/**
 * Manager 注册表
 * 全局单例，提供所有 Manager 的集中访问点
 */
import { EventEmitter } from './event-emitter';
import type { EngineEvents } from '../types/events';

import type { ToolbarManager } from '../managers/toolbar-manager';
import type { DialogManager } from '../managers/dialog-manager';
import type { EngineManager } from '../managers/engine-manager';
import type { ButtonGroupManager } from '../managers/button-group-manager';
import type { RightKeyManager } from '../managers/right-key-manager';
import type { ConstructTreeManagerBtn } from '../managers/construct-tree-manager-btn';
import type { PropertyPanelManager } from '../managers/property-panel-manager';
import type { MeasureDialogManager } from '../managers/measure-dialog-manager';
import type { WalkControlManager } from '../managers/walk-control-manager';
import type { MapDialogManager } from '../managers/map-dialog-manager';
import type { SectionPlaneDialogManager } from '../managers/section-plane-dialog-manager';
import type { SectionAxisDialogManager } from '../managers/section-axis-dialog-manager';
import type { SectionBoxDialogManager } from '../managers/section-box-dialog-manager';
import type { WalkPathDialogManager } from '../managers/walk-path-dialog-manager';
import type { WalkPlanViewDialogManager } from '../managers/walk-plan-view-dialog-manager';
import type { ComponentDetailManager } from '../managers/component-detail-manager';

/**
 * Manager 注册表 - 单例模式
 * 提供所有 Manager 的全局访问点,替代 engine 层层传递
 */
export class ManagerRegistry {
    /** 单例实例 */
    private static instance: ManagerRegistry | null = null;
    /** 事件发射器 */
    private eventEmitter: EventEmitter = new EventEmitter();

    /** 主容器元素 */
    public container: HTMLElement | null = null;
    /** 包装容器元素 */
    public wrapper: HTMLElement | null = null;

    /** 工具栏管理器 */
    public toolbar: ToolbarManager | null = null;
    /** 对话框管理器 */
    public dialog: DialogManager | null = null;
    /** 3D 引擎管理器 */
    public engine3d: EngineManager | null = null;
    /** 按钮组管理器 */
    public buttonGroup: ButtonGroupManager | null = null;
    /** 右键菜单管理器 */
    public rightKey: RightKeyManager | null = null;
    /** 构件树管理器 */
    public constructTree: ConstructTreeManagerBtn | null = null;
    /** 属性面板管理器 */
    public propertyPanel: PropertyPanelManager | null = null;
    /** 测量对话框管理器 */
    public measure: MeasureDialogManager | null = null;
    /** 漫游控制管理器 */
    public walkControl: WalkControlManager | null = null;
    /** 地图对话框管理器 */
    public map: MapDialogManager | null = null;
    /** 拾取面剖切对话框管理器 */
    public sectionPlane: SectionPlaneDialogManager | null = null;
    /** 轴向剖切对话框管理器 */
    public sectionAxis: SectionAxisDialogManager | null = null;
    /** 剖切盒对话框管理器 */
    public sectionBox: SectionBoxDialogManager | null = null;
    /** 漫游路径对话框管理器 */
    public walkPath: WalkPathDialogManager | null = null;
    /** 漫游平面图对话框管理器 */
    public walkPlanView: WalkPlanViewDialogManager | null = null;
    /** 构件详情管理器 */
    public componentDetail: ComponentDetailManager | null = null;

    private constructor() {}

    /** 获取单例实例 */
    public static getInstance(): ManagerRegistry {
        if (!ManagerRegistry.instance) {
            ManagerRegistry.instance = new ManagerRegistry();
        }
        return ManagerRegistry.instance;
    }

    /** 重置单例（用于测试或重新初始化） */
    public static reset(): void {
        if (ManagerRegistry.instance) {
            ManagerRegistry.instance.eventEmitter.clear();
            ManagerRegistry.instance = null;
        }
    }

    /**
     * 发送事件
     * @param event 事件名称
     * @param payload 事件数据
     */
    public emit<K extends keyof EngineEvents>(event: K, payload: EngineEvents[K]): void {
        this.eventEmitter.emit(event, payload);
    }

    /**
     * 订阅事件
     * @param event 事件名称
     * @param listener 事件处理函数
     * @returns 取消订阅的函数
     */
    public on<K extends keyof EngineEvents>(
        event: K,
        listener: (payload: EngineEvents[K]) => void
    ): () => void {
        return this.eventEmitter.on(event, listener);
    }

    /**
     * 取消订阅事件
     * @param event 事件名称
     * @param listener 事件处理函数
     */
    public off<K extends keyof EngineEvents>(
        event: K,
        listener: (payload: EngineEvents[K]) => void
    ): void {
        this.eventEmitter.off(event, listener);
    }

    /** 清除所有事件监听器 */
    public clearEvents(): void {
        this.eventEmitter.clear();
    }
}