import { afterEach, describe, expect, it, vi } from 'vitest';
import { cleanup, render } from 'vitest-browser-svelte';
import { page } from 'vitest/browser';
import { goto } from '$app/navigation';
import BulkSelectionBar from './BulkSelectionBar.svelte';
import { bulkSelectionStore } from '$lib/document/bulkSelection.svelte';

vi.mock('$app/navigation', () => ({ goto: vi.fn() }));

afterEach(() => {
	cleanup();
	vi.mocked(goto).mockClear();
	bulkSelectionStore.clear();
});

describe('BulkSelectionBar', () => {
	it('does not render when canWrite is false', async () => {
		bulkSelectionStore.add('a');
		render(BulkSelectionBar, { canWrite: false });
		await expect.element(page.getByTestId('bulk-selection-bar')).not.toBeInTheDocument();
	});

	it('does not render when selection is empty', async () => {
		render(BulkSelectionBar, { canWrite: true });
		await expect.element(page.getByTestId('bulk-selection-bar')).not.toBeInTheDocument();
	});

	it('renders with the current selection count', async () => {
		bulkSelectionStore.add('a');
		bulkSelectionStore.add('b');
		render(BulkSelectionBar, { canWrite: true });
		await expect.element(page.getByTestId('bulk-selection-count')).toHaveTextContent('2');
	});

	it('uses the singular plural form for count=1 (not "1 Dokumente")', async () => {
		bulkSelectionStore.add('only');
		render(BulkSelectionBar, { canWrite: true });
		await expect
			.element(page.getByTestId('bulk-selection-count'))
			.toHaveTextContent('1 Dokument ausgewählt');
	});

	it('uses the plural form for count=2', async () => {
		bulkSelectionStore.add('a');
		bulkSelectionStore.add('b');
		render(BulkSelectionBar, { canWrite: true });
		await expect
			.element(page.getByTestId('bulk-selection-count'))
			.toHaveTextContent('2 Dokumente ausgewählt');
	});

	it('clear button empties the store', async () => {
		bulkSelectionStore.add('a');
		bulkSelectionStore.add('b');
		render(BulkSelectionBar, { canWrite: true });
		await page.getByTestId('bulk-clear-all').click();
		expect(bulkSelectionStore.size).toBe(0);
	});

	it('Massenbearbeitung navigates to /documents/bulk-edit', async () => {
		bulkSelectionStore.add('a');
		render(BulkSelectionBar, { canWrite: true });
		await page.getByTestId('bulk-edit-open').click();
		expect(vi.mocked(goto)).toHaveBeenCalledWith('/documents/bulk-edit');
	});

	it('selection count region announces via aria-live=polite', async () => {
		bulkSelectionStore.add('a');
		render(BulkSelectionBar, { canWrite: true });
		await expect
			.element(page.getByTestId('bulk-selection-count'))
			.toHaveAttribute('aria-live', 'polite');
	});

	it('Escape clears the selection while the bar is visible', async () => {
		bulkSelectionStore.add('a');
		bulkSelectionStore.add('b');
		render(BulkSelectionBar, { canWrite: true });
		window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }));
		await expect.poll(() => bulkSelectionStore.size).toBe(0);
	});

	it('Escape is a no-op when the bar is hidden (no selection)', async () => {
		render(BulkSelectionBar, { canWrite: true });
		window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }));
		// Nothing to clear, no error.
		expect(bulkSelectionStore.size).toBe(0);
	});

	it('Escape does not clear when an open <dialog> is present (Leonie B6 scope guard)', async () => {
		bulkSelectionStore.add('a');
		bulkSelectionStore.add('b');
		render(BulkSelectionBar, { canWrite: true });

		// Simulate a ConfirmDialog being open in front of the bar.
		const overlay = document.createElement('dialog');
		overlay.setAttribute('open', '');
		document.body.appendChild(overlay);
		try {
			window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }));
			// Escape is captured by the dialog, not the bar — selection survives.
			expect(bulkSelectionStore.size).toBe(2);
		} finally {
			overlay.remove();
		}
	});

	it('Escape does not clear when an aria-expanded popover is present', async () => {
		bulkSelectionStore.add('a');
		render(BulkSelectionBar, { canWrite: true });

		const trigger = document.createElement('button');
		trigger.setAttribute('aria-expanded', 'true');
		document.body.appendChild(trigger);
		try {
			window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }));
			expect(bulkSelectionStore.size).toBe(1);
		} finally {
			trigger.remove();
		}
	});
});