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# Copyright (c) 2016-present WeWantToKnow AS
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module U3d
  class DownloadValidator
    def hash_validation(expected: nil, actual: nil)
      if expected
        if expected != actual
          UI.verbose "Expected hash is #{expected}, file hash is #{actual}"
          UI.important 'File looks corrupted (wrong hash)'
          return false
        end
      else
        UI.verbose 'No hash validation available. File is assumed correct but may not be.'
      end
      true
    end

    def size_validation(expected: nil, actual: nil)
      if expected
        if expected != actual
          UI.verbose "Expected size is #{expected}, file size is #{actual}"
          UI.important 'File looks corrupted (wrong size)'
          return false
        end
      else
        UI.verbose 'No size validation available. File is assumed correct but may not be.'
      end
      true
    end
  end

  class LinuxValidator < DownloadValidator
    def validate(package, file, definition)
      return size_validation(expected: definition[package].download_size, actual: File.size(file)) if definition[package] && definition[package].download_size
      UI.important "No file validation available, #{file} is assumed to be correct"
      true
    end
  end

  class MacValidator < DownloadValidator
    def validate(package, file, definition)
      if definition[package].download_size % 1000 && definition[package].checksum.nil?
        UI.verbose "File '#{definition[package].name}' seems external. Validation skipped"
        return true
      end
      size_validation(expected: definition[package].download_size, actual: File.size(file)) &&
        hash_validation(expected: definition[package].checksum, actual: Utils.hashfile(file))
    end
  end

  class WindowsValidator < DownloadValidator
    def validate(package, file, definition)
      # External packages have no md5 and a false size value
      if definition[package].download_size % 1000 && definition[package].checksum.nil?
        UI.verbose "File '#{definition[package].name}' seems external. Validation skipped"
        return true
      end
      rounded_size = (File.size(file).to_f / 1024).floor
      size_validation(expected: definition[package].download_size, actual: rounded_size) &&
        hash_validation(expected: definition[package].checksum, actual: Utils.hashfile(file))
    end
  end
end