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islands_guesses

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A guesses struct and functions for the Game of Islands.

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islands_guesses lib islands guesses.ex
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lib/islands/guesses.ex 

# ┌────────────────────────────────────────────────────────────────────┐

# │ Based on the book "Functional Web Development" by Lance Halvorsen. │

# └────────────────────────────────────────────────────────────────────┘

defmodule Islands.Guesses do

  use PersistConfig



  @book_ref Application.get_env(@app, :book_ref)



  @moduledoc """

  Creates a `guesses` struct for the _Game of Islands_.

  \n##### #{@book_ref}

  """



  alias __MODULE__

  alias Islands.{Coord, Island}



  @derive [Poison.Encoder]

  @derive Jason.Encoder

  @enforce_keys [:hits, :misses]

  defstruct [:hits, :misses]



  @type t :: %Guesses{hits: Island.coords(), misses: Island.coords()}

  @type type :: :hit | :miss



  @spec new() :: t

  def new(), do: %Guesses{hits: MapSet.new(), misses: MapSet.new()}



  @spec add(t, type, Coord.t()) :: t | {:error, atom}

  def add(guesses, type, guess)



  def add(%Guesses{} = guesses, :hit, %Coord{} = guess) do

    update_in(guesses.hits, &MapSet.put(&1, guess))

  end



  def add(%Guesses{} = guesses, :miss, %Coord{} = guess) do

    update_in(guesses.misses, &MapSet.put(&1, guess))

  end



  def add(_guesses, _type, _guess), do: {:error, :invalid_guesses_args}

end