module Webpacker::Helper

def asset_pack_path(name, **options)
  if current_webpacker_instance.config.extract_css? || !stylesheet?(name)
    path_to_asset(current_webpacker_instance.manifest.lookup!(name), options)
  end
end

def asset_pack_url(name, **options)
  if current_webpacker_instance.config.extract_css? || !stylesheet?(name)
    url_to_asset(current_webpacker_instance.manifest.lookup!(name), options)
  end
end

def current_webpacker_instance
  Webpacker.instance
end

def favicon_pack_tag(name, **options)
  favicon_link_tag(resolve_path_to_image(name), options)
end

def image_pack_tag(name, **options)

<%= image_pack_tag 'picture.png', srcset: { 'picture-2x.png' => '2x' } %>


<%= image_pack_tag 'application.png', size: '16x10', alt: 'Edit Entry' %>

Example:

Creates an image tag that references the named pack file.

def image_pack_tag(name, **options)
  if options[:srcset] && !options[:srcset].is_a?(String)
    options[:srcset] = options[:srcset].map do |src_name, size|
      "#{resolve_path_to_image(src_name)} #{size}"
    end.join(", ")
  end
  image_tag(resolve_path_to_image(name), options)
end

def javascript_pack_tag(*names, **options)
  javascript_include_tag(*sources_from_manifest_entries(names, type: :javascript), **options)
end

def javascript_packs_with_chunks_tag(*names, **options)
  javascript_include_tag(*sources_from_manifest_entrypoints(names, type: :javascript), **options)
end

def preload_pack_asset(name, **options)
  if self.class.method_defined?(:preload_link_tag)
    preload_link_tag(current_webpacker_instance.manifest.lookup!(name), options)
  else
    raise "You need Rails >= 5.2 to use this tag."
  end
end

def resolve_path_to_image(name)
  path = name.starts_with?("media/images/") ? name : "media/images/#{name}"
  path_to_asset(current_webpacker_instance.manifest.lookup!(path))
rescue
  path_to_asset(current_webpacker_instance.manifest.lookup!(name))
end

def sources_from_manifest_entries(names, type:)
  names.map { |name| current_webpacker_instance.manifest.lookup!(name, type: type) }.flatten
end

def sources_from_manifest_entrypoints(names, type:)
  names.map { |name| current_webpacker_instance.manifest.lookup_pack_with_chunks!(name, type: type) }.flatten.uniq
end

def stylesheet?(name)
  File.extname(name) == ".css"
end

def stylesheet_pack_tag(*names, **options)
  if current_webpacker_instance.config.extract_css?
    stylesheet_link_tag(*sources_from_manifest_entries(names, type: :stylesheet), **options)
  end
end

def stylesheet_packs_with_chunks_tag(*names, **options)
  if current_webpacker_instance.config.extract_css?
    stylesheet_link_tag(*sources_from_manifest_entrypoints(names, type: :stylesheet), **options)
  end
end