defmodule Localiser.Domain.Schema.User do
  use Ecto.Schema
  import Ecto.Changeset

  schema "users" do
    field :username, :string
    field :password_hash, :string, redact: true
    field :password, :string, virtual: true, redact: true

    timestamps(type: :utc_datetime)
  end

  @doc false
  def changeset(user, attrs) do
    user
    |> cast(attrs, [:username, :password])
    |> validate_required([:username, :password])
    |> validate_length(:password, min: 8)
    |> unique_constraint(:username)
    |> hash_password()
  end

  defp hash_password(%Ecto.Changeset{valid?: true, changes: %{password: pw}} = changeset) do
    put_change(changeset, :password_hash, Argon2.hash_pwd_salt(pw))
  end

  defp hash_password(changeset), do: changeset
end