เขียนกลยุทธ์พื้นฐานแบล็คแจ็คด้วย JavaScript

// small excerpt (full table would include all rows)
const blackjackStrategy = {
  "5-8": {"2":"H","3":"H","4":"H","5":"H","6":"H","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "9": {"2":"H","3":"D","4":"D","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "10": {"2":"D","3":"D","4":"D","5":"D","6":"D","7":"D","8":"D","9":"D","10":"H","A":"H"},
  "11": {"2":"D","3":"D","4":"D","5":"D","6":"D","7":"D","8":"D","9":"D","10":"D","A":"D"},
  "12": {"2":"H","3":"H","4":"S","5":"S","6":"S","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "13": {"2":"S","3":"S","4":"S","5":"S","6":"S","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "14": {"2":"S","3":"S","4":"S","5":"S","6":"S","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "15": {"2":"S","3":"S","4":"S","5":"S","6":"S","7":"H","8":"H","9":"H","10":"SR","A":"SR"},
  "16": {"2":"S","3":"S","4":"S","5":"S","6":"S","7":"H","8":"H","9":"SR","10":"SR","A":"SR"},
  "A2": {"2":"H","3":"H","4":"H","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "A3": {"2":"H","3":"H","4":"H","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "A4": {"2":"H","3":"H","4":"D","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "A5": {"2":"H","3":"H","4":"D","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "A6": {"2":"H","3":"D","4":"D","5":"D","6":"D","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "A7": {"2":"D/S","3":"D/S","4":"D/S","5":"D/S","6":"D/S","7":"S","8":"S","9":"H","10":"H","A":"H"},
  "2-2": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"P","8":"H","9":"H","10":"H","A":"H"},
  "3-3": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"P","8":"H","9":"H","10":"H","A":"H"},
  "4-4": {"2":"H","3":"H","4":"H","5":"P","6":"P","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "6-6": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"H","8":"H","9":"H","10":"H","A":"H"},
  "7-7": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"P","8":"H","9":"H","10":"H","A":"H"},
  "8-8": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"P","8":"P","9":"P","10":"P","A":"SP"},
  "9-9": {"2":"P","3":"P","4":"P","5":"P","6":"P","7":"S","8":"P","9":"P","10":"S","A":"S"}
};

// ฟังก์ชันค้นหา
function getBlackjackAction(playerHand, dealerCard, strategyTable) {
  if (!strategyTable) strategyTable = blackjackStrategy; // ถ้าไม่ได้ส่งมา ใช้ตัวแปร global แทน
  playerHand  = String(playerHand).toUpperCase();
  dealerCard  = String(dealerCard).toUpperCase();

  const row = strategyTable[playerHand];
  if (!row) return null; // ไม่รู้จักแถวนี้
  return row[dealerCard] || null; // วิธีเล่น หรือ null ถ้าไม่รู้จักไพ่เจ้ามือ
}

// ตัวอย่าง
console.log(getBlackjackAction("A7", "6"));   // "D/S"
console.log(getBlackjackAction("16", "10"));  // "SR"
console.log(getBlackjackAction("9-9", "7"));  // "S"

// ตัวอย่างฟังก์ชันแปลงมือ (แบบสั้นมาก)
function normalizeHand(cards) {
  // cards: อาร์เรย์ของค่าไพ่ เช่น ['A','6'] หรือ ['9','9'] หรือ ['10','6']
  const ranks = cards.map(c => String(c).toUpperCase());
  if (ranks.length === 2 && ranks[0] === ranks[1]) {
    // ไพ่คู่
    return `${ranks[0]}-${ranks[1]}`;
  }
  const hasAce = ranks.includes('A');
  const numeric = ranks.reduce((sum, r) => sum + (r === 'A' ? 11 : (r === 'J' || r === 'Q' || r === 'K' ? 10 : parseInt(r,10) || 0)), 0);
  // ตรวจแต้มอ่อนแบบง่าย ๆ สำหรับมือสองใบ
  if (hasAce && ranks.length === 2) {
    const other = ranks.find(r => r !== 'A');
    return `A${other}`;
  }
  return String(numeric);
}