;;;; -*- coding: utf-8; mode: lisp -*-
;;;; Copyright 2007, Matthias Andreas Benkard.

;;;------------------------------------------------------------------------
;;; This file is part of The Mulkblog Project.
;;;
;;; The Mulkblog Project is free software.  You can redistribute it and/or
;;; modify it under the terms of the Affero General Public License as
;;; published by Affero, Inc.; either version 1 of the License, or
;;; (at your option) any later version.
;;;
;;; The Mulkblog Project is distributed in the hope that it will be
;;; useful, but WITHOUT ANY WARRANTY; without even the implied warranty
;;; of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the Affero General Public
;;; License in the COPYING file that comes with The Mulkblog Project; if
;;; not, write to Affero, Inc., 510 Third Street, Suite 225, San
;;; Francisco, CA 94107 USA.
;;;------------------------------------------------------------------------

(in-package #:mulk.journal)


(defun link-to (action &key post-id (absolute nil))
  (with-output-to-string (out)
    (format out "~A" (if absolute
                         "http://matthias.benkard.de/journal"
                         ;; When testing on the local webserver, don't
                         ;; use /journal as a relative URI, because it
                         ;; won't work.
                         (if (eq *site* :mst-plus)
                             (gethash "SCRIPT_NAME" *http-env* "")
                             "/journal")))
    (multiple-value-call
        #'(lambda (&rest args) (apply #'format out args))
      (case action
        (:index "")
        (:view-atom-feed (values "/feed"))
        (:view (if post-id
                   (values "/~D" post-id)
                   "/"))
        ((:edit :preview) (values "/~D/preview" post-id))
        (:post-comment (values "/~D" post-id))
        (:save (values "/~D/save" post-id))
        (:css (if (eq *site* :mst-plus)
                  "/../../journal.css"
                  "/../journal.css"))))))


(defun show-atom-feed ()
  #.(locally-enable-sql-reader-syntax)
  (http-add-header "Last-Modified" (http-timestamp (compute-journal-last-modified-date)))
  (http-add-header "Content-Language" "de")
  (http-send-headers "application/atom+xml; charset=UTF-8")

  (flet ((atom-time (time)
           (format-date nil
                        "%4yr-%2mon-%2dayT%2hr:%2min:%2secZ"
                        time
                        0)))
    (with-xml-output (*standard-output* :encoding "utf-8")
      (with-tag ("feed" '(("xmlns" "http://www.w3.org/2005/Atom")))
        (emit-simple-tags :title "Kompottkins Weisheiten"
                          :updated (atom-time
                                    (max (or (single-object
                                               (select [max [slot-value 'journal-entry 'date]]
                                                       :from [journal-entry]
                                                       :flatp t))
                                             0)
                                         (or (single-object
                                               (select [max [slot-value 'journal-entry 'last-modification]]
                                                       :from [journal-entry]
                                                       :flatp t))
                                             0)))
                          :id "urn:uuid:88ad4730-90bc-4cc1-9e1f-d4cdb9ce177c")
        (with-tag ("subtitle")
          (xml-as-is "Geschwafel eines libertärsozialistischen Geeks"))
        (with-tag ("author")
          (emit-simple-tags :name "Matthias Benkard"))
        (with-tag ("link" `(("rel" "alternate")
                            ("type" "text/html")
                            ("href" ,(link-to :index :absolute t)))))
        (with-tag ("link" `(("rel" "self")
                            ("type" "application/atom+xml")
                            ("href" ,(link-to :view-atom-feed :absolute t)))))

        (let ((number 0))
          (dolist (journal-entry (select 'journal-entry
                                         :order-by '(([date] :desc))
                                         :flatp t))
            (incf number)
            (with-slots (title date body categories last-modification id)
                        journal-entry
               (with-tag ("entry")
                 (emit-simple-tags :title title
                                   :id (format nil "urn:uuid:~(~A~)"
                                               (uuid-of journal-entry))
                                   :updated (atom-time (or last-modification date))
                                   :published (atom-time date))
                 (with-tag ("link" `(("rel" "alternate")
                                     ("type" "text/html")
                                     ("href" ,(link-to :view
                                                       :post-id id
                                                       :absolute t)))))
                 (when (or (and last-modification
                                (> last-modification (- (get-universal-time)
                                                        (* 30 24 60 60))))
                           (<= number 8))
                   ;; We only include the body for the most recent
                   ;; posts in order to save bandwidth.
                   (with-tag ("content" `(("type" "xhtml")
                                          ("xml:lang" "de")
                                          ("xml:base" ,(link-to :index :absolute t))))
                     (with-tag ("div" '(("xmlns" "http://www.w3.org/1999/xhtml")))
                       (xml-as-is (journal-markup->html (body-of journal-entry)))))))))))))
  #.(restore-sql-reader-syntax-state))


(let ((scanner (ppcre:create-scanner "(\\n|\\r|\\r\\n)(\\n|\\r|\\r\\n)+")))
  (defun render-comment-body (text)
    (loop for last-position = 0 then (cadr matches)
          for matches = (ppcre:all-matches scanner
                                           text)
          then (cddr matches)
          while (not (endp matches))
          do (<:p (<:as-html (subseq text last-position (car matches))))
          finally
            (<:p (<:as-html (subseq text last-position))))))


(defun show-journal-entry (journal-entry &key (comments-p nil))
  (with-slots (id title body categories date) journal-entry
     (show-journal-entry-with-components id title body categories date
                                         (comments-about journal-entry
                                                         :ordered-p t
                                                         :ham-p t)
                                         comments-p)))


(defun show-journal-entry-with-components (id title body categories
                                           posting-date comments comments-p)
  (<:div :class :journal-entry
   (<:h2 (<:a :href (link-to :view :post-id id)
              (<:as-html title)))
    (<:div :class :journal-entry-header
     (<:span :class :journal-entry-date
      (<:as-html
       (format-date nil "%@day-of-week, den %day.%mon.%yr, %hr:%2min."
                    posting-date)))
     (unless (null categories)
       (<:span :class :journal-entry-category
        (<:as-html
         (format nil "Abgeheftet unter ...")))))
    (when *full-entry-view*
      (<:div :class :journal-entry-body
       (<:as-is (journal-markup->html body))))
    (<:div :class :journal-entry-footer
     (when *full-entry-view*
       (<:form :class :journal-entry-delete-button-form
               :style "display: inline;"
               :method "post"
               :action (link-to :index)
        (<:div :style "display: inline;"
         (<:input :type "hidden"
                  :name "action"
                  :value "delete")
         (<:input :type "hidden"
                  :name "id"
                  :value (prin1-to-string id))
         (<:button :type "submit"
                   (<:as-is "L&ouml;schen"))))
       " | "
       (<:form :class :journal-entry-edit-button-form
               :style "display: inline;"
               :method "get"
               :action (link-to :edit :post-id id)
        (<:div :style "display: inline;"
         (<:input :type "hidden"
                  :name "id"
                  :value (prin1-to-string id))
         (<:button :type "submit"
                   (<:as-is "Bearbeiten"))))
       " | ")
     (<:a :href (link-to :view :post-id id)
          (<:as-is
           (format nil "~D Kommentar~:*~[e~;~:;e~]" (length comments))))))

  (when (and *full-entry-view* comments-p (not (null comments)))
    (<:div :class :journal-comments
     (<:h2 "Kommentare")
     (dolist (comment comments)
       (with-slots (author body date id email website)
           comment
         (<:div :class :journal-comment
          (<:div :class :journal-comment-header
           (<:as-html (format nil "(~A) "
                              (format-date nil "%day.%mon.%yr, %hr:%min" date)))
           (<:a :href website :rel "nofollow"
            (<:as-html (format nil "~A" author)))
           (<:as-html " meint: "))
          (<:div :class :journal-comment-body
           (<:as-html (render-comment-body body))))))))

  (when (and *full-entry-view* comments-p)
    (<:div :class :journal-new-comment
     (<:h2 "Neuen Kommentar schreiben")
     (<:p (<:as-is "Bitte beachten Sie, da&szlig; E-Mail-Adressen niemals
                    ver&ouml;ffentlicht werden und nur von Matthias eingesehen
                    werden k&ouml;nnen."))
     (<:p (<:strong "Hinweise: ")
          "Diese Website verwendet "
          (<:a :href "http://akismet.com/" "Akismet")
          " zur Spamerkennung. "
          (<:as-is "E-Mail-Adressen werden auch gegen&uuml;ber Akismet
                    unter Verschlu&szlig; gehalten.  Nur unformatierter
                    Text ist erlaubt.  Leerzeilen trennen
                    Abs&auml;tze."))
     (<:form :action (link-to :view :post-id id)
             :method "post"
             :accept-charset #+(or) "ISO-10646-UTF-1"
                             "UTF-8"
             :enctype #+(or) "multipart/form-data"
                      "application/x-www-form-urlencoded"
      (<:div :style "display: none"
       (<:input :type "hidden"
                :name "id"
                :value (prin1-to-string id))
       (<:input :type "hidden"
                :name "action"
                :value "post-comment"))
      (<:div :style "display: table"
       (loop for (name . desc) in '(("author" . "Name (n&ouml;tig)")
                                    ("email" . "E-Mail")
                                    ("website" . "Website"))
             do (<:div :style "display: table-row"
                 (<:div :style "display: table-cell; vertical-align: top"
                  (<:label :for name
                           :style "vertical-align: top"
                   (<:as-is (format nil "~A: " desc))))
                 (<:div :style "display: table-cell;"
                  (<:input :type "text"
                           :name name
                           :id name))))
       (<:div :style "display: table-row"
        (<:div :style "display: table-cell; vertical-align: top"
         (<:label :for "comment-body"
                  :style "vertical-align: top"
          (<:as-html "Kommentar: ")))
        (<:div :style "display: table-cell"
         (<:textarea :name "comment-body"
                     :id "comment-body"
                     :rows 10
                     :cols 40))))
      (<:div
       (<:button :type "submit"
        (<:as-is "Ver&ouml;ffentlichen")))))))


(defun call-with-web-journal (page-title thunk)
  ;; TODO: Check how to make Squid not wait for the CGI script's
  ;;       termination, which makes generating a Last-Modified header
  ;;       feel slower to the end user rather than faster.
  ;;
  ;; (http-add-header "Last-Modified" (http-timestamp (compute-journal-last-modified-date)))
  (http-add-header "Content-Language" "de")
  (http-send-headers "text/html; charset=UTF-8")

  (<xhtml :xmlns "http://www.w3.org/1999/xhtml"
          :lang "de"
   (<:head
    (<:title
     (<:as-html
      (if page-title
          (format nil "~A -- Kompottkins Weisheiten" page-title)
          "Kompottkins Weisheiten")))
    (<:link :rel "alternate"
            :type "application/atom+xml"
            :href (link-to :view-atom-feed)
            :title "Kompottkins weiser Atom-Feed")
    (<:link :rel "stylesheet" :type "text/css" :href (link-to :css))
    (<:link :rel "openid.server" :href "https://meinguter.name/index.php/serve")
    (<:link :rel "openid.delegate" :href "https://matthias.benkard.meinguter.name"))
   (<:body
    (<:div :id :main-title-box
     (<:h1 :id :main-title
           (<:a :href (link-to :index)
                "Kompottkins Weisheiten"))
     (<:div :id :main-subtitle
      (<:as-is "&bull;&bull;&bull; ")
      (<:as-is
       (random-elt
        '("Geschwafel eines libert&auml;rsozialistischen Geeks"
          "NEU!  Jetzt ohne regelm&auml;&szlig;ige Serverabst&uuml;rze!"
          "NEU!  Jetzt mit mehr als 3 % Uptime!")))
      (<:as-is " &bull;&bull;&bull;")))
    (when *journal-warnings*
      (<:div :id :warnings
       (dolist (warning *journal-warnings*)
         (<:div :class :journal-warning
          (<:p (<:strong "Achtung!"))
          (<:as-is warning)))))
    (<:div :id :contents
     (funcall thunk))
    (<:div :id :navigation))


    (when *debugging-p*
      (loop for (x . y) in `(("Action" . ,*action*)
                             ("Entry ID" . ,*post-number*)
                             ("Request method" . ,*method*)
                             ("Query" . ,*query*)
                             ("Query string" . ,(http-get-query-string))
                             ("Subpath" . ,*subpath*)
                             ("Environment" . ,(http-get-env-vars))
                             #+clisp ("Environment #2" . ,(ext:getenv)))
         do (<:p
             (<:hr)
             (<:h2 (<:as-html x))
             (<:p "Type " (<:em (<:as-html (type-of y))) ".")
             (<:pre (<:as-html (prin1-to-string y))))))))


(defun show-web-journal ()
  #.(locally-enable-sql-reader-syntax)
  (with-web-journal ((if (member *action* '(:view :edit :preview :post-comment
                                            :save-entry))
                         (title-of (find-entry *post-number*))
                         nil))
    (case *action*
      ((:index nil)
       (let ((number 0))
         (dolist (entry (select 'journal-entry
                                :order-by '(([date] :desc))
                                :flatp t))
           (incf number)
           (let ((*full-entry-view* (< number 5)))
             (show-journal-entry entry)))))
      ((:view :post-comment :save-entry)
       (show-journal-entry (find-entry *post-number*) :comments-p t))))
  #.(restore-sql-reader-syntax-state))


(defun preview-entry (title body id)
  (with-web-journal (title)
    (<:form :action (link-to :save :post-id id)
            :method "post"
            :accept-charset "UTF-8"
            :enctype "application/x-www-form-urlencoded"
      (when id
        (<:input :type "hidden"
                 :name "id"
                 :value (prin1-to-string id)))
      (<:input :type "hidden"
               :name "title"
               :value title)
      (<:input :type "hidden"
               :name "body"
               :value body)
      (<:div
       (<:button :type "submit"
        (<:as-is "Ver&ouml;ffentlichen"))))
    (show-journal-entry-with-components (or id -1)
                                        title
                                        body
                                        nil
                                        (get-universal-time)
                                        nil
                                        nil)
    ;; Editor here.
    (<:form :action (link-to :preview :post-id id)
            :method "post"
            :accept-charset "UTF-8"
            :enctype "application/x-www-form-urlencoded"
      (<:div :style "display: none"
       (when id
         (<:input :type "hidden"
                  :name "id"
                  :value (prin1-to-string id))))
      (<:div :style "display: table"
       (<:div :style "display: table-row"
        (<:div :style "display: table-cell; vertical-align: top"
         (<:label :for "entry-title-editor"
                  :style "vertical-align: top"
          (<:as-is "&Uuml;berschrift: ")))
        (<:div :style "display: table-cell;"
         (<:input :type "text"
                  :name "title"
                  :value title
                  :id "entry-title-editor")))
       (<:div :style "display: table-row"
        (<:div :style "display: table-cell; vertical-align: top"
         (<:label :for "entry-body-editor"
                  :style "vertical-align: top"
          (<:as-html "Kommentar: ")))
        (<:div :style "display: table-cell"
         (<:textarea :name "body"
                     :id "entry-body-editor"
                     :rows 20
                     :cols 65
           (<:as-html body)))))
      (<:div
       (<:button :type "submit"
        (<:as-is "Vorschau"))))))


(defun show-debugging-page ()
  (http-add-header "Content-Language" "de")
  (http-send-headers "text/html; charset=UTF-8")

  (<xhtml :xmlns "http://www.w3.org/1999/xhtml"
          :lang "de"
    (when *debugging-p*
      (loop for (x . y) in `(("Action" . ,*action*)
                             ("Entry ID" . ,*post-number*)
                             ("Request method" . ,*method*)
                             ("Query" . ,*query*)
                             ("Query string" . ,(http-get-query-string))
                             ("Subpath" . ,*subpath*)
                             ("Environment" . ,(http-get-env-vars))
                             #+clisp ("Environment #2" . ,(ext:getenv)))
            do (<:p
                 (<:hr)
                 (<:h2 (<:as-html x))
                 (<:p "Type " (<:em (<:as-html (type-of y))) ".")
                 (<:pre (<:as-html (prin1-to-string y))))))))