import { _decorator, Component, Node } from 'cc';
import type { PlayerState } from '../framework/platform/stores/types.ts';
import { computeActiveFlags, computePositions, type SeatLayout } from './room-scene-layout.ts';

export { computeActiveFlags, computePositions };
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)。
 *
 * 纯函数算法(computeActiveFlags / computePositions)放在 room-scene-layout.ts,
 * 本文件只 re-export — 这样单元测试可以直接 import 布局函数而无需 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}`,
      );
    }
    this.setPlayerCount(this.currentCount);
    this.setSeatLayout(this.currentLayout);
  }

  public setPlayerCount(n: number): void {
    if (n < 1 || n > this.playerSlots.length) {
      throw new Error(
        `[RoomSceneStart] setPlayerCount: n must be 1-${this.playerSlots.length}, got ${n}`,
      );
    }
    this.currentCount = n;
    const flags = computeActiveFlags(n, this.playerSlots.length);
    for (let i = 0; i < this.playerSlots.length; i++) {
      const slot = this.playerSlots[i];
      if (slot) slot.active = flags[i];
    }
  }

  public setSeatLayout(layout: SeatLayout): void {
    this.currentLayout = layout;
    const positions = computePositions(layout, this.currentCount);
    for (let i = 0; i < this.currentCount && i < positions.length; i++) {
      const slot = this.playerSlots[i];
      if (slot) slot.setPosition(positions[i].x, positions[i].y, 0);
    }
  }

  public setPlayerData(seat: number, data: PlayerState): void {
    if (seat < 1 || seat > this.currentCount) {
      throw new Error(
        `[RoomSceneStart] setPlayerData: seat ${seat} out of range 1-${this.currentCount}`,
      );
    }
    const slot = this.playerSlots[seat - 1];
    if (!slot) return;
    const view = slot.getComponent('PlayerInfoView') as any;
    if (view && typeof view.bindTo === 'function') {
      view.bindTo({ player: { state: { value: data } } });
    }
  }

  public clearSeats(): void {
    const placeholder: PlayerState = {
      playerid: 0,
      nickname: '占位',
      avatar: '',
      sex: 0,
      bean: 0,
      roomcard: 0,
      score: 0,
      charm: 0,
      taskstate: 0,
      advanced: 0,
      bankpower: 0,
      bank: 0,
      bankpwd: 0,
      ip: '',
      sign: null,
      tel: null,
      invitecode: null,
      initCard: 0,
      initBean: 0,
    };
    for (let i = 0; i < this.currentCount; i++) {
      this.setPlayerData(i + 1, placeholder);
    }
  }
}