// 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_COORD_H_

#define CC_COORD_H_

#include <cstdint>

#include <ostream>

#include <string>

#include "absl/strings/string_view.h"

#include "cc/constants.h"

#include "cc/logging.h"

namespace minigo {

// Coord represents the coordinates of a point on the board, a pass, or a

// resign.

class Coord {

public:

static constexpr uint16_t kPass = kN * kN;

static constexpr uint16_t kResign = kPass + 1;

static constexpr uint16_t kInvalid = 0xffff;

static const char kGtpColumns[20];

Coord() = default;

Coord(uint16_t value) : value_(value) {} // NOLINT(runtime/explicit)

Coord(int row, int col) {

MG_DCHECK(row >= 0 && row < kN);

MG_DCHECK(col >= 0 && col < kN);

value_ = row * kN + col;

}

// Parse a Coord from a GTP string.

static Coord FromGtp(absl::string_view str, bool allow_invalid = false);

// Parse a Coord from a SGF string.

static Coord FromSgf(absl::string_view str, bool allow_invalid = false);

// Parse a Coord from one of the above string representations.

static Coord FromString(absl::string_view str, bool allow_invalid = false);

// Format the Coord as a GTP string.

std::string ToGtp() const;

// Format the Coord as an SGF string.

std::string ToSgf() const;

operator uint16_t() const { return value_; }

// Enable Coords to be used as keys in absl hashed containers.

template <typename H>

friend H AbslHashValue(H h, Coord c) {

return H::combine(std::move(h), c.value_);

}

private:

uint16_t value_ = kInvalid;

};

// Formats the coord as a GTP string.

std::ostream& operator<<(std::ostream& os, Coord c);

} // namespace minigo

#endif // CC_COORD_H_