defmodule HashFS.Agent do

  @moduledoc """
  This is a simple agent which enables your application to access a single
  instance of the store. 
  """

  defmacro __using__(opts) do
    quote do

      def start_link do
        Agent.start_link(fn -> HashFS.new(Application.get_env(unquote(opts[:otp_app]), __MODULE__, :path), name: __MODULE__) end)
      end
  
      @doc "Stores a new file in this store"
      def store(input, length) do
        Agent.get(__MODULE__, fn fs ->
          HashFS.store(fs, input, length)
        end)         
      end

      @doc "Check if the store has a value on the given address"
      def has(hash) do
        Agent.get(__MODULE__, fn fs -> HashFS.has(hash) end)
      end

      @doc "Retrieve the contents of the file at the given address"
      def retrieve(hash) do
        Agent.get(__MODULE__, fn fs -> HashFS.retrieve(hash) end)
      end

    end
  end
  
end