class Lookbook::Preview

def component
  components.first
end

def components
  @_components ||= ComponentCollection.new(examples.flat_map(&:components).uniq(&:path))
end

def default_example
  visible_examples.first
end

def display_options
  global_options = Lookbook.config.preview_display_options
  global_options.deep_merge(fetch_config(:display_options, {}))
end

def example(example_name)
  examples.find { |m| m.name == example_name.to_s }
end

def example_entities
  public_methods = preview_class.public_instance_methods(false)
  method_objects = code_object.meths.select { |m| public_methods.include?(m.name) }
  method_objects.map.with_index { |code_object, i| PreviewExample.new(code_object, self, position: i) }
end

def examples
  @_examples ||= PreviewExampleCollection.new(load_examples)
end

def guess_components
  [preview_class.name.chomp("Preview").constantize]
rescue
  []
end

def initialize(code_object)
  @code_object = code_object
  @preview_class = code_object.path.constantize
  @file_path = Pathname(code_object.file)
  @base_directories = Engine.preview_paths
  cleaned_path = relative_file_path.to_s
    .gsub(/\/(component_preview|preview)(\..*)$/, "")
    .gsub(/(_component_preview|_preview)(\..*)$/, "")
  @lookup_path = PathUtils.to_lookup_path(cleaned_path)
end

def layout
  preview_class.instance_variable_get(:@layout)
end

def load_examples
  return example_entities unless code_object.groups.any?
  example_entities.group_by(&:group).flat_map do |group_name, grouped_examples|
    group_name.nil? ? grouped_examples : PreviewGroup.new(group_name.presence || label.pluralize, grouped_examples, self)
  end
end

def preview_class_name
  preview_class.name
end

def url_path
  lookbook_inspect_path(path)
end

def visible_examples
  @_visible_examples ||= PreviewExampleCollection.new(examples.select(&:visible?))
end