(ns cat.routes.home
  (:require [cat.layout :as layout]
            [cat.config :refer [env]]
            [cat.db.core :refer [*db*] :as db]
            [compojure.core :refer [defroutes GET POST]]
            [ring.util.http-response :as response]
            [struct.core :as st]
            [clojure.tools.logging :as log]
            [cat.layout :refer [error-page]]
            [clojure.string :as s]))

(def request_relation-schema
  [[:to_id st/required st/integer-str]])

(defn- home-page [params]
  (layout/render "home.html" params))

(defn- get-relations []
  (map
   (fn [relation] (select-keys relation [:name :name_2]))
   (db/get-relations)))

(defn- get-users []
  (db/get-users))

(defn- response-wrong-parameters []
  (error-page {:status  400
               :title   "Wrong request parameters"
               :message "Please contact your system administrator to fix this issue"}))

(defn show-home [req]
  (let [users (get-users)
        relations (get-relations)
        user (-> (get-in req [:session :user]))
        user-relations (when user
                         (seq (filter (fn [rel]
                                        (or
                                         (= (:name rel) (:name user))
                                         (= (:name_2 rel) (:name user))))
                                      relations)))
        other_users (when user
                      (seq (filter (fn [usr] (not (= (:id usr) (:id user))))
                                   users)))
        rel-requests-out (seq (db/get-relation-requests-from-user {:from_id (:id user)}))
        rel-requests-in (seq (db/get-relation-requests-to-user {:to_id (:id user)}))
        non_requested_users (seq (filter (fn [other-user] (not (some (partial = (:id other-user)) (map :to_id rel-requests-out)))) other_users))]
    (log/debug (str "Session: " (:session req)))
               ;(log/info (str "Relation requests: \n OUTGOING: " rel-requests-out "\n INCOMING: " rel-requests-in))
               ;(log/info (str "User relations: " user-relations))
               ;(log/info (str "Other Users: " other_users))
               ;(log/info (str "rel reqs out: " rel-requests-out))
               ;(log/info (str "rel reqs out id: " (seq (map :to_id rel-requests-out))))
    (home-page {:relations        relations
                :users            users
                :user             user
                :user-relations   user-relations
                :rel-requests-out rel-requests-out
                :rel-requests-in  rel-requests-in
                :non_requested_users non_requested_users
                :flash            (:flash req)})))

(defn show-relations
  []
  (let [users (db/get-users)
        relations (db/get-relations)
        used-node-ids (set (flatten (map (fn [ln] [(:from_id ln) (:to_id ln)]) relations)))
        filtered-users (filter (fn [{id :id}] (contains? used-node-ids id)) users)
        id-index-map (:map (reduce (fn [{map :map idx :index} usr]
                                     {:map   (assoc map (:id usr) idx)
                                      :index (inc idx)})
                                   {:map {} :index 0}
                                   filtered-users))
        rels-indexed (map (fn [{src :from_id target :to_id}]
                            {:source (get id-index-map src)
                             :target (get id-index-map target)
                             :value  (+ 20 (rand-int 30))})
                          relations)
        nodes-indexed (->> filtered-users
                           (map (fn [usr]
                                  (-> usr
                                      (dissoc :gender :id)
                                      (assoc :index (get id-index-map (:id usr)))
                                      (assoc :group (rand-int 5))))))]
    (response/ok {:nodes nodes-indexed
                  :links rels-indexed})))

(defn update-relationrequest-status
  [id body]
  (let [rr_id_map {:id id}
        success (cond
                  (contains? body :accept)
                  (do
                    (let [rr (db/get-relation-request rr_id_map)]
                      (db/create-relation! {:from_id (:from_id rr) :to_id (:to_id rr)}))
                    (db/update-relation-request-status! (assoc rr_id_map :status "accepted")))
                  (contains? body :decline)
                  (db/update-relation-request-status! (assoc rr_id_map :status "declined"))
                  :else false)]
    (if success
      (response/found "/")
      (response-wrong-parameters))))

(defn create-relation-request
  [req]
  (let [data (:params req)
        [err result] (st/validate data request_relation-schema)
        from-id (get-in req [:session :user :id])]
    (if (nil? from-id) (response/found (error-page
                                        {:status 400
                                         :title  "No user id found in session"})))
    (log/debug "Post to " (:uri req) "\n with data " result)
    (if (nil? err)
      (do
        (log/debug "Create relation request")
        (db/create-relation-request! {:from_id from-id
                                      :to_id   (:to_id result)
                                      :status  "open"})
        (response/found "/"))
      (do
        (log/debug "Relation request failed")
        (log/debug err)
        (response/unprocessable-entity "Incorrect input")))))