import express from 'express';
import type { AddressInfo } from 'node:net';
import { afterEach, describe, expect, it, vi } from 'vitest';
import type { WebContext } from '../../src/web/context.js';
import { createPushNotificationsRouter } from '../../src/web/routes/push-notifications.js';
import { ConfigSchema, type Config } from '../../src/config/index.js';
import type { PushDeliveryResult } from '../../src/services/push-notifier.js';
import { getTestConfig } from '../testUtils.js';

const servers: Array<ReturnType<express.Express['listen']>> = [];

async function request(app: express.Express, path: string, init?: RequestInit): Promise<Response> {
  const server = app.listen(0);
  servers.push(server);
  await new Promise<void>((resolve) => server.once('listening', resolve));
  const { port } = server.address() as AddressInfo;
  return fetch(`http://127.0.0.1:${port}${path}`, init);
}

afterEach(async () => {
  await Promise.all(servers.splice(0).map((server) => new Promise<void>((resolve) => server.close(() => resolve()))));
});

interface HarnessOptions {
  authToken?: string;
  sendTest?: () => Promise<PushDeliveryResult>;
  withNotifier?: boolean;
}

function harness(options: HarnessOptions = {}) {
  // Deep-cloned because zod reuses one default object across parses, so two
  // harnesses would otherwise share the same `pushNotifications` instance.
  const config = structuredClone(ConfigSchema.parse(getTestConfig())) as Config;
  if (options.authToken) config.pushNotifications.authToken = options.authToken;
  const saved: Config[] = [];
  const sendTest = vi.fn(options.sendTest ?? (() => Promise.resolve({ delivered: true })));
  const ctx = {
    config,
    runtimeConfig: config,
    services: {
      configStore: { save: (next: Config) => saved.push(next) },
      ...(options.withNotifier === false ? {} : { pushNotifier: { sendTest } }),
    },
    activity: { push: vi.fn() },
    broadcaster: { push: vi.fn() },
    logger: { error: vi.fn(), info: vi.fn(), warn: vi.fn() },
  } as unknown as WebContext;
  const app = express();
  app.use(express.json());
  app.use('/api', createPushNotificationsRouter(ctx));
  return { app, config, saved, sendTest };
}

function update(app: express.Express, body: unknown): Promise<Response> {
  return request(app, '/api/push-notifications', {
    method: 'PUT',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify(body),
  });
}

describe('push notification settings route', () => {
  it('returns the settings with the image event on by default', async () => {
    const { app } = harness();

    const body = await (await request(app, '/api/push-notifications')).json();

    expect(body).toEqual({
      enabled: false,
      serverUrl: 'https://ntfy.sh',
      topic: '',
      priority: 'default',
      events: {
        imageReceived: true,
        replyReceived: false,
        messageFailed: false,
        botStopped: false,
        rateLimited: false,
        sessionExpired: true,
        syncFailed: false,
      },
      hasAuthToken: false,
    });
  });

  it('never returns the access token, only whether one is configured', async () => {
    const { app } = harness({ authToken: 'tk_secret' });

    const response = await request(app, '/api/push-notifications');
    const text = await response.text();

    expect(text).not.toContain('tk_secret');
    expect(JSON.parse(text).hasAuthToken).toBe(true);
  });

  it('persists an edited selection in place, so the running notifier sees it', async () => {
    const { app, config, saved } = harness();
    const settingsRef = config.pushNotifications;
    const eventsRef = config.pushNotifications.events;

    const response = await update(app, {
      enabled: true,
      serverUrl: 'https://ntfy.example.com',
      topic: 'redditbot-7f3a9c21',
      priority: 'high',
      events: { imageReceived: true, replyReceived: true },
    });

    expect(response.status).toBe(200);
    expect(await response.json()).toMatchObject({
      enabled: true,
      serverUrl: 'https://ntfy.example.com',
      topic: 'redditbot-7f3a9c21',
      priority: 'high',
    });
    // Same object references: the notifier holds this config, not a copy.
    expect(config.pushNotifications).toBe(settingsRef);
    expect(config.pushNotifications.events).toBe(eventsRef);
    expect(config.pushNotifications.events.replyReceived).toBe(true);
    // A partial events payload leaves the unmentioned selections alone.
    expect(config.pushNotifications.events.sessionExpired).toBe(true);
    expect(saved).toHaveLength(1);
  });

  it('rejects an invalid server URL, topic, or unknown field', async () => {
    const { app, saved } = harness();

    expect((await update(app, { serverUrl: 'ftp://ntfy.example.com' })).status).toBe(400);
    expect((await update(app, { topic: 'not a topic!' })).status).toBe(400);
    expect((await update(app, { webhook: 'https://example.com' })).status).toBe(400);
    expect(saved).toHaveLength(0);
  });

  it('refuses to enable notifications without a topic', async () => {
    const { app, config, saved } = harness();

    const response = await update(app, { enabled: true });

    expect(response.status).toBe(400);
    expect((await response.json()).error).toMatch(/topic is required/i);
    expect(config.pushNotifications.enabled).toBe(false);
    expect(saved).toHaveLength(0);
  });

  it('enables notifications when the topic arrives in the same save', async () => {
    const { app, config } = harness();

    const response = await update(app, { enabled: true, topic: 'redditbot-7f3a9c21' });

    expect(response.status).toBe(200);
    expect(config.pushNotifications.enabled).toBe(true);
  });

  it('reports the outcome of a test notification', async () => {
    const { app, sendTest } = harness();
    expect(await (await request(app, '/api/push-notifications/test', { method: 'POST' })).json())
      .toEqual({ delivered: true });
    expect(sendTest).toHaveBeenCalledTimes(1);

    const failing = harness({ sendTest: () => Promise.resolve({ delivered: false, reason: 'ntfy responded 403 Forbidden' }) });
    expect(await (await request(failing.app, '/api/push-notifications/test', { method: 'POST' })).json())
      .toEqual({ delivered: false, reason: 'ntfy responded 403 Forbidden' });
  });

  it('reports unavailable rather than crashing when the notifier is missing', async () => {
    const { app } = harness({ withNotifier: false });

    expect((await request(app, '/api/push-notifications/test', { method: 'POST' })).status).toBe(503);
  });
});