# Used to generate part of metadata.rb.  Unfortunately, I am unable to fill
# in appropriate access methods so I generate with get_string and then manually
# update.  In future versions I will just run this twice with old and new src
# and manually splice in new data (or fixes).
#
# % find ../metadata-extractor/Source/ -name '*Directory.java' | xargs grep TAG_ | grep 'public static final' | ruby tools/gen.rb

# FIXME: I made style tweaks and removed redundant data manually in generated
#   source.  I should update this tool to do all that.
# FIXME: I should add a generated comment in metadata generated file.

def normalize_directory_name(path)
  path.tr('/', '.')
end

def normalize_tag_name(capname)
  name = capname.split('_').map(&:capitalize).join(' ')
  [name, "TAG_#{capname}"]
end

# 'ExifSubIFDDirectory' => 'Exif Sub IFD0'
def humanize_directory_name(s)
  s = s.gsub('Directory', '')
  s.split(/([A-Z]+[a-z]+)/).map { |a| a == '' ? nil : a }.compact.join(' ')
end

io = $stdin
directories = {}

io.readlines.each do |line|
  #  .../IptcDirectory.java: public static final int TAG_BY_LINE = 80;
  next if %r{Source/[/]?(?<dir_name>.*).java:.*TAG_(?<tag_name>[\S]+)} !~ line
  directory_name = normalize_directory_name dir_name
  directories[directory_name] ||= []
  directories[directory_name] << normalize_tag_name(tag_name)
end

directories.each do |directory, tag_names|
  class_name = directory.split('.')[-1]
  puts <<"EOS"
  # GENERATED
  class #{class_name} < Directory
    java_import #{directory}

    def self.directory_class
      #{directory}
    end"

    TAGS = {
EOS
  tag_names.each do |name, original_name|
    puts "'#{name}' => ['#{original_name}', :get_string],"
  end
  puts <<EOS
    }.freeze
  end
EOS
end

puts 'DIRECTORY_MAP = {'
directories.each do |directory, _|
  class_name = directory.split('.')[-1]
  puts "'#{humanize_directory_name(class_name)}' => #{class_name},"
end
puts '}.freeze'