import { NotFoundException } from '@nestjs/common';
import { beforeEach, describe, expect, it, vi } from 'vitest';

vi.mock('../prisma/prisma-tenant.extension', () => ({
  forTenant: vi.fn((p: unknown) => p),
  forSystem: vi.fn((p: unknown) => p),
}));

import { forTenant } from '../prisma/prisma-tenant.extension';
import { ALERT_MAIL_RETRY_MS, NextcloudAlertService } from './nextcloud-alert.service';
import type { NextcloudRating } from './nextcloud-rating';

const NOW = new Date('2026-10-02T12:30:00Z');
const RED: NextcloudRating = {
  level: 'red',
  reason: 'unreachable',
  updateTo: null,
  eolDate: null,
  cycle: null,
};
const GREEN: NextcloudRating = {
  level: 'green',
  reason: 'current',
  updateTo: null,
  eolDate: null,
  cycle: 35,
};
const ROW = {
  id: 'i1',
  customerName: 'Kunde A',
  baseUrl: 'https://cloud.a.de',
  errorKind: 'network',
  errorDetail: 'ECONNREFUSED',
  alertState: 'ok',
};

function makeService() {
  const prisma = {
    nextcloudInstance: { findFirst: vi.fn(), updateMany: vi.fn() },
    nextcloudAlertSubscription: {
      findMany: vi.fn().mockResolvedValue([]),
      upsert: vi.fn(),
      deleteMany: vi.fn(),
    },
    user: { findMany: vi.fn().mockResolvedValue([]) },
  };
  const mail = { sendNextcloudAlertEmail: vi.fn().mockResolvedValue(true) };
  const settings = { getSmtpConfig: vi.fn().mockResolvedValue({ host: 'smtp.example.invalid' }) };
  const moduleAccess = {
    getModuleAccessLevels: vi.fn().mockResolvedValue(new Map([['mod1', 'USE']])),
  };
  const moduleRegistry = { findBySlug: vi.fn().mockResolvedValue({ id: 'mod1' }) };
  const service = new NextcloudAlertService(
    prisma as never,
    mail as never,
    settings as never,
    moduleAccess as never,
    moduleRegistry as never,
  );
  const sleep = vi.fn().mockResolvedValue(undefined);
  service.sleep = sleep;
  const logSpy = vi.spyOn((service as any).logger, 'log').mockImplementation(() => undefined);
  const warnSpy = vi.spyOn((service as any).logger, 'warn').mockImplementation(() => undefined);
  vi.spyOn((service as any).logger, 'error').mockImplementation(() => undefined);
  return { prisma, mail, settings, moduleAccess, moduleRegistry, service, sleep, logSpy, warnSpy };
}

function withSubscriber(ctx: ReturnType<typeof makeService>, user: Record<string, unknown> = {}) {
  ctx.prisma.nextcloudInstance.updateMany.mockResolvedValue({ count: 1 });
  ctx.prisma.nextcloudAlertSubscription.findMany.mockResolvedValue([{ userId: 'u1' }]);
  ctx.prisma.user.findMany.mockResolvedValue([
    { id: 'u1', email: 'u1@example.invalid', role: 'USER', isActive: true, ...user },
  ]);
}

describe('NextcloudAlertService Abonnements', () => {
  let ctx: ReturnType<typeof makeService>;
  beforeEach(() => {
    vi.mocked(forTenant).mockClear();
    ctx = makeService();
  });

  it('subscribe ist idempotent (upsert) und bindet Benutzer und Mandant ueber den Klienten', async () => {
    ctx.prisma.nextcloudInstance.findFirst.mockResolvedValue({ id: 'i1' });
    expect(await ctx.service.subscribe('t1', 'u1', 'i1')).toEqual({ subscribed: true });
    expect(await ctx.service.subscribe('t1', 'u1', 'i1')).toEqual({ subscribed: true });
    expect(forTenant).toHaveBeenCalledWith(ctx.prisma, 't1', 'u1');
    expect(ctx.prisma.nextcloudInstance.findFirst.mock.calls[0][0].where).toEqual({
      id: 'i1',
      tenantId: 't1',
    });
    const args = ctx.prisma.nextcloudAlertSubscription.upsert.mock.calls[0][0];
    expect(args.where).toEqual({ instanceId_userId: { instanceId: 'i1', userId: 'u1' } });
    expect(args.create).toEqual({ tenantId: 't1', userId: 'u1', instanceId: 'i1' });
    expect(args.update).toEqual({});
  });

  it('subscribe fuer unbekannte oder fremde Cloud -> 404 und keine Zeile', async () => {
    ctx.prisma.nextcloudInstance.findFirst.mockResolvedValue(null);
    await expect(ctx.service.subscribe('t1', 'u1', 'fremd')).rejects.toThrow(NotFoundException);
    expect(ctx.prisma.nextcloudAlertSubscription.upsert).not.toHaveBeenCalled();
  });

  it('unsubscribe loescht nur die Zeile des Aufrufers', async () => {
    expect(await ctx.service.unsubscribe('t1', 'u1', 'i1')).toEqual({ subscribed: false });
    expect(ctx.prisma.nextcloudAlertSubscription.deleteMany).toHaveBeenCalledWith({
      where: { tenantId: 't1', userId: 'u1', instanceId: 'i1' },
    });
  });

  it('subscribedInstanceIds liefert nur die Kennungen des Aufrufers', async () => {
    ctx.prisma.nextcloudAlertSubscription.findMany.mockResolvedValue([
      { instanceId: 'a' },
      { instanceId: 'b' },
    ]);
    const ids = await ctx.service.subscribedInstanceIds('t1', 'u1');
    expect([...ids]).toEqual(['a', 'b']);
    expect(ctx.prisma.nextcloudAlertSubscription.findMany.mock.calls[0][0].where).toEqual({
      tenantId: 't1',
      userId: 'u1',
    });
  });
});

describe('NextcloudAlertService.evaluateAfterCheck', () => {
  let ctx: ReturnType<typeof makeService>;
  beforeEach(() => {
    ctx = makeService();
  });

  it('Anspruch gewonnen (count 1): Mail an den berechtigten Abonnenten, Zustand wird auf rot gesetzt', async () => {
    withSubscriber(ctx);
    const result = await ctx.service.evaluateAfterCheck('t1', ROW, RED, NOW);
    expect(result.kind).toBe('down');
    await result.delivery;
    expect(ctx.prisma.nextcloudInstance.updateMany).toHaveBeenCalledWith({
      where: { id: 'i1', tenantId: 't1', alertState: 'ok' },
      data: { alertState: 'red', alertReason: 'unreachable', alertChangedAt: NOW },
    });
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(1);
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledWith(
      't1',
      'u1@example.invalid',
      expect.objectContaining({ kind: 'down', customerName: 'Kunde A', rating: RED, at: NOW }),
    );
  });

  it('Anspruch verloren (count 0): keine Mail, auch kein Abonnentenlesen', async () => {
    withSubscriber(ctx);
    ctx.prisma.nextcloudInstance.updateMany.mockResolvedValue({ count: 0 });
    const result = await ctx.service.evaluateAfterCheck('t1', ROW, RED, NOW);
    expect(result).toEqual({ kind: null, delivery: null });
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
    expect(ctx.prisma.nextcloudAlertSubscription.findMany).not.toHaveBeenCalled();
  });

  it('rot -> rot: kein Anspruch, keine Mail', async () => {
    const result = await ctx.service.evaluateAfterCheck(
      't1',
      { ...ROW, alertState: 'red' },
      RED,
      NOW,
    );
    expect(result).toEqual({ kind: null, delivery: null });
    expect(ctx.prisma.nextcloudInstance.updateMany).not.toHaveBeenCalled();
  });

  it('gruen -> gruen und grau aendern nichts', async () => {
    await ctx.service.evaluateAfterCheck('t1', ROW, GREEN, NOW);
    await ctx.service.evaluateAfterCheck(
      't1',
      { ...ROW, alertState: 'red' },
      { ...GREEN, level: 'unknown', reason: 'not-checked' },
      NOW,
    );
    expect(ctx.prisma.nextcloudInstance.updateMany).not.toHaveBeenCalled();
  });

  it('rot -> gruen: genau eine "wieder in Ordnung"-Mail, Grund wird geleert', async () => {
    withSubscriber(ctx);
    const result = await ctx.service.evaluateAfterCheck(
      't1',
      { ...ROW, alertState: 'red' },
      GREEN,
      NOW,
    );
    expect(result.kind).toBe('up');
    await result.delivery;
    expect(ctx.prisma.nextcloudInstance.updateMany).toHaveBeenCalledWith({
      where: { id: 'i1', tenantId: 't1', alertState: 'red' },
      data: { alertState: 'ok', alertReason: null, alertChangedAt: NOW },
    });
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(1);
    expect(ctx.mail.sendNextcloudAlertEmail.mock.calls[0][2]).toMatchObject({
      kind: 'up',
      rating: GREEN,
    });
  });

  it('der Pruefpfad wartet nicht auf den Versand (Hintergrund)', async () => {
    withSubscriber(ctx);
    let release!: (v: boolean) => void;
    ctx.mail.sendNextcloudAlertEmail.mockImplementation(
      () => new Promise<boolean>((resolve) => (release = resolve)),
    );
    const result = await ctx.service.evaluateAfterCheck('t1', ROW, RED, NOW);
    expect(result.kind).toBe('down');
    await vi.waitFor(() => expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(1));
    release(true);
    await result.delivery;
  });
});

describe('NextcloudAlertService Empfaenger (L-06)', () => {
  let ctx: ReturnType<typeof makeService>;
  beforeEach(() => {
    ctx = makeService();
  });

  async function run() {
    const result = await ctx.service.evaluateAfterCheck('t1', ROW, RED, NOW);
    await result.delivery;
  }

  it('deaktivierter Benutzer: uebersprungen und protokolliert', async () => {
    withSubscriber(ctx, { isActive: false });
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
    expect(ctx.logSpy.mock.calls.some((c) => String(c[0]).includes('Benutzer deaktiviert'))).toBe(
      true,
    );
  });

  it('ohne E-Mail-Adresse: uebersprungen und protokolliert', async () => {
    withSubscriber(ctx, { email: null });
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
    expect(ctx.logSpy.mock.calls.some((c) => String(c[0]).includes('keine E-Mail-Adresse'))).toBe(
      true,
    );
  });

  it('Modulzugriff inzwischen entzogen: uebersprungen und protokolliert', async () => {
    withSubscriber(ctx);
    ctx.moduleAccess.getModuleAccessLevels.mockResolvedValue(new Map());
    await run();
    expect(ctx.moduleAccess.getModuleAccessLevels).toHaveBeenCalledWith('t1', 'u1', 'USER');
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
    expect(ctx.logSpy.mock.calls.some((c) => String(c[0]).includes('kein Modulzugriff'))).toBe(
      true,
    );
  });

  it('ohne SMTP-Einrichtung: uebersprungen und protokolliert, kein Zugriffs-Lookup', async () => {
    withSubscriber(ctx);
    ctx.settings.getSmtpConfig.mockResolvedValue(null);
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
    expect(
      ctx.logSpy.mock.calls.some((c) => String(c[0]).includes('kein E-Mail-Versand eingerichtet')),
    ).toBe(true);
  });

  it('ein Empfaenger ohne Zugriff haelt den anderen nicht auf', async () => {
    ctx.prisma.nextcloudInstance.updateMany.mockResolvedValue({ count: 1 });
    ctx.prisma.nextcloudAlertSubscription.findMany.mockResolvedValue([
      { userId: 'u1' },
      { userId: 'u2' },
    ]);
    ctx.prisma.user.findMany.mockResolvedValue([
      { id: 'u1', email: 'u1@example.invalid', role: 'USER', isActive: true },
      { id: 'u2', email: 'u2@example.invalid', role: 'ADMIN', isActive: true },
    ]);
    ctx.moduleAccess.getModuleAccessLevels.mockImplementation(async (_t: string, id: string) =>
      id === 'u1' ? new Map() : new Map([['mod1', 'MANAGE']]),
    );
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(1);
    expect(ctx.mail.sendNextcloudAlertEmail.mock.calls[0][1]).toBe('u2@example.invalid');
  });

  it('false, false, dann true: genau drei Aufrufe, je 60 s Abstand', async () => {
    withSubscriber(ctx);
    ctx.mail.sendNextcloudAlertEmail
      .mockResolvedValueOnce(false)
      .mockResolvedValueOnce(false)
      .mockResolvedValueOnce(true);
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(3);
    expect(ctx.sleep).toHaveBeenCalledTimes(2);
    expect(ctx.sleep).toHaveBeenCalledWith(ALERT_MAIL_RETRY_MS);
  });

  it('dreimal false: drei Aufrufe, dann Schluss', async () => {
    withSubscriber(ctx);
    ctx.mail.sendNextcloudAlertEmail.mockResolvedValue(false);
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(3);
    expect(ctx.sleep).toHaveBeenCalledTimes(2);
    expect(ctx.warnSpy).toHaveBeenCalled();
  });

  it('Erfolg beim ersten Versuch: kein Warten, ein Aufruf', async () => {
    withSubscriber(ctx);
    await run();
    expect(ctx.mail.sendNextcloudAlertEmail).toHaveBeenCalledTimes(1);
    expect(ctx.sleep).not.toHaveBeenCalled();
  });

  it('keine Abonnenten: nichts zu tun', async () => {
    ctx.prisma.nextcloudInstance.updateMany.mockResolvedValue({ count: 1 });
    await run();
    expect(ctx.prisma.user.findMany).not.toHaveBeenCalled();
    expect(ctx.mail.sendNextcloudAlertEmail).not.toHaveBeenCalled();
  });
});