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Beam Bots - The framework for resilient robotics.

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bb lib bb error state invalid.ex
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lib/bb/error/state/invalid.ex 

# SPDX-FileCopyrightText: 2025 James Harton

#

# SPDX-License-Identifier: Apache-2.0



defmodule BB.Error.State.Invalid do

  @moduledoc """

  Invalid state reference.



  Raised when attempting to transition to or reference a state that

  is not defined in the robot's DSL.

  """

  use BB.Error,

    class: :invalid,

    fields: [:state, :valid_states]



  @type t :: %__MODULE__{

          state: atom(),

          valid_states: [atom()]

        }



  defimpl BB.Error.Severity do

    def severity(_), do: :error

  end



  def message(%{state: state, valid_states: valid}) do

    valid_str = Enum.map_join(valid, ", ", &inspect/1)

    "Invalid state #{inspect(state)}. Valid states: #{valid_str}"

  end

end