/**
 * SP-series — Fase 16 (loading spinner visual feedback).
 *
 * The Spinner component itself is unit-tested in
 * `src/lib/components/Spinner.test.ts` (SP-U-01..05). These E2E specs assert
 * that the spinner actually shows up at the five integration sites listed in
 * `plan/fase-16-spinner.md` when the backing async operation is in flight.
 *
 * Strategy: every spec uses `page.route(...)` to add ~500ms of artificial
 * latency to the request that drives the spinner so the assertion window is
 * deterministic — without the throttle the loopback round-trip resolves in
 * <30ms and the spinner can flicker past Playwright's auto-wait cadence.
 */
import { test, expect } from '@playwright/test';
import { USERS } from '../fixtures/users.js';
import { loginAs } from '../fixtures/login.js';

const THROTTLE_MS = 500;

test.describe('Loading spinner', () => {
	test('SP-E-01: /search shows the spinner while the search RPC is in flight', async ({
		page
	}) => {
		await loginAs(page, USERS.borja);

		// Throttle the search RPC so the loading window stays open long enough
		// for the spinner assertion below.
		await page.route('**/rest/v1/rpc/search_in_collective**', async (route) => {
			await new Promise((r) => setTimeout(r, THROTTLE_MS));
			await route.continue();
		});

		await page.goto('/search');
		const input = page.getByPlaceholder(/search|buscar/i);
		await expect(input).toBeVisible({ timeout: 15_000 });
		await input.fill('Milk');

		// Debounce is 300ms + 500ms throttle ≈ ~800ms window where the
		// spinner is mounted in the `{#if loading}` branch of /search.
		const spinner = page.getByTestId('spinner').first();
		await expect(spinner).toBeVisible({ timeout: 5_000 });

		// And it disappears once the RPC resolves.
		await expect(spinner).toHaveCount(0, { timeout: 10_000 });
	});

	test('SP-E-02: Save button in "Add common item" modal shows the spinner while saving', async ({
		page
	}) => {
		await loginAs(page, USERS.ana);

		// Throttle the set_item_frequency_weight RPC so addSaving stays true
		// long enough for the spinner to be visible.
		await page.route(
			'**/rest/v1/rpc/set_item_frequency_weight**',
			async (route) => {
				await new Promise((r) => setTimeout(r, THROTTLE_MS));
				await route.continue();
			}
		);

		await page.goto('/collective/manage');
		await page.waitForLoadState('networkidle');

		await page.getByTestId('common-item-add-button').click();
		const nameInput = page.getByTestId('common-item-add-name');
		await expect(nameInput).toBeVisible({ timeout: 5_000 });
		await nameInput.fill(`sp-e-02-${Date.now()}`);

		const saveButton = page.getByTestId('common-item-add-save');
		await saveButton.click();

		// Spinner is scoped inside the Save button so we look for any spinner
		// that's also a descendant of the button — this avoids matching some
		// unrelated spinner elsewhere on the page.
		await expect(saveButton.getByTestId('spinner')).toBeVisible({ timeout: 5_000 });
	});

	test('SP-E-03: auth splash shows the spinner while Supabase resolves the session', async ({
		browser
	}) => {
		// The splash in `(app)/+layout.svelte` is gated on `$authLoading`,
		// which only flips false once Supabase's `onAuthStateChange` fires
		// `INITIAL_SESSION`. With no stored session the emit is synchronous
		// and the splash flashes past Playwright's auto-wait.
		//
		// Trick: seed localStorage with an *expired* sb-* auth token so
		// GoTrue's `_recoverAndRefresh` is forced to hit
		// `/auth/v1/token?grant_type=refresh_token`. Throttle that endpoint
		// by 500ms and the splash stays mounted for the assertion window.
		const context = await browser.newContext();
		const page = await context.newPage();

		await context.addInitScript(() => {
			// Synthetic expired Supabase session. We can't sign it correctly,
			// but GoTrue trusts the stored payload and skips straight to
			// refresh as soon as it sees expires_at in the past.
			const payload = {
				access_token: 'sp-e-03-fake-access',
				token_type: 'bearer',
				expires_in: 3600,
				expires_at: Math.floor(Date.now() / 1000) - 60,
				refresh_token: 'sp-e-03-fake-refresh',
				user: {
					id: '00000000-0000-0000-0000-000000000000',
					aud: 'authenticated',
					role: 'authenticated',
					email: 'spinner-splash@dev.local',
					app_metadata: { provider: 'keycloak' },
					user_metadata: {},
					created_at: new Date().toISOString()
				}
			};
			// Supabase derives the storage key from the URL hostname (first
			// label only): `sb-${hostname.split('.')[0]}-auth-token`. Our dev
			// PUBLIC_SUPABASE_URL is http://192.168.1.167:8001 → key
			// `sb-192-auth-token`. We populate every plausible key so the
			// test is resilient to a localhost override.
			const KEYS = ['sb-192-auth-token', 'sb-localhost-auth-token'];
			for (const k of KEYS) localStorage.setItem(k, JSON.stringify(payload));
		});

		// Stall the GoTrue token-refresh endpoint indefinitely. With the
		// seeded expired session above, `_recoverAndRefresh` is forced to
		// call POST /auth/v1/token?grant_type=refresh_token before emitting
		// INITIAL_SESSION. While the call is in flight `authLoading` stays
		// true and the splash is mounted, which is exactly the window the
		// assertion needs. We never `route.continue()` — the test asserts
		// the spinner is visible and then tears the context down.
		let releaseToken: (() => void) | null = null;
		const tokenStall = new Promise<void>((resolve) => {
			releaseToken = resolve;
		});
		await page.route('**/auth/v1/token**', async (route) => {
			await tokenStall;
			await route.fulfill({ status: 503, body: '{}' });
		});

		try {
			await page.goto('/lists', { waitUntil: 'commit' });
			const spinner = page.getByTestId('spinner').first();
			await expect(spinner).toBeVisible({ timeout: 10_000 });
		} finally {
			// Release the stalled refresh so the context can shut down cleanly.
			if (releaseToken) releaseToken();
			await context.close();
		}
	});
});