neiam /gitgud

defmodule GitGud.Labels.Label do
  use Ecto.Schema
  import Ecto.Changeset

  alias GitGud.Organizations.Organization
  alias GitGud.Repositories.Repository

  @color_format ~r/\A#[0-9a-fA-F]{6}\z/

  schema "labels" do
    field :name, :string
    field :color, :string
    field :description, :string

    belongs_to :repository, Repository
    belongs_to :organization, Organization

    timestamps(type: :utc_datetime)
  end

  def changeset(label, attrs) do
    label
    |> cast(attrs, [:name, :color, :description, :repository_id, :organization_id])
    |> validate_required([:name, :color])
    |> validate_length(:name, min: 1, max: 80)
    |> validate_length(:description, max: 255)
    |> validate_format(:color, @color_format, message: "must be a #RRGGBB hex color")
    |> validate_one_scope()
    |> unique_constraint(:name, name: :labels_repository_id_name_index)
    |> unique_constraint(:name, name: :labels_organization_id_name_index)
    |> check_constraint(:base,
      name: :labels_scope_xor,
      message: "must belong to either a repository or an organization"
    )
  end

  defp validate_one_scope(cs) do
    case {get_field(cs, :repository_id), get_field(cs, :organization_id)} do
      {nil, nil} -> add_error(cs, :base, "must belong to a repository or an organization")
      {_, nil} -> cs
      {nil, _} -> cs
      {_, _} -> add_error(cs, :base, "may not belong to both a repository and an organization")
    end
  end

  @doc "True for labels that live at the org scope."
  def org_label?(%__MODULE__{organization_id: oid}), do: not is_nil(oid)
  def org_label?(_), do: false
end