import { createHmac } from 'node:crypto';

import Fastify from 'fastify';
import { afterEach, describe, expect, it } from 'vitest';

import type { WebhookConfig } from '../src/config.js';
import { createNotifier, type NotifierLogger } from '../src/lib/notifications.js';

const silentLog: NotifierLogger = {
  debug: () => {},
  warn: () => {},
};

interface ReceivedCall {
  headers: Record<string, string | string[] | undefined>;
  raw: string;
  body: Record<string, unknown>;
}

interface Receiver {
  url: string;
  calls: ReceivedCall[];
  setStatus: (status: number) => void;
  close: () => Promise<void>;
}

async function startReceiver(): Promise<Receiver> {
  const calls: ReceivedCall[] = [];
  let status = 200;
  const app = Fastify({ logger: false });
  // Corps brut : on vérifie la signature sur les octets exacts reçus.
  app.addContentTypeParser('application/json', { parseAs: 'string' }, (_req, body, done) => {
    done(null, body);
  });
  app.post('/hook', (request, reply) => {
    const raw = request.body as string;
    calls.push({
      headers: request.headers,
      raw,
      body: JSON.parse(raw) as Record<string, unknown>,
    });
    return reply.status(status).send({ ok: status < 400 });
  });
  await app.listen({ port: 0, host: '127.0.0.1' });
  const address = app.server.address();
  if (address === null || typeof address === 'string') {
    await app.close();
    throw new Error('adresse du récepteur inattendue');
  }
  return {
    url: `http://127.0.0.1:${String(address.port)}/hook`,
    calls,
    setStatus: (next: number) => {
      status = next;
    },
    close: () => app.close(),
  };
}

function webhook(url: string, over: Partial<WebhookConfig> = {}): WebhookConfig {
  return { url, events: ['upload', 'error'], headers: {}, timeoutMs: 2000, ...over };
}

const UPLOAD_INPUT = {
  target: 'videos',
  storedName: 'vac/plage/clip.mp4',
  originalName: 'clip.mp4',
  size: 5 * 1024 * 1024,
  mimeType: 'video/mp4',
  user: 'user-123',
  via: 'chunked' as const,
};

let receiver: Receiver;

afterEach(async () => {
  await receiver.close();
});

describe('createNotifier', () => {
  it('POSTe un corps structuré avec résumé lisible sur upload finalisé', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier([webhook(receiver.url)], silentLog);

    notifier.uploadCompleted(UPLOAD_INPUT);
    await notifier.close();

    expect(receiver.calls).toHaveLength(1);
    const call = receiver.calls[0]!;
    expect(call.headers['content-type']).toMatch(/^application\/json/);
    expect(call.headers['x-mediadrop-event']).toBe('upload');
    expect(call.headers['user-agent']).toBe('mediaDrop-webhook');
    expect(call.body).toMatchObject({
      event: 'upload',
      target: 'videos',
      storedName: 'vac/plage/clip.mp4',
      originalName: 'clip.mp4',
      size: 5 * 1024 * 1024,
      mimeType: 'video/mp4',
      user: 'user-123',
      via: 'chunked',
    });
    expect(typeof call.body.timestamp).toBe('string');
    expect(call.body.text).toBe(call.body.content);
    expect(call.body.text).toContain('clip.mp4');
    expect(call.body.text).toContain('5.0 Mo');
  });

  it('envoie un corps `error` avec statut, méthode et chemin', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier([webhook(receiver.url)], silentLog);

    notifier.uploadFailed({
      message: 'Type de média non autorisé : application/zip',
      statusCode: 400,
      method: 'POST',
      path: '/upload',
      target: 'videos',
    });
    await notifier.close();

    expect(receiver.calls[0]!.body).toMatchObject({
      event: 'error',
      message: 'Type de média non autorisé : application/zip',
      statusCode: 400,
      method: 'POST',
      path: '/upload',
      target: 'videos',
    });
    expect(receiver.calls[0]!.headers['x-mediadrop-event']).toBe('error');
  });

  it('respecte le filtre `events` de chaque webhook', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier([webhook(receiver.url, { events: ['error'] })], silentLog);

    notifier.uploadCompleted(UPLOAD_INPUT);
    notifier.uploadFailed({ message: 'boom', statusCode: 500, method: 'PUT', path: '/upload/x/0' });
    await notifier.close();

    expect(receiver.calls).toHaveLength(1);
    expect(receiver.calls[0]!.body.event).toBe('error');
  });

  it('signe le corps avec HMAC-SHA256 quand `secret` est défini', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier([webhook(receiver.url, { secret: 'top-secret' })], silentLog);

    notifier.uploadCompleted(UPLOAD_INPUT);
    await notifier.close();

    const call = receiver.calls[0]!;
    const expected = 'sha256=' + createHmac('sha256', 'top-secret').update(call.raw).digest('hex');
    expect(call.headers['x-mediadrop-signature']).toBe(expected);
  });

  it('transmet les en-têtes personnalisés', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier(
      [webhook(receiver.url, { headers: { authorization: 'Bearer jeton', 'x-src': 'md' } })],
      silentLog,
    );

    notifier.uploadCompleted(UPLOAD_INPUT);
    await notifier.close();

    expect(receiver.calls[0]!.headers.authorization).toBe('Bearer jeton');
    expect(receiver.calls[0]!.headers['x-src']).toBe('md');
  });

  it('réessaie une fois sur 5xx puis abandonne sans lever', async () => {
    receiver = await startReceiver();
    receiver.setStatus(503);
    const notifier = createNotifier([webhook(receiver.url)], silentLog);

    notifier.uploadCompleted(UPLOAD_INPUT);
    await expect(notifier.close()).resolves.toBeUndefined();

    expect(receiver.calls).toHaveLength(2);
  });

  it('ne réessaie pas sur une erreur cliente 4xx', async () => {
    receiver = await startReceiver();
    receiver.setStatus(404);
    const notifier = createNotifier([webhook(receiver.url)], silentLog);

    notifier.uploadCompleted(UPLOAD_INPUT);
    await notifier.close();

    expect(receiver.calls).toHaveLength(1);
  });

  it('livre à plusieurs webhooks en parallèle', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier(
      [webhook(receiver.url), webhook(receiver.url, { headers: { 'x-n': '2' } })],
      silentLog,
    );

    notifier.uploadCompleted(UPLOAD_INPUT);
    await notifier.close();

    expect(receiver.calls).toHaveLength(2);
  });

  it('sans webhook configuré : non-opération, close() résout', async () => {
    receiver = await startReceiver();
    const notifier = createNotifier([], silentLog);

    expect(() => {
      notifier.uploadCompleted(UPLOAD_INPUT);
      notifier.uploadFailed({ message: 'x', statusCode: 500, method: 'POST', path: '/upload' });
    }).not.toThrow();
    await expect(notifier.close()).resolves.toBeUndefined();
    expect(receiver.calls).toHaveLength(0);
  });
});