/**
 * 导航服务层
 * 提供全局导航功能，解耦组件与导航状态的直接依赖
 */

import { NavigationContainerRef, Route } from '@react-navigation/native';

class NavigationService {
  private navigationRef: NavigationContainerRef<any> | null = null;
  private isReady: boolean = false;

  /**
   * 设置导航引用
   */
  setNavigationRef(ref: NavigationContainerRef<any> | null): void {
    this.navigationRef = ref;
    this.isReady = ref !== null;
  }

  /**
   * 检查导航是否就绪
   */
  isNavigationReady(): boolean {
    return this.isReady && this.navigationRef !== null;
  }

  /**
   * 导航到指定路由
   */
  navigate(routeName: string, params?: any): void {
    if (!this.isNavigationReady()) {
      console.warn('[NavigationService] Navigation not ready');
      return;
    }
    this.navigationRef!.navigate(routeName as any, params);
  }

  /**
   * 返回上一页
   */
  goBack(): void {
    if (!this.isNavigationReady()) {
      console.warn('[NavigationService] Navigation not ready');
      return;
    }
    this.navigationRef!.goBack();
  }

  /**
   * 获取当前路由
   */
  getCurrentRoute(): Route<string> | null {
    if (!this.isNavigationReady()) {
      return null;
    }
    return this.navigationRef!.getCurrentRoute();
  }

  /**
   * 获取当前路由名称
   */
  getCurrentRouteName(): string | null {
    const route = this.getCurrentRoute();
    return route?.name ?? null;
  }

  /**
   * 重置导航到指定路由
   */
  reset(routes: { name: string; params?: any }[], index: number = 0): void {
    if (!this.isNavigationReady()) {
      console.warn('[NavigationService] Navigation not ready');
      return;
    }
    this.navigationRef!.reset({
      index,
      routes: routes.map(r => ({ name: r.name, params: r.params })),
    });
  }

  /**
   * 替换当前路由
   */
  replace(routeName: string, params?: any): void {
    if (!this.isNavigationReady()) {
      console.warn('[NavigationService] Navigation not ready');
      return;
    }
    this.navigationRef!.dispatch({
      type: 'REPLACE',
      payload: { name: routeName, params },
    });
  }

  /**
   * 导航到根路由
   */
  navigateToRoot(): void {
    this.reset([{ name: 'Main' }]);
  }

  /**
   * 导航到认证页面
   */
  navigateToAuth(): void {
    this.reset([{ name: 'Auth' }]);
  }
}

export const navigationService = new NavigationService();