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(ns org.vuxu.aoc2021.day25
(:require [clojure.string :as str]))
(def data
(->> (slurp "day25")
str/split-lines
(mapv (partial mapv identity))))
(defn step-east [data]
(let [lx (count (first data))]
(vec (for [y (range (count data))]
(vec (for [x (range lx)]
(cond
(and (= (get-in data [y (mod (dec x) lx)]) \>)
(= (get-in data [y x]) \.))
\>
(and (= (get-in data [y x]) \>)
(= (get-in data [y (mod (inc x) lx)]) \.))
\.
:else
(get-in data [y x]))))))))
(defn step-south [data]
(let [ly (count data)]
(vec (for [y (range ly)]
(vec (for [x (range (count (first data)))]
(cond
(and (= (get-in data [(mod (dec y) ly) x]) \v)
(= (get-in data [y x]) \.))
\v
(and (= (get-in data [y x]) \v)
(= (get-in data [(mod (inc y) ly) x]) \.))
\.
:else
(get-in data [y x]))))))))
(def part1
(loop [i 1
data data]
(let [data' (step-south (step-east data))]
(if (= data data')
i
(recur (inc i) data')))))
;; => 601
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