# frozen_string_literal: true

require 'json'
require 'open-uri'
require 'open-uri/cached'
require 'uri'

class MusicBrainzLinkInlineMacro < Asciidoctor::Extensions::InlineMacroProcessor
  use_dsl

  named :musicbrainz
  name_positional_attributes 'caption', 'type'
  default_attributes 'type' => 'release'

  def process(parent, target, attrs)
    doc = parent.document
    root_endpoint = 'https://musicbrainz.org/ws/2'

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

      uri = %(#{root_endpoint}/#{attrs['type']}/#{target})

      if attrs['caption'].nil?
        metadata = OpenURI.open_uri(uri, headers) { |f| JSON.parse(f.read) }
        attrs['caption'] ||= case attrs['type']
                             when 'artist', 'area', 'events', 'genre', 'instrument', 'label', 'place', 'series'
                               metadata['name']
                             when 'recording', 'release-group', 'release', 'cdstub', 'work'
                               metadata['title']
                             when 'url'
                               metadata['resource']
                             end
      end

      target = %(https://musicbrainz.org/#{attrs['type']}/#{target})
      doc.register :links, target
      create_anchor parent, attrs['caption'], type: :link, target: target
    rescue 
      warning = %(error while getting Musicbrainz database object '#{target}: #{e}')
      warn_or_raise doc, warning
      reader.push_include warning, target, target, 1, attrs
    end
  end
end