(import-macros {: map} :lib.macro)

(local peg
 (if (pick-values 1 (pcall require :lpeg))
   (require :lpeg)
   (require :vendor.lpeglj)))
(local number (require :lib.number))
(local parser (require :parser))
(local fetcher (require :fetcher))

(fn url-formatter [path page]
  (.. "https://ipuer.ru/catalog/" path "/?p=" page))

(local product-peg
  (* ;; id
     (parser.anywhere
       (parser.tag :div
            {:data-id (peg.Cg parser.pegs.number :id) :class "*"}))
     ;; url and image
     (parser.anywhere
       (parser.tag :a {:href (peg.Cg (parser.till "\"") :url)}
            (parser.tag :img {:src (peg.Cg (parser.till "\"") :image) :alt "*"})))
     ;; title
     (parser.anywhere
       (parser.tag :div {:class "card-product_title"}
            (parser.tag :a {:href "*"}
                 (parser.tag :span {} (peg.Cg (parser.till "</span>") :title)))))
     ;; price
     (parser.anywhere
       (parser.tag :span {:class "card-price"}
                   (* (peg.Cg
                        (* parser.pegs.number
                           (parser.maybe (* " " parser.pegs.number)))
                        :price)
                      " р.")))
     (parser.anywhere
       (+ (parser.tag :a {:data-url "*" :class "*" :data-add-text "*"} "В корзину")
          (parser.tag :a {:data-url "*" :class "*"} "В корзину")))))

(fn normalize [product]
  (local year
    (number.string->number
      (: (parser.anywhere
          (* (peg.C (^ (peg.R "09") 4))
              (parser.maybe " ")
              (- "г" (peg.P "гр"))))
        :match product.title)))
  (local weight
    (number.string->number
      (: (parser.anywhere (* (peg.C parser.pegs.number) (parser.maybe " ") "гр"))
        :match product.title)))
  (local price (number.string->number product.price))

  {:site "ipuer"
   :id product.id
   :url (.. "https://ipuer.ru" product.url)
   :title product.title
   :description ""
   ;; FIXME: parse all editions into different projects
   :image (.. "https://ipuer.ru" product.image)
   :year year
   :price price
   :weight weight
   :category product.category
   :price-per (if (and price weight (< 0 weight))
                  (/ (math.ceil (* (/ price weight) 10)) 10)
                  nil)})

(fn products []
  (fetcher.from-html
    url-formatter
    [{:path "shen-puer" :category "Шен пуэр"}
     {:path "shu-puer" :category "Шу пуэр"}
     {:path "drugoy-chay"}
     {:path "blagovoniya" :category "Благовония"}
     {:path "posuda" :category "Посуда"}
     {:path "282" :category "Посуда"}]
    normalize
    product-peg))

{: products}