defmodule Ami.Question do
  use Ecto.Schema

  import Ecto.{
    Query,
    Changeset
  }

  alias Ami.{
    Repo,
    Quiz,
    Answer
  }

  schema "questions" do
    field(:correct_answers, :string)
    field(:value, :string)
    field(:label, :string)
    field(:position, :integer)
    field(:answer_type, :integer)

    belongs_to(:quiz, Quiz)

    has_many(:answers, Answer, on_delete: :delete_all, on_replace: :delete)
  end

  @doc """
      Extract the values as array from question values string
  """
  def extract_options(value) when is_nil(value), do: []

  def extract_options(value) do
    String.replace(value, ~r/\[|\]/, " ")
    |> String.split("\",")
    |> Enum.map(&String.replace(&1, ~r/\"/, ""))
    |> Enum.map(&String.trim(&1))
  end

  def changeset(struct, params \\ %{}) do
    struct
    |> cast(params, [:correct_answers, :value, :label, :position, :answer_type, :quiz_id])
    |> validate_required([
      :label,
      :answer_type
    ])
    |> cast_assoc(:answers)
    |> case do
      %{valid?: false, errors: errors} = changeset when errors == [
        label: {"can't be blank", [validation: :required]},
        answer_type: {"can't be blank", [validation: :required]}
      ] ->
        %{changeset | action: :ignore}

      changeset ->
        changeset
    end
  end

  def answer_types do
    [
      {"Single correct answer", 0},
      {"Multiple correct answers", 1}
      # {"Complete the text", 2},
      # {"Matching terms to terms", 3}
    ]
  end

  def stringify_answer_type(question) do
    {str, val} =
      Enum.find(__MODULE__.answer_types(), fn {str, val} -> val == question.answer_type end)

    str
  end

  def update_position(id, position) do
    Repo.get!(__MODULE__, id)
    |> change(%{position: position})
    |> Repo.update()
  end
  
end