uci

type Engine interface {
	// Do blocks until the request is completed or an error occurs.
	Do(req Request) error

	// Respond returns and consumes the oldest response from the engine.
	// It blocks until a response is available or an error occurs.
	Respond() (Response, error)

	// Close closes the engine. Any blocked Do or Respond calls will be
	// unblocked and return ErrEngineClosed.
	Close() error
}

type Request interface {
	encoding.TextUnmarshaler
}

type RequestGo struct {
	SearchMoves []string // Restrict search to these moves only. Ignore if empty.

	Ponder   bool // Search in pondering mode.
	Infinite bool // Search until interrupted.
	MoveTime int  // If > 0, search for this many milliseconds.

	WhiteTime      int // If > 0, white's remaining time in milliseconds.
	BlackTime      int // If > 0, black's remaining time in milliseconds.
	WhiteIncrement int // If > 0, white's increment in milliseconds.
	BlackIncrement int // If > 0, black's increment in milliseconds.

	Depth     int // If > 0, search this many plies only.
	Nodes     int // If > 0, search this many nodes only.
	Mate      int // If > 0, search for a mate in this many moves.
	MovesToGo int // If > 0, there are this many moves until the next time control.
}

type RequestIsReady struct{}

type RequestPosition struct {
	FEN   string
	Moves []string
}

type RequestUCI struct{}

type Response interface {
	encoding.TextMarshaler
}

type ResponseBestMove struct {
	Move   string
	Ponder string
}

type ResponseID struct {
	Name   string
	Author string
}

type ResponseInfo struct {
	Depth     int      // Search depth in plies.
	PV        []string // Moves in the principal variation.
	Score     int      // Score from the engine's point of view.
	ScoreType string   // Either ScoreTypeCentipawn or ScoreTypeMate.
}