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class ExampleRegistry
  class << self
    def instance
      @instance ||= new
    end

    def reload!
      @instance = new
    end

    delegate :all, :find_by_slug, :filter_by_tag, :tags, to: :instance
  end

  def initialize
    @entries = load_entries
  end

  def all
    @entries.sort_by(&:position)
  end

  def find_by_slug(slug)
    @entries.detect { |e| e.slug == slug }
  end

  def filter_by_tag(tag)
    @entries.select { |e| e.tags.include?(tag) }.sort_by(&:position)
  end

  def tags
    @entries.flat_map(&:tags).uniq.sort
  end

  private

  def load_entries
    examples_root = Rails.root.join("app", "examples")
    return [] unless examples_root.directory?

    Dir[examples_root.join("*", "example.yml")].map do |yml_path|
      base_path = File.dirname(yml_path)
      slug = File.basename(base_path)
      data = YAML.safe_load_file(yml_path, permitted_classes: [Symbol])
      ExampleEntry.new(slug: slug, data: data, base_path: base_path)
    end
  end
end