/**
 * @license
 * Copyright Google LLC 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 { Compiler, inject, Injectable, InjectionToken, NgModuleFactory } from '@angular/core';
import { ConnectableObservable, from, of, Subject } from 'rxjs';
import { finalize, map, mergeMap, refCount, tap } from 'rxjs/operators';
import { wrapIntoObservable } from './utils/collection';
import { assertStandalone, standardizeConfig, validateConfig } from './utils/config';
import * as i0 from "@angular/core";
/**
 * The [DI token](guide/glossary/#di-token) for a router configuration.
 *
 * `ROUTES` is a low level API for router configuration via dependency injection.
 *
 * We recommend that in almost all cases to use higher level APIs such as `RouterModule.forRoot()`,
 * `provideRouter`, or `Router.resetConfig()`.
 *
 * @publicApi
 */
export const ROUTES = new InjectionToken('ROUTES');
export class RouterConfigLoader {
    constructor() {
        this.componentLoaders = new WeakMap();
        this.childrenLoaders = new WeakMap();
        this.compiler = inject(Compiler);
    }
    loadComponent(route) {
        if (this.componentLoaders.get(route)) {
            return this.componentLoaders.get(route);
        }
        else if (route._loadedComponent) {
            return of(route._loadedComponent);
        }
        if (this.onLoadStartListener) {
            this.onLoadStartListener(route);
        }
        const loadRunner = wrapIntoObservable(route.loadComponent())
            .pipe(map(maybeUnwrapDefaultExport), tap(component => {
            if (this.onLoadEndListener) {
                this.onLoadEndListener(route);
            }
            (typeof ngDevMode === 'undefined' || ngDevMode) &&
                assertStandalone(route.path ?? '', component);
            route._loadedComponent = component;
        }), finalize(() => {
            this.componentLoaders.delete(route);
        }));
        // Use custom ConnectableObservable as share in runners pipe increasing the bundle size too much
        const loader = new ConnectableObservable(loadRunner, () => new Subject()).pipe(refCount());
        this.componentLoaders.set(route, loader);
        return loader;
    }
    loadChildren(parentInjector, route) {
        if (this.childrenLoaders.get(route)) {
            return this.childrenLoaders.get(route);
        }
        else if (route._loadedRoutes) {
            return of({ routes: route._loadedRoutes, injector: route._loadedInjector });
        }
        if (this.onLoadStartListener) {
            this.onLoadStartListener(route);
        }
        const moduleFactoryOrRoutes$ = loadChildren(route, this.compiler, parentInjector, this.onLoadEndListener);
        const loadRunner = moduleFactoryOrRoutes$.pipe(finalize(() => {
            this.childrenLoaders.delete(route);
        }));
        // Use custom ConnectableObservable as share in runners pipe increasing the bundle size too much
        const loader = new ConnectableObservable(loadRunner, () => new Subject())
            .pipe(refCount());
        this.childrenLoaders.set(route, loader);
        return loader;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: RouterConfigLoader, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: RouterConfigLoader, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: RouterConfigLoader, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }] });
/**
 * Executes a `route.loadChildren` callback and converts the result to an array of child routes and
 * an injector if that callback returned a module.
 *
 * This function is used for the route discovery during prerendering
 * in @angular-devkit/build-angular. If there are any updates to the contract here, it will require
 * an update to the extractor.
 */
export function loadChildren(route, compiler, parentInjector, onLoadEndListener) {
    return wrapIntoObservable(route.loadChildren())
        .pipe(map(maybeUnwrapDefaultExport), mergeMap((t) => {
        if (t instanceof NgModuleFactory || Array.isArray(t)) {
            return of(t);
        }
        else {
            return from(compiler.compileModuleAsync(t));
        }
    }), map((factoryOrRoutes) => {
        if (onLoadEndListener) {
            onLoadEndListener(route);
        }
        // This injector comes from the `NgModuleRef` when lazy loading an `NgModule`. There is
        // no injector associated with lazy loading a `Route` array.
        let injector;
        let rawRoutes;
        let requireStandaloneComponents = false;
        if (Array.isArray(factoryOrRoutes)) {
            rawRoutes = factoryOrRoutes;
            requireStandaloneComponents = true;
        }
        else {
            injector = factoryOrRoutes.create(parentInjector).injector;
            // When loading a module that doesn't provide `RouterModule.forChild()` preloader
            // will get stuck in an infinite loop. The child module's Injector will look to
            // its parent `Injector` when it doesn't find any ROUTES so it will return routes
            // for it's parent module instead.
            rawRoutes = injector.get(ROUTES, [], { optional: true, self: true }).flat();
        }
        const routes = rawRoutes.map(standardizeConfig);
        (typeof ngDevMode === 'undefined' || ngDevMode) &&
            validateConfig(routes, route.path, requireStandaloneComponents);
        return { routes, injector };
    }));
}
function isWrappedDefaultExport(value) {
    // We use `in` here with a string key `'default'`, because we expect `DefaultExport` objects to be
    // dynamically imported ES modules with a spec-mandated `default` key. Thus we don't expect that
    // `default` will be a renamed property.
    return value && typeof value === 'object' && 'default' in value;
}
function maybeUnwrapDefaultExport(input) {
    // As per `isWrappedDefaultExport`, the `default` key here is generated by the browser and not
    // subject to property renaming, so we reference it with bracket access.
    return isWrappedDefaultExport(input) ? input['default'] : input;
}
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* @license\n * Copyright Google LLC 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, EnvironmentInjector, inject, Injectable, InjectFlags, InjectionToken, Injector, NgModuleFactory, Type} from '@angular/core';\nimport {ConnectableObservable, from, Observable, of, Subject} from 'rxjs';\nimport {finalize, map, mergeMap, refCount, tap} from 'rxjs/operators';\n\nimport {DefaultExport, LoadChildren, LoadChildrenCallback, LoadedRouterConfig, Route, Routes} from './models';\nimport {wrapIntoObservable} from './utils/collection';\nimport {assertStandalone, standardizeConfig, validateConfig} from './utils/config';\n\n\n\n/**\n * The [DI token](guide/glossary/#di-token) for a router configuration.\n *\n * `ROUTES` is a low level API for router configuration via dependency injection.\n *\n * We recommend that in almost all cases to use higher level APIs such as `RouterModule.forRoot()`,\n * `provideRouter`, or `Router.resetConfig()`.\n *\n * @publicApi\n */\nexport const ROUTES = new InjectionToken<Route[][]>('ROUTES');\n\ntype ComponentLoader = Observable<Type<unknown>>;\n\n@Injectable({providedIn: 'root'})\nexport class RouterConfigLoader {\n  private componentLoaders = new WeakMap<Route, ComponentLoader>();\n  private childrenLoaders = new WeakMap<Route, Observable<LoadedRouterConfig>>();\n  onLoadStartListener?: (r: Route) => void;\n  onLoadEndListener?: (r: Route) => void;\n  private readonly compiler = inject(Compiler);\n\n  loadComponent(route: Route): Observable<Type<unknown>> {\n    if (this.componentLoaders.get(route)) {\n      return this.componentLoaders.get(route)!;\n    } else if (route._loadedComponent) {\n      return of(route._loadedComponent);\n    }\n\n    if (this.onLoadStartListener) {\n      this.onLoadStartListener(route);\n    }\n    const loadRunner = wrapIntoObservable(route.loadComponent!())\n                           .pipe(\n                               map(maybeUnwrapDefaultExport),\n                               tap(component => {\n                                 if (this.onLoadEndListener) {\n                                   this.onLoadEndListener(route);\n                                 }\n                                 (typeof ngDevMode === 'undefined' || ngDevMode) &&\n                                     assertStandalone(route.path ?? '', component);\n                                 route._loadedComponent = component;\n                               }),\n                               finalize(() => {\n                                 this.componentLoaders.delete(route);\n                               }),\n                           );\n    // Use custom ConnectableObservable as share in runners pipe increasing the bundle size too much\n    const loader =\n        new ConnectableObservable(loadRunner, () => new Subject<Type<unknown>>()).pipe(refCount());\n    this.componentLoaders.set(route, loader);\n    return loader;\n  }\n\n  loadChildren(parentInjector: Injector, route: Route): Observable<LoadedRouterConfig> {\n    if (this.childrenLoaders.get(route)) {\n      return this.childrenLoaders.get(route)!;\n    } else if (route._loadedRoutes) {\n      return of({routes: route._loadedRoutes, injector: route._loadedInjector});\n    }\n\n    if (this.onLoadStartListener) {\n      this.onLoadStartListener(route);\n    }\n    const moduleFactoryOrRoutes$ =\n        loadChildren(route, this.compiler, parentInjector, this.onLoadEndListener);\n    const loadRunner = moduleFactoryOrRoutes$.pipe(\n        finalize(() => {\n          this.childrenLoaders.delete(route);\n        }),\n    );\n    // Use custom ConnectableObservable as share in runners pipe increasing the bundle size too much\n    const loader = new ConnectableObservable(loadRunner, () => new Subject<LoadedRouterConfig>())\n                       .pipe(refCount());\n    this.childrenLoaders.set(route, loader);\n    return loader;\n  }\n}\n\n/**\n * Executes a `route.loadChildren` callback and converts the result to an array of child routes and\n * an injector if that callback returned a module.\n *\n * This function is used for the route discovery during prerendering\n * in @angular-devkit/build-angular. If there are any updates to the contract here, it will require\n * an update to the extractor.\n */\nexport function loadChildren(\n    route: Route, compiler: Compiler, parentInjector: Injector,\n    onLoadEndListener?: (r: Route) => void): Observable<LoadedRouterConfig> {\n  return wrapIntoObservable(route.loadChildren!())\n      .pipe(\n          map(maybeUnwrapDefaultExport),\n          mergeMap((t) => {\n            if (t instanceof NgModuleFactory || Array.isArray(t)) {\n              return of(t);\n            } else {\n              return from(compiler.compileModuleAsync(t));\n            }\n          }),\n          map((factoryOrRoutes: NgModuleFactory<any>|Routes) => {\n            if (onLoadEndListener) {\n              onLoadEndListener(route);\n            }\n            // This injector comes from the `NgModuleRef` when lazy loading an `NgModule`. There is\n            // no injector associated with lazy loading a `Route` array.\n            let injector: EnvironmentInjector|undefined;\n            let rawRoutes: Route[];\n            let requireStandaloneComponents = false;\n            if (Array.isArray(factoryOrRoutes)) {\n              rawRoutes = factoryOrRoutes;\n              requireStandaloneComponents = true;\n            } else {\n              injector = factoryOrRoutes.create(parentInjector).injector;\n              // When loading a module that doesn't provide `RouterModule.forChild()` preloader\n              // will get stuck in an infinite loop. The child module's Injector will look to\n              // its parent `Injector` when it doesn't find any ROUTES so it will return routes\n              // for it's parent module instead.\n              rawRoutes = injector.get(ROUTES, [], {optional: true, self: true}).flat();\n            }\n            const routes = rawRoutes.map(standardizeConfig);\n            (typeof ngDevMode === 'undefined' || ngDevMode) &&\n                validateConfig(routes, route.path, requireStandaloneComponents);\n            return {routes, injector};\n          }),\n      );\n}\n\nfunction isWrappedDefaultExport<T>(value: T|DefaultExport<T>): value is DefaultExport<T> {\n  // We use `in` here with a string key `'default'`, because we expect `DefaultExport` objects to be\n  // dynamically imported ES modules with a spec-mandated `default` key. Thus we don't expect that\n  // `default` will be a renamed property.\n  return value && typeof value === 'object' && 'default' in value;\n}\n\nfunction maybeUnwrapDefaultExport<T>(input: T|DefaultExport<T>): T {\n  // As per `isWrappedDefaultExport`, the `default` key here is generated by the browser and not\n  // subject to property renaming, so we reference it with bracket access.\n  return isWrappedDefaultExport(input) ? input['default'] : input;\n}\n"]}