"use server";

import crypto from "crypto";
import {
  createDeck,
  shuffle,
  calculateHand,
  type Card,
} from "~/lib/blackjack/engine";

// In-memory storage (replace with DB/Redis in production)
const games = new Map<string, any>();

export async function startGame(bet: number) {
  const deck = shuffle(createDeck());

  const player: Card[] = [deck.pop()!, deck.pop()!];
  const dealer: Card[] = [deck.pop()!, deck.pop()!];

  const gameId = crypto.randomUUID();

  games.set(gameId, { deck, player, dealer, bet, status: "playing" });

  return {
    gameId,
    player,
    dealerUpcard: [dealer[0]],
    playerTotal: calculateHand(player),
    status: "playing",
  };
}

export async function hit(gameId: string) {
  const game = games.get(gameId);
  if (!game) throw new Error("Game not found");

  const card = game.deck.pop();
  game.player.push(card);

  const playerTotal = calculateHand(game.player);
  if (playerTotal > 21) game.status = "bust";

  return {
    player: game.player,
    playerTotal,
    status: game.status,
  };
}

export async function stand(gameId: string) {
  const game = games.get(gameId);
  if (!game) throw new Error("Game not found");

  while (calculateHand(game.dealer) < 17) {
    game.dealer.push(game.deck.pop());
  }

  const playerTotal = calculateHand(game.player);
  const dealerTotal = calculateHand(game.dealer);

  let result: "win" | "lose" | "push" = "lose";
  if (dealerTotal > 21 || playerTotal > dealerTotal) result = "win";
  if (playerTotal === dealerTotal) result = "push";

  // TODO: update user balance here

  games.delete(gameId);

  return {
    dealer: game.dealer,
    dealerTotal,
    result,
  };
}

export async function revealDealer(gameId: string) {
  const game = games.get(gameId);
  if (!game) throw new Error("Game not found");

  return {
    dealer: game.dealer,
    dealerTotal: calculateHand(game.dealer),
  };
}