import { IGameContext } from "@/core/game";
import { RegicideState } from "@/samples/regicide/state";
import {
  buildEnemyDeck,
  buildTavernDeck,
  createAllCards,
  getPlayerHandRegionId,
} from "@/samples/regicide/utils";
import { INITIAL_HAND_SIZE } from "@/samples/regicide/constants";
import { Enemy, PlayerType, RegicideCard } from "@/samples/regicide/types";
import { checkEnemy, nextTurn, pass, playWithA } from "./commands";
import { enemyCounterattackCmd, playCmd } from ".";

export type RegicideGame = IGameContext<RegicideState>;

/**
 * 初始化游戏设置
 * @param game 游戏上下文
 * @param playerCount 玩家数量（1-4）
 * @param seed 随机种子（可选）
 */
export async function setupGame(
  game: RegicideGame,
  playerCount: number,
  seed?: number,
) {
  if (playerCount < 1 || playerCount > 4) {
    throw new Error("玩家数量必须为 1-4 人");
  }

  if (seed) {
    // RNG seeding handled by game context
  }

  // 创建所有卡牌
  const allCards = createAllCards();

  // 构建敌人牌堆（J/Q/K）
  const enemyDeck = buildEnemyDeck(game._rng);

  // 构建酒馆牌堆（A-10）
  const tavernDeck = buildTavernDeck(game._rng);

  // 初始化游戏状态
  await game.produceAsync((state) => {
    state.cards = allCards;
    state.playerCount = playerCount;
    state.currentPlayerIndex = 0;
    state.enemyDeck = enemyDeck;

    // 设置酒馆牌堆区域
    for (const card of tavernDeck) {
      card.regionId = "tavernDeck";
      state.regions.tavernDeck.childIds.push(card.id);
    }

    // 设置敌人牌堆区域（只存储ID，敌人是独立对象）
    state.regions.enemyDeck.childIds = enemyDeck.map((e) => e.id);

    // 给每个玩家发牌
    const players: PlayerType[] = ["player1", "player2", "player3", "player4"];
    for (let i = 0; i < playerCount; i++) {
      const player = players[i];
      const regionId = getPlayerHandRegionId(player);

      for (let j = 0; j < INITIAL_HAND_SIZE; j++) {
        if (tavernDeck.length === 0) break;
        const card = tavernDeck.shift()!;
        card.regionId = regionId;
        state.playerHands[player].push(card.id);
        const region = state.regions[regionId as keyof typeof state.regions];
        region.childIds.push(card.id);
      }
    }

    // 翻开第一个敌人
    if (enemyDeck.length > 0) {
      const firstEnemy = enemyDeck.shift()!;
      state.currentEnemy = firstEnemy;
    }
  });
}

/**
 * 启动游戏主循环
 */
export async function start(game: RegicideGame) {
  const state = game.value;

  // 检查游戏是否已设置
  if (!state.currentEnemy) {
    throw new Error("请先调用 setupGame 初始化游戏");
  }

  const players: PlayerType[] = ["player1", "player2", "player3", "player4"];

  // 主游戏循环
  while (state.phase === "playing") {
    const currentPlayerIndex = state.currentPlayerIndex;
    const currentPlayer = players[currentPlayerIndex];

    // 检查当前玩家是否有手牌
    const currentHand = state.playerHands[currentPlayer];
    if (currentHand.length === 0) {
      // 玩家没有手牌，跳过回合
      await game.produceAsync((state) => {
        state.currentPlayerIndex =
          (state.currentPlayerIndex + 1) % state.playerCount;
      });
      continue;
    }

    // 等待玩家输入（出牌或让过）
    // 这里需要外部通过 prompt 系统获取输入
    // 实际使用时由 UI 或测试代码提供输入

    // 循环会在外部调用 play/pass 命令后继续
    // 当 phase 变为 'victory' 或 'defeat' 时退出
    break;
  }

  return game.value;
}

/**
 * 处理完整的玩家回合
 */
export async function playTurn(
  game: RegicideGame,
  player: PlayerType,
  action: "play" | "pass",
  cardId?: string,
  secondCardId?: string,
) {
  const state = game.value;

  if (state.phase !== "playing") {
    return { success: false, error: "游戏已结束" };
  }

  if (!state.currentEnemy) {
    return { success: false, error: "没有活跃的敌人" };
  }

  let playResult: any;

  // 执行玩家动作
  if (action === "play" && cardId) {
    // 检查是否是A配合另一张牌
    const card = state.cards[cardId];
    if (card.rank === "A" && secondCardId) {
      playResult = await playWithA(game, player, cardId, secondCardId);
    } else {
      playResult = await playCmd(game, player, cardId);
    }
  } else {
    // 让过
    playResult = await pass(game, player);
  }

  if (!playResult.success) {
    return playResult;
  }

  // 检查敌人是否被击败
  const checkResult = await checkEnemy(game);
  if (!checkResult.success) {
    return checkResult;
  }

  // 如果敌人未被击败，处理反击
  if (!checkResult.result.defeated) {
    // 反击逻辑需要玩家选择弃牌，这里返回状态让外部处理
    return {
      success: true,
      result: {
        playResult: playResult.result,
        enemyDefeated: false,
        needsDiscard: true,
        enemyAttack: state.currentEnemy.value,
        playerHand: state.playerHands[player],
      },
    };
  }

  // 敌人被击败，检查是否还有更多敌人
  if (
    state.enemyDeck.length === 0 &&
    state.currentEnemy &&
    state.currentEnemy.hp <= 0
  ) {
    await game.produceAsync((state) => {
      state.phase = "victory";
      state.winner = true;
    });
    return {
      success: true,
      result: {
        playResult: playResult.result,
        enemyDefeated: true,
        gameWon: true,
      },
    };
  }

  // 切换到下一个玩家
  await nextTurn(game);

  return {
    success: true,
    result: {
      playResult: playResult.result,
      enemyDefeated: true,
      nextEnemy: state.currentEnemy,
    },
  };
}

/**
 * 处理反击阶段的弃牌
 */
export async function handleCounterattack(
  game: RegicideGame,
  player: PlayerType,
  discardCardIds: string[],
) {
  const result = await enemyCounterattackCmd(game, player, discardCardIds);
  if (!result.success) {
    // 弃牌失败（点数和不足），游戏失败
    await game.produceAsync((state) => {
      state.phase = "defeat";
      state.winner = false;
    });
    return result;
  }

  // 弃牌成功，切换到下一个玩家
  await nextTurn(game);

  return result;
}

/**
 * 获取当前游戏状态摘要
 */
export function getGameStatus(game: RegicideGame) {
  const state = game.value;

  return {
    phase: state.phase,
    currentPlayer: ["player1", "player2", "player3", "player4"][
      state.currentPlayerIndex
    ],
    currentEnemy: state.currentEnemy
      ? {
          ...state.currentEnemy,
          hpPercent: Math.round(
            (state.currentEnemy.hp / state.currentEnemy.maxHp) * 100,
          ),
        }
      : null,
    enemiesRemaining: state.enemyDeck.length,
    tavernDeckCount: state.regions.tavernDeck.childIds.length,
    discardPileCount: state.regions.discardPile.childIds.length,
    playerHands: Object.fromEntries(
      Object.entries(state.playerHands).map(([player, hand]) => [
        player,
        hand.length,
      ]),
    ),
    winner: state.winner,
  };
}