/**
 * @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 * as ts from 'typescript';

import {createLanguageService} from '../src/language_service';
import {TypeScriptServiceHost} from '../src/typescript_host';

import {MockTypescriptHost} from './test_utils';

describe('completions', () => {
  let mockHost = new MockTypescriptHost(['/app/main.ts', '/app/parsing-cases.ts']);
  let service = ts.createLanguageService(mockHost);
  let ngHost = new TypeScriptServiceHost(mockHost, service);
  let ngService = createLanguageService(ngHost);

  beforeEach(() => { mockHost.reset(); });

  it('should be able to get entity completions',
     () => { expectContains('/app/test.ng', 'entity-amp', '&', '>', '<', 'ι'); });

  it('should be able to return html elements', () => {
    let htmlTags = ['h1', 'h2', 'div', 'span'];
    let locations = ['empty', 'start-tag-h1', 'h1-content', 'start-tag', 'start-tag-after-h'];
    for (let location of locations) {
      expectContains('/app/test.ng', location, ...htmlTags);
    }
  });

  it('should be able to return element diretives',
     () => { expectContains('/app/test.ng', 'empty', 'my-app'); });

  it('should be able to return h1 attributes',
     () => { expectContains('/app/test.ng', 'h1-after-space', 'id', 'dir', 'lang', 'onclick'); });

  it('should be able to find common angular attributes',
     () => { expectContains('/app/test.ng', 'div-attributes', '(click)', '[ngClass]'); });

  it('should be able to infer the type of a ngForOf', () => {
    const fileName = mockHost.addCode(`
      interface Person {
        name: string,
        street: string
      }

      @Component({template: '<div *ngFor="let person of people">{{person.~{name}name}}</div'})
      export class MyComponent {
        people: Person[]
      }`);
    expectContains(fileName, 'name', 'name', 'street');
  });

  it('should be able to get completions for exported *ngIf variable', () => {
    const fileName = mockHost.addCode(`
      interface Person {
        name: string,
        street: string
      }

      @Component({template: '<div *ngIf="promised_person | async as person">{{person.~{name}name}}</div'})
      export class MyComponent {
        promised_person: Promise<Person>
      }`);
    expectContains(fileName, 'name', 'name', 'street');
  });

  it('should be able to infer the type of a ngForOf with an async pipe', () => {
    const fileName = mockHost.addCode(`
      interface Person {
        name: string,
        street: string
      }

      @Component({template: '<div *ngFor="let person of people | async">{{person.~{name}name}}</div>'})
      export class MyComponent {
        people: Promise<Person[]>;
      }`);
    expectContains(fileName, 'name', 'name', 'street');
  });

  describe('with regression tests', () => {
    it('should not crash with an incomplete component', () => {
      expect(() => {
        const fileName = mockHost.addCode(`
          @Component({
            template: '~{inside-template}'
          })
          export class MyComponent {

          }`);

        expectContains(fileName, 'inside-template', 'h1');
      }).not.toThrow();
    });

    it('should hot crash with an incomplete class', () => {
      expect(() => {
        mockHost.addCode('\nexport class');
        ngHost.getAnalyzedModules();
      }).not.toThrow();
    });

  });

  it('should respect paths configuration', () => {
    mockHost.overrideOptions({
      baseUrl: '/app',
      paths: {'bar/*': ['foo/bar/*']},
    });
    mockHost.addScript('/app/foo/bar/shared.ts', `
      export interface Node {
        children: Node[];
      }
    `);
    mockHost.addScript('/app/my.component.ts', `
      import { Component } from '@angular/core';
      import { Node } from 'bar/shared';

      @Component({
        selector: 'my-component',
        template: '{{tree.~{tree} }}'
      })
      export class MyComponent {
        tree: Node;
      }
    `);
    ngHost.getAnalyzedModules();
    expectContains('/app/my.component.ts', 'tree', 'children');
  });

  it('should work with input and output', () => {
    const fileName = mockHost.addCode(`
      @Component({
        selector: 'foo-component',
        template: \`
          <div string-model ~{stringMarker}="text"></div>
          <div number-model ~{numberMarker}="value"></div>
        \`,
      })
      export class FooComponent {
        text: string;
        value: number;
      }
    `);
    expectContains(fileName, 'stringMarker', '[model]', '(model)');
    expectContains(fileName, 'numberMarker', '[inputAlias]', '(outputAlias)');
  });

  function expectContains(fileName: string, locationMarker: string, ...names: string[]) {
    const marker = mockHost.getLocationMarkerFor(fileName, locationMarker);
    expectEntries(locationMarker, ngService.getCompletionsAt(fileName, marker.start), ...names);
  }
});


function expectEntries(
    locationMarker: string, completion: ts.CompletionInfo | undefined, ...names: string[]) {
  let entries: {[name: string]: boolean} = {};
  if (!completion) {
    throw new Error(
        `Expected result from ${locationMarker} to include ${names.join(', ')} but no result provided`);
  }
  if (!completion.entries.length) {
    throw new Error(
        `Expected result from ${locationMarker} to include ${names.join(', ')} an empty result provided`);
  }
  for (const entry of completion.entries) {
    entries[entry.name] = true;
  }
  let missing = names.filter(name => !entries[name]);
  if (missing.length) {
    throw new Error(
        `Expected result from ${locationMarker} to include at least one of the following, ${missing.join(', ')}, in the list of entries ${completion.entries.map(entry => entry.name).join(', ')}`);
  }
}