import { TestBed } from '@angular/core/testing';
import { ConfigService } from '@arrow/bom/config';
import { TranslateService } from '@ngx-translate/core';

import { Utils } from './utils.service';

describe('UtilsService', () => {
  let utilsService: Utils;
  let configServiceSpy: jasmine.SpyObj<ConfigService>;
  let translateServiceSpy: jasmine.SpyObj<TranslateService>;

  beforeEach(() => {
    const configServiceSpyObj = jasmine.createSpyObj('ConfigService', ['getTarget']);
    const translateServiceSpyObj = jasmine.createSpyObj('TranslateService', ['instant']);

    TestBed.configureTestingModule({
      providers: [
        { provide: ConfigService, useValue: configServiceSpyObj },
        { provide: TranslateService, useValue: translateServiceSpyObj },
        Utils
      ] 
    })
  });

  it('Utils service should be created', () => {
    utilsService = TestBed.inject(Utils);
    configServiceSpy = TestBed.inject(ConfigService) as jasmine.SpyObj<ConfigService>;
    translateServiceSpy = TestBed.inject(TranslateService) as jasmine.SpyObj<TranslateService>;

    expect(utilsService).toBeTruthy();
  });

  // Disabled since it was failing intermittently
  // it(`translateByKeyWithFallback should return empty for missing parameters`, () => {
  //   expect(utilsService.translateByKeyWithFallback("", "")).toEqual("");
  // });

  [
    { translateKey: "", translatedText: "translated", fallback: "fallback",  output: "fallback", useCaseName: "translateByKeyWithFallback returns fallbackStr for missing translationKey" },
    { translateKey: null, translatedText: "translated", fallback: "fallback",  output: "fallback", useCaseName: "translateByKeyWithFallback returns fallbackStr for translationKey being null" },
    { translateKey: "nameId", translatedText: "nameId", fallback: "fallback",  output: "fallback", useCaseName: "translateByKeyWithFallback returns fallbackStr for missing translation" }, // Translated text equals key when there is no translation for a key in messages.<lang>.json
    { translateKey: "nameId", translatedText: "nameId", fallback: "",  output: "nameId", useCaseName: "translateByKeyWithFallback returns translation key for missing translation and fallback" }, // Translated text equals key when there is no translation for a key in messages.<lang>.json
    { translateKey: "nameId", translatedText: "nameId", fallback: null,  output: "nameId", useCaseName: "translateByKeyWithFallback returns translation key for missing translation and fallback being null" }, // Translated text equals key when there is no translation for a key in messages.<lang>.json
    { translateKey: "nameId", translatedText: "translated", fallback: "fallback",  output: "translated", useCaseName: "translateByKeyWithFallback returns translation" },
    { translateKey: "nameId", translatedText: "translated", fallback: "",  output: "translated", useCaseName: "translateByKeyWithFallback returns translation (no fallback available)" },
    { translateKey: "nameId", translatedText: "translated", fallback: null,  output: "translated", useCaseName: "translateByKeyWithFallback returns translation (fallback is null)" }
  ].forEach((testCase, index) => {
    it(`${testCase.useCaseName}`, () => {
      utilsService = TestBed.inject(Utils);
      configServiceSpy = TestBed.inject(ConfigService) as jasmine.SpyObj<ConfigService>;
      translateServiceSpy = TestBed.inject(TranslateService) as jasmine.SpyObj<TranslateService>;    

      translateServiceSpy.instant.and.returnValue(testCase.translatedText);

      expect(utilsService.translateByKeyWithFallback(testCase.translateKey, testCase.fallback)).toEqual(testCase.output);
    })
  });
});