// 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.

#ifndef CC_ZOBRIST_H_

#define CC_ZOBRIST_H_

#include <algorithm>

#include <array>

#include <cstdint>

#include "cc/color.h"

#include "cc/constants.h"

#include "cc/coord.h"

namespace minigo {

namespace zobrist {

using Hash = uint64_t;

extern Hash kBlackToPlayHash;

extern std::array<std::array<Hash, 3>, kNumMoves> kMoveHashes;

extern std::array<Hash, kN * kN> kKoHashes;

inline Hash ToPlayHash(Color color) {

return color == Color::kBlack ? kBlackToPlayHash : 0;

}

inline Hash MoveHash(Coord c, Color color) {

return kMoveHashes[c][static_cast<int>(color)];

}

inline Hash KoHash(Coord c) { return c == Coord::kInvalid ? 0 : kKoHashes[c]; }

void Init(uint64_t seed);

} // namespace zobrist

} // namespace minigo

#endif // CC_ZOBRIST_H_