module Fontist
  module Utils
    module ExeExtractor
      def cab_extract(exe_file, download: true, font_ext: /.ttf|.otf|.ttc/i)
        download = @downloaded === true ? false : download

        exe_file = download_file(exe_file).path if download
        cab_file = decompressor.search(exe_file)
        cabbed_fonts = grep_fonts(cab_file.files, font_ext) || []
        fonts_paths = extract_cabbed_fonts_to_assets(cabbed_fonts)

        block_given? ? yield(fonts_paths) : fonts_paths
      end

      def exe_extract(source)
        cab_file = decompressor.search(download_file(source).path)
        fonts_paths = build_cab_file_hash(cab_file.files)
        block_given? ? yield(fonts_paths) : fonts_paths
      end

      private

      def decompressor
        @decompressor ||= (
          require "libmspack"
          LibMsPack::CabDecompressor.new
        )
      end

      def grep_fonts(file, font_ext)
        Array.new.tap do |fonts|
          while file
            fonts.push(file) if file.filename.match(font_ext)
            file = file.next
          end
        end
      end

      def extract_cabbed_fonts_to_assets(cabbed_fonts)
        Array.new.tap do |fonts|
          cabbed_fonts.each do |font|
            font_path = fonts_path.join(font.filename).to_s
            decompressor.extract(font, font_path)

            fonts.push(font_path)
          end
        end
      end

      def build_cab_file_hash(file)
        while file
          filename = file.filename
          if filename.include?("cab") || filename.include?("msi")
            file_path = File.join(Dir.mktmpdir, filename)
            decompressor.extract(file, file_path)

            return file_path
          end

          file = file.next
        end
      end
    end
  end
end