import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
import type { Server } from 'bun';
import { createPlugin } from './plugins';

// --- Synthetic ICS ---

const pad = (n: number) => n.toString().padStart(2, '0');
const icsDate = (d: Date) =>
  `${d.getFullYear()}${pad(d.getMonth() + 1)}${pad(d.getDate())}T${pad(d.getHours())}${pad(d.getMinutes())}00`;

const now = new Date();
const currentStart = new Date(now.getTime() - 30 * 60_000);
const currentEnd = new Date(now.getTime() + 30 * 60_000);
const nextStart = new Date(now.getTime() + 60 * 60_000);
const nextEnd = new Date(now.getTime() + 120 * 60_000);
const laterStart = new Date(now.getTime() + 180 * 60_000);
const laterEnd = new Date(now.getTime() + 240 * 60_000);

const ics = `BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Test//Test//EN
BEGIN:VEVENT
DTSTART:${icsDate(currentStart)}
DTEND:${icsDate(currentEnd)}
SUMMARY:Current Meeting
UID:test-current@test
END:VEVENT
BEGIN:VEVENT
DTSTART:${icsDate(nextStart)}
DTEND:${icsDate(nextEnd)}
SUMMARY:Next Meeting
UID:test-next@test
END:VEVENT
BEGIN:VEVENT
DTSTART:${icsDate(laterStart)}
DTEND:${icsDate(laterEnd)}
SUMMARY:Later Meeting
UID:test-later@test
END:VEVENT
END:VCALENDAR`;

const fakeModel = {
  width: 800,
  height: 480,
  css: { classes: { device: 'device', size: 'size', density: 'density' } },
} as any;

// --- ICS server ---

let icsServer: Server;
let icsUrl: string;

beforeAll(() => {
  icsServer = Bun.serve({
    port: 0,
    hostname: '127.0.0.1',
    routes: {
      '/cal.ics': () =>
        new Response(ics, {
          headers: { 'Content-Type': 'text/calendar' },
        }),
    },
  });
  icsUrl = `http://127.0.0.1:${icsServer.port}/cal.ics`;
});

afterAll(() => {
  icsServer.stop();
});

// --- Tests ---

describe('plugin registry', () => {
  test('unknown plugin throws', () => {
    expect(() => createPlugin('nonexistent', {})).toThrow(
      'Unknown plugin: nonexistent'
    );
  });

  test('calendar plugin creates an ICSRenderable', () => {
    const plugin = createPlugin('calendar', { urls: [] });
    expect(plugin.hash).toBe('');
    expect(plugin.nextEvent).toBeUndefined();
  });
});

describe('calendar plugin rendering', () => {
  test('renders events from ICS feed', async () => {
    const plugin = createPlugin('calendar', { urls: [icsUrl] });
    const html = await plugin.render('full', fakeModel);

    expect(html).toContain('Current Meeting');
    expect(html).toContain('Next Meeting');
    expect(html).toContain('Later Meeting');
  });

  test('shows BEZET when there is a current event', async () => {
    const plugin = createPlugin('calendar', { urls: [icsUrl] });
    const html = await plugin.render('full', fakeModel);

    expect(html).toContain('BEZET');
  });

  test('computes hash after render', async () => {
    const plugin = createPlugin('calendar', { urls: [icsUrl] });
    await plugin.render('full', fakeModel);

    expect(plugin.hash).toBeTruthy();
  });

  test('sets nextEvent to upcoming event start', async () => {
    const plugin = createPlugin('calendar', { urls: [icsUrl] });
    await plugin.render('full', fakeModel);

    expect(plugin.nextEvent).toBeInstanceOf(Date);
    const diff = Math.abs(plugin.nextEvent!.getTime() - nextStart.getTime());
    expect(diff).toBeLessThan(120_000);
  });

  test('renders VRIJ with no events', async () => {
    const plugin = createPlugin('calendar', { urls: [] });
    const html = await plugin.render('full', fakeModel);

    expect(html).toContain('VRIJ');
    expect(html).not.toContain('BEZET');
  });
});