defmodule Towerops.Lidar.Test.FakeParser do
  @moduledoc """
  Test-only stand-in for `Towerops.Lidar.Sources.ThreeDep.GdalParser`.

  Tests configure canned tile responses per project name via `put_state/1`,
  which are stored in an ETS table so the parser process can be the test
  process or any Oban-spawned worker.
  """

  @table :lidar_catalog_fake_parser

  def put_state(map) do
    ensure_table()
    :ets.insert(@table, {:state, map})
  end

  def enumerate(project_name, _opts) do
    ensure_table()

    case :ets.lookup(@table, :state) do
      [{:state, map}] ->
        case Map.fetch(map, project_name) do
          {:ok, {:error, _} = err} -> err
          {:ok, tiles} -> {:ok, tiles}
          :error -> {:error, :unknown_project}
        end

      _ ->
        {:error, :no_state}
    end
  end

  defp ensure_table do
    case :ets.info(@table) do
      :undefined -> :ets.new(@table, [:named_table, :public, :set])
      _ -> @table
    end
  end
end