class Lookbook::PageTreeBuilder

def call
  root_node = TreeNode.new
  pages.each do |page|
    current_node = root_node
    path_segments = parse_segments(page.relative_file_path)
    path_segments.each.with_index(1) do |segment, i|
      name, priority_prefix = segment
      content = page if page.depth == i # pages are always on the leaf nodes
      current_node.add_child(name, content, priority: priority_prefix) unless current_node.has_child?(name)
      current_node = current_node.get_child(name)
    end
  end
  root_node
end

def initialize(pages, include_hidden: false)
  @pages = pages.to_a
  @include_hidden = include_hidden
end

def pages
  include_hidden ? @pages : @pages.select(&:visible?)
end

def parse_segments(path)
  path.to_s.split("/").map do |segment|
    unless segment.start_with?(".")
      priority, name = PriorityPrefixParser.call(segment)
      [name, priority || 10000]
    end
  end.compact
end