(ns blob)


(defn abnormal? [color]
  (= color :abnormal))


(defn color [grid x y]
  (get-in grid [x y]))


(defn recolor [grid x y color]
  (assoc-in grid [x y] color))


(defn column-count [grid]
  (count (first grid)))


(defn row-count [grid]
  (count grid))


(defn neighbors [grid x y]
  [[x (dec y)] [x (inc y)]
   [(dec x) y] [(inc x) y]])


(defn collect-cells [grid x y visited]
  (if-not (abnormal? (color grid x y))
    visited
    (if (contains? visited [x y])
      visited
      (reduce (fn [vis [i j]]
                (collect-cells grid i j vis))
              (conj visited [x y])
              (neighbors grid x y)))))


(defn count-cells [grid x y]
  (count (collect-cells grid x y #{})))