-module(day11).
-export([start/0]).

steps(X, Y)
  -> lists:max([abs(X), abs(Y), abs((-1 * X) - Y)]).

count_steps(Input)
  -> count_steps(re:split(Input, ","), 0, 0, 0).
count_steps([], X, Y, MaxSteps)
  -> {X, Y, steps(X, Y), lists:max([MaxSteps, steps(X, Y)])};
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"nw">> -> count_steps(Tail, X - 1, Y, lists:max([MaxSteps, steps(X, Y)]));
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"n">> -> count_steps(Tail, X, Y - 1, lists:max([MaxSteps, steps(X, Y)]));
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"ne">> -> count_steps(Tail, X + 1, Y - 1, lists:max([MaxSteps, steps(X, Y)]));
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"sw">> -> count_steps(Tail, X - 1, Y + 1, lists:max([MaxSteps, steps(X, Y)]));
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"s">> -> count_steps(Tail, X, Y + 1, lists:max([MaxSteps, steps(X, Y)]));
count_steps([Head|Tail], X, Y, MaxSteps)
  when Head == <<"se">> -> count_steps(Tail, X + 1, Y, lists:max([MaxSteps, steps(X, Y)])).

start()
  -> io:fwrite("~p~n", [count_steps("ne,ne,ne")]),
     io:fwrite("~p~n", [count_steps("ne,ne,sw,sw")]),
     io:fwrite("~p~n", [count_steps("ne,ne,s,s")]),
     io:fwrite("~p~n", [count_steps("se,sw,se,sw,sw")]),
     io:fwrite("~p~n", 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