defmodule Commanded.Aggregates.SnapshotAggregate do
  @moduledoc false
  defstruct [
    :name,
    :date,
  ]

  defmodule Commands do
    defmodule Create, do: defstruct [:name, :date]
  end

  defmodule Events do
    defmodule Created, do: defstruct [:name, :date]
  end

  alias Commanded.Aggregates.SnapshotAggregate
  alias Commands.Create
  alias Events.Created

  def execute(
    %SnapshotAggregate{name: nil},
    %Create{name: name, date: date})
  do
    %Created{name: name, date: date}
  end

  # state mutatators

  def apply(
    %SnapshotAggregate{} = state,
    %Created{name: name, date: date})
  do
    %SnapshotAggregate{state |
      name: name,
      date: date
    }
  end
end

alias Commanded.Aggregates.SnapshotAggregate

defimpl Commanded.Serialization.JsonDecoder, for: SnapshotAggregate do
  @doc """
  Parse the date included in the aggregate state
  """
  def decode(%SnapshotAggregate{date: date} = state) do
    %SnapshotAggregate{state |
      date: NaiveDateTime.from_iso8601!(date)
    }
  end
end