/**
*@license
*Copyright Google Inc. All Rights Reserved.
*
*Use of this source code is governed by an MIT-style license that can be
*found in the LICENSE file at https://angular.io/license
*/
import { __decorate, __metadata, __values } from "tslib";
import { Compiler, Injectable, Injector, NgModuleFactoryLoader, NgModuleRef } from '@angular/core';
import { from, of } from 'rxjs';
import { catchError, concatMap, filter, map, mergeAll, mergeMap } from 'rxjs/operators';
import { NavigationEnd, RouteConfigLoadEnd, RouteConfigLoadStart } from './events';
import { Router } from './router';
import { RouterConfigLoader } from './router_config_loader';
/**
 * @description
 *
 * Provides a preloading strategy.
 *
 * @publicApi
 */
var PreloadingStrategy = /** @class */ (function () {
    function PreloadingStrategy() {
    }
    return PreloadingStrategy;
}());
export { PreloadingStrategy };
/**
 * @description
 *
 * Provides a preloading strategy that preloads all modules as quickly as possible.
 *
 * ```
 * RouteModule.forRoot(ROUTES, {preloadingStrategy: PreloadAllModules})
 * ```
 *
 * @publicApi
 */
var PreloadAllModules = /** @class */ (function () {
    function PreloadAllModules() {
    }
    PreloadAllModules.prototype.preload = function (route, fn) {
        return fn().pipe(catchError(function () { return of(null); }));
    };
    return PreloadAllModules;
}());
export { PreloadAllModules };
/**
 * @description
 *
 * Provides a preloading strategy that does not preload any modules.
 *
 * This strategy is enabled by default.
 *
 * @publicApi
 */
var NoPreloading = /** @class */ (function () {
    function NoPreloading() {
    }
    NoPreloading.prototype.preload = function (route, fn) { return of(null); };
    return NoPreloading;
}());
export { NoPreloading };
/**
 * The preloader optimistically loads all router configurations to
 * make navigations into lazily-loaded sections of the application faster.
 *
 * The preloader runs in the background. When the router bootstraps, the preloader
 * starts listening to all navigation events. After every such event, the preloader
 * will check if any configurations can be loaded lazily.
 *
 * If a route is protected by `canLoad` guards, the preloaded will not load it.
 *
 * @publicApi
 */
var RouterPreloader = /** @class */ (function () {
    function RouterPreloader(router, moduleLoader, compiler, injector, preloadingStrategy) {
        this.router = router;
        this.injector = injector;
        this.preloadingStrategy = preloadingStrategy;
        var onStartLoad = function (r) { return router.triggerEvent(new RouteConfigLoadStart(r)); };
        var onEndLoad = function (r) { return router.triggerEvent(new RouteConfigLoadEnd(r)); };
        this.loader = new RouterConfigLoader(moduleLoader, compiler, onStartLoad, onEndLoad);
    }
    RouterPreloader.prototype.setUpPreloading = function () {
        var _this = this;
        this.subscription =
            this.router.events
                .pipe(filter(function (e) { return e instanceof NavigationEnd; }), concatMap(function () { return _this.preload(); }))
                .subscribe(function () { });
    };
    RouterPreloader.prototype.preload = function () {
        var ngModule = this.injector.get(NgModuleRef);
        return this.processRoutes(ngModule, this.router.config);
    };
    // TODO(jasonaden): This class relies on code external to the class to call setUpPreloading. If
    // this hasn't been done, ngOnDestroy will fail as this.subscription will be undefined. This
    // should be refactored.
    RouterPreloader.prototype.ngOnDestroy = function () { this.subscription.unsubscribe(); };
    RouterPreloader.prototype.processRoutes = function (ngModule, routes) {
        var e_1, _a;
        var res = [];
        try {
            for (var routes_1 = __values(routes), routes_1_1 = routes_1.next(); !routes_1_1.done; routes_1_1 = routes_1.next()) {
                var route = routes_1_1.value;
                // we already have the config loaded, just recurse
                if (route.loadChildren && !route.canLoad && route._loadedConfig) {
                    var childConfig = route._loadedConfig;
                    res.push(this.processRoutes(childConfig.module, childConfig.routes));
                    // no config loaded, fetch the config
                }
                else if (route.loadChildren && !route.canLoad) {
                    res.push(this.preloadConfig(ngModule, route));
                    // recurse into children
                }
                else if (route.children) {
                    res.push(this.processRoutes(ngModule, route.children));
                }
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (routes_1_1 && !routes_1_1.done && (_a = routes_1.return)) _a.call(routes_1);
            }
            finally { if (e_1) throw e_1.error; }
        }
        return from(res).pipe(mergeAll(), map(function (_) { return void 0; }));
    };
    RouterPreloader.prototype.preloadConfig = function (ngModule, route) {
        var _this = this;
        return this.preloadingStrategy.preload(route, function () {
            var loaded$ = _this.loader.load(ngModule.injector, route);
            return loaded$.pipe(mergeMap(function (config) {
                route._loadedConfig = config;
                return _this.processRoutes(config.module, config.routes);
            }));
        });
    };
    RouterPreloader = __decorate([
        Injectable(),
        __metadata("design:paramtypes", [Router, NgModuleFactoryLoader, Compiler,
            Injector, PreloadingStrategy])
    ], RouterPreloader);
    return RouterPreloader;
}());
export { RouterPreloader };
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All Rights Reserved.\n*\n*Use of this source code is governed by an MIT-style license that can be\n*found in the LICENSE file at https://angular.io/license\n*/\n\nimport {Compiler, Injectable, Injector, NgModuleFactoryLoader, NgModuleRef, OnDestroy} from '@angular/core';\nimport {Observable, Subscription, from, of } from 'rxjs';\nimport {catchError, concatMap, filter, map, mergeAll, mergeMap} from 'rxjs/operators';\n\nimport {LoadedRouterConfig, Route, Routes} from './config';\nimport {Event, NavigationEnd, RouteConfigLoadEnd, RouteConfigLoadStart} from './events';\nimport {Router} from './router';\nimport {RouterConfigLoader} from './router_config_loader';\n\n\n/**\n * @description\n *\n * Provides a preloading strategy.\n *\n * @publicApi\n */\nexport abstract class PreloadingStrategy {\n  abstract preload(route: Route, fn: () => Observable<any>): Observable<any>;\n}\n\n/**\n * @description\n *\n * Provides a preloading strategy that preloads all modules as quickly as possible.\n *\n * ```\n * RouteModule.forRoot(ROUTES, {preloadingStrategy: PreloadAllModules})\n * ```\n *\n * @publicApi\n */\nexport class PreloadAllModules implements PreloadingStrategy {\n  preload(route: Route, fn: () => Observable<any>): Observable<any> {\n    return fn().pipe(catchError(() => of (null)));\n  }\n}\n\n/**\n * @description\n *\n * Provides a preloading strategy that does not preload any modules.\n *\n * This strategy is enabled by default.\n *\n * @publicApi\n */\nexport class NoPreloading implements PreloadingStrategy {\n  preload(route: Route, fn: () => Observable<any>): Observable<any> { return of (null); }\n}\n\n/**\n * The preloader optimistically loads all router configurations to\n * make navigations into lazily-loaded sections of the application faster.\n *\n * The preloader runs in the background. When the router bootstraps, the preloader\n * starts listening to all navigation events. After every such event, the preloader\n * will check if any configurations can be loaded lazily.\n *\n * If a route is protected by `canLoad` guards, the preloaded will not load it.\n *\n * @publicApi\n */\n@Injectable()\nexport class RouterPreloader implements OnDestroy {\n  private loader: RouterConfigLoader;\n  // TODO(issue/24571): remove '!'.\n  private subscription !: Subscription;\n\n  constructor(\n      private router: Router, moduleLoader: NgModuleFactoryLoader, compiler: Compiler,\n      private injector: Injector, private preloadingStrategy: PreloadingStrategy) {\n    const onStartLoad = (r: Route) => router.triggerEvent(new RouteConfigLoadStart(r));\n    const onEndLoad = (r: Route) => router.triggerEvent(new RouteConfigLoadEnd(r));\n\n    this.loader = new RouterConfigLoader(moduleLoader, compiler, onStartLoad, onEndLoad);\n  }\n\n  setUpPreloading(): void {\n    this.subscription =\n        this.router.events\n            .pipe(filter((e: Event) => e instanceof NavigationEnd), concatMap(() => this.preload()))\n            .subscribe(() => {});\n  }\n\n  preload(): Observable<any> {\n    const ngModule = this.injector.get(NgModuleRef);\n    return this.processRoutes(ngModule, this.router.config);\n  }\n\n  // TODO(jasonaden): This class relies on code external to the class to call setUpPreloading. If\n  // this hasn't been done, ngOnDestroy will fail as this.subscription will be undefined. This\n  // should be refactored.\n  ngOnDestroy(): void { this.subscription.unsubscribe(); }\n\n  private processRoutes(ngModule: NgModuleRef<any>, routes: Routes): Observable<void> {\n    const res: Observable<any>[] = [];\n    for (const route of routes) {\n      // we already have the config loaded, just recurse\n      if (route.loadChildren && !route.canLoad && route._loadedConfig) {\n        const childConfig = route._loadedConfig;\n        res.push(this.processRoutes(childConfig.module, childConfig.routes));\n\n        // no config loaded, fetch the config\n      } else if (route.loadChildren && !route.canLoad) {\n        res.push(this.preloadConfig(ngModule, route));\n\n        // recurse into children\n      } else if (route.children) {\n        res.push(this.processRoutes(ngModule, route.children));\n      }\n    }\n    return from(res).pipe(mergeAll(), map((_) => void 0));\n  }\n\n  private preloadConfig(ngModule: NgModuleRef<any>, route: Route): Observable<void> {\n    return this.preloadingStrategy.preload(route, () => {\n      const loaded$ = this.loader.load(ngModule.injector, route);\n      return loaded$.pipe(mergeMap((config: LoadedRouterConfig) => {\n        route._loadedConfig = config;\n        return this.processRoutes(config.module, config.routes);\n      }));\n    });\n  }\n}\n"]}