module StorageAdapters
  class LocalAdapter < BaseAdapter
    VIDEO_EXTENSIONS = %w[.mp4 .mkv .avi .mov .wmv .flv .webm .m4v].freeze

    def scan
      return [] unless readable?

      pattern = if storage_location.scan_subdirectories
        File.join(storage_location.path, "**", "*{#{VIDEO_EXTENSIONS.join(',')}}")
      else
        File.join(storage_location.path, "*{#{VIDEO_EXTENSIONS.join(',')}}")
      end

      Dir.glob(pattern, File::FNM_CASEFOLD).map do |full_path|
        full_path.sub(storage_location.path + "/", "")
      end
    end

    def stream_url(video)
      full_path(video)
    end

    def exists?(file_path)
      File.exist?(full_path_from_relative(file_path))
    end

    def readable?
      return false unless storage_location.path.present?

      File.directory?(storage_location.path) && File.readable?(storage_location.path)
    end

    def writable?
      super && File.writable?(storage_location.path)
    end

    def write(source_path, dest_path)
      dest_full_path = full_path_from_relative(dest_path)
      FileUtils.mkdir_p(File.dirname(dest_full_path))
      FileUtils.cp(source_path, dest_full_path)
      dest_path
    end

    def download_to_temp(video)
      # Already local, return path
      full_path(video)
    end

    def full_path(video)
      full_path_from_relative(video.file_path)
    end

    private

    def full_path_from_relative(file_path)
      File.join(storage_location.path, file_path)
    end
  end
end