# frozen_string_literal: true

require 'json'
require 'open-uri'

class FlathubLinkInlineMacro < Asciidoctor::Extensions::InlineMacroProcessor
  use_dsl

  named :flathub
  name_positional_attributes 'caption'

  def process(parent, target, attrs)
    doc = parent.document

    # FlatHub API seems to have no documentation aside from the source code.
    # You can easily infer the API with its source code at
    # https://github.com/flathub/website.
    app_id = target
    app_metadata_uri = %(https://flathub.org/api/v2/appstream/#{app_id})

    headers = {
      'Accept' => 'application/json',
      'User-Agent' => ::Asciidoctor::FoodogsquaredCustomExtensions::USER_AGENT
    }

    if attrs['caption'].nil?
      metadata = OpenURI.open_uri(app_metadata_uri, headers) { |f| JSON.parse(f.read) }
      attrs['caption'] = metadata['name']
    end

    url = %(https://flathub.org/apps/#{app_id})
    doc.register :links, url
    create_anchor parent, attrs['caption'], type: :link, target: url
  end
end