/**
 * @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 {Component, Injector, TemplateRef, ViewChild, ViewContainerRef} from '@angular/core';
import {TestBed} from '@angular/core/testing';

describe('TemplateRef', () => {
  describe('rootNodes', () => {
    @Component({template: `<ng-template #templateRef></ng-template>`})
    class App {
      @ViewChild('templateRef', {static: true}) templateRef!: TemplateRef<any>;
      minutes = 0;
    }

    function getRootNodes(template: string): any[] {
      TestBed.configureTestingModule({
        declarations: [App],
      });
      TestBed.overrideTemplate(App, template);
      const fixture = TestBed.createComponent(App);
      fixture.detectChanges();

      const embeddedView = fixture.componentInstance.templateRef.createEmbeddedView({});
      embeddedView.detectChanges();

      return embeddedView.rootNodes;
    }

    it('should return root render nodes for an embedded view instance', () => {
      const rootNodes = getRootNodes(
        `<ng-template #templateRef><div></div>some text<span></span></ng-template>`,
      );
      expect(rootNodes.length).toBe(3);
    });

    it('should return an empty array for embedded view with no nodes', () => {
      const rootNodes = getRootNodes('<ng-template #templateRef></ng-template>');
      expect(rootNodes.length).toBe(0);
    });

    it('should include projected nodes and their children', () => {
      @Component({
        selector: 'menu-content',
        template: `
              <ng-template>
                Header
                <ng-content></ng-content>
              </ng-template>
            `,
        exportAs: 'menuContent',
      })
      class MenuContent {
        @ViewChild(TemplateRef, {static: true}) template!: TemplateRef<any>;
      }

      @Component({
        template: `
              <menu-content #menu="menuContent">
                <button>Item one</button>
                <button>Item two</button>
                <ng-template [ngIf]="true"><button>Item three</button></ng-template>
              </menu-content>
            `,
      })
      class App {
        @ViewChild(MenuContent) content!: MenuContent;

        constructor(public viewContainerRef: ViewContainerRef) {}
      }

      TestBed.configureTestingModule({declarations: [MenuContent, App]});
      const fixture = TestBed.createComponent(App);
      fixture.detectChanges();

      const instance = fixture.componentInstance;
      const viewRef = instance.viewContainerRef.createEmbeddedView(instance.content.template);
      const rootNodeTextContent = viewRef.rootNodes
        .map((node) => node && node.textContent.trim())
        .filter((text) => text !== '' && text.indexOf('ng-reflect-ng-if') === -1);

      expect(rootNodeTextContent).toEqual(['Header', 'Item one', 'Item two', 'Item three']);
    });

    it('should descend into view containers on ng-template', () => {
      const rootNodes = getRootNodes(`
      <ng-template #templateRef>
        <ng-template [ngIf]="true">text|</ng-template>SUFFIX
      </ng-template>`);

      expect(rootNodes.length).toBe(3);
      expect(rootNodes[0].nodeType).toBe(Node.COMMENT_NODE);
      expect(rootNodes[1].nodeType).toBe(Node.TEXT_NODE);
      expect(rootNodes[2].nodeType).toBe(Node.TEXT_NODE);
    });

    it('should descend into view containers on an element', () => {
      /**
       * Expected DOM structure:
       * ```
       * <div ng-reflect-ng-template-outlet="[object Object]"></div>
       * text
       * <!--container-->
       * SUFFIX
       * ```
       */
      const rootNodes = getRootNodes(`
        <ng-template #dynamicTpl>text</ng-template>
        <ng-template #templateRef>
          <div [ngTemplateOutlet]="dynamicTpl"></div>SUFFIX
        </ng-template>
      `);

      expect(rootNodes.length).toBe(4);
      expect(rootNodes[0].nodeType).toBe(Node.ELEMENT_NODE);
      expect(rootNodes[1].nodeType).toBe(Node.TEXT_NODE);
      // This comment node is an anchor for the `ViewContainerRef`
      // created within the `NgTemplateOutlet` class.
      expect(rootNodes[2].nodeType).toBe(Node.COMMENT_NODE);
      expect(rootNodes[3].nodeType).toBe(Node.TEXT_NODE);
    });

    it('should descend into view containers on ng-container', () => {
      const rootNodes = getRootNodes(`
          <ng-template #dynamicTpl>text</ng-template>
          <ng-template #templateRef><ng-container [ngTemplateOutlet]="dynamicTpl"></ng-container>SUFFIX</ng-template>
        `);

      expect(rootNodes.length).toBe(3);
      expect(rootNodes[0].nodeType).toBe(Node.COMMENT_NODE);
      expect(rootNodes[1].nodeType).toBe(Node.TEXT_NODE);
      expect(rootNodes[2].nodeType).toBe(Node.TEXT_NODE);
    });

    it('should descend into element containers', () => {
      const rootNodes = getRootNodes(`
          <ng-template #templateRef>
            <ng-container>text</ng-container>
          </ng-template>
        `);

      expect(rootNodes.length).toBe(2);
      expect(rootNodes[0].nodeType).toBe(Node.COMMENT_NODE);
      expect(rootNodes[1].nodeType).toBe(Node.TEXT_NODE);
    });

    xit('should descend into ICU containers', () => {
      const rootNodes = getRootNodes(`
          <ng-template #templateRef>
            <ng-container i18n>Updated {minutes, select, =0 {just now} other {some time ago}}</ng-container>
          </ng-template>
        `);

      expect(rootNodes.length).toBe(4);
      expect(rootNodes[0].nodeType).toBe(Node.COMMENT_NODE); // ng-container
      expect(rootNodes[1].nodeType).toBe(Node.TEXT_NODE); // "Updated " text
      expect(rootNodes[2].nodeType).toBe(Node.COMMENT_NODE); // ICU container
      expect(rootNodes[3].nodeType).toBe(Node.TEXT_NODE); // "one minute ago" text
    });

    it('should return an empty array for an embedded view with projection and no projectable nodes', () => {
      const rootNodes = getRootNodes(
        `<ng-template #templateRef><ng-content></ng-content></ng-template>`,
      );
      expect(rootNodes.length).toBe(0);
    });

    it('should return an empty array for an embedded view with multiple projections and no projectable nodes', () => {
      const rootNodes = getRootNodes(
        `<ng-template #templateRef><ng-content></ng-content><ng-content select="foo"></ng-content></ng-template>`,
      );
      expect(rootNodes.length).toBe(0);
    });

    describe('projectable nodes provided to a dynamically created component', () => {
      @Component({selector: 'dynamic', template: ''})
      class DynamicCmp {
        @ViewChild('templateRef', {static: true}) templateRef!: TemplateRef<any>;
      }

      @Component({selector: 'test', template: ''})
      class TestCmp {
        constructor(public vcr: ViewContainerRef) {}
      }

      beforeEach(() => {
        TestBed.configureTestingModule({declarations: [TestCmp, DynamicCmp]});
      });

      it('should return projectable nodes when provided', () => {
        TestBed.overrideTemplate(
          DynamicCmp,
          `<ng-template #templateRef><ng-content></ng-content></ng-template>`,
        );

        const fixture = TestBed.createComponent(TestCmp);
        // Number of projectable nodes matches the number of slots - all nodes should be returned
        const projectableNodes = [[document.createTextNode('textNode')]];

        const cmptRef = fixture.componentInstance.vcr.createComponent(DynamicCmp, {
          injector: Injector.NULL,
          projectableNodes,
        });

        const viewRef = cmptRef.instance.templateRef.createEmbeddedView({});
        expect(viewRef.rootNodes.length).toBe(1);
      });

      it('should return an empty collection when no projectable nodes were provided', () => {
        TestBed.overrideTemplate(
          DynamicCmp,
          `<ng-template #templateRef><ng-content></ng-content></ng-template>`,
        );

        const fixture = TestBed.createComponent(TestCmp);

        // There are slots but projectable nodes were not provided - nothing should be returned
        const cmptRef = fixture.componentInstance.vcr.createComponent(DynamicCmp, {
          injector: Injector.NULL,
          projectableNodes: [],
        });
        const viewRef = cmptRef.instance.templateRef.createEmbeddedView({});
        expect(viewRef.rootNodes.length).toBe(0);
      });

      it('should return an empty collection when projectable nodes were provided but there are no slots', () => {
        TestBed.overrideTemplate(DynamicCmp, `<ng-template #templateRef></ng-template>`);

        const fixture = TestBed.createComponent(TestCmp);

        // There are no slots but projectable were provided - nothing should be returned
        const projectableNodes = [[document.createTextNode('textNode')]];

        const cmptRef = fixture.componentInstance.vcr.createComponent(DynamicCmp, {
          injector: Injector.NULL,
          projectableNodes,
        });
        const viewRef = cmptRef.instance.templateRef.createEmbeddedView({});
        expect(viewRef.rootNodes.length).toBe(0);
      });
    });
  });

  describe('context', () => {
    @Component({
      template: `
      <ng-template #templateRef let-name="name">{{name}}</ng-template>
      <ng-container #containerRef></ng-container>
    `,
    })
    class App {
      @ViewChild('templateRef') templateRef!: TemplateRef<any>;
      @ViewChild('containerRef', {read: ViewContainerRef}) containerRef!: ViewContainerRef;
    }

    it('should update if the context of a view ref is mutated', () => {
      TestBed.configureTestingModule({declarations: [App]});
      const fixture = TestBed.createComponent(App);
      fixture.detectChanges();
      const context = {name: 'Frodo'};
      const viewRef = fixture.componentInstance.templateRef.createEmbeddedView(context);
      fixture.componentInstance.containerRef.insert(viewRef);
      fixture.detectChanges();

      expect(fixture.nativeElement.textContent).toBe('Frodo');

      context.name = 'Bilbo';
      fixture.detectChanges();

      expect(fixture.nativeElement.textContent).toBe('Bilbo');
    });

    it('should update if the context of a view ref is replaced', () => {
      TestBed.configureTestingModule({declarations: [App]});
      const fixture = TestBed.createComponent(App);
      fixture.detectChanges();
      const viewRef = fixture.componentInstance.templateRef.createEmbeddedView({name: 'Frodo'});
      fixture.componentInstance.containerRef.insert(viewRef);
      fixture.detectChanges();

      expect(fixture.nativeElement.textContent).toBe('Frodo');

      viewRef.context = {name: 'Bilbo'};
      fixture.detectChanges();

      expect(fixture.nativeElement.textContent).toBe('Bilbo');
    });

    it('should use the latest context information inside template listeners', () => {
      const events: string[] = [];

      @Component({
        template: `
          <ng-template #templateRef let-name="name">
            <button (click)="log(name)"></button>
          </ng-template>
          <ng-container #containerRef></ng-container>
        `,
      })
      class ListenerTest {
        @ViewChild('templateRef') templateRef!: TemplateRef<any>;
        @ViewChild('containerRef', {read: ViewContainerRef}) containerRef!: ViewContainerRef;

        log(name: string) {
          events.push(name);
        }
      }

      TestBed.configureTestingModule({declarations: [ListenerTest]});
      const fixture = TestBed.createComponent(ListenerTest);
      fixture.detectChanges();
      const viewRef = fixture.componentInstance.templateRef.createEmbeddedView({name: 'Frodo'});
      fixture.componentInstance.containerRef.insert(viewRef);
      fixture.detectChanges();

      const button = fixture.nativeElement.querySelector('button');
      button.click();
      expect(events).toEqual(['Frodo']);

      viewRef.context = {name: 'Bilbo'};
      fixture.detectChanges();
      button.click();
      expect(events).toEqual(['Frodo', 'Bilbo']);
    });

    it('should warn if the context of an embedded view ref is replaced', () => {
      TestBed.configureTestingModule({declarations: [App]});
      const fixture = TestBed.createComponent(App);
      fixture.detectChanges();
      const viewRef = fixture.componentInstance.templateRef.createEmbeddedView({name: 'Frodo'});
      fixture.componentInstance.containerRef.insert(viewRef);
      fixture.detectChanges();

      expect(fixture.nativeElement.textContent).toBe('Frodo');
      spyOn(console, 'warn');

      viewRef.context = {name: 'Bilbo'};
      fixture.detectChanges();

      expect(console.warn).toHaveBeenCalledTimes(1);
      expect(console.warn).toHaveBeenCalledWith(
        jasmine.stringContaining(
          'Replacing the `context` object of an `EmbeddedViewRef` is deprecated',
        ),
      );
      expect(fixture.nativeElement.textContent).toBe('Bilbo');
    });
  });
});
