// Copyright 2018 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

const COL_LABELS = 'ABCDEFGHJKLMNOPQRST';

enum Color {

Empty,

Black,

White,

}

function otherColor(color: Color) {

if (color != Color.White && color != Color.Black) {

throw new Error(`invalid color ${color}`);

}

return color == Color.White ? Color.Black : Color.White;

}

enum BoardSize {

Nine = 9,

Nineteen = 19,

}

// Canvas coordinate.

interface Coord {

x: number;

y: number;

}

// Point on the board.

interface Point {

row: number;

col: number;

}

type Move = Point | 'pass' | 'resign';

type Nullable<T> = T | null;

export {

BoardSize,

COL_LABELS,

Color,

Coord,

Move,

Nullable,

Point,

otherColor,

}