module StorageAdapters
  class BaseAdapter
    def initialize(storage_location)
      @storage_location = storage_location
    end

    # Scan for video files and return array of relative paths
    def scan
      raise NotImplementedError, "#{self.class} must implement #scan"
    end

    # Generate streaming URL for a video
    def stream_url(video)
      raise NotImplementedError, "#{self.class} must implement #stream_url"
    end

    # Check if file exists at path
    def exists?(file_path)
      raise NotImplementedError, "#{self.class} must implement #exists?"
    end

    # Check if storage can be read from
    def readable?
      raise NotImplementedError, "#{self.class} must implement #readable?"
    end

    # Check if storage can be written to
    def writable?
      @storage_location.writable?
    end

    # Write/copy file to storage
    def write(source_path, dest_path)
      raise NotImplementedError, "#{self.class} must implement #write"
    end

    # Download file to local temp path (for processing)
    def download_to_temp(video)
      raise NotImplementedError, "#{self.class} must implement #download_to_temp"
    end

    protected

    attr_reader :storage_location
  end
end