plato

defmodule Plato.Registry do
  @moduledoc """
  A registry for storing and retrieving content schemas.

  This uses an Agent to keep schemas in memory.
  """

  use Agent

  def start_link(_opts) do
    Agent.start_link(fn -> %{} end, name: __MODULE__)
  end

  @doc """
  Registers a schema in the registry.
  """
  def register_schema(%Plato.Schema{} = schema) do
    Agent.update(__MODULE__, fn schemas ->
      Map.put(schemas, schema.name, schema)
    end)
  end

  @doc """
  Gets a schema by name.
  """
  def get_schema(name) do
    Agent.get(__MODULE__, fn schemas ->
      Map.get(schemas, name)
    end)
  end

  @doc """
  Lists all registered schemas.
  """
  def list_schemas do
    Agent.get(__MODULE__, fn schemas ->
      Map.values(schemas)
    end)
  end

  @doc """
  Clears all schemas (useful for testing).
  """
  def clear do
    Agent.update(__MODULE__, fn _ -> %{} end)
  end
end