#lang pollen/mode racket/base

;; Copyright (c) 2019 Joel Dueck.
;;
;; Licensed under the Apache License, Version 2.0 (the "License");
;; you may not use this file except in compliance with the License.
;; A copy of the License is included with this source code, in the
;; file "LICENSE.txt".
;; You may also obtain a copy of the License at
;;
;;       http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.
;;
;; Author contact information:
;;   joel@jdueck.net
;;   https://joeldueck.com
;; -------------------------------------------------------------------------

;; Builds the paginated “blog” HTML files (blog-pg1.html ...) from the SQLite cache
;; The files will be written out every time this module is evaluated! (see end)

(require "crystalize.rkt"
         "snippets-html.rkt"
         racket/file
         sugar/list)

(provide main)

;; How many items per blog page
(define per-page 5)

;; Returns a string containing the entire HTML contents of a given blog page
(define (blog-page posts-str pagenum total-pages)
  (define page-nav (html$-paginate-navlinks pagenum total-pages "blog"))
  ◊string-append{
 <!DOCTYPE html>
 <html lang="en">
 ◊html$-page-head[(format "The Local Yarn: Blog, p. ~a" pagenum)]
 ◊html$-page-body-open[]

 <aside><i>Everything, in reverse time order. Well, almost everything.</i></aside>

 <nav id="top-nav"><ul>◊|page-nav|</ul></nav>

 ◊posts-str

 <nav id="bottom-nav"><ul>◊|page-nav|</ul></nav>

 ◊html$-page-body-close[]
 </html>})

;; Grabs all the articles+notes from the cache and writes out all the blog page files
(define (build-blog)
  (spell-of-summoning!) ; Turn on the DB
  
  (define articles+notes (slice-at (list/articles+notes 'listing_full_html #:series #f) per-page))
  (define pagecount (length articles+notes))
  
  (for ([pagenum (in-range 1 (+ 1 pagecount))]
        [page    (in-list articles+notes)])
    (define filename (format "blog-pg~a.html" pagenum))
    (displayln (format "Writing: ~a" filename))
    (display-to-file (blog-page (apply string-append page) pagenum pagecount)
                     filename
                     #:mode 'text
                     #:exists 'replace)))

(define (main)
  ;; Do it!
  (build-blog))
