/**
 * Playwright smoke check for the SvelteKit demo/docs pages under web/routes.
 *
 * What it verifies per route (beyond HTTP 200):
 *   - No uncaught `pageerror` (thrown during component init / hydration).
 *   - No `console.error` (runtime exceptions that didn't throw synchronously).
 *   - No translation key missing warnings (`Translation key not found`).
 *   - No soma context-not-found warnings (`Context "X" not found`).
 *   - No rendered `__uix_lang_missing__` fallback marker.
 *
 * Usage:
 *   node scripts/smoke-check.mjs [base-url]
 *   SMOKE_SCOPE=/uix node scripts/smoke-check.mjs [base-url]
 *   npm run smoke
 *
 * Requires `npm run dev` running in another terminal (or passes an explicit
 * base URL). The script tries 5173-5180 if no URL is given.
 */

import { chromium } from 'playwright';
import { existsSync, readdirSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROUTES_DIR = join(__dirname, '..', 'web', 'routes');
const scope = normaliseScope(process.env.SMOKE_SCOPE);

function normaliseScope(value) {
	if (!value) return null;
	const trimmed = value.trim();
	if (!trimmed || trimmed === '/') return null;
	return trimmed.startsWith('/') ? trimmed : `/${trimmed}`;
}

function routeFromSegments(segments) {
	const routeSegments = [];
	for (const segment of segments) {
		if (segment.startsWith('(') && segment.endsWith(')')) continue;
		if (segment.startsWith('@')) continue;
		if (segment.includes('[')) return null;
		routeSegments.push(segment);
	}
	return `/${routeSegments.join('/')}`.replace(/\/$/, '') || '/';
}

/** Find every concrete `{route}/+page.svelte` under web/routes recursively. */
function discoverRoutes(dir, segments = []) {
	const routes = [];
	const entries = readdirSync(dir, { withFileTypes: true });
	for (const entry of entries) {
		const name = entry.name;
		const full = join(dir, name);
		if (entry.isDirectory()) {
			routes.push(...discoverRoutes(full, [...segments, name]));
		} else if (name === '+page.svelte') {
			const route = routeFromSegments(segments);
			if (route && (!scope || route === scope || route.startsWith(`${scope}/`))) {
				routes.push(route);
			}
		}
	}
	return routes;
}

async function probePort(startPort, endPort) {
	for (let port = startPort; port <= endPort; port++) {
		try {
			const res = await fetch(`http://localhost:${port}/`, {
				signal: AbortSignal.timeout(500)
			});
			if (res.ok || res.status === 404 || res.status === 500) {
				return `http://localhost:${port}`;
			}
		} catch {
			// connection refused — try next
		}
	}
	return null;
}

const BASE = process.argv[2] ?? (await probePort(5173, 5180));
if (!BASE) {
	console.error('Could not find a running dev server on 5173-5180.');
	console.error('Start it with `npm run dev` in another terminal.');
	process.exit(2);
}
console.error(`Using dev server at ${BASE}`);
const baseOrigin = new URL(BASE).origin;

if (!existsSync(ROUTES_DIR)) {
	console.error(`Routes directory not found: ${ROUTES_DIR}`);
	process.exit(2);
}

const routes = discoverRoutes(ROUTES_DIR).sort();
if (routes.length === 0) {
	console.error(
		scope
			? `No concrete +page.svelte files found under web/routes for scope ${scope}.`
			: 'No concrete +page.svelte files found under web/routes.'
	);
	process.exit(2);
}
console.error(`Checking ${routes.length} routes${scope ? ` under ${scope}` : ''}...`);

const browser = await chromium.launch();
const ctx = await browser.newContext();
const failures = [];
const MAX_PARALLEL = 4;

async function checkRoute(route) {
	const page = await ctx.newPage();
	const errors = [];
	const warnings = [];
	page.on('pageerror', (e) => errors.push(`  pageerror: ${e.message}`));
	page.on('requestfailed', (request) => {
		const url = request.url();
		if (url.startsWith('data:') || url.startsWith('blob:') || url.includes('/@vite/')) return;
		const origin = new URL(url).origin;
		if (origin !== baseOrigin) return;
		errors.push(`  requestfailed: ${url} (${request.failure()?.errorText ?? 'unknown error'})`);
	});
	page.on('console', (m) => {
		const t = m.text();
		if (m.type() === 'error') {
			// Filter out some noisy devtools messages unrelated to correctness.
			if (t.includes('Download the React DevTools')) return;
			// Resource request failures are handled by the `requestfailed` hook above,
			// where we can distinguish local app regressions from optional external assets.
			if (t.startsWith('Failed to load resource:')) return;
			errors.push(`  console.error: ${t}`);
		}
		if (m.type() === 'warning' || m.type() === 'warn') {
			if (
				t.includes('Translation key not found') ||
				t.includes('__uix_lang_missing__') ||
				t.includes('Context') ||
				t.includes('[soma]') ||
				t.includes('soma context')
			) {
				warnings.push(`  console.warning: ${t}`);
			}
		}
	});
	try {
		const res = await page.goto(BASE + route, {
			waitUntil: 'domcontentloaded',
			timeout: 20000
		});
		const status = res?.status() ?? 0;
		// Give reactive effects + lazy demos a moment to settle.
		await page.waitForTimeout(500);
		const bodyText = await page.locator('body').innerText({ timeout: 2000 }).catch(() => '');
		if (bodyText.includes('__uix_lang_missing__')) {
			errors.push('  body: rendered __uix_lang_missing__ fallback marker');
		}
		if (
			bodyText.includes('Internal Error') ||
			bodyText.includes('undefined is not a function') ||
			bodyText.includes('Cannot read properties')
		) {
			errors.push('  body: rendered runtime error text');
		}
		if (status !== 200 || errors.length > 0 || warnings.length > 0) {
			const lines = [`FAIL ${route}  (HTTP ${status})`];
			errors.forEach((e) => lines.push(e));
			warnings.forEach((w) => lines.push(w));
			return { ok: false, lines };
		}
		return { ok: true, lines: [`PASS ${route}`] };
	} catch (e) {
		return {
			ok: false,
			lines: [`FAIL ${route}  (navigation error: ${e.message})`]
		};
	} finally {
		await page.close();
	}
}

// Run checks with bounded concurrency so the dev server doesn't get hammered.
let cursor = 0;
async function worker() {
	while (cursor < routes.length) {
		const idx = cursor++;
		const route = routes[idx];
		const result = await checkRoute(route);
		result.lines.forEach((l) => console.log(l));
		if (!result.ok) failures.push(route);
	}
}
await Promise.all(Array.from({ length: MAX_PARALLEL }, () => worker()));

await browser.close();
console.log('');
console.log(
	failures.length === 0
		? `All ${routes.length} routes passed.`
		: `${failures.length}/${routes.length} routes failed: ${failures.join(', ')}`
);
process.exit(failures.length === 0 ? 0 : 1);