/* Javaの三目並べゲーム */
package com.mcnz.tictactoe;

public class TicTacToe {

  public static void main(String[] args) {

    char[] board = { '1', '2', '3',
                     '4', '5', '6',
                     '7', '8', '9' };

    var numberOfSquaresPlayed = 0;
    var whoseTurnItIs = 'x';
    var gameEndingMessage = "";

    while (numberOfSquaresPlayed < 9) {
      printTheBoard(board);
      getTheUserToSelectTheirSquare(board, whoseTurnItIs);

      if (theyWonTheGame(board, whoseTurnItIs)) {
        gameEndingMessage = "あなたの勝ちです！　おめでとう！";
        break;
      } else if (numberOfSquaresPlayed == 9) {
        gameEndingMessage = "引き分け！　お疲れさまでした。";
      } else {
        numberOfSquaresPlayed++;
        whoseTurnItIs = (whoseTurnItIs == 'x') ? 'o' : 'x';
        continue;
      }
    }
    printTheBoard(board);
    System.out.println(gameEndingMessage);
  }

  private static void printTheBoard(char[] board) {
    System.out.printf("%n %s | %s | %s %n", board[0], board[1], board[2]);
    System.out.println(" - + - + - ");
    System.out.printf(" %s | %s | %s %n",   board[3], board[4], board[5]);
    System.out.println(" - + - + - ");
    System.out.printf(" %s | %s | %s %n%n", board[6], board[7], board[8]);
  }

  private static void getTheUserToSelectTheirSquare(char[] board, char whoseTurnItIs) {

    do {
      try {
        System.out.printf("記号%sのプレイヤーのターンです。マスを選んでください：, whoseTurnItIs);
        var scanner = new java.util.Scanner(System.in);
        var input = scanner.nextInt();
        if (Character.isDigit(board[input - 1])) {
          board[input - 1] = whoseTurnItIs;
          break;
        } else {
          System.out.println("そのマスは選択済みです。");
        }
      } catch (Exception e) {
        System.out.println("入力が誤っています。正しい数値を入力してください。");
      }
      printTheBoard(board);
    } while (true);
  }

  private static boolean theyWonTheGame(char[] board, char whoseTurnItIs) {
    return (board[0] + board[1] + board[2] == (whoseTurnItIs * 3)) // 1行目
    || (board[3] + board[4] + board[5] == (whoseTurnItIs * 3))     // 2行目
    || (board[6] + board[7] + board[8] == (whoseTurnItIs * 3))     // 3行目
    || (board[0] + board[3] + board[6] == (whoseTurnItIs * 3))     // 1列目
    || (board[1] + board[4] + board[7] == (whoseTurnItIs * 3))     // 2列目
    || (board[2] + board[5] + board[8] == (whoseTurnItIs * 3))     // 3列目
    || (board[0] + board[4] + board[8] == (whoseTurnItIs * 3))     // 左上から右下への斜めライン
    || (board[2] + board[4] + board[6] == (whoseTurnItIs * 3));    // 右上から左下への斜めライン
  }
}