import {
  BadGatewayException,
  BadRequestException,
  ConflictException,
  HttpException,
} from '@nestjs/common';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { forTenant } from '../prisma/prisma-tenant.extension';
import { BugReportsService } from './bug-reports.service';

/**
 * BugReportsService.spec — NEU (quick-260914-m97, Fehler-melden-Knopf).
 *
 * Zehn Tests, darunter die vier Falsifizierungen des Plans:
 *   (a) Drossel: der sechste Bericht in zehn Minuten -> 429, nach dem
 *       Fenster (Fake-Timer) wieder durch;
 *   (b) manipulierte Bilddatei ohne PNG-Kopf -> 400, nie versendet;
 *   (c) weder Feld noch Umgebungsvariable -> 409, Leerstring zaehlt als
 *       ungesetzt, nie versendet;
 *   (d) Fremdfelder im Rumpf (tenantId/userId) aendern NICHTS an der
 *       Mandantenkennung — Empfaenger, Benutzerzeile und Versand laufen
 *       ausschliesslich mit der Kennung aus dem Sitzungsnachweis.
 * Test 9 und 10 (quick-260918-gza): Betreff-Kuerzel und Zeile `Herkunft:`
 * fuer den Desktop- und den Browser-Pfad, Protokollzeile mit Kuerzel.
 *
 * `forTenant` wird wie in `user.controller.spec.ts` durch einen gebundenen
 * Fake-Klienten ersetzt, der nur Zeilen des eigenen Mandanten liefert;
 * `nodemailer` kommt hier nicht vor — der Versand ist eine Attrappe von
 * `MailService.sendBugReport`, dessen Verhalten `mail.service.spec.ts` pinnt.
 */
vi.mock('../prisma/prisma-tenant.extension', () => ({
  forTenant: vi.fn((prisma: any, tenantId: string) => prisma.__makeBoundClient(tenantId)),
}));

const PNG_1x1 = Buffer.from(
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==',
  'base64',
);

const sessionUser = { id: 'u1', username: 'anna', role: 'USER', tenantId: 't1' };

const baseDto = {
  page: '/admin/users?tab=x',
  description: 'Knopf tut nichts',
  webVersion: 'v1.2.3',
  webChannel: 'beta',
  webCommit: 'abc1234',
  userAgent: 'UA',
  viewport: '1920x1080',
  clientTime: '2026-09-14T10:00:00.000Z',
  errors: ['[2026-09-14T09:59:00.000Z] fetch: GET /modules -> 500 {"statusCode":500}'],
};

interface FakeUserRow {
  id: string;
  tenantId: string;
  username: string;
  displayName: string | null;
  email: string | null;
  role: string;
}

function makeFakePrisma(rows: FakeUserRow[]) {
  const users = new Map(rows.map((r) => [`${r.tenantId}/${r.id}`, { ...r }]));
  const boundCalls: { tenantId: string; method: string }[] = [];
  return {
    __boundCalls: boundCalls,
    __makeBoundClient(tenantId: string) {
      return {
        user: {
          findUnique: async ({ where, select }: any) => {
            boundCalls.push({ tenantId, method: 'findUnique' });
            const row = users.get(`${tenantId}/${where.id}`);
            if (!row) return null;
            const out: any = {};
            for (const key of Object.keys(select ?? {})) if (select[key]) out[key] = (row as any)[key];
            return out;
          },
        },
      };
    },
  };
}

function makeService(opts: {
  recipient?: string | null;
  env?: string | undefined;
  rows?: FakeUserRow[];
  sendImpl?: () => Promise<void>;
}) {
  const prisma = makeFakePrisma(
    opts.rows ?? [
      { id: 'u1', tenantId: 't1', username: 'anna', displayName: 'Anna Muster', email: 'anna@a.example.invalid', role: 'USER' },
    ],
  );
  const settingsService = {
    getBugReportRecipient: vi.fn(async () => (opts.recipient === undefined ? 'fehler@a.example.invalid' : opts.recipient)),
  };
  const mailService = {
    sendBugReport: vi.fn(opts.sendImpl ?? (async () => undefined)),
  };
  const configService = {
    get: vi.fn((key: string) => (key === 'TESSERA_BUGREPORT_TO' ? opts.env : undefined)),
  };
  const service = new BugReportsService(
    settingsService as any,
    mailService as any,
    configService as any,
    prisma as any,
  );
  vi.spyOn((service as any).logger, 'log').mockImplementation(() => undefined);
  vi.spyOn((service as any).logger, 'error').mockImplementation(() => undefined);
  return { service, prisma, settingsService, mailService, configService };
}

const pngFile = () => ({ buffer: PNG_1x1, size: PNG_1x1.length, mimetype: 'image/png' });

beforeEach(() => {
  vi.stubEnv('APP_VERSION', 'v9.9.9');
  vi.stubEnv('APP_CHANNEL', 'live');
  vi.stubEnv('APP_COMMIT', '');
});

afterEach(() => {
  vi.unstubAllEnvs();
  vi.mocked(forTenant).mockClear();
});

describe('BugReportsService (quick-260914-m97)', () => {
  it('Test 1: Happy Path mit Bild — Betreff, Textrumpf mit allen Kontextzeilen aus Sitzung, Datenbankzeile und Umgebung, PNG-Anhang unveraendert, { sent: true }', async () => {
    const { service, mailService } = makeService({});

    const result = await service.submit(sessionUser, baseDto as any, pngFile());

    expect(result).toEqual({ sent: true });
    expect(mailService.sendBugReport).toHaveBeenCalledTimes(1);
    const [tenantId, to, report] = mailService.sendBugReport.mock.calls[0] as any[];
    expect(tenantId).toBe('t1');
    expect(to).toBe('fehler@a.example.invalid');
    expect(report.subject).toBe('[Tessera Fehlermeldung] [Browser] v1.2.3 beta - /admin/users?tab=x');
    for (const needle of [
      'Knopf tut nichts',
      '/admin/users?tab=x',
      'Anna Muster (anna)',
      'USER',
      'anna@a.example.invalid',
      't1',
      'v1.2.3 (beta) abc1234',
      'Tessera API v9.9.9 (live)',
      'Herkunft: Browser — unbekannt auf unbekannt',
      'UA',
      '1920x1080',
      '[2026-09-14T09:59:00.000Z] fetch: GET /modules -> 500 {"statusCode":500}',
      'Bildschirmfoto: im Anhang',
    ]) {
      expect(report.text, `Text ohne "${needle}"`).toContain(needle);
    }
    expect(report.attachments).toHaveLength(1);
    expect(report.attachments[0].filename).toMatch(/^fehlermeldung-\d{8}-\d{4}\.png$/);
    expect(report.attachments[0].contentType).toBe('image/png');
    expect(report.attachments[0].content.equals(PNG_1x1)).toBe(true);
  });

  it('Test 2: ohne Bild -> leere Anhangsliste, Text nennt "nicht beigefügt"; ohne Beschreibung steht "(keine Beschreibung)"', async () => {
    const { service, mailService } = makeService({});

    await service.submit(sessionUser, { ...baseDto, description: undefined } as any, undefined);

    const report = (mailService.sendBugReport.mock.calls[0] as any[])[2];
    expect(Array.isArray(report.attachments)).toBe(true);
    expect(report.attachments).toHaveLength(0);
    expect(report.text).toContain('Bildschirmfoto: nicht beigefügt');
    expect(report.text).toContain('(keine Beschreibung)');
  });

  it('Test 3 (Falsifizierung a): fuenf Berichte gelingen, der sechste -> 429; anderer Benutzer gleichzeitig frei; nach 10 Minuten wieder frei', async () => {
    vi.useFakeTimers();
    try {
      const { service, mailService } = makeService({});

      for (let i = 0; i < 5; i++) {
        await service.submit(sessionUser, baseDto as any, undefined);
      }
      let caught: unknown;
      try {
        await service.submit(sessionUser, baseDto as any, undefined);
      } catch (e) {
        caught = e;
      }
      expect(caught).toBeInstanceOf(HttpException);
      expect((caught as HttpException).getStatus()).toBe(429);
      expect(mailService.sendBugReport).toHaveBeenCalledTimes(5);

      await expect(
        service.submit({ ...sessionUser, id: 'u2', username: 'bert' }, baseDto as any, undefined),
      ).resolves.toEqual({ sent: true });
      expect(mailService.sendBugReport).toHaveBeenCalledTimes(6);

      vi.advanceTimersByTime(600_001);
      await expect(service.submit(sessionUser, baseDto as any, undefined)).resolves.toEqual({ sent: true });
      expect(mailService.sendBugReport).toHaveBeenCalledTimes(7);
    } finally {
      vi.useRealTimers();
    }
  });

  it('Test 4 (Falsifizierung b): Datei ohne PNG-Kopf -> 400, sendBugReport nie gerufen; auch ein Buffer aus nur 7 PNG-Bytes -> 400', async () => {
    const { service, mailService } = makeService({});

    const fake = Buffer.from('nicht png, aber lang genug');
    await expect(
      service.submit(sessionUser, baseDto as any, { buffer: fake, size: fake.length, mimetype: 'image/png' }),
    ).rejects.toBeInstanceOf(BadRequestException);

    const short = PNG_1x1.subarray(0, 7);
    await expect(
      service.submit(sessionUser, baseDto as any, { buffer: short, size: short.length, mimetype: 'image/png' }),
    ).rejects.toBeInstanceOf(BadRequestException);

    expect(mailService.sendBugReport).not.toHaveBeenCalled();
  });

  it('Test 5 (Falsifizierung c): weder Feld noch Variable -> 409 mit Hinweis auf "Fehlermeldungen an"; Leerstring in der Variable zaehlt als ungesetzt; nie versendet', async () => {
    const a = makeService({ recipient: null, env: undefined });
    let caught: unknown;
    try {
      await a.service.submit(sessionUser, baseDto as any, pngFile());
    } catch (e) {
      caught = e;
    }
    expect(caught).toBeInstanceOf(ConflictException);
    expect((caught as ConflictException).message).toContain('Fehlermeldungen an');
    expect(a.mailService.sendBugReport).not.toHaveBeenCalled();

    const b = makeService({ recipient: null, env: '' });
    await expect(b.service.submit(sessionUser, baseDto as any, pngFile())).rejects.toBeInstanceOf(ConflictException);
    expect(b.mailService.sendBugReport).not.toHaveBeenCalled();
  });

  it('Test 6: Umgebungs-Rueckfall TESSERA_BUGREPORT_TO greift ohne Feld; mit Feld UND Variable gewinnt das Feld', async () => {
    const a = makeService({ recipient: null, env: 'ops@a.example.invalid' });
    await a.service.submit(sessionUser, baseDto as any, undefined);
    expect((a.mailService.sendBugReport.mock.calls[0] as any[])[1]).toBe('ops@a.example.invalid');

    const b = makeService({ recipient: 'fehler@a.example.invalid', env: 'ops@a.example.invalid' });
    await b.service.submit(sessionUser, baseDto as any, undefined);
    expect((b.mailService.sendBugReport.mock.calls[0] as any[])[1]).toBe('fehler@a.example.invalid');
  });

  it('Test 7: Versandfehler -> 502 "E-Mail konnte nicht gesendet werden"; der Versuch zaehlt in der Drossel, sperrt aber nicht', async () => {
    let calls = 0;
    const { service, mailService } = makeService({
      sendImpl: async () => {
        calls += 1;
        if (calls === 1) throw new Error('ECONNREFUSED');
      },
    });

    let caught: unknown;
    try {
      await service.submit(sessionUser, baseDto as any, pngFile());
    } catch (e) {
      caught = e;
    }
    expect(caught).toBeInstanceOf(BadGatewayException);
    expect((caught as BadGatewayException).message).toContain('E-Mail konnte nicht gesendet werden');

    await expect(service.submit(sessionUser, baseDto as any, pngFile())).resolves.toEqual({ sent: true });
    expect(mailService.sendBugReport).toHaveBeenCalledTimes(2);
  });

  it('Test 8 (Falsifizierung d): Fremdfelder tenantId/userId im Rumpf aendern nichts — Empfaenger, forTenant und Versand laufen mit der Sitzungskennung t1, die fremde Zeile taucht nicht auf', async () => {
    const { service, settingsService, mailService } = makeService({
      rows: [
        { id: 'u1', tenantId: 't1', username: 'anna', displayName: 'Anna Muster', email: 'anna@a.example.invalid', role: 'USER' },
        { id: 'u1', tenantId: 'fremd', username: 'anna', displayName: 'Fremde Anna', email: 'fremd@x.invalid', role: 'ADMIN' },
        { id: 'u-fremd', tenantId: 'fremd', username: 'eindringling', displayName: 'Eindringling', email: 'e@x.invalid', role: 'ADMIN' },
      ],
    });

    await service.submit(
      sessionUser,
      { ...baseDto, tenantId: 'fremd', userId: 'u-fremd' } as any,
      undefined,
    );

    expect(settingsService.getBugReportRecipient).toHaveBeenCalledWith('t1');
    expect(vi.mocked(forTenant).mock.calls.every((c) => c[1] === 't1')).toBe(true);
    expect(vi.mocked(forTenant).mock.calls.length).toBeGreaterThan(0);
    const [tenantId, , report] = mailService.sendBugReport.mock.calls[0] as any[];
    expect(tenantId).toBe('t1');
    expect(report.text).toContain('Anna Muster (anna)');
    expect(report.text).not.toContain('Fremde Anna');
    expect(report.text).not.toContain('Eindringling');
    expect(report.text).not.toContain('fremd@x.invalid');
  });

  it('Test 9 (quick-260918-gza): Desktop/Windows — Betreff-Kuerzel, Zeile Herkunft VOR Browser:, Protokollzeile mit Kuerzel', async () => {
    const { service, mailService } = makeService({});
    const edgeUa =
      'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36 Edg/129.0.2792.52';

    await service.submit(
      sessionUser,
      {
        ...baseDto,
        clientKind: 'desktop',
        clientOs: 'windows',
        clientVersion: '1.2.0',
        clientCommit: 'a6d1a64',
        userAgent: edgeUa,
      } as any,
      undefined,
    );

    const report = (mailService.sendBugReport.mock.calls[0] as any[])[2];
    expect(report.subject.startsWith('[Tessera Fehlermeldung] [Desktop/Windows] v1.2.3 beta - ')).toBe(true);
    expect(report.text).toContain('Herkunft: Desktop-App (Windows), Tessera-App 1.2.0 · Stand a6d1a64');
    expect(report.text).toContain('Browser: Mozilla/5.0 (Windows NT 10.0');
    expect(report.text).toContain('Fenster: 1920x1080');
    expect(report.text.indexOf('Herkunft:')).toBeLessThan(report.text.indexOf('Browser:'));

    const { service: freshService, mailService: freshMail } = makeService({});
    freshMail.sendBugReport.mockClear();
    (freshService as any).logger.log.mockClear();
    await freshService.submit(
      sessionUser,
      { ...baseDto, clientKind: 'desktop', clientOs: 'windows', clientVersion: '1.2.0', clientCommit: 'a6d1a64', userAgent: edgeUa } as any,
      undefined,
    );
    expect((freshService as any).logger.log).toHaveBeenCalledTimes(1);
    expect((freshService as any).logger.log.mock.calls[0][0]).toContain('[Desktop/Windows]');
  });

  it('Test 10 (quick-260918-gza): Browser mit echtem User-Agent — Betreff und Zeile Herkunft nennen Browser und Version', async () => {
    const { service, mailService } = makeService({});
    const chromeUa =
      'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36';

    await service.submit(sessionUser, { ...baseDto, clientKind: 'browser', userAgent: chromeUa } as any, undefined);

    const report = (mailService.sendBugReport.mock.calls[0] as any[])[2];
    expect(report.subject).toContain('[Browser]');
    expect(report.text).toContain('Herkunft: Browser — Chrome 129 auf Windows');
  });
});