(ns yenu.routes.admin
  (:require [yenu.layout :as layout]
            [compojure.core :refer [defroutes GET POST]]
            [ring.util.http-response :as response]
            [ring.util.response :refer [redirect]]
            [clojure.java.io :as io]
            [yenu.helpers.images :as images]
            [yenu.db.core :as db]
            [clojure.string :as str])
  (:import [java.io File FileInputStream FileOutputStream]))

(defn decoded-url-file [filepath]
  (java.net.URLDecoder/decode filepath "utf-8"))

(defn upload-file [{:keys [tempfile size filename]}]
  (let [target-filepath (decoded-url-file (images/data-path "to-process" filename))]
    (try
      (with-open [in (new FileInputStream tempfile)
                  out (new FileOutputStream target-filepath)]
        (let [src (.getChannel in)
              dst (.getChannel out)]
          (.transferFrom dst src 0 (.size src))
          (.flush out))))
    target-filepath))

(defn add-tag [image-id tag]
  (db/create-tag! {:tagname tag})
  
  (let [{tag-id :id} (db/get-tag {:tagname tag})]
    (db/add-tag-to-image! {:imageid image-id :tagid tag-id})))

(defn add-image-to-database [filehash title description tags]
  (let [img (db/create-image! {:hash filehash :title title :description description})
        image-id ((keyword "last_insert_rowid()") img)
        all-tags (str/split tags, #"(\s*,\s*|\s+)")]
    (run! #(add-tag image-id %) all-tags))) 

(defroutes admin-routes
  (GET "/upload" []
       (layout/render "admin/upload.html"))
  (POST "/upload" [file title description tags]
        (-> (upload-file file)
            (images/process-image)
            (add-image-to-database title description tags))
        (redirect "/"))

  (GET "/statistics" []
       (layout/render "statistics.html"))
  (GET "/comments" []
       (layout/render "comments.html")))