module XamarinTestCloud

  # Appropriate for files under features/, <tmpdir>/ and test_servers/
  #
  # Not appropriate for app and dysm files.
  #
  # To create a Cucumber configuration instance, use `TestFile.cucumber_config`.
  class TestFile

    def self.file_digest(file, digest=:SHA256)
      case digest
        when :SHA256
          require "digest"
          Digest::SHA256.file(file).hexdigest
        when :MD5
          require "digest/md5"
          Digest::MD5.file(file).hexdigest
        else
          raise ArgumentError, %Q[Invalid digest type: #{digest}.
Only :SHA256 or :MD5 are supported
]
      end
    end

    # Special handling for Cucumber configuration files.
    #
    # The server expects the remote file name to be _exactly_ config/cucumber.yml
    def self.cucumber_config(file)
      test_file = TestFile.new(file, File.dirname(file))
      test_file.instance_variable_set(:@remote_path, "config/cucumber.yml")
      test_file
    end

    attr_reader :path, :file_instance, :digest, :remote_path

    # @param [String] path Needs to be expanded
    # @param [String] basedir Needs to be the beginning of the path
    def initialize(path, basedir)
      @path = path
      @basedir = basedir

      expanded = File.expand_path(path)
      if path != File.expand_path(expanded)
        raise ArgumentError, %Q[Path must be expanded:

    path: #{path}
expanded: #{expanded}
]
      end

      if !path.start_with?(basedir)
        raise ArgumentError, %Q[Path must start with basedir:

    path: #{path}
 basedir: #{basedir}

]
      end
    end

    def to_s
      %Q[#<TestFile: #{@path} #{@digest} #{@remote_path}>]
    end

    def inspect
      to_s
    end

    def file_instance
      @file_instance ||= File.new(path)
    end

    def digest
      @digest ||= TestFile.file_digest(path)
    end

    def remote_path
      @remote_path ||= begin
        require "pathname"
        absolute = Pathname.new(path)
        root  = Pathname.new(basedir)
        relative = absolute.relative_path_from(root)
        relative.to_s
      end
    end

    private

    def basedir
      @basedir
    end
  end
end