class PotentialTriangle
  attr_reader :sides

  def initialize(line)
    @sides = line.split.map(&:to_i)
  end

  %w[a b c].each_with_index do |side, index|
    define_method("side_#{side}") do
      sides[index]
    end
  end

  def valid?
    side_a_valid? && side_b_valid? && side_c_valid?
  end

  def side_a_valid?
    side_a < side_b + side_c
  end

  def side_b_valid?
    side_b < side_a + side_c
  end

  def side_c_valid?
    side_c < side_b + side_a
  end
end

input = STDIN.read.chomp
potential_triangle_lines = input.split("\n")
potential_triangles = potential_triangle_lines.map { |line| PotentialTriangle.new line }
valid_triangles = potential_triangles.count(&:valid?)

puts "Part 1: #{valid_triangles}"

grouped_triangle_lines = potential_triangle_lines.join(" ").split.each_with_index.each_with_object([[], [], []]) do |item_index, groups|
  item, index = item_index
  groups[index % 3] << item
  groups
end

sideways_triangle_lines = grouped_triangle_lines.flatten.each_slice(3).to_a.map { |tri| tri.join " " }
sideways_triangles = sideways_triangle_lines.map { |line| PotentialTriangle.new line }
valid_sideways_triangles = sideways_triangles.count(&:valid?)

puts "Part 2: #{valid_sideways_triangles}"