import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { cleanup, render } from 'vitest-browser-svelte';
import { page } from 'vitest/browser';

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

import Page from './+page.svelte';

afterEach(() => {
	cleanup();
	vi.useRealTimers();
});

const SEARCH_LABEL = 'Titel, Personen, Tags durchsuchen…';

function makeData(overrides: Record<string, unknown> = {}) {
	return {
		items: [],
		total: 0,
		q: '',
		from: '',
		to: '',
		senderId: '',
		receiverId: '',
		tags: [],
		sort: 'DATE',
		dir: 'desc',
		tagQ: '',
		tagOp: 'AND',
		canWrite: false,
		error: null,
		...overrides
	};
}

// ─── Initial state from server data ───────────────────────────────────────────

describe('documents page — initial state', () => {
	it('pre-fills the search input from data.q', async () => {
		render(Page, { data: makeData({ q: 'Geburtstag' }) });
		await expect
			.element(page.getByRole('textbox', { name: SEARCH_LABEL }))
			.toHaveValue('Geburtstag');
	});

	it('leaves the search input empty when data.q is not set', async () => {
		render(Page, { data: makeData() });
		await expect.element(page.getByRole('textbox', { name: SEARCH_LABEL })).toHaveValue('');
	});
});

// ─── URL building via triggerSearch ───────────────────────────────────────────

describe('documents page — URL building', () => {
	beforeEach(() => vi.useFakeTimers());

	it('calls goto with /documents?q=… after the 500 ms debounce', async () => {
		const { goto } = await import('$app/navigation');
		vi.mocked(goto).mockClear();

		render(Page, { data: makeData() });

		const input = page.getByRole('textbox', { name: SEARCH_LABEL });
		await input.fill('Urlaub');

		expect(goto).not.toHaveBeenCalled();

		vi.advanceTimersByTime(500);

		expect(goto).toHaveBeenCalledOnce();
		const [url] = vi.mocked(goto).mock.calls[0];
		expect(url).toContain('q=Urlaub');
		expect(url).toMatch(/^\/documents\?/);
	});

	it('omits q from the URL when the search field is empty', async () => {
		const { goto } = await import('$app/navigation');
		vi.mocked(goto).mockClear();

		render(Page, { data: makeData() });

		const input = page.getByRole('textbox', { name: SEARCH_LABEL });
		await input.fill('');

		vi.advanceTimersByTime(500);

		const [url] = vi.mocked(goto).mock.calls[0] ?? [''];
		expect(url).not.toContain('q=');
	});

	it('second keystroke within 500 ms cancels the first timer — goto called only once', async () => {
		const { goto } = await import('$app/navigation');
		vi.mocked(goto).mockClear();

		render(Page, { data: makeData() });

		const input = page.getByRole('textbox', { name: SEARCH_LABEL });
		await input.fill('U');
		vi.advanceTimersByTime(200);
		await input.fill('Urlaub');
		vi.advanceTimersByTime(500);

		expect(goto).toHaveBeenCalledOnce();
	});

	it('passes keepFocus and noScroll options to goto', async () => {
		const { goto } = await import('$app/navigation');
		vi.mocked(goto).mockClear();

		render(Page, { data: makeData() });
		const input = page.getByRole('textbox', { name: SEARCH_LABEL });
		await input.fill('Brief');
		vi.advanceTimersByTime(500);

		expect(goto).toHaveBeenCalledWith(
			expect.any(String),
			expect.objectContaining({ keepFocus: true, noScroll: true })
		);
	});
});