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import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import {
  NgModule,
  ApplicationRef
} from '@angular/core';
import {
  removeNgStyles,
  createNewHosts,
  createInputTransfer
} from '@angularclass/hmr';
import {
  RouterModule,
  PreloadAllModules
} from '@angular/router';

/*
 * Platform and Environment providers/directives/pipes
 */
import { ENV_PROVIDERS } from './environment';
import { ROUTES } from './app.routes';
// App is our top level component
import { AppComponent } from './app.component';
import { APP_RESOLVER_PROVIDERS } from './app.resolver';
import { InternalStateType } from './app.service';
import { HomeComponent, VisualizationComponent } from './home';
import { TimeNetDataService } from './home/timenet.service';

import { BarchartComponent } from './shared/barchart.component';
import { Typeahead } from './shared/ng2-typeahead';

import '../styles/styles.scss';
import '../styles/headings.css';

// Application wide providers
const APP_PROVIDERS = [
  ...APP_RESOLVER_PROVIDERS,
    TimeNetDataService
];

type StoreType = {
  state: InternalStateType,
  restoreInputValues: () => void,
  disposeOldHosts: () => void
};

/**
 * `AppModule` is the main entry point into Angular2's bootstraping process
 */
@NgModule({
  bootstrap: [ AppComponent ],
  declarations: [
    AppComponent,
      HomeComponent,
      VisualizationComponent,
	BarchartComponent,
    Typeahead
  ],
  imports: [ // import Angular's modules
    BrowserModule,
    FormsModule,
    HttpModule,
    RouterModule.forRoot(ROUTES, { useHash: true, preloadingStrategy: PreloadAllModules })
  ],
  providers: [ // expose our Services and Providers into Angular's dependency injection
    ENV_PROVIDERS,
    APP_PROVIDERS
  ]
})
export class AppModule {

  constructor(
    public appRef: ApplicationRef
  ) {}

  public hmrOnInit(store: StoreType) {
    if (!store || !store.state) {
      return;
    }
    console.log('HMR store', JSON.stringify(store, null, 2));
    // set state
    // set input values
    if ('restoreInputValues' in store) {
      let restoreInputValues = store.restoreInputValues;
      setTimeout(restoreInputValues);
    }

    this.appRef.tick();
    delete store.state;
    delete store.restoreInputValues;
  }

  public hmrOnDestroy(store: StoreType) {
    const cmpLocation = this.appRef.components.map((cmp) => cmp.location.nativeElement);
    // recreate root elements
    store.disposeOldHosts = createNewHosts(cmpLocation);
    // save input values
    store.restoreInputValues  = createInputTransfer();
    // remove styles
    removeNgStyles();
  }

  public hmrAfterDestroy(store: StoreType) {
    // display new elements
    store.disposeOldHosts();
    delete store.disposeOldHosts;
  }

}