58 lines
1.4 KiB
Elixir
58 lines
1.4 KiB
Elixir
defmodule Chesstrainer.Endgames.Tablebase do
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@moduledoc """
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All endgame tablebase related functions.
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"""
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alias Chesstrainer.Endgames.Tablebase
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@type result :: :win | :draw | :loss | :unknown
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@type t :: %__MODULE__{
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category: result,
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checkmate: boolean(),
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dtc: integer() | nil,
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dtm: integer() | nil,
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dtw: integer() | nil,
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dtz: integer() | nil,
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insufficient_material: boolean(),
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moves: [Tablebase.Move.t()]
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}
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defstruct category: nil,
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checkmate: false,
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dtc: nil,
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dtm: nil,
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dtw: nil,
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dtz: nil,
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insufficient_material: false,
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moves: nil
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@spec new(String.t()) ::
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{:ok, t()}
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| {:cooldown, non_neg_integer()}
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| {:error, :invalid_endgame}
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| {:error, term()}
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def new(fen) do
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case Tablebase.Cache.get(fen) do
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{_fen, tablebase} ->
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{:cache, tablebase}
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_ ->
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case Tablebase.Parser.from_fen(fen) do
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{:error, reason} ->
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{:error, reason}
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{:cooldown, remaining_ms} ->
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{:cooldown, remaining_ms}
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{:ok, tablebase} when tablebase.category == :unknown ->
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{:error, :invalid_endgame}
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{:ok, tablebase} ->
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Tablebase.Cache.put(fen, tablebase)
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{:ok, tablebase}
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end
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end
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end
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end
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