#!/usr/bin/env ruby
# frozen_string_literal: true

require_relative "graph"

class Main
  def run
    lines = $stdin.readlines(chomp: true)
    graph = Graph.new(lines)
    counts = Hash.new(0)
    counts[graph.start.x] = 1

    process_graph(lines, graph, counts)
    puts counts.values.sum
  end

  def process_graph(lines, graph, counts)
    lines.each_with_index do |line, y|
      line.chars.each_with_index do |char, x|
        current = Point.new(x, y)

        next unless graph.at(current) == "^"

        distribute_counts(x, y, counts)
      end
    end
  end

  # When we encounter a "^", we split the count to the west and east positions
  # and reset the current position count to 0.
  def distribute_counts(x, y, counts)
    peek_west = Point.new(x - 1, y)
    peek_east = Point.new(x + 1, y)

    counts[peek_west.x] += counts[x]
    counts[peek_east.x] += counts[x]
    counts[x] = 0
  end
end

Main.new.run