defmodule LayoutBuilder.Layout.Col do
  use Ecto.Schema
  import Ecto.Changeset
  alias Ecto.UUID
  alias LayoutBuilder.Layout.Row

  @moduledoc """
  Col represents a column inside a Row of a Layout.
  """

  @type t() :: %__MODULE__{
    id: Ecto.UUID.t() | nil,
    name: String.t(),
    rows: list(Row.t()) | nil,
  }

  embedded_schema do
    field :name, :string
    embeds_many :rows, Row
  end

  @spec build_col :: %__MODULE__{
    id: Ecto.UUID.t(),
    name: nil,
    rows: []
  }
  def build_col(), do: %__MODULE__{id: UUID.generate()}

  def changeset(%__MODULE__{} = struct, attrs) do
    change(struct)
    |> changeset(attrs)
  end

  def changeset(%Ecto.Changeset{} = change, %__MODULE__{} = attrs) do
    changeset(change, Map.from_struct(attrs))
  end

  def changeset(%Ecto.Changeset{} = change, %{} = attrs) do
    change
    |> cast(attrs, [:name])
    |> cast_embed(:rows)
  end
end