// @vitest-environment happy-dom
import { beforeEach, describe, expect, it, vi } from 'vitest';

import { VideoPanel, type VariantsPort } from '../../src/content/video-panel.js';
import type { MediaVariant } from '../../src/shared/protocol/index.js';

function variant(over: Partial<MediaVariant> = {}): MediaVariant {
  return { variantId: 'v1', kind: 'muxed', drm: false, ...over };
}

describe('VideoPanel', () => {
  beforeEach(() => {
    document.body.innerHTML = '';
  });

  it('renders a button and an initially-hidden menu', () => {
    const port: VariantsPort = { listVariants: vi.fn(), addVariant: vi.fn() };
    const panel = new VideoPanel(port);
    panel.show('https://cdn.example/m.m3u8');

    const button = document.querySelector('#velox-video-panel button')!;
    expect(button.textContent).toBe('Download this video ▾');
    expect((document.querySelector('#velox-video-panel ul') as HTMLUListElement).hidden).toBe(true);
  });

  it('lists variants on click, skipping the daemon\'s manifest parsing entirely', async () => {
    const listVariants = vi.fn(async () => ({
      variants: [variant({ variantId: 'v-1080', resolution: '1920x1080' })],
      drmProtected: false,
    }));
    const port: VariantsPort = { listVariants, addVariant: vi.fn() };
    const panel = new VideoPanel(port);
    panel.show('https://cdn.example/m.m3u8');

    document.querySelector('#velox-video-panel button')!.dispatchEvent(new Event('click'));
    await vi.waitFor(() => expect(listVariants).toHaveBeenCalledWith('https://cdn.example/m.m3u8'));
    await new Promise((r) => setTimeout(r, 0));

    const items = document.querySelectorAll('#velox-video-panel li');
    expect(items.length).toBe(1);
    expect(items[0]!.textContent).toContain('1920x1080');
  });

  it('greys out a DRM variant with "Protected content" and does not wire a click handler', async () => {
    const listVariants = vi.fn(async () => ({
      variants: [variant({ variantId: 'v-drm', drm: true, resolution: '1920x1080' })],
      drmProtected: false,
    }));
    const addVariant = vi.fn();
    const panel = new VideoPanel({ listVariants, addVariant });
    panel.show('https://cdn.example/m.m3u8');

    document.querySelector('#velox-video-panel button')!.dispatchEvent(new Event('click'));
    await new Promise((r) => setTimeout(r, 0));

    const item = document.querySelector<HTMLButtonElement>('#velox-video-panel li button')!;
    expect(item.disabled).toBe(true);
    expect(item.textContent).toContain('Protected content');

    item.dispatchEvent(new Event('click'));
    expect(addVariant).not.toHaveBeenCalled();
  });

  it('shows "Protected content" for a wholly DRM-protected manifest', async () => {
    const listVariants = vi.fn(async () => ({ variants: [variant()], drmProtected: true }));
    const panel = new VideoPanel({ listVariants, addVariant: vi.fn() });
    panel.show('https://cdn.example/m.m3u8');

    document.querySelector('#velox-video-panel button')!.dispatchEvent(new Event('click'));
    await new Promise((r) => setTimeout(r, 0));

    expect(document.querySelector('#velox-video-panel li')!.textContent).toBe('Protected content');
  });

  it('calls addVariant when a non-DRM item is clicked', async () => {
    const listVariants = vi.fn(async () => ({ variants: [variant({ variantId: 'v-720' })], drmProtected: false }));
    const addVariant = vi.fn(async () => ({ taskId: 't1' }));
    const panel = new VideoPanel({ listVariants, addVariant });
    panel.show('https://cdn.example/m.m3u8');

    document.querySelector('#velox-video-panel button')!.dispatchEvent(new Event('click'));
    await new Promise((r) => setTimeout(r, 0));
    document.querySelector<HTMLButtonElement>('#velox-video-panel li button')!.dispatchEvent(new Event('click'));

    expect(addVariant).toHaveBeenCalledWith('https://cdn.example/m.m3u8', 'v-720');
  });

  it('surfaces an error from listVariants instead of an empty menu', async () => {
    const listVariants = vi.fn(async () => ({ error: 'refused: not a manifest' }));
    const panel = new VideoPanel({ listVariants, addVariant: vi.fn() });
    panel.show('https://cdn.example/m.m3u8');

    document.querySelector('#velox-video-panel button')!.dispatchEvent(new Event('click'));
    await new Promise((r) => setTimeout(r, 0));

    expect(document.querySelector('#velox-video-panel li')!.textContent).toContain('refused: not a manifest');
  });

  it('show() replaces a previous panel rather than stacking them', () => {
    const port: VariantsPort = { listVariants: vi.fn(), addVariant: vi.fn() };
    const panel = new VideoPanel(port);
    panel.show('https://cdn.example/a.m3u8');
    panel.show('https://cdn.example/b.m3u8');

    expect(document.querySelectorAll('#velox-video-panel')).toHaveLength(1);
  });
});