toy/image_optim

# frozen_string_literal: true

require 'image_optim/worker'

class ImageOptim
  class Worker
    # http://www.lcdf.org/gifsicle/
    class Gifsicle < Worker
      # If interlace specified initialize one instance
      # Otherwise initialize two, one with interlace off and one with on
      def self.init(image_optim, options = {})
        return super if options.key?(:interlace)

        [false, true].map do |interlace|
          new(image_optim, options.merge(interlace: interlace))
        end
      end

      INTERLACE_OPTION =
      option(:interlace, false, TrueFalseNil, 'Interlace: ' \
                                              '`true` - interlace on, ' \
                                              '`false` - interlace off, ' \
                                              '`nil` - as is in original image ' \
                                              '(defaults to running two instances, one with interlace off and ' \
                                              'one with on)') do |v|
        TrueFalseNil.convert(v)
      end

      LEVEL_OPTION =
      option(:level, 3, 'Compression level: ' \
                        '`1` - light and fast, ' \
                        '`2` - normal, ' \
                        '`3` - heavy (slower)') do |v|
        OptionHelpers.limit_with_range(v.to_i, 1..3)
      end

      CAREFUL_OPTION =
      option(:careful, false, 'Avoid bugs with some software'){ |v| !!v }

      def optimize(src, dst, options = {})
        args = %W[
          --output=#{dst}
          --no-comments
          --no-names
          --same-delay
          --same-loopcount
          --no-warnings
          --
          #{src}
        ]

        if resolve_bin!(:gifsicle).version >= '1.85'
          args.unshift '--no-extensions', '--no-app-extensions'
        end

        unless interlace.nil?
          args.unshift interlace ? '--interlace' : '--no-interlace'
        end
        args.unshift '--careful' if careful
        args.unshift "--optimize=#{level}" if level
        execute(:gifsicle, args, options) && optimized?(src, dst)
      end
    end
  end
end