paper_tiger

defmodule PaperTiger.Resources.Event do
  @moduledoc """
  Handles Event resource endpoints.

  ## Endpoints

  - GET    /v1/events/:id  - Retrieve event
  - GET    /v1/events      - List events

  Note: Events are auto-generated by the system and are immutable.
  No create, update, or delete operations are supported.

  ## Event Object

      %{
        id: "evt_...",
        object: "event",
        created: 1234567890,
        type: "customer.created",
        data: %{
          object: %{
            id: "cus_...",
            object: "customer",
            # ... customer fields
          }
        },
        livemode: false
      }
  """

  import PaperTiger.Resource

  alias PaperTiger.Store.Events

  require Logger

  @doc """
  Retrieves an event by ID.
  """
  @spec retrieve(Plug.Conn.t(), String.t()) :: Plug.Conn.t()
  def retrieve(conn, id) do
    case Events.get(id) do
      {:ok, event} ->
        event
        |> maybe_expand(conn.params)
        |> then(&json_response(conn, 200, &1))

      {:error, :not_found} ->
        error_response(conn, PaperTiger.Error.not_found("event", id))
    end
  end

  @doc """
  Lists all events with pagination.

  ## Parameters

  - limit - Number of items (default: 10, max: 100)
  - starting_after - Cursor for pagination
  - ending_before - Reverse cursor
  - type - Filter by event type
  """
  @spec list(Plug.Conn.t()) :: Plug.Conn.t()
  def list(conn) do
    pagination_opts = parse_pagination_params(conn.params)

    result = Events.list(pagination_opts)

    json_response(conn, 200, result)
  end

  ## Private Functions

  defp maybe_expand(event, params) do
    expand_params = parse_expand_params(params)
    PaperTiger.Hydrator.hydrate(event, expand_params)
  end
end