import { _decorator, Component, Node } from 'cc';
import type { PlayerState } from '../framework/platform/stores/types.ts';
import {
  applyPlayerCount,
  applyPlayerData,
  applySeatLayoutPositions,
  clearSlots,
  computeActiveFlags,
  computePositions,
  type PlayerSlotLike,
  type SeatLayout,
  validateCount,
  validateLayout,
  validateSeat,
} from './room-scene-controller.ts';

export {
  applyPlayerCount,
  applyPlayerData,
  applySeatLayoutPositions,
  clearSlots,
  computeActiveFlags,
  computePositions,
  validateCount,
  validateLayout,
  validateSeat,
  type PlayerSlotLike,
};
export type { SeatLayout };

const { ccclass, property } = _decorator;

/**
 * RoomSceneStart: 房间场景控制脚本。
 *
 * 工作流:
 * 1. 子游戏初始化 → setPlayerCount(n) + setSeatLayout(layout) 调整可见槽位与位置
 * 2. 子游戏收到玩家状态变更 → setPlayerData(seat, data) 注入到对应槽位的 PlayerInfoView
 * 3. 子游戏重置房间 → clearSeats() 把当前可见槽位刷成占位数据
 *
 * 8 个 playerSlots 在场景里预先挂好(Plan Task 2 负责),setPlayerCount 只切 active,
 * 不运行时 instantiate 节点(避免预制重复实例化开销)。
 *
 * 纯逻辑(校验 + 槽位操作 + 视图交互)放在 room-scene-controller.ts(同目录),
 * 本文件只 re-export 并做 cc 包装 — 这样单元测试可以直接 import 控制器函数
 * 而无需 mock cc 模块(CLAUDE.md 第二准则:RoomSceneStart 的下游消费者不应被 cc 依赖拖累)。
 */
@ccclass('RoomSceneStart')
export class RoomSceneStart extends Component {
  @property([Node])
  playerSlots: Node[] = [];

  private currentCount: number = 4;
  private currentLayout: SeatLayout = 'horizontal';

  start(): void {
    if (!this.playerSlots || this.playerSlots.length !== 8) {
      throw new Error(
        `[RoomSceneStart] playerSlots must have 8 entries, got ${this.playerSlots?.length}`,
      );
    }
    // 校验 playerSlots 内是否有 null/undefined;start 时显式 throw,不兜底。
    for (let i = 0; i < this.playerSlots.length; i++) {
      if (!this.playerSlots[i]) {
        throw new Error(`[RoomSceneStart] playerSlots[${i}] is null/undefined`);
      }
    }
    this.setPlayerCount(this.currentCount);
    this.setSeatLayout(this.currentLayout);
  }

  public setPlayerCount(n: number): void {
    validateCount(n);
    this.currentCount = n;
    applyPlayerCount(this.playerSlots as unknown as PlayerSlotLike[], n);
  }

  public setSeatLayout(layout: SeatLayout): void {
    validateLayout(layout);
    this.currentLayout = layout;
    applySeatLayoutPositions(
      this.playerSlots as unknown as PlayerSlotLike[],
      layout,
      this.currentCount,
    );
  }

  public setPlayerData(seat: number, data: PlayerState): void {
    applyPlayerData(
      this.playerSlots as unknown as PlayerSlotLike[],
      seat,
      this.currentCount,
      data as unknown as { nickname?: unknown; bean?: unknown; avatar?: unknown },
    );
  }

  public clearSeats(): void {
    clearSlots(this.playerSlots as unknown as PlayerSlotLike[], this.currentCount);
  }
}