import { HttpClient, HttpParams } from '@angular/common/http';
import { Injector, runInInjectionContext } from '@angular/core';
import { Observable } from 'rxjs';
import { ChallengesApiService } from '../../frontend/src/app/features/challenges/challenges.service';
import { ChallengeDetail } from '../../frontend/src/app/features/challenges/challenges.pure';

interface CapturedRequest {
  url: string;
  params: HttpParams;
  withCredentials: boolean;
}

function makeDetail(): ChallengeDetail {
  return {
    challenge: {
      id: 'c1',
      name: 'alpha',
      descriptionMd: '# Alpha',
      categoryId: 'cat1',
      categoryAbbreviation: 'CRY',
      categoryIconPath: '',
      difficulty: 'LOW',
      livePoints: 90,
      solveCount: 1,
      solvedByMe: false,
    },
    solvers: [
      {
        position: 1,
        playerId: 'p1',
        playerName: 'alice',
        solvedAtUtc: '2025-01-01T00:00:00.000Z',
        awardedPoints: 100,
        basePoints: 100,
        rankBonus: 0,
        isFirst: true,
        isSecond: false,
        isThird: false,
      },
    ],
  };
}

class StubHttpClient {
  public captured: CapturedRequest | null = null;

  get<T>(url: string, options: { withCredentials?: boolean; params?: HttpParams | Record<string, string> }): Observable<T> {
    this.captured = {
      url,
      params:
        options.params instanceof HttpParams
          ? options.params
          : new HttpParams({ fromObject: (options.params ?? {}) as Record<string, string> }),
      withCredentials: !!options.withCredentials,
    };
    return new Observable<T>((subscriber) => {
      subscriber.next(makeDetail() as unknown as T);
      subscriber.complete();
    });
  }

  post<T>(_url: string, _body: unknown, _options: unknown): Observable<T> {
    return new Observable<T>();
  }
}

describe('ChallengesApiService.getDetail', () => {
  let http: StubHttpClient;
  let service: ChallengesApiService;

  beforeEach(() => {
    http = new StubHttpClient();
    const injector = Injector.create({
      providers: [
        { provide: HttpClient, useValue: http },
        ChallengesApiService,
      ],
    });
    service = runInInjectionContext(injector, () => injector.get(ChallengesApiService));
  });

  it('requests the challenge detail with include=solvers and withCredentials', (done) => {
    service.getDetail('c1').subscribe(() => {
      try {
        expect(http.captured).not.toBeNull();
        expect(http.captured!.url).toBe('/api/v1/challenges/c1');
        expect(http.captured!.params.get('include')).toBe('solvers');
        expect(http.captured!.withCredentials).toBe(true);
        done();
      } catch (err) {
        done(err);
      }
    });
  });

  it('encodes the challenge id in the URL path', (done) => {
    service.getDetail('c/with spaces').subscribe(() => {
      try {
        expect(http.captured!.url).toBe('/api/v1/challenges/c%2Fwith%20spaces');
        expect(http.captured!.params.get('include')).toBe('solvers');
        done();
      } catch (err) {
        done(err);
      }
    });
  });
});