/*
  This file is part of ctak.

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with ctak. If not, see <https://www.gnu.org/licenses/>.
*/

#include "pv.h"

#ifdef RECORD_PV

#include "nn.h"

static pv_leaf_t published_leaf;

static float terminal_value(const enum WIN_TYPE winner) {
  switch (winner) {
  case WIN_FLAT_BLACK:
  case WIN_ROAD_BLACK:
    return 1.0f;
  case WIN_FLAT_WHITE:
  case WIN_ROAD_WHITE:
    return -1.0f;
  default:
    return 0.0f;
  }
}

void pv_capture_leaf(pv_leaf_t *leaf, tak_state_p state,
                     const enum WIN_TYPE winner) {
  nn_prepare_head(leaf->head, state);
  nn_cell_idxs(leaf->cells, state);
  const uint8_t n_cells = state->board_size * state->board_size;
  for (uint8_t loc = n_cells; loc < PV_MAX_CELLS; loc++)
    leaf->cells[loc] = 0;
  leaf->current_colour = (uint8_t)state->current_colour;
  leaf->terminal = (uint8_t)(winner < 0xFF);
  leaf->terminal_value = leaf->terminal ? terminal_value(winner) : 0.0f;
}

void pv_publish_leaf(const pv_leaf_t *leaf) { published_leaf = *leaf; }

const pv_leaf_t *pv_get_leaf(void) { return &published_leaf; }

#else

typedef int pv_disabled_translation_unit;

#endif