessor handler))
  (:documentation
   "A simple wrapper that ties a ningle app to a clack handler"))

(defgeneric add-feed (feed reader)
  (:method :around (_ reader)
    (call-next-method)
    reader)
  (:method ((feed feed-reference) (reader rss-reader))
    (push feed
          (feeds reader))))

(defun redirect (target)
  (lambda (_)
    (declare (ignore _))
    `(302 (:location ,target) ())))

(defmethod araneus:routes progn ((app rss-reader))
  (araneus:defroutes (app app)
    (("/") (redirect (format nil "/f/~(~a~)"
                             (feed-key
                              (car
                               (feeds app))))))
    (("/f/:feed") (lambda (params)
                    (optima:match params
                      ((optima.extra:alist (:feed . feed))
                       (araneus:run-route (feed-page (feeds app)
                                                     (find feed (feeds app)
                                                           :key 'feed-key
                                                           :test 'string-equal))
                                          params)))))
    (("/f/:feed/:item") (lambda (params)
                          (optima:match params
                            ((optima.extra:alist (:feed . feed) (:item . item))
                             (araneus:run-route (feed-item-page (feeds app)
                                                                (find feed (feeds app)
                                                                      :key 'feed-key
                                                                      :test 'string-equal)
                                                                item)
                                                params)))))))

(defun start (app)
  (prog1 app
    (setf (handler app)
          (clack:clackup (app app)))))

(defvar *app*)

(defun unboundp (symbol)
  (not (boundp symbol)))

(defun main ()
  (setf *app*
        (if (not (boundp '*app*))
            (start
             (araneus:routes
              (rss-reader (list
                           (feed-reference :techcrunch      "https://techcrunch.com/feed/")
                           (plump-cleaner  :coding-horror   "http://feeds.feedburner.com/codinghorror")
                           (feed-reference :daring-fireball "https://daringfireball.net/feeds/main")))))
            (araneus:routes *app*))))