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import { RouteReuseStrategy, DefaultUrlSerializer, ActivatedRouteSnapshot, DetachedRouteHandle, Route } from '@angular/router';
import { ComponentRef } from '@angular/core';
 
export class SimpleReuseStrategy implements RouteReuseStrategy {
 
  public static handlers: Map<Route, DetachedRouteHandle> = new Map();
 
  private getRouteUrl(route?: ActivatedRouteSnapshot | any) {
    return route['_routerState'].url.replace(/[\/, -]/g, '_')
  }
 
  public shouldDetach(_route: ActivatedRouteSnapshot): boolean {
    return true;
  }
 
  /** 当路由离开时会触发。按path作为key存储路由快照&组件当前实例对象 */
  public store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
    if (!route.routeConfig) return;
    SimpleReuseStrategy.handlers.set(route.routeConfig, handle);
  }
 
  /** 若 path 在缓存中有的都认为允许还原路由 */
  public shouldAttach(route: ActivatedRouteSnapshot): boolean {
    return !!route.routeConfig && !!SimpleReuseStrategy.handlers.get(route.routeConfig);
  }
 
  /** 从缓存中获取快照，若无则返回nul */
  public retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null {
    if (!route.routeConfig || !SimpleReuseStrategy.handlers.has(route.routeConfig)) return null;
    return SimpleReuseStrategy.handlers.get(route.routeConfig)!;
  }
 
  /** 进入路由触发，判断是否同一路由 */
  public shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
    return future.routeConfig === curr.routeConfig;
  }
 
  /** 清除缓存 */
  public clearCacheHandle() {
    SimpleReuseStrategy.handlers.forEach(item => {
      this.deactivateOutlet(item);
    });
  }
 
  /** 处理同一组件不同链接的问题 */
  private deactivateOutlet(handle?: DetachedRouteHandle | any): void | null {
    const componentRef: ComponentRef<any> = handle ? handle['componentRef'] : null;
    if (componentRef) {
      componentRef.destroy();
    }
  }
  /**
   * 清除单个路由
   * @param url
   */
  public clearCacheByUrl(url: string) {
    var route = url.substring(url.lastIndexOf('/') + 1);
    SimpleReuseStrategy.handlers.forEach((value: DetachedRouteHandle, key: Route) => {
      if (route == key.path) {
        SimpleReuseStrategy.handlers.delete(key);
      }
    });
  }
 
  /**清除所有 */
  public clearCacheAll() {
    console.log("clearCacheAll");
    SimpleReuseStrategy.handlers.clear();
  }
 
  /**保留一个 */
  public clearCacheLeftOne(url: string) {
    console.log("clearCacheLeftOne");
    var route = url.substring(url.lastIndexOf('/') + 1);
    SimpleReuseStrategy.handlers.forEach((value: DetachedRouteHandle, key: Route) => {
      if (route!= key.path) {
        SimpleReuseStrategy.handlers.delete(key);
      }
    });
  }
 
  /**
  * 清除多个
  * @param url
  */
  public clearCacheByUrls(urlAry: Array<string>) {
    console.log("clearCacheByUrls");
    if (urlAry && urlAry.length > 0) {
      let handleUrlAry: Array<string> = [];
      urlAry.forEach(url => {
        const handleUrl = url.substring(url.lastIndexOf('/') + 1);
        handleUrlAry.push(handleUrl);
      });
      SimpleReuseStrategy.handlers.forEach((value: DetachedRouteHandle, key: Route) => {
        if (key.path&&handleUrlAry.indexOf(key.path)>-1) {
          SimpleReuseStrategy.handlers.delete(key);
        }
      });
    }
  }
}