/* This file is a part of othello-ai-guile-c
 *
 * Copyright (C) 2021  Robby Zambito
 *
 * othello-ai-guile-c 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.
 *
 * othello-ai-guile-c 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#define _GNU_SOURCE

#include <stdio.h>

#include <errno.h>
#include <libguile.h>
#include <readline/history.h>
#include <readline/readline.h>
#include <stdlib.h>
#include <string.h>

#include "othello.h"
#include "othello_move.h"

#define STREQ(a, b) (strcmp(a, b) == 0)

static enum player_color current_player;

enum player_color get_current_player(void) { return current_player; }

struct move (*player_one_get_move)();
struct move (*player_two_get_move)();

static struct move current_player_move(enum player_color current_player,
                                       char *player_one_strategy_path,
                                       char *player_two_strategy_path) {
  struct move move = {-1, -1};

  if ((current_player == WHITE && player_one_strategy_path == NULL) ||
      (current_player == BLACK && player_two_strategy_path == NULL)) {
    move = prompt_get_move(current_player);
  } else if (current_player == WHITE) {
    move = get_scm_move(player_one_strategy_path);
  } else if (current_player == BLACK) {
    move = get_scm_move(player_two_strategy_path);
  }

  return move;
}

enum player_color game_loop(char *player_one_strategy_path,
                            char *player_two_strategy_path) {
  initialize_board();

  if (player_one_strategy_path == NULL || player_two_strategy_path == NULL) {
    using_history();
  }

  current_player = WHITE;
#define other_player (current_player == WHITE ? BLACK : WHITE)

  while (has_valid_moves(current_player)) {
    struct move move = current_player_move(current_player, player_one_strategy_path,
                                           player_two_strategy_path);
    if (apply_move(get_board(), current_player, move)) {
      current_player = other_player;
    }
  }

#undef other_player

  if (player_one_strategy_path == NULL || player_two_strategy_path == NULL) {
    rl_clear_history();
  }

  return get_winner();
}