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

(tset package :path (.. package.path ";./vendor/lpeglj/?.lua"))

(local io (require :io))
(local math (require :math))
(local fennel (require :vendor.fennel))
(local html (require :vendor.html))
(local json (require :vendor.json))
(local array (require :lib.array))
(local str (require :lib.string))

(local ozchai (require :parser.ozchai))
(local ipuer (require :parser.ipuer))
(local artoftea (require :parser.artoftea))

(when _G.unpack
 (tset table :unpack _G.unpack))

(local db (luna.db.open "file:var/db.sqlite?_journal=WAL&_sync=NORMAL"))

(local query-synonyms {
  "шэн" "шен"
  "шен" "шэн"
  "доска" "чабань"
  "чабань" "доска"
  "термос" "бутылка"
  "бутылка" "термос"})

(fn unescape [s]
  (assert (= (type s) :string) "s must be string")
  (pick-values 1
   (-> s
    (string.gsub "&lt;" "<")
    (string.gsub "&gt;" ">")
    (string.gsub "&quot;" "\"")
    (string.gsub "&amp;" "&"))))

(fn random-products [limit]
  (assert (< 0 limit) "limit must be > 0")
  (luna.db.query*
    db
    "SELECT site,
            title,
            description,
            image,
            url,
            price,
            weight,
            price_per AS \"price-per\",
            year
      FROM products
      ORDER BY RANDOM()
      LIMIT ?"
    [limit]))

(fn all-tags []
  (map
    (fn [_ v] (. v 1))
    (luna.db.query
      db
      "SELECT title FROM tags ORDER BY creation_time"
      [])))

(fn query-products [page query tags]
  (local tags (or tags []))

  (var where-conds [])
  (var where-vars [])
  (when (< 0 (# tags))
    (each [_ tag (pairs tags)]
      (table.insert where-conds "product_tags.tag = ?")
      (table.insert where-vars tag)))
  (when (and query (< 0 (# query)))
    (table.insert where-conds "search.title MATCH ?")
    (table.insert where-vars
      (array.join
        (map (fn [_ q]
               (if (. query-synonyms q)
                 (.. "(" q "* OR " (. query-synonyms q) "*)")
                 (.. q "*")))
             (str.split query))
        " AND ")))
  (local where-sql (array.join where-conds "\nAND "))

  (local total
   (luna.db.query
    db
    (string.format
      "SELECT count(*)
       FROM search
       LEFT JOIN product_tags ON product_tags.product = search.fid
       WHERE search.`table` = 'products'
       AND %s" where-sql)
    where-vars))

  {:results
    (luna.db.query*
        db
        (string.format
          "SELECT highlight(search, 0, '<i>', '</i>') AS \"title\",
                  products.site,
                  products.description,
                  products.image,
                  products.url,
                  products.price,
                  products.weight,
                  products.price_per AS \"price-per\",
                  products.year,
                  products.archived,
                  products.creation_time AS \"creation-time\"
          FROM search
          INNER JOIN products ON search.fid = products.url
          LEFT JOIN product_tags ON product_tags.product = products.url
          WHERE search.`table` = 'products'
          AND %s
          ORDER BY rank
          LIMIT 48 OFFSET ?" where-sql)
        (array.concat where-vars [(* (- page 1) 48)]))
   :total (if (< 0 (# total))
           (. total 1 1)
           0)})

(fn site-name-template [name]
  (if
   (= name "ipuer")
    [:a {:class "site-icon" :href "https://ipuer.ru"
         :alt "Логотип Институт чай пуэр"}
     [:img {:src "/static/ipuer.jpg"}]
     "Институт чая пуэр"]
   (= name "artoftea")
    [:a {:class "site-icon" :href "https://artoftea.ru"
         :alt "Логотип Art of tea"}
     [:img {:src "/static/artoftea.png"}]
     "Art of tea"]
   (= name "ozchai")
    [:a {:class "site-icon" :href "https://ozchai.ru"
         :alt "Логотип #OZCHAI"}
     [:img {:src "/static/ozchai.ico"}]
     "Чайная #OZCHAI"]
   (= name "clubcha")
    [:a {:class "site-icon" :href "https://clubcha.ru"
         :alt "Логотип Железный Феникс"}
     [:img {:src "/static/clubcha.png"}]
     "Железный Феникс"]
   (= name "chaekshop")
    [:a {:class "site-icon" :href "https://chaekshop.ru"
         :alt "Логотип Интернет-магазин фермерского китайского чая «Чаёк»"}
     [:img {:src "/static/chaekshop.svg"}]
     "Интернет-магазин «Чаёк»"]
   ""))

(fn item-template [product]
  [:div {:class "tile"}
   [:a {:href product.url :style "display: block;" :rel "nofollow"}
    [:img {:src product.image :title product.title :alt product.title} ""]]
   (site-name-template product.site)
   [:a {:href product.url :style "text-decoration: none;" :rel "nofollow"}
    [:NO-ESCAPE (.. "<h2>" (unescape product.title) "</h2>")]]
   [:div {:class "price"}
    (if product.price (.. product.price "₽") "")
    (if (< 0 product.weight)
      [:NO-ESCAPE (.. "за&nbsp;" product.weight "&nbsp;гр.")]
      "")
    (if (and (< 1 product.weight)
             product.price-per
             (< 0 product.price-per))
     [:NO-ESCAPE (.. " (" product.price-per "₽ за&nbsp;1&nbsp;гр.)")]
     "")]
   ;; FIXME: security issue
   [:small {} [:NO-ESCAPE (unescape (str.truncate product.description 200))]]])

(fn paginator-template [query tags page limit total]
  (local last-page (math.ceil (/ total limit)))
  (fn make-url [page query tags]
    (.. "?page=" (tostring page)
         "&query=" query
         "&"
         (array.join
          (array.flatten
           (map (fn [_ tag] (.. "tags=" tag))
                tags))
          "&")))

  (if (< limit total)
    [:div {:class "paginator"}
     [:div {:class "paginator-numbers"}
      (if (< 1 page)
       [:a {:href (make-url (- page 1) query tags)} "←"]
       "")
      (faccumulate [res [:span {}] i 1 last-page]
       (do
         (table.insert
           res [:a {:href (make-url i query tags)
                    :class (if (= page i) "paginator-active" "")}
                (tostring i)])
         res))
      (if (< page last-page)
       [:a {:href (make-url (+ page 1) query tags)} "→"]
       "")]
     [:div {} "Всего результатов: " [:strong {} (string.format "%d" total)]]]
    ""))

(fn aside-template [query tags paginator]
  [:aside {:class "aside"}
   [:div {:class "aside-content"}
    (if (or (~= query "") (< 0 (# tags)))
      [:a {:href "/" :style "display: block;"}
       [:img {:class "logo" :src "static/logo.svg"
              :alt "Логотип meicha.ru" :title "Логотип meicha.ru"}]]
       [:img {:class "logo" :src "static/logo.svg"
              :alt "Логотип meicha.ru" :title "Логотип meicha.ru"}])
    [:form {:class "form"}
     [:input {:type :search :name :query :value query
              :autofocus true :placeholder "Поисковый запрос"}]
     [:div {:class "form-tags"}
      [:select {:class "form-tag" :name "tags"}
        [:option {:value ""} "~ Категория ~"]
        (table.unpack
          (map
            (fn [_ tag]
                [:option {:value tag
                          :selected (if (array.contains tags tag) "selected" nil)}
                tag])
            (all-tags)))]]
     [:button {:type :submit} "Искать"]]
    paginator]])

(fn base-template [query tags page total ...]
  (local paginator (paginator-template query tags page 48 total))
  [:html {:lang "en"}
   [:head {}
    [:meta {:charset "UTF-8"}]
    [:link {:rel :stylesheet :href "static/style.css"}]
    [:title {} "A new cool web server for lua"]]
   [:body {}
    [:div {:class "container"}
     [:div {:class "content"}
      (aside-template query tags paginator)
      [:section {}
       [:div {:class "list"} ...]
       [:footer {} paginator]]]]]])

(fn get-query-string [query key]
  (if (and query
           (. query key)
           (. query key 1)
           (< 0 (# (. query key 1))))
    (. query key 1)
    nil))

(fn get-query-number [query key]
  (if (and query
           (. query key)
           (. query key 1))
    (tonumber (. query key 1))
    nil))

(fn root-handler [{: path : query}]
  (if (= path "/")
    (let [headers {:content-type "text/html"}
          page (or (get-query-number query "page") 1)
          search (str.trim (or (get-query-string query "query") ""))
          tags (filter #(~= "" $2) (or query.tags []))
          {: results : total}
            (if (or (~= "" search) (< 0 (# tags)))
              (query-products page search tags)
              {:total 48 :results (random-products 48)})]
      (values
        200 headers
        (html.render
          (base-template
            search tags page total
            (table.unpack (map #(item-template $2) results)))
          true)))
    (values 404 {} "not found")))

(luna.router.route "GET /" root-handler)
(luna.router.static "GET /static/" "static/")