import { TestBed } from '@angular/core/testing';
import { App } from './app';
import { OAuthService } from 'angular-oauth2-oidc';
import { HttpClient } from '@angular/common/http';
import { of, throwError } from 'rxjs';
import { vi } from 'vitest';

describe('App', () => {
  let mockOAuthService: any;
  let mockHttpClient: any;

  beforeEach(async () => {
    mockOAuthService = {
      hasValidAccessToken: () => false,
      getIdentityClaims: () => null,
      getAccessToken: () => 'mock-token',
      initCodeFlow: vi.fn(),
      revokeTokenAndLogout: vi.fn()
    };

    mockHttpClient = {
      get: () => of('Hello from mocked API!')
    };

    await TestBed.configureTestingModule({
      imports: [App],
      providers: [
        { provide: OAuthService, useValue: mockOAuthService },
        { provide: HttpClient, useValue: mockHttpClient }
      ]
    }).compileComponents();
  });

  it('should create the app', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;
    expect(app).toBeTruthy();
  });

  it('should render title', async () => {
    const fixture = TestBed.createComponent(App);
    await fixture.whenStable();
    const compiled = fixture.nativeElement as HTMLElement;
    expect(compiled.querySelector('h1')?.textContent).toContain('LMNP Organizer');
  });

  it('should return login status based on OAuthService', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;
    
    mockOAuthService.hasValidAccessToken = () => true;
    expect(app.isLoggedIn).toBe(true);

    mockOAuthService.hasValidAccessToken = () => false;
    expect(app.isLoggedIn).toBe(false);
  });

  it('should return username and email from identity claims', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;

    // Default username when no claims
    expect(app.username).toBe('');

    // Custom claims
    mockOAuthService.getIdentityClaims = () => ({
      preferred_username: 'Alice',
      email: 'alice@example.com'
    });

    expect(app.username).toBe('Alice');
    expect(app.email).toBe('alice@example.com');
  });

  it('should invoke OIDC login and logout flows', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;

    const loginSpy = vi.spyOn(mockOAuthService, 'initCodeFlow');
    const logoutSpy = vi.spyOn(mockOAuthService, 'revokeTokenAndLogout');

    app.login();
    expect(loginSpy).toHaveBeenCalled();

    app.logout();
    expect(logoutSpy).toHaveBeenCalled();
  });

  it('should call hello API and set message on success', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;

    app.callHelloApi();
    expect(app.helloMessage()).toBe('Hello from mocked API!');
  });

  it('should call hello API and handle error', () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;

    mockHttpClient.get = () => throwError(() => ({ statusText: 'Unauthorized' }));

    app.callHelloApi();
    expect(app.helloMessage()).toBe('Failed to connect to backend: Unauthorized');
  });

  it('should render logged in state when user is authenticated', async () => {
    const fixture = TestBed.createComponent(App);
    
    // Log in
    mockOAuthService.hasValidAccessToken = () => true;
    mockOAuthService.getIdentityClaims = () => ({
      preferred_username: 'Alice',
      email: 'alice@example.com'
    });

    fixture.detectChanges();
    await fixture.whenStable();

    const compiled = fixture.nativeElement as HTMLElement;
    expect(compiled.querySelector('.user-details h3')?.textContent).toContain('Alice');
    expect(compiled.querySelector('.user-email')?.textContent).toContain('alice@example.com');
  });

  it('should render hello API response when API button is clicked', async () => {
    const fixture = TestBed.createComponent(App);
    const app = fixture.componentInstance;
    
    // Log in
    mockOAuthService.hasValidAccessToken = () => true;
    mockOAuthService.getIdentityClaims = () => ({
      preferred_username: 'Alice',
      email: 'alice@example.com'
    });

    fixture.detectChanges();
    await fixture.whenStable();

    // Click button
    const compiled = fixture.nativeElement as HTMLElement;
    const button = compiled.querySelector('.api-actions button') as HTMLButtonElement;
    button.click();

    fixture.detectChanges();
    await fixture.whenStable();

    // Verify response message is shown
    expect(app.helloMessage()).toBe('Hello from mocked API!');
    fixture.detectChanges();
    expect(compiled.querySelector('.api-response-code')?.textContent).toContain('Hello from mocked API!');
  });
});