/**
 * @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 {CommonModule} from '@angular/common';
import {NgComponentOutlet} from '@angular/common/src/directives/ng_component_outlet';
import {Compiler, Component, ComponentRef, Inject, InjectionToken, Injector, NO_ERRORS_SCHEMA, NgModule, NgModuleFactory, Optional, QueryList, StaticProvider, TemplateRef, Type, ViewChild, ViewChildren, ViewContainerRef} from '@angular/core';
import {TestBed, async, fakeAsync} from '@angular/core/testing';
import {expect} from '@angular/platform-browser/testing/src/matchers';

{
  describe('insert/remove', () => {

    beforeEach(() => { TestBed.configureTestingModule({imports: [TestModule]}); });

    it('should do nothing if component is null', async(() => {
         const template = `<ng-template *ngComponentOutlet="currentComponent"></ng-template>`;
         TestBed.overrideComponent(TestComponent, {set: {template: template}});
         let fixture = TestBed.createComponent(TestComponent);

         fixture.componentInstance.currentComponent = null;
         fixture.detectChanges();

         expect(fixture.nativeElement).toHaveText('');
       }));

    it('should insert content specified by a component', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.currentComponent = InjectedComponent;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('foo');
       }));

    it('should emit a ComponentRef once a component was created', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.cmpRef = null;
         fixture.componentInstance.currentComponent = InjectedComponent;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('foo');
         expect(fixture.componentInstance.cmpRef).toBeAnInstanceOf(ComponentRef);
         expect(fixture.componentInstance.cmpRef !.instance).toBeAnInstanceOf(InjectedComponent);
       }));


    it('should clear view if component becomes null', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.currentComponent = InjectedComponent;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('foo');

         fixture.componentInstance.currentComponent = null;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');
       }));


    it('should swap content if component changes', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.currentComponent = InjectedComponent;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('foo');

         fixture.componentInstance.currentComponent = InjectedComponentAgain;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('bar');
       }));

    it('should use the injector, if one supplied', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         const uniqueValue = {};
         fixture.componentInstance.currentComponent = InjectedComponent;
         fixture.componentInstance.injector = Injector.create(
             [{provide: TEST_TOKEN, useValue: uniqueValue}], fixture.componentRef.injector);

         fixture.detectChanges();
         let cmpRef: ComponentRef<InjectedComponent> = fixture.componentInstance.cmpRef !;
         expect(cmpRef).toBeAnInstanceOf(ComponentRef);
         expect(cmpRef.instance).toBeAnInstanceOf(InjectedComponent);
         expect(cmpRef.instance.testToken).toBe(uniqueValue);

       }));

    it('should resolve a with injector', async(() => {
         let fixture = TestBed.createComponent(TestComponent);

         fixture.componentInstance.cmpRef = null;
         fixture.componentInstance.currentComponent = InjectedComponent;
         fixture.detectChanges();
         let cmpRef: ComponentRef<InjectedComponent> = fixture.componentInstance.cmpRef !;
         expect(cmpRef).toBeAnInstanceOf(ComponentRef);
         expect(cmpRef.instance).toBeAnInstanceOf(InjectedComponent);
         expect(cmpRef.instance.testToken).toBeNull();
       }));

    it('should render projectable nodes, if supplied', async(() => {
         const template = `<ng-template>projected foo</ng-template>${TEST_CMP_TEMPLATE}`;
         TestBed.overrideComponent(TestComponent, {set: {template: template}})
             .configureTestingModule({schemas: [NO_ERRORS_SCHEMA]});

         TestBed
             .overrideComponent(InjectedComponent, {set: {template: `<ng-content></ng-content>`}})
             .configureTestingModule({schemas: [NO_ERRORS_SCHEMA]});

         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.currentComponent = InjectedComponent;
         fixture.componentInstance.projectables =
             [fixture.componentInstance.vcRef
                  .createEmbeddedView(fixture.componentInstance.tplRefs.first)
                  .rootNodes];


         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('projected foo');
       }));

    it('should resolve components from other modules, if supplied', async(() => {
         const compiler = TestBed.get(Compiler) as Compiler;
         let fixture = TestBed.createComponent(TestComponent);

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('');

         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
         fixture.componentInstance.currentComponent = Module2InjectedComponent;

         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('baz');
       }));

    it('should clean up moduleRef, if supplied', async(() => {
         let destroyed = false;
         const compiler = TestBed.get(Compiler) as Compiler;
         const fixture = TestBed.createComponent(TestComponent);
         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
         fixture.componentInstance.currentComponent = Module2InjectedComponent;
         fixture.detectChanges();

         const moduleRef = fixture.componentInstance.ngComponentOutlet['_moduleRef'] !;
         spyOn(moduleRef, 'destroy').and.callThrough();

         expect(moduleRef.destroy).not.toHaveBeenCalled();
         fixture.destroy();
         expect(moduleRef.destroy).toHaveBeenCalled();
       }));

    it('should not re-create moduleRef when it didn\'t actually change', async(() => {
         const compiler = TestBed.get(Compiler) as Compiler;
         const fixture = TestBed.createComponent(TestComponent);

         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
         fixture.componentInstance.currentComponent = Module2InjectedComponent;
         fixture.detectChanges();
         expect(fixture.nativeElement).toHaveText('baz');
         const moduleRef = fixture.componentInstance.ngComponentOutlet['_moduleRef'];

         fixture.componentInstance.currentComponent = Module2InjectedComponent2;
         fixture.detectChanges();

         expect(fixture.nativeElement).toHaveText('baz2');
         expect(moduleRef).toBe(fixture.componentInstance.ngComponentOutlet['_moduleRef']);
       }));

    it('should re-create moduleRef when changed', async(() => {
         const compiler = TestBed.get(Compiler) as Compiler;
         const fixture = TestBed.createComponent(TestComponent);
         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
         fixture.componentInstance.currentComponent = Module2InjectedComponent;
         fixture.detectChanges();

         expect(fixture.nativeElement).toHaveText('baz');

         fixture.componentInstance.module = compiler.compileModuleSync(TestModule3);
         fixture.componentInstance.currentComponent = Module3InjectedComponent;
         fixture.detectChanges();

         expect(fixture.nativeElement).toHaveText('bat');
       }));
  });
}

const TEST_TOKEN = new InjectionToken('TestToken');
@Component({selector: 'injected-component', template: 'foo'})
class InjectedComponent {
  constructor(@Optional() @Inject(TEST_TOKEN) public testToken: any) {}
}


@Component({selector: 'injected-component-again', template: 'bar'})
class InjectedComponentAgain {
}

const TEST_CMP_TEMPLATE =
    `<ng-template *ngComponentOutlet="currentComponent; injector: injector; content: projectables; ngModuleFactory: module;"></ng-template>`;
@Component({selector: 'test-cmp', template: TEST_CMP_TEMPLATE})
class TestComponent {
  // TODO(issue/24571): remove '!'.
  currentComponent !: Type<any>| null;
  // TODO(issue/24571): remove '!'.
  injector !: Injector;
  // TODO(issue/24571): remove '!'.
  projectables !: any[][];
  // TODO(issue/24571): remove '!'.
  module !: NgModuleFactory<any>;

  get cmpRef(): ComponentRef<any>|null { return this.ngComponentOutlet['_componentRef']; }
  set cmpRef(value: ComponentRef<any>|null) { this.ngComponentOutlet['_componentRef'] = value; }

  // TODO(issue/24571): remove '!'.
  @ViewChildren(TemplateRef) tplRefs !: QueryList<TemplateRef<any>>;
  // TODO(issue/24571): remove '!'.
  @ViewChild(NgComponentOutlet) ngComponentOutlet !: NgComponentOutlet;

  constructor(public vcRef: ViewContainerRef) {}
}

@NgModule({
  imports: [CommonModule],
  declarations: [TestComponent, InjectedComponent, InjectedComponentAgain],
  exports: [TestComponent, InjectedComponent, InjectedComponentAgain],
  entryComponents: [InjectedComponent, InjectedComponentAgain]
})
export class TestModule {
}

@Component({selector: 'module-2-injected-component', template: 'baz'})
class Module2InjectedComponent {
}

@Component({selector: 'module-2-injected-component-2', template: 'baz2'})
class Module2InjectedComponent2 {
}

@NgModule({
  imports: [CommonModule],
  declarations: [Module2InjectedComponent, Module2InjectedComponent2],
  exports: [Module2InjectedComponent, Module2InjectedComponent2],
  entryComponents: [Module2InjectedComponent, Module2InjectedComponent2]
})
export class TestModule2 {
}

@Component({selector: 'module-3-injected-component', template: 'bat'})
class Module3InjectedComponent {
}

@NgModule({
  imports: [CommonModule],
  declarations: [Module3InjectedComponent],
  exports: [Module3InjectedComponent],
  entryComponents: [Module3InjectedComponent]
})
export class TestModule3 {
}