module MetaInformation

# File lib/meta_information.rb, line 13
def get_meta(input_url)
  return not_valid_url_error unless valid_url?(input_url)
  return not_valid_url_scheme unless valid_url_scheme?(input_url)

  document = create_document(input_url)
  return nokogiri_error if document == false

  meta_hash = create_meta_array(document)
  success_hash.merge(all_meta: meta_hash)
end

# File lib/meta_information.rb, line 61
def create_document(input_url)
  uri = URI(input_url)
  res = Net::HTTP.get_response(uri)

  raise 'Response code is not 2xx' if !(res.code.to_i >= 200 && res.code.to_i <= 299)
  raise 'Response is without body' unless res.class.body_permitted?

  Nokogiri::HTML(res.body)
rescue StandardError => e
  puts e
  false
end

# File lib/meta_information.rb, line 27
def create_meta_array(document)
  document
    .css('meta').reject { |node| node_type(node).nil? }
    .map do |node|
      {
        type: node_type(node),
        name: node['name'],
        property: node['property'],
        content: node['content'],
        itemprop: node['itemprop']
      }
    end
end

# File lib/meta_information.rb, line 41
def node_type(node)
  if !node['name'].nil?
    'name'
  elsif !node['property'].nil?
    'property'
  elsif !node['itemprop'].nil?
    'itemprop'
  else
    nil
  end
end

# File lib/meta_information.rb, line 88
def nokogiri_error
  {
    success: false,
    error: 'error with parsing a document'
  }
end

# File lib/meta_information.rb, line 74
def not_valid_url_error
  {
    success: false,
    error: 'url is not valid'
  }
end

# File lib/meta_information.rb, line 81
def not_valid_url_scheme
  {
    success: false,
    error: 'url must be http(s)'
  }
end

# File lib/meta_information.rb, line 95
def success_hash
  {
    succes: 'true',
    error: ''
  }
end

# File lib/meta_information.rb, line 53
def valid_url?(uri)
  !(uri =~ URI::DEFAULT_PARSER.make_regexp).nil?
end

# File lib/meta_information.rb, line 57
def valid_url_scheme?(input_url)
  URI(input_url).is_a?(URI::HTTP)
end