import { describe, expect, it, beforeEach, vi } from 'vitest';
import {
  PushNotifier,
  pushNotificationForEvent,
  type PushNotificationSettings,
} from '../src/services/push-notifier.js';
import type { RealtimeEvent, RealtimeEventMap, RealtimeEventType } from '../src/web/events/event-types.js';
import { createMockLogger, getLogsByLevel } from './mockLogger.js';

interface RecordedRequest {
  url: string;
  init: RequestInit;
}

function settings(overrides: Partial<PushNotificationSettings> = {}): PushNotificationSettings {
  return {
    enabled: true,
    serverUrl: 'https://ntfy.example.com',
    topic: 'redditbot-test',
    priority: 'default',
    events: {
      imageReceived: true,
      replyReceived: true,
      messageFailed: true,
      botStopped: true,
      rateLimited: true,
      sessionExpired: true,
      syncFailed: true,
    },
    ...overrides,
  };
}

function event<TType extends RealtimeEventType>(
  type: TType,
  payload: RealtimeEventMap[TType],
  occurredAt = '2026-08-10T12:00:00.000Z',
): RealtimeEvent {
  return { id: `${type}-1`, occurredAt, type, payload } as RealtimeEvent;
}

class FakeHub {
  listener: ((event: RealtimeEvent) => void) | null = null;
  unsubscribed = false;

  subscribe(listener: (event: RealtimeEvent) => void) {
    this.listener = listener;
    return { unsubscribe: () => { this.unsubscribed = true; this.listener = null; } };
  }

  emit(value: RealtimeEvent): void {
    this.listener?.(value);
  }
}

describe('pushNotificationForEvent', () => {
  it('maps an inbound image onto the imageReceived notification', () => {
    expect(pushNotificationForEvent(event('media.received', {
      conversationId: 'room-1',
      sender: 'alice',
      count: 2,
    }))).toMatchObject({
      event: 'imageReceived',
      title: 'Image from u/alice',
      body: '2 images are attached to the conversation.',
    });
  });

  it('only notifies for the actionable side of two-way status events', () => {
    expect(pushNotificationForEvent(event('bot.status.changed', { status: 'running', dryRun: false }))).toBeNull();
    expect(pushNotificationForEvent(event('bot.status.changed', { status: 'stopped', dryRun: false })))
      .toMatchObject({ event: 'botStopped' });
    expect(pushNotificationForEvent(event('rate-limit.changed', { limited: false }))).toBeNull();
    expect(pushNotificationForEvent(event('rate-limit.changed', { limited: true })))
      .toMatchObject({ event: 'rateLimited' });
    expect(pushNotificationForEvent(event('reddit.session.changed', { status: 'authenticated' }))).toBeNull();
    expect(pushNotificationForEvent(event('reddit.session.changed', { status: 'expired' })))
      .toMatchObject({ event: 'sessionExpired', priority: 'high' });
  });

  it('ignores events that are not worth a phone notification', () => {
    expect(pushNotificationForEvent(event('log.created', { level: 'error', message: 'boom' }))).toBeNull();
    expect(pushNotificationForEvent(event('sync.progress', { syncId: 's1', kind: 'full', completed: 3 }))).toBeNull();
    expect(pushNotificationForEvent(event('message.sent', { messageId: 'm1', recipient: 'alice' }))).toBeNull();
  });
});

describe('PushNotifier', () => {
  let requests: RecordedRequest[];
  let response: { ok: boolean; status: number; statusText: string };
  let fetcher: (url: string, init: RequestInit) => Promise<typeof response>;

  beforeEach(() => {
    requests = [];
    response = { ok: true, status: 200, statusText: 'OK' };
    fetcher = (url, init) => {
      requests.push({ url, init });
      return Promise.resolve(response);
    };
  });

  it('posts the notification to the configured topic', async () => {
    const notifier = new PushNotifier(() => settings(), createMockLogger(), fetcher);

    const result = await notifier.publish({
      event: 'imageReceived',
      title: 'Image from u/alice',
      body: 'An image is attached.',
      tags: ['camera'],
    });

    expect(result).toEqual({ delivered: true });
    expect(requests).toHaveLength(1);
    expect(requests[0].url).toBe('https://ntfy.example.com/redditbot-test');
    expect(requests[0].init.method).toBe('POST');
    expect(requests[0].init.body).toBe('An image is attached.');
    const headers = requests[0].init.headers as Record<string, string>;
    expect(headers.Title).toBe('Image from u/alice');
    expect(headers.Priority).toBe('default');
    expect(headers.Tags).toBe('camera');
    expect(headers.Authorization).toBeUndefined();
  });

  it('tolerates a trailing slash on the server URL and sends the access token when set', async () => {
    const notifier = new PushNotifier(
      () => settings({ serverUrl: 'https://ntfy.example.com/', authToken: 'tk_secret' }),
      createMockLogger(),
      fetcher,
    );

    await notifier.publish({ event: 'imageReceived', title: 'Hi', body: 'There', tags: [] });

    expect(requests[0].url).toBe('https://ntfy.example.com/redditbot-test');
    expect((requests[0].init.headers as Record<string, string>).Authorization).toBe('Bearer tk_secret');
  });

  it('sends nothing when disabled, unselected, or missing a topic', async () => {
    const disabled = new PushNotifier(() => settings({ enabled: false }), createMockLogger(), fetcher);
    const unselected = new PushNotifier(
      () => settings({ events: { ...settings().events, imageReceived: false } }),
      createMockLogger(),
      fetcher,
    );
    const topicless = new PushNotifier(() => settings({ topic: '  ' }), createMockLogger(), fetcher);
    const draft = { event: 'imageReceived', title: 'Hi', body: 'There', tags: [] } as const;

    expect(await disabled.publish({ ...draft })).toMatchObject({ delivered: false });
    expect(await unselected.publish({ ...draft })).toMatchObject({ delivered: false });
    expect(await topicless.publish({ ...draft })).toMatchObject({ delivered: false });
    expect(requests).toHaveLength(0);
  });

  it('reports a rejected or unreachable server without throwing', async () => {
    const logger = createMockLogger();
    response = { ok: false, status: 403, statusText: 'Forbidden' };
    const rejecting = new PushNotifier(() => settings(), logger, fetcher);
    expect(await rejecting.publish({ event: 'imageReceived', title: 'Hi', body: 'There', tags: [] }))
      .toEqual({ delivered: false, reason: 'ntfy responded 403 Forbidden' });

    const unreachable = new PushNotifier(() => settings(), logger, () => Promise.reject(new Error('ECONNREFUSED')));
    expect(await unreachable.publish({ event: 'imageReceived', title: 'Hi', body: 'There', tags: [] }))
      .toEqual({ delivered: false, reason: 'ECONNREFUSED' });
    expect(getLogsByLevel(logger, 'warn')).toHaveLength(2);
  });

  it('strips newlines from the title so the header cannot be split', async () => {
    const notifier = new PushNotifier(() => settings(), createMockLogger(), fetcher);

    await notifier.publish({
      event: 'replyReceived',
      title: 'Reply from u/alice\r\nX-Injected: yes',
      body: 'hello',
      tags: [],
    });

    expect((requests[0].init.headers as Record<string, string>).Title)
      .toBe('Reply from u/alice X-Injected: yes');
  });

  it('sends selected hub events and skips the ones the operator turned off', async () => {
    const hub = new FakeHub();
    const notifier = new PushNotifier(
      () => settings({ events: { ...settings().events, replyReceived: false } }),
      createMockLogger(),
      fetcher,
      () => Date.parse('2026-08-10T11:00:00.000Z'),
    );
    notifier.attach(hub);

    hub.emit(event('media.received', { conversationId: 'room-1', sender: 'alice', count: 1 }));
    hub.emit(event('reply.received', { conversationId: 'room-1', replyId: 'r1', sender: 'alice' }));
    await vi.waitFor(() => expect(requests).toHaveLength(1));

    expect((requests[0].init.headers as Record<string, string>).Title).toBe('Image from u/alice');
  });

  it('skips buffered events the hub replays from before it attached', async () => {
    const hub = new FakeHub();
    const notifier = new PushNotifier(
      () => settings(),
      createMockLogger(),
      fetcher,
      () => Date.parse('2026-08-10T12:00:00.000Z'),
    );
    notifier.attach(hub);

    hub.emit(event('media.received', { conversationId: 'old', sender: 'alice', count: 1 }, '2026-08-10T11:59:59.000Z'));
    hub.emit(event('media.received', { conversationId: 'new', sender: 'bob', count: 1 }, '2026-08-10T12:00:01.000Z'));
    await vi.waitFor(() => expect(requests).toHaveLength(1));

    expect((requests[0].init.headers as Record<string, string>).Title).toBe('Image from u/bob');
  });

  it('sends a test notification even when no event is selected, but not when disabled', async () => {
    const noEvents = Object.fromEntries(
      Object.keys(settings().events).map((key) => [key, false]),
    ) as PushNotificationSettings['events'];
    const notifier = new PushNotifier(() => settings({ events: noEvents }), createMockLogger(), fetcher);

    expect(await notifier.sendTest()).toEqual({ delivered: true });
    expect(requests).toHaveLength(1);

    const disabled = new PushNotifier(() => settings({ enabled: false }), createMockLogger(), fetcher);
    expect(await disabled.sendTest()).toMatchObject({ delivered: false });
    expect(requests).toHaveLength(1);
  });

  it('stops delivering once detached', async () => {
    const hub = new FakeHub();
    const notifier = new PushNotifier(() => settings(), createMockLogger(), fetcher, () => 0);
    notifier.attach(hub);
    notifier.detach();

    expect(hub.unsubscribed).toBe(true);
    hub.emit(event('media.received', { conversationId: 'room-1', sender: 'alice', count: 1 }));
    await Promise.resolve();
    expect(requests).toHaveLength(0);
  });
});