defmodule Bbox.Parties.Party do
  @moduledoc """
  Party in the election and haves a list of candidates.
  """
  use Ecto.Schema
  import Ecto.Changeset
  alias Bbox.Candidates.Candidate

  @primary_key false
  @foreign_key_type :string
  schema "parties" do
    field(:initials, :string)
    field(:name, :string)
    field(:description, :string)
    has_many(:candidates, Candidate, foreign_key: :party_initials, references: :initials)

    timestamps()
  end

  def changeset(party, params \\ %{}) do
    party
    |> cast(params, [:initials, :name, :description])
    |> validate_required([:initials, :name])
    |> validate_length(:initials,
      min: 2,
      max: 6,
      message: "initials must be at least 2 characters and at most 6 characters"
    )
    |> validate_length(:name, min: 3, message: "name must be at least 3 characters")
    |> validate_length(:description, min: 3, message: "description must be at least 3 characters")
    |> unique_constraint(:name, message: "name already exists")
  end
end