import { act, fireEvent, render, screen } from '@testing-library/react';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import type { ChainLink, ScoreBreakdown } from '@/types';
import ShareableResult from './ShareableResult';

const SCORE: ScoreBreakdown = {
  baseScore: 1000,
  chainLength: 5,
  linkCount: 2,
  chainLengthBonus: 800,
  timeBonus: 500,
  obscurityBonus: 100,
  hintPenalty: 0,
  duplicatePenalty: 0,
  elapsedSeconds: 125,
  totalScore: 2400,
};

const CHAIN: ChainLink[] = [
  { type: 'movie', id: 100, title: 'Movie A', posterPath: null, releaseDate: '2000-01-01', popularity: 5 },
  { type: 'actor', id: 1, name: 'Actor One', profilePath: null, popularity: 5 },
  { type: 'movie', id: 200, title: 'Movie B', posterPath: null, releaseDate: '2001-01-01', popularity: 5 },
];

function baseProps() {
  return {
    score: SCORE,
    chain: CHAIN,
    movieATitle: 'Movie A',
    movieBTitle: 'Movie B',
    movieAReleaseDate: '2000-01-01',
    movieBReleaseDate: '2001-01-01',
  };
}

/** Lets a click handler's own promise chain (clipboard/share calls) settle. */
async function clickAndSettle(button: HTMLElement) {
  await act(async () => {
    fireEvent.click(button);
    await Promise.resolve();
    await Promise.resolve();
    await Promise.resolve();
  });
}

let writeText: ReturnType<typeof vi.fn>;

beforeEach(() => {
  vi.useFakeTimers();
  writeText = vi.fn().mockResolvedValue(undefined);
  Object.defineProperty(navigator, 'clipboard', {
    configurable: true,
    value: { writeText },
  });
});

afterEach(() => {
  vi.useRealTimers();
  Reflect.deleteProperty(navigator, 'clipboard');
  Reflect.deleteProperty(navigator, 'share');
});

describe('ShareableResult', () => {
  it('copies the generated share text to the clipboard', async () => {
    render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );

    expect(writeText).toHaveBeenCalledTimes(1);
    const text = writeText.mock.calls[0]?.[0] as string;
    expect(text).toContain('Movie A (2000) <-> Movie B (2001)');
    expect(text).toContain('Score: 2,400');
    expect(text).toContain('Chain: 1 links');
    expect(text).toContain('Time: 2:05');
  });

  it('confirms the copy, then reverts the label after two seconds', async () => {
    render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    expect(
      screen.getByRole('button', { name: /^Copied$/ }),
    ).toBeInTheDocument();

    await act(async () => {
      vi.advanceTimersByTime(2000);
    });
    expect(
      screen.getByRole('button', { name: /Copy result/ }),
    ).toBeInTheDocument();
  });

  it('labels the mode in the share text for a daily challenge and a versus match', async () => {
    const { rerender } = render(
      <ShareableResult {...baseProps()} mode={{ type: 'daily', date: '2024-01-01' }} />,
    );
    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    expect(writeText.mock.calls[0]?.[0]).toContain('Daily challenge');
    expect(writeText.mock.calls[0]?.[0]).toContain('/daily');

    rerender(
      <ShareableResult
        {...baseProps()}
        mode={{ type: 'versus', matchId: 'm1' }}
      />,
    );
    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    expect(writeText.mock.calls[1]?.[0]).toContain('Versus');
    expect(writeText.mock.calls[1]?.[0]).toContain('/versus/m1');
  });

  it('links to plain versus play when no match id is given', async () => {
    render(<ShareableResult {...baseProps()} mode={{ type: 'versus' }} />);
    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    expect(writeText.mock.calls[0]?.[0]).toMatch(/\/versus$/);
  });

  it('omits a mode label and years the source omits', async () => {
    render(
      <ShareableResult
        {...baseProps()}
        movieAReleaseDate={null}
        movieBReleaseDate={undefined}
        mode={{ type: 'freeplay' }}
      />,
    );
    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    const text = writeText.mock.calls[0]?.[0] as string;
    expect(text).toContain('Movie A <-> Movie B');
    expect(text).not.toMatch(/\u{1F3AF}/u);
  });

  it('does not crash when the clipboard API rejects', async () => {
    writeText.mockRejectedValue(new Error('denied'));
    render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );

    expect(
      screen.getByRole('button', { name: /Copy result/ }),
    ).toBeInTheDocument();
  });

  it('clears its pending reset timer on unmount, so it never sets state after unmounting', async () => {
    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined);
    const { unmount } = render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(
      screen.getByRole('button', { name: /Copy result|Copied/ }),
    );
    unmount();

    await act(async () => {
      vi.advanceTimersByTime(2000);
    });
    expect(errorSpy).not.toHaveBeenCalled();
    errorSpy.mockRestore();
  });

  it('offers no Share button when the browser has no Web Share API', () => {
    render(<ShareableResult {...baseProps()} />);
    expect(screen.queryByRole('button', { name: /Share/ })).toBeNull();
  });

  it('shares via the Web Share API when available', async () => {
    const share = vi.fn().mockResolvedValue(undefined);
    Object.defineProperty(navigator, 'share', { configurable: true, value: share });
    render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(screen.getByRole('button', { name: 'Share' }));

    expect(share).toHaveBeenCalledTimes(1);
    const arg = share.mock.calls[0]?.[0] as { text: string };
    expect(arg.text).toContain('Score: 2,400');
    expect(writeText).not.toHaveBeenCalled();
  });

  it('swallows a cancelled share without falling back to the clipboard', async () => {
    const share = vi.fn().mockRejectedValue(new Error('cancelled'));
    Object.defineProperty(navigator, 'share', { configurable: true, value: share });
    render(<ShareableResult {...baseProps()} />);

    await clickAndSettle(screen.getByRole('button', { name: 'Share' }));

    expect(share).toHaveBeenCalledTimes(1);
    expect(writeText).not.toHaveBeenCalled();
  });

  it('falls back to copying when share becomes unavailable between render and click', async () => {
    // Synthetic: the Share button's visibility and handleShare's own check
    // both read `navigator.share` fresh, so this is the only way to exercise
    // the handler's non-Web-Share fallback branch through the UI - the button
    // is only rendered at all while `navigator.share` is a function.
    let available = true;
    const share = vi.fn();
    Object.defineProperty(navigator, 'share', {
      configurable: true,
      get: () => (available ? share : undefined),
    });
    render(<ShareableResult {...baseProps()} />);

    const shareButton = screen.getByRole('button', { name: 'Share' });
    available = false;
    await clickAndSettle(shareButton);

    expect(share).not.toHaveBeenCalled();
    expect(writeText).toHaveBeenCalledTimes(1);
  });
});