;;; Copyright © 2019 - 2023 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program 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 GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (jakob dynamic capabilities gallery)
  #:use-module (haunt html)
  #:use-module (ice-9 match)
  #:use-module (jakob dynamic config)
  #:use-module (jakob dynamic errors)
  #:use-module (jakob dynamic util)
  #:use-module (jakob theme)
  #:use-module (squee)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (web request)
  #:use-module (web response)
  #:use-module (web uri)
  #:export (get-gallery get-image))

(define conn (connect-to-postgres-paramstring (paramstring-for-dbname "jakob_gallery")))

;; How many bytes of entropy to use when generating vanity ID's.
(define %vanity-length (make-parameter 9))

;; Path where gallery images are stored.
(define %gallery-image-directory (make-parameter "/home/jakob/gallery-images/"))

(define (valid-gallery-code code)
  "Check database to see if `code' names a nonempty gallery."
  (and (= (string-length code) (base64-length (%vanity-length)))
       (positive?
        (length
         (exec-query conn "SELECT * FROM images WHERE vanity = $1"
                     (list code))))))

(define (render-gallery code)
  (define info
    (first
     (exec-query conn "SELECT title, description, datetime FROM galleries WHERE vanity = $1" (list code))))
  (define images
    (exec-query conn "SELECT title, filename, thumb_filename, datetime FROM images WHERE vanity = $1" (list code)))
  (match info
    ((title description datetime)
     `(div (@ (id "gallery-container"))
           (h1 ,title)
           (h3 ,description)
           ,(map (lambda (image)
                   (match image
                     ((title filename thumbnail datetime)
                      `(a (@ (href ,(format #f "/static-ext/~a" filename)))
                          (img (@ (src ,(format #f "/static-ext/~a" thumbnail))
                                  (alt ,title)
                                  (title ,(format #f "~a - ~a" title datetime))))))))
                 images)))))

(define (get-gallery request body)
  (let* ((query-string (uri-query (request-uri request)))
         (params (if query-string
                     (decode-form query-string)
                     '()))
         (code (if (assoc-ref params "g")
                   (car (assoc-ref params "g"))
                   (panic "no gallery code provided"))))
    (unless (valid-gallery-code code) (panic "invalid gallery code"))
    (values '((content-type . (text/html)))
              (sxml->html-string
               (theme #:title "Photo Gallery" #:content (render-gallery code))))))