(ns utils
  (:import java.text.SimpleDateFormat
           java.net.URL
           java.util.Date
           java.util.TimeZone
           java.io.File
           java.net.URLDecoder
           javax.sql.DataSource
	   org.postgresql.ds.PGPoolingDataSource
           org.apache.commons.codec.digest.DigestUtils
           org.antlr.stringtemplate.StringTemplateGroup)
  (:use clojure.contrib.json.write
        clojure.contrib.sql
        clojure.contrib.duck-streams
        clojure.contrib.str-utils
        compojure
        config))

(let [db-host "localhost"
      db-name "dumpfm"
      db-user "postgres"
      db-pass "root"]
  ; TODO: use c3p0 for pooling?
  (def *db* {:datasource (doto (new PGPoolingDataSource)
                           (.setServerName   db-host)
                           (.setDatabaseName db-name)
                           (.setUser         db-user)
                           (.setPassword     db-pass)
                           (.setMaxConnections 20))}))

;;  moved this to here which doesn't seem right... maybe a 'settings.clj' or something?
(def *dumps-per-page* 20)
(def *vip-dumps-per-page* 200)

;; Misc

(defn download-http-url [u]
  (let [url (URL. u)]
    (if (= (.getProtocol url) "http")
      (slurp* url)
      (throw (Exception. (str "Invalid url " u))))))

(defn append [& vecs]
  (reduce into vecs))

(declare stringify-and-escape)
(defn escape-html-deep [o]
  (if (map? o)
      (stringify-and-escape o)
      (if (seq? o)
          (map escape-html-deep o)
          (escape-html o))))

(defn stringify-and-escape [m]
  (zipmap (map str* (keys m)) (map escape-html-deep (vals m))))

(defn nor [& args]
  (not-any? identity args))

(defn ms-in-future [ms]
  (+ ms (System/currentTimeMillis)))

(defn swap [f]
  (fn [& more] (apply f (reverse more))))

(defn join [lst int]
  (apply str (interpose int lst)))

(defn non-empty-string? [s]
  (cond (string? s) (> (count s) 0)
        :else s))

(defn seconds [t] (* t 1000))
(defn minutes [t] (* 60 (seconds t)))
(defn hours   [t] (* 60 (minutes t)))
(defn days    [t] (* 24 (hours t)))

(defn ms-ago [ms]
  (- (System/currentTimeMillis) ms))

(defn kbytes [b] (* b 1024))
(defn mbytes [b] (* b 1024 1024))

(defn open-file [dir-comps filename]
  (let [d (str-join (System/getProperty "file.separator")
                    dir-comps)
        f (str-join (System/getProperty "file.separator")
                    [d filename])]
    (.mkdir (new File d))
    (new File f)))

(defn sha1-hash [& more]
  (DigestUtils/shaHex (apply str more)))

(defmacro with-timing [e]
  `(let [s# (System/nanoTime)
         r# ~e
         f# (System/nanoTime)]
     [(int (/ (- f# s#) 1e6)) r#]))


(def truncation-factor 2)

(defn insert-and-truncate! [list-ref item soft-limit]
  (if (> (count @list-ref) (* soft-limit truncation-factor))
    (ref-set list-ref
	     (cons item (take soft-limit @list-ref)))
    (ref-set list-ref (cons item @list-ref))))

;; Formatters

(defn- comma-helper [s]
  (let [f (take 3 s)
	r (drop 3 s)]
    (if (= (count r) 0)
      f
      (append (comma-helper r) [\,] (reverse f)))))

(defn comma-format [i]
  (apply str
	 (reverse (comma-helper (reverse (str i))))))

(def yyyy-mm-dd-formatter (new SimpleDateFormat "yyyy-MM-dd"))

(defn format-yyyy-mm-dd [d]
  (.format yyyy-mm-dd-formatter d))

(def yymmdd-formatter (new SimpleDateFormat "yyyyMMdd"))

(defn format-yyyymmdd [d]
  (.format yymmdd-formatter d))

(defn today []
  (format-yyyymmdd (new Date)))

(def timestamp-formatter (new SimpleDateFormat "h:mm a EEE M/d"))
(def date-first-timestamp-formatter (new SimpleDateFormat "M/d h:mm a"))

(defn format-timestamp [d]
  (.format timestamp-formatter d))

(defn format-date-first-timestamp [d]
  (.format date-first-timestamp-formatter d))

(defn pluralize [word val]
  (if (= val 1) word (str word "s")))

(defn format-interval [i]
  (let [vals    [(.getYears i)
                 (.getMonths i)
                 (.getDays i)
                 (.getHours i)
                 (.getMinutes i)]
        labels  ["year" "month" "day" "hour" "minute"]
        arr     (into [] (for [[l v] (map vector labels vals) :when (> v 0)]
                           (str v " " (pluralize l v))))]
    (join arr ", ")))

(defn apply-formats [formats d]
  (into {} (for [[k v] d]
             (if-let [f  (formats k)]
               [k (f v)]
               [k v]))))

(defn gmt-string
  ([] (gmt-string (new Date)))
  ([dt]
     (let [df (new SimpleDateFormat "EEE, dd MMM yyyy kk:mm:ss z")]
       (.setTimeZone df (TimeZone/getTimeZone "GMT"))
       (.format df dt))))

;; JSON responses

(defmethod print-json Date
  [d]
  (print-json (format-yyyy-mm-dd d)))

(defn resp-error [message]
  {:status 400 :headers {} :body message})

(defn resp-success [message]
  {:status 200 :headers {} :body (json-str message)})

;; Database

(defn do-cmds [query]
  (with-connection *db*
    (do-commands query)))

(defn do-prepared! [& args]
  (with-connection *db*
    (apply do-prepared args)))

(defn do-update [& args]
  (with-connection *db*
    (apply update-values args)))

(defn do-select [query]
  (with-connection *db*
    (with-query-results rs query
      (doall rs))))

(defn do-count [query]
  ((first (with-connection *db*
	    (with-query-results rs query
	      (vec rs))))
   :count))

(defn do-delete [table query]
  (with-connection *db*
    (delete-rows table query)))

(defn do-insert [table cols values]
  (with-connection *db*
    (insert-values table cols values)))

(defn assert-update
  ([res ok err] (if (not (= (first res) 1)) err ok))
  ([res] (assert-update res true false)))

(defn sql-array [type arr]
  (with-connection *db*
    (.createArrayOf (connection) type (into-array arr))))

(defn execute-query! [query & objects]
  (with-connection *db*
    (let [stmt (.prepareStatement (connection) query)]
      (doseq [[i o] (map vector (iterate inc 1) objects)]
        (.setObject stmt i o))
      (println "update: " (.executeQuery stmt)))))
              

;; Parsing

(defn maybe-parse-int 
  ([s] (Integer/parseInt s))
  ([s default]
     (try (Integer/parseInt s)
          (catch NumberFormatException _ default))))

(defn maybe-parse-long [s f]
  (if s (Long/parseLong s) f))

(defn url-decode [text]
  (URLDecoder/decode text "UTF-8"))

; TODO: this duplicates str-utils, should be removed
(defn #^String lower-case
  "Converts string to all lower-case."
  [#^String s]
  (.toLowerCase s))

;; 404

(defn unknown-page [& more]
  [404 "Page not Found"])

;; Templates

(def template-group (new StringTemplateGroup "dumpfm" "template"))
(.setRefreshInterval template-group 3)

(defn fetch-template [template session]
  (try
    (let [st (.getInstanceOf template-group template)]
      (if (session :nick)
	      (doto st
	        (.setAttribute "user_email" (session :email))
	        (.setAttribute "user_nick" (session :nick))
	        (.setAttribute "user_avatar" (if (non-empty-string? (session :avatar))
					 (session :avatar) nil))
	        (.setAttribute "isadmin" (session :is_admin))
	        (.setAttribute "domain" config/*server-url*))
	      (doto st
	        (.setAttribute "domain" config/*server-url*))))
    (catch Exception e nil)))

(defn fetch-template-fragment [template]
  (.getInstanceOf template-group template))

(defn serve-template [template session]
  (.toString (fetch-template template session)))

(defn first-or-nil [l]
  (if (empty? l) nil (first l)))

;; VIP

(defn is-vip? [session]
  (session :is_admin))

(defmacro if-vip [e]
  "Evaluates expr if user is vip otherwise returns 404. Can only be used
   where session is defined."
  `(if (is-vip? ~'session) ~e (unknown-page)))