import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { RouterModule } from '@angular/router';
import { UniversalModule, isBrowser, isNode } from 'angular2-universal/node'; // for AoT we need to manually split universal packages

import { AppModule} from '../browser/app/app.module';
import {AppComponent } from '../browser/app/app.component';
import {SharedModule} from "../browser/app/core/shared.module";
import {CacheService} from "../browser/app/core/cache.service";


// Will be merged into @angular/platform-browser in a later release
// see https://github.com/angular/angular/pull/12322
import { Meta } from './helpers/angular2-meta';

export function getLRU() {
    return new Map();
}
export function getRequest() {
    return {};
}
export function getResponse() {
    return {};
}

// TODO(gdi2290): refactor into Universal
export const UNIVERSAL_KEY = 'UNIVERSAL_CACHE';

@NgModule({
    bootstrap: [ AppComponent ],
    imports: [
        UniversalModule, // BrowserModule, HttpModule, and JsonpModule are included
        FormsModule,
        RouterModule.forRoot([], { useHash: false }),
        SharedModule.forRoot(),
        AppModule,
    ],
    providers: [
        { provide: 'isBrowser', useValue: isBrowser },
        { provide: 'isNode', useValue: isNode },

        { provide: 'req', useFactory: getRequest },
        { provide: 'res', useFactory: getResponse },

        { provide: 'LRU', useFactory: getLRU, deps: [] },

       CacheService,

        Meta,
    ]
})
export class MainModule {
    constructor(public cache: CacheService) {}

    /**
     * We need to use the arrow function here to bind the context as this is a gotcha
     * in Universal for now until it's fixed
     */
    universalDoDehydrate = (universalCache) => {
        universalCache[CacheService.KEY] = JSON.stringify(this.cache.dehydrate());
    };
    /**
     * Clear the cache after it's rendered
     */
    universalAfterDehydrate = () => {
        // comment out if LRU provided at platform level to be shared between each user
        this.cache.clear();
    }
}