class Middleman::MetaPages::SitemapTree

def add_path(path_parts, resource)
  first_part = path_parts.first
  if path_parts.size == 1
    sitemap_class = SitemapResource
    # Allow special sitemap resources to use custom metadata view calsses
    sitemap_class = resource.meta_pages_class if resource.respond_to? :meta_pages_class
    @children[first_part] = sitemap_class.new(resource)
  else
    @children[first_part] ||= SitemapTree.new
    @children[first_part].add_path(path_parts[1..-1], resource)
  end
end

def add_resource(resource)
  add_path(resource.path.split('/'), resource)
end

def css_classes
  ['tree'].concat(ignored? ? ['ignored'] : [])
end

def ignored?
  @children.values.all?(&:ignored?)
end

def initialize
  @children = {}
end

def render
  sorted_children_keys = @children.keys.sort do |a, b|
    a_subtree = @children[a]
    b_subtree = @children[b]
    if a_subtree.is_a? SitemapResource
      if b_subtree.is_a? SitemapResource
        a.downcase <=> b.downcase
      else
        1
      end
    elsif b_subtree.is_a? SitemapResource
      if a_subtree.is_a? SitemapResource
        b.downcase <=> a.downcase
      else
        -1
      end
    else
      a.downcase <=> b.downcase
    end
  end
  sorted_children_keys.reduce('') do |content, path_part|
    subtree = @children[path_part]
    content << "<details class='#{subtree.css_classes.join(' ')}'>"
    content << '<summary>'
    content << "<i class='icon-folder-open'></i>" unless subtree.is_a? SitemapResource
    content << "#{path_part}</summary>"
    content << subtree.render
    content << '</details>'
  end
end

def to_s
  'Sitemap Tree'
end