/**
 * rSpace Unified Server
 *
 * Hono-based HTTP router + Bun WebSocket handler.
 * Mounts module routes under /:space/:moduleId.
 * Preserves backward-compatible subdomain routing and /api/communities/* API.
 */

import { resolve } from "node:path";
import { Hono } from "hono";
import { cors } from "hono/cors";
import type { ServerWebSocket } from "bun";
import {
	addShapes,
	clearShapes,
	communityExists,
	createCommunity,
	forgetShape,
	rememberShape,
	generateSyncMessageForPeer,
	getDocumentData,
	loadCommunity,
	receiveSyncMessage,
	removePeerSyncState,
	updateShape,
	updateShapeFields,
	cascadePermissions,
} from "./community-store";
import type { NestPermissions, SpaceRefFilter } from "./community-store";
import { ensureDemoCommunity } from "./seed-demo";
import { ensureCampaignDemo } from "./seed-campaign";
import type { SpaceVisibility } from "./community-store";
import {
	verifyEncryptIDToken,
	evaluateSpaceAccess,
	extractToken,
	authenticateWSUpgrade,
} from "@encryptid/sdk/server";
import type { EncryptIDClaims, SpaceAuthConfig } from "@encryptid/sdk/server";

// ── Module system ──
import { registerModule, getAllModules, getModuleInfoList } from "../shared/module";
import { canvasModule } from "../modules/canvas/mod";
import { booksModule } from "../modules/books/mod";
import { pubsModule } from "../modules/pubs/mod";
import { cartModule } from "../modules/cart/mod";
import { providersModule } from "../modules/providers/mod";
import { swagModule } from "../modules/swag/mod";
import { choicesModule } from "../modules/choices/mod";
import { fundsModule } from "../modules/funds/mod";
import { filesModule } from "../modules/files/mod";
import { forumModule } from "../modules/forum/mod";
import { walletModule } from "../modules/wallet/mod";
import { voteModule } from "../modules/vote/mod";
import { notesModule } from "../modules/notes/mod";
import { mapsModule } from "../modules/maps/mod";
import { workModule } from "../modules/work/mod";
import { tripsModule } from "../modules/trips/mod";
import { calModule } from "../modules/cal/mod";
import { networkModule } from "../modules/network/mod";
import { tubeModule } from "../modules/tube/mod";
import { inboxModule } from "../modules/inbox/mod";
import { dataModule } from "../modules/data/mod";
import { splatModule } from "../modules/splat/mod";
import { photosModule } from "../modules/photos/mod";
import { rsocialsModule } from "../modules/rsocials/mod";
import { spaces } from "./spaces";
import { renderShell, renderModuleLanding } from "./shell";
import { syncServer } from "./sync-instance";
import { loadAllDocs } from "./local-first/doc-persistence";

// Register modules
registerModule(canvasModule);
registerModule(booksModule);
registerModule(pubsModule);
registerModule(cartModule);
registerModule(providersModule);
registerModule(swagModule);
registerModule(choicesModule);
registerModule(fundsModule);
registerModule(filesModule);
registerModule(forumModule);
registerModule(walletModule);
registerModule(voteModule);
registerModule(notesModule);
registerModule(mapsModule);
registerModule(workModule);
registerModule(tripsModule);
registerModule(calModule);
registerModule(networkModule);
registerModule(tubeModule);
registerModule(inboxModule);
registerModule(dataModule);
registerModule(splatModule);
registerModule(photosModule);
registerModule(rsocialsModule);

// ── Config ──
const PORT = Number(process.env.PORT) || 3000;
const INTERNAL_API_KEY = process.env.INTERNAL_API_KEY || "";
const DIST_DIR = resolve(import.meta.dir, "../dist");

// ── Standalone landing page proxy cache ──
const landingCache = new Map<string, { html: string; at: number }>();
const LANDING_TTL = 5 * 60 * 1000; // 5 minutes

async function fetchStandaloneLanding(domain: string): Promise<string | null> {
	const cached = landingCache.get(domain);
	if (cached && Date.now() - cached.at < LANDING_TTL) return cached.html;

	try {
		const resp = await fetch(`https://${domain}/`, {
			headers: { "Accept": "text/html" },
			redirect: "follow",
		});
		if (!resp.ok) return null;
		let html = await resp.text();
		// Inject <base> so relative assets (CSS, JS, images) resolve to the standalone domain
		html = html.replace(/<head([^>]*)>/i, `<head$1>\n<base href="https://${domain}/">`);
		landingCache.set(domain, { html, at: Date.now() });
		return html;
	} catch {
		return null;
	}
}

// ── Hono app ──
const app = new Hono();

// CORS for API routes
app.use("/api/*", cors());

// ── .well-known/webauthn (WebAuthn Related Origins) ──
app.get("/.well-known/webauthn", (c) => {
	return c.json(
		{
			origins: [
				"https://rwallet.online",
				"https://rvote.online",
				"https://rmaps.online",
				"https://rfiles.online",
				"https://rnotes.online",
			],
		},
		200,
		{
			"Access-Control-Allow-Origin": "*",
			"Cache-Control": "public, max-age=3600",
		}
	);
});

// ── Space registry API ──
app.route("/api/spaces", spaces);

// ── mi — AI assistant endpoint ──
const MI_MODEL = process.env.MI_MODEL || "llama3.2";
const OLLAMA_URL = process.env.OLLAMA_URL || "http://localhost:11434";

app.post("/api/mi/ask", async (c) => {
	const { query, messages = [], space, module: currentModule } = await c.req.json();
	if (!query) return c.json({ error: "Query required" }, 400);

	// Build rApp context for the system prompt
	const moduleList = getModuleInfoList()
		.map((m) => `- **${m.name}** (${m.id}): ${m.icon} ${m.description}`)
		.join("\n");

	const systemPrompt = `You are mi, the intelligent assistant for rSpace — a self-hosted, community-run platform.
You help users navigate, understand, and get the most out of the platform's apps (rApps).

## Available rApps
${moduleList}

## Current Context
- Space: ${space || "none selected"}
- Active rApp: ${currentModule || "none"}

## Guidelines
- Be concise and helpful. Keep responses short (2-4 sentences) unless the user asks for detail.
- When suggesting actions, reference specific rApps by name and explain how they connect.
- You can suggest navigating to /:space/:moduleId paths.
- If you don't know something specific about the user's data, say so honestly.
- Use a warm, knowledgeable tone. You're a guide, not a search engine.`;

	// Build conversation for Ollama
	const ollamaMessages = [
		{ role: "system", content: systemPrompt },
		...messages.slice(-8).map((m: any) => ({ role: m.role, content: m.content })),
		{ role: "user", content: query },
	];

	try {
		const ollamaRes = await fetch(`${OLLAMA_URL}/api/chat`, {
			method: "POST",
			headers: { "Content-Type": "application/json" },
			body: JSON.stringify({ model: MI_MODEL, messages: ollamaMessages, stream: true }),
		});

		if (!ollamaRes.ok) {
			const errText = await ollamaRes.text().catch(() => "");
			console.error("mi: Ollama error:", ollamaRes.status, errText);
			return c.json({ error: "AI service unavailable" }, 502);
		}

		// Stream Ollama's NDJSON response directly to client
		return new Response(ollamaRes.body, {
			headers: {
				"Content-Type": "application/x-ndjson",
				"Cache-Control": "no-cache",
				"Transfer-Encoding": "chunked",
			},
		});
	} catch (e: any) {
		console.error("mi: Failed to reach Ollama:", e.message);
		// Fallback: return a static helpful response
		const fallback = generateFallbackResponse(query, currentModule, space, getModuleInfoList());
		return c.json({ response: fallback });
	}
});

function generateFallbackResponse(
	query: string,
	currentModule: string,
	space: string,
	modules: ReturnType<typeof getModuleInfoList>,
): string {
	const q = query.toLowerCase();

	// Simple keyword matching for common questions
	for (const m of modules) {
		if (q.includes(m.id) || q.includes(m.name.toLowerCase())) {
			return `**${m.name}** ${m.icon} — ${m.description}. You can access it at /${space || "personal"}/${m.id}.`;
		}
	}

	if (q.includes("help") || q.includes("what can")) {
		return `rSpace has ${modules.length} apps you can use. Some popular ones: **rSpace** (spatial canvas), **rNotes** (notes), **rChat** (messaging), **rFunds** (community funding), and **rVote** (governance). What would you like to explore?`;
	}

	if (q.includes("search") || q.includes("find")) {
		return `You can browse your content through the app switcher (top-left dropdown), or navigate directly to any rApp. Try **rNotes** for text content, **rFiles** for documents, or **rPhotos** for images.`;
	}

	return `I'm currently running in offline mode (AI service not connected). I can still help with basic navigation — ask me about any specific rApp or feature! There are ${modules.length} apps available in rSpace.`;
}

// ── Existing /api/communities/* routes (backward compatible) ──

/** Resolve a community slug to SpaceAuthConfig for the SDK guard */
async function getSpaceConfig(slug: string): Promise<SpaceAuthConfig | null> {
	let doc = getDocumentData(slug);
	if (!doc) {
		await loadCommunity(slug);
		doc = getDocumentData(slug);
	}
	if (!doc) return null;
	return {
		spaceSlug: slug,
		visibility: (doc.meta.visibility || "public_read") as SpaceVisibility,
		ownerDID: doc.meta.ownerDID || undefined,
		app: "rspace",
	};
}

// Demo reset rate limiter
let lastDemoReset = 0;
const DEMO_RESET_COOLDOWN = 5 * 60 * 1000;

// POST /api/communities — create community
app.post("/api/communities", async (c) => {
	const token = extractToken(c.req.raw.headers);
	if (!token) return c.json({ error: "Authentication required to create a community" }, 401);

	let claims: EncryptIDClaims;
	try {
		claims = await verifyEncryptIDToken(token);
	} catch {
		return c.json({ error: "Invalid or expired authentication token" }, 401);
	}

	const body = await c.req.json<{ name?: string; slug?: string; visibility?: SpaceVisibility }>();
	const { name, slug, visibility = "public_read" } = body;

	if (!name || !slug) return c.json({ error: "Name and slug are required" }, 400);
	if (!/^[a-z0-9-]+$/.test(slug)) return c.json({ error: "Slug must contain only lowercase letters, numbers, and hyphens" }, 400);

	const validVisibilities: SpaceVisibility[] = ["public", "public_read", "authenticated", "members_only"];
	if (!validVisibilities.includes(visibility)) return c.json({ error: `Invalid visibility` }, 400);
	if (await communityExists(slug)) return c.json({ error: "Community already exists" }, 409);

	await createCommunity(name, slug, claims.sub, visibility);

	// Notify modules
	for (const mod of getAllModules()) {
		if (mod.onSpaceCreate) {
			try { await mod.onSpaceCreate(slug); } catch (e) { console.error(`Module ${mod.id} onSpaceCreate:`, e); }
		}
	}

	return c.json({ url: `https://${slug}.rspace.online`, slug, name, visibility, ownerDID: claims.sub }, 201);
});

// POST /api/internal/provision — auth-free, called by rSpace Registry
app.post("/api/internal/provision", async (c) => {
	const body = await c.req.json<{ space?: string; description?: string; public?: boolean }>();
	const space = body.space?.trim();
	if (!space) return c.json({ error: "Missing space name" }, 400);

	if (await communityExists(space)) {
		return c.json({ status: "exists", slug: space });
	}

	const visibility: SpaceVisibility = body.public ? "public" : "public_read";
	await createCommunity(
		space.charAt(0).toUpperCase() + space.slice(1),
		space,
		`did:system:${space}`,
		visibility,
	);

	for (const mod of getAllModules()) {
		if (mod.onSpaceCreate) {
			try { await mod.onSpaceCreate(space); } catch (e) { console.error(`Module ${mod.id} onSpaceCreate:`, e); }
		}
	}

	return c.json({ status: "created", slug: space }, 201);
});

// POST /api/communities/demo/reset
app.post("/api/communities/demo/reset", async (c) => {
	const now = Date.now();
	if (now - lastDemoReset < DEMO_RESET_COOLDOWN) {
		const remaining = Math.ceil((DEMO_RESET_COOLDOWN - (now - lastDemoReset)) / 1000);
		return c.json({ error: `Demo reset on cooldown. Try again in ${remaining}s` }, 429);
	}
	lastDemoReset = now;
	await loadCommunity("demo");
	clearShapes("demo");
	await ensureDemoCommunity();
	broadcastAutomergeSync("demo");
	broadcastJsonSnapshot("demo");
	return c.json({ ok: true, message: "Demo community reset to seed data" });
});

// POST /api/communities/campaign-demo/reset
app.post("/api/communities/campaign-demo/reset", async (c) => {
	const now = Date.now();
	if (now - lastDemoReset < DEMO_RESET_COOLDOWN) {
		const remaining = Math.ceil((DEMO_RESET_COOLDOWN - (now - lastDemoReset)) / 1000);
		return c.json({ error: `Reset on cooldown. Try again in ${remaining}s` }, 429);
	}
	lastDemoReset = now;
	await loadCommunity("campaign-demo");
	clearShapes("campaign-demo");
	await ensureCampaignDemo();
	broadcastAutomergeSync("campaign-demo");
	broadcastJsonSnapshot("campaign-demo");
	return c.json({ ok: true, message: "Campaign demo reset to seed data" });
});

// GET /api/communities/:slug/shapes
app.get("/api/communities/:slug/shapes", async (c) => {
	const slug = c.req.param("slug");
	const token = extractToken(c.req.raw.headers);
	const access = await evaluateSpaceAccess(slug, token, "GET", { getSpaceConfig });

	if (!access.allowed) return c.json({ error: access.reason }, access.claims ? 403 : 401);

	await loadCommunity(slug);
	const data = getDocumentData(slug);
	if (!data) return c.json({ error: "Community not found" }, 404);

	return c.json({ shapes: data.shapes || {} });
});

// POST /api/communities/:slug/shapes
app.post("/api/communities/:slug/shapes", async (c) => {
	const slug = c.req.param("slug");
	const internalKey = c.req.header("X-Internal-Key");
	const isInternalCall = INTERNAL_API_KEY && internalKey === INTERNAL_API_KEY;

	if (!isInternalCall) {
		const token = extractToken(c.req.raw.headers);
		const access = await evaluateSpaceAccess(slug, token, "POST", { getSpaceConfig });
		if (!access.allowed) return c.json({ error: access.reason }, access.claims ? 403 : 401);
		if (access.readOnly) return c.json({ error: "Write access required to add shapes" }, 403);
	}

	await loadCommunity(slug);
	const data = getDocumentData(slug);
	if (!data) return c.json({ error: "Community not found" }, 404);

	const body = await c.req.json<{ shapes?: Record<string, unknown>[] }>();
	if (!body.shapes || !Array.isArray(body.shapes) || body.shapes.length === 0) {
		return c.json({ error: "shapes array is required and must not be empty" }, 400);
	}

	const ids = addShapes(slug, body.shapes);
	broadcastAutomergeSync(slug);
	broadcastJsonSnapshot(slug);

	return c.json({ ok: true, ids }, 201);
});

// PATCH /api/communities/:slug/shapes/:shapeId
app.patch("/api/communities/:slug/shapes/:shapeId", async (c) => {
	const slug = c.req.param("slug");
	const shapeId = c.req.param("shapeId");
	const internalKey = c.req.header("X-Internal-Key");
	const isInternalCall = INTERNAL_API_KEY && internalKey === INTERNAL_API_KEY;

	if (!isInternalCall) {
		const token = extractToken(c.req.raw.headers);
		const access = await evaluateSpaceAccess(slug, token, "PATCH", { getSpaceConfig });
		if (!access.allowed) return c.json({ error: access.reason }, access.claims ? 403 : 401);
	}

	await loadCommunity(slug);
	const body = await c.req.json<Record<string, unknown>>();
	const updated = updateShapeFields(slug, shapeId, body);
	if (!updated) return c.json({ error: "Shape not found" }, 404);

	broadcastAutomergeSync(slug);
	broadcastJsonSnapshot(slug);

	return c.json({ ok: true });
});

// GET /api/communities/:slug — community info
app.get("/api/communities/:slug", async (c) => {
	const slug = c.req.param("slug");
	const token = extractToken(c.req.raw.headers);
	const access = await evaluateSpaceAccess(slug, token, "GET", { getSpaceConfig });

	if (!access.allowed) return c.json({ error: access.reason }, access.claims ? 403 : 401);

	let data = getDocumentData(slug);
	if (!data) {
		await loadCommunity(slug);
		data = getDocumentData(slug);
	}
	if (!data) return c.json({ error: "Community not found" }, 404);

	return c.json({ meta: data.meta, readOnly: access.readOnly });
});

// ── Module info API (for app switcher) ──
app.get("/api/modules", (c) => {
	return c.json({ modules: getModuleInfoList() });
});

// ── Auto-provision personal space ──
app.post("/api/spaces/auto-provision", async (c) => {
	const token = extractToken(c.req.raw.headers);
	if (!token) return c.json({ error: "Authentication required" }, 401);

	let claims: EncryptIDClaims;
	try {
		claims = await verifyEncryptIDToken(token);
	} catch {
		return c.json({ error: "Invalid or expired token" }, 401);
	}

	const username = claims.username?.toLowerCase();
	if (!username || !/^[a-z0-9][a-z0-9-]*$/.test(username)) {
		return c.json({ error: "Username not suitable for space slug" }, 400);
	}

	if (await communityExists(username)) {
		return c.json({ status: "exists", slug: username });
	}

	await createCommunity(
		`${claims.username}'s Space`,
		username,
		claims.sub,
		"authenticated",
	);

	for (const mod of getAllModules()) {
		if (mod.onSpaceCreate) {
			try {
				await mod.onSpaceCreate(username);
			} catch (e) {
				console.error(`[AutoProvision] Module ${mod.id} onSpaceCreate:`, e);
			}
		}
	}

	console.log(`[AutoProvision] Created personal space: ${username}`);
	return c.json({ status: "created", slug: username }, 201);
});

// ── Mount module routes under /:space/:moduleId ──
for (const mod of getAllModules()) {
	app.route(`/:space/${mod.id}`, mod.routes);
}

// ── Page routes ──

// Landing page: rspace.online/ → serve marketing/info page
app.get("/", async (c) => {
	const file = Bun.file(resolve(DIST_DIR, "index.html"));
	if (await file.exists()) {
		return new Response(file, { headers: { "Content-Type": "text/html" } });
	}
	return c.text("rSpace", 200);
});

// About/info page (full landing content)
app.get("/about", async (c) => {
	const file = Bun.file(resolve(DIST_DIR, "index.html"));
	if (await file.exists()) {
		return new Response(file, { headers: { "Content-Type": "text/html" } });
	}
	return c.text("rSpace", 200);
});

// Create new space page
app.get("/create-space", async (c) => {
	const file = Bun.file(resolve(DIST_DIR, "create-space.html"));
	if (await file.exists()) {
		return new Response(file, { headers: { "Content-Type": "text/html" } });
	}
	return c.text("Create space", 200);
});

// Legacy redirect
app.get("/new", (c) => c.redirect("/create-space", 301));

// Admin dashboard
app.get("/admin", async (c) => {
	const file = Bun.file(resolve(DIST_DIR, "admin.html"));
	if (await file.exists()) {
		return new Response(file, { headers: { "Content-Type": "text/html" } });
	}
	return c.text("Admin", 200);
});

// Space root: /:space → redirect to /:space/rspace
app.get("/:space", (c) => {
	const space = c.req.param("space");
	// Don't redirect for static file paths
	if (space.includes(".")) return c.notFound();
	return c.redirect(`/${space}/rspace`);
});

// ── WebSocket types ──
interface WSData {
	communitySlug: string;
	peerId: string;
	claims: EncryptIDClaims | null;
	readOnly: boolean;
	mode: "automerge" | "json";
	// Nest context: set when a folk-canvas shape connects to a nested space
	nestFrom?: string;                  // slug of the parent space that contains the nest
	nestPermissions?: NestPermissions;  // effective permissions for this nested view
	nestFilter?: SpaceRefFilter;        // shape filter applied to this nested view
}

// Track connected clients per community
const communityClients = new Map<string, Map<string, ServerWebSocket<WSData>>>();

function generatePeerId(): string {
	return `peer-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
}

function getClient(slug: string, peerId: string): ServerWebSocket<WSData> | undefined {
	return communityClients.get(slug)?.get(peerId);
}

function broadcastJsonSnapshot(slug: string, excludePeerId?: string): void {
	const clients = communityClients.get(slug);
	if (!clients) return;
	const docData = getDocumentData(slug);
	if (!docData) return;
	const allShapes = docData.shapes || {};

	// Pre-build the unfiltered message (most clients use this)
	let unfilteredMsg: string | null = null;

	for (const [clientPeerId, client] of clients) {
		if (client.data.mode === "json" && clientPeerId !== excludePeerId && client.readyState === WebSocket.OPEN) {
			// Apply nest filter for nested connections
			if (client.data.nestFilter) {
				const filtered: typeof allShapes = {};
				for (const [id, shape] of Object.entries(allShapes)) {
					if (client.data.nestFilter.shapeTypes && !client.data.nestFilter.shapeTypes.includes(shape.type)) continue;
					if (client.data.nestFilter.shapeIds && !client.data.nestFilter.shapeIds.includes(id)) continue;
					filtered[id] = shape;
				}
				client.send(JSON.stringify({ type: "snapshot", shapes: filtered }));
			} else {
				if (!unfilteredMsg) unfilteredMsg = JSON.stringify({ type: "snapshot", shapes: allShapes });
				client.send(unfilteredMsg);
			}
		}
	}
}

function broadcastAutomergeSync(slug: string, excludePeerId?: string): void {
	const clients = communityClients.get(slug);
	if (!clients) return;
	for (const [clientPeerId, client] of clients) {
		if (client.data.mode === "automerge" && clientPeerId !== excludePeerId && client.readyState === WebSocket.OPEN) {
			const syncMsg = generateSyncMessageForPeer(slug, clientPeerId);
			if (syncMsg) {
				client.send(JSON.stringify({ type: "sync", data: Array.from(syncMsg) }));
			}
		}
	}
}

// ── Subdomain parsing (backward compat) ──
const RESERVED_SUBDOMAINS = ["www", "rspace", "create", "new", "start", "auth"];

function getSubdomain(host: string | null): string | null {
	if (!host) return null;
	if (host.includes("localhost") || host.includes("127.0.0.1")) return null;
	const parts = host.split(".");
	if (parts.length >= 3 && parts.slice(-2).join(".") === "rspace.online") {
		const sub = parts[0];
		if (!RESERVED_SUBDOMAINS.includes(sub)) return sub;
	}
	return null;
}

// ── Static file serving ──
function getContentType(path: string): string {
	if (path.endsWith(".html")) return "text/html";
	if (path.endsWith(".js")) return "application/javascript";
	if (path.endsWith(".css")) return "text/css";
	if (path.endsWith(".json")) return "application/json";
	if (path.endsWith(".svg")) return "image/svg+xml";
	if (path.endsWith(".wasm")) return "application/wasm";
	if (path.endsWith(".png")) return "image/png";
	if (path.endsWith(".jpg") || path.endsWith(".jpeg")) return "image/jpeg";
	if (path.endsWith(".gif")) return "image/gif";
	if (path.endsWith(".ico")) return "image/x-icon";
	return "application/octet-stream";
}

async function serveStatic(path: string): Promise<Response | null> {
	const filePath = resolve(DIST_DIR, path);
	const file = Bun.file(filePath);
	if (await file.exists()) {
		return new Response(file, { headers: { "Content-Type": getContentType(path) } });
	}
	return null;
}

// ── Standalone domain → module lookup ──
const domainToModule = new Map<string, string>();
for (const mod of getAllModules()) {
	if (mod.standaloneDomain) {
		domainToModule.set(mod.standaloneDomain, mod.id);
	}
}

// ── Bun.serve: WebSocket + fetch delegation ──
const server = Bun.serve<WSData>({
	port: PORT,

	async fetch(req, server) {
		const url = new URL(req.url);
		const host = req.headers.get("host");
		const hostClean = host?.split(":")[0] || "";
		const subdomain = getSubdomain(host);

		// ── Standalone domain → internal rewrite to module routes ──
		const standaloneModuleId = domainToModule.get(hostClean);
		if (standaloneModuleId) {
			// Static assets pass through
			if (url.pathname !== "/" && !url.pathname.startsWith("/api/") && !url.pathname.startsWith("/ws/")) {
				const assetPath = url.pathname.slice(1);
				if (assetPath.includes(".")) {
					const staticResponse = await serveStatic(assetPath);
					if (staticResponse) return staticResponse;
				}
			}

			// Rewrite path internally: / → /demo/{moduleId}
			const pathParts = url.pathname.split("/").filter(Boolean);
			let space = "demo";
			let suffix = "";

			if (
				pathParts.length > 0 &&
				!pathParts[0].includes(".") &&
				pathParts[0] !== "api" &&
				pathParts[0] !== "ws"
			) {
				space = pathParts[0];
				suffix = pathParts.length > 1 ? "/" + pathParts.slice(1).join("/") : "";
			} else if (url.pathname !== "/") {
				suffix = url.pathname;
			}

			const rewrittenPath = `/${space}/${standaloneModuleId}${suffix}`;
			const rewrittenUrl = new URL(rewrittenPath + url.search, `http://localhost:${PORT}`);
			const rewrittenReq = new Request(rewrittenUrl, req);
			return app.fetch(rewrittenReq);
		}

		// ── WebSocket upgrade ──
		if (url.pathname.startsWith("/ws/")) {
			const communitySlug = url.pathname.split("/")[2];
			if (communitySlug) {
				const spaceConfig = await getSpaceConfig(communitySlug);
				const claims = await authenticateWSUpgrade(req);
				let readOnly = false;

				if (spaceConfig) {
					const vis = spaceConfig.visibility;
					if (vis === "authenticated" || vis === "members_only") {
						if (!claims) return new Response("Authentication required", { status: 401 });
					} else if (vis === "public_read") {
						readOnly = !claims;
					}
				}

				const peerId = generatePeerId();
				const mode = url.searchParams.get("mode") === "json" ? "json" : "automerge";

				// Nest context: if connecting from a parent space via folk-canvas
				const nestFrom = url.searchParams.get("nest-from") || undefined;
				let nestPermissions: NestPermissions | undefined;
				let nestFilter: SpaceRefFilter | undefined;

				if (nestFrom) {
					await loadCommunity(nestFrom);
					const parentData = getDocumentData(nestFrom);
					if (parentData?.nestedSpaces) {
						// Find the SpaceRef in the parent that points to this space
						const matchingRef = Object.values(parentData.nestedSpaces)
							.find(ref => ref.sourceSlug === communitySlug);
						if (matchingRef) {
							nestPermissions = matchingRef.permissions;
							nestFilter = matchingRef.filter;
							// If nest doesn't allow writes, force readOnly
							if (!matchingRef.permissions.write) {
								readOnly = true;
							}
						}
					}
				}

				const upgraded = server.upgrade(req, {
					data: { communitySlug, peerId, claims, readOnly, mode, nestFrom, nestPermissions, nestFilter } as WSData,
				});
				if (upgraded) return undefined;
			}
			return new Response("WebSocket upgrade failed", { status: 400 });
		}

		// ── Explicit page routes (before Hono, to avoid /:space catch-all) ──
		if (url.pathname === "/admin") {
			const adminHtml = await serveStatic("admin.html");
			if (adminHtml) return adminHtml;
		}

		// ── Static assets (before Hono routing) ──
		if (url.pathname !== "/" && !url.pathname.startsWith("/api/") && !url.pathname.startsWith("/ws/")) {
			const assetPath = url.pathname.slice(1);
			// Serve files with extensions directly
			if (assetPath.includes(".")) {
				const staticResponse = await serveStatic(assetPath);
				if (staticResponse) return staticResponse;
			}
		}

		// ── Subdomain routing: {space}.rspace.online/{moduleId}/... ──
		if (subdomain) {
			const pathSegments = url.pathname.split("/").filter(Boolean);

			// Root: redirect to default module (rspace)
			if (pathSegments.length === 0) {
				return Response.redirect(`${url.protocol}//${host}/rspace`, 302);
			}

			// Global routes pass through without subdomain prefix
			if (
				url.pathname.startsWith("/api/") ||
				url.pathname.startsWith("/.well-known/") ||
				url.pathname === "/about" ||
				url.pathname === "/admin" ||
				url.pathname === "/create-space" ||
				url.pathname === "/new"
			) {
				return app.fetch(req);
			}

			// Static assets (paths with file extensions) pass through
			if (pathSegments[0].includes(".")) {
				return app.fetch(req);
			}

			// Rewrite: /{moduleId}/... → /{space}/{moduleId}/...
			// e.g. demo.rspace.online/vote/api/polls → /demo/vote/api/polls
			const rewrittenPath = `/${subdomain}${url.pathname}`;
			const rewrittenUrl = new URL(rewrittenPath + url.search, `http://localhost:${PORT}`);
			const rewrittenReq = new Request(rewrittenUrl, req);
			return app.fetch(rewrittenReq);
		}

		// ── Bare-domain module routes: rspace.online/{moduleId} ──
		// Exact module path → proxy the standalone domain's landing page.
		// Sub-paths (API, assets) → rewrite to /demo/{moduleId}/... for backward compat.
		if (!subdomain && hostClean.includes("rspace.online")) {
			const pathSegments = url.pathname.split("/").filter(Boolean);
			if (pathSegments.length >= 1) {
				const firstSegment = pathSegments[0];
				const knownModuleIds = new Set(getAllModules().map((m) => m.id));
				if (knownModuleIds.has(firstSegment)) {
					// Exact module path → proxy from standalone domain
					if (pathSegments.length === 1) {
						const mod = getAllModules().find((m) => m.id === firstSegment);
						if (mod?.standaloneDomain) {
							const html = await fetchStandaloneLanding(mod.standaloneDomain);
							if (html) {
								return new Response(html, {
									headers: { "Content-Type": "text/html; charset=utf-8" },
								});
							}
						}
						// Fallback: generated landing page (no standalone domain or fetch failed)
						const modInfo = getModuleInfoList().find((m) => m.id === firstSegment);
						if (modInfo) {
							return new Response(
								renderModuleLanding({
									module: modInfo,
									modules: getModuleInfoList(),
								}),
								{ headers: { "Content-Type": "text/html; charset=utf-8" } },
							);
						}
					}
					// Sub-paths → rewrite to demo space
					const rewrittenPath = `/demo${url.pathname}`;
					const rewrittenUrl = new URL(rewrittenPath + url.search, `http://localhost:${PORT}`);
					const rewrittenReq = new Request(rewrittenUrl, req);
					return app.fetch(rewrittenReq);
				}
			}
		}

		// ── Hono handles everything else ──
		const response = await app.fetch(req);

		// If Hono returns 404, try serving canvas.html as SPA fallback
		// But only for paths that don't match a known module route
		if (response.status === 404 && !url.pathname.startsWith("/api/")) {
			const parts = url.pathname.split("/").filter(Boolean);
			// Check if this is under a known module — if so, the module's 404 is authoritative
			const knownModuleIds = getAllModules().map((m) => m.id);
			const isModulePath = parts.length >= 2 && knownModuleIds.includes(parts[1]);

			if (!isModulePath && parts.length >= 1 && !parts[0].includes(".")) {
				// Not a module path — could be a canvas SPA route, try fallback
				const canvasHtml = await serveStatic("canvas.html");
				if (canvasHtml) return canvasHtml;

				const indexHtml = await serveStatic("index.html");
				if (indexHtml) return indexHtml;
			}
		}

		return response;
	},

	// ── WebSocket handlers (unchanged) ──
	websocket: {
		open(ws: ServerWebSocket<WSData>) {
			const { communitySlug, peerId, mode, nestFrom, nestFilter, claims } = ws.data;

			if (!communityClients.has(communitySlug)) {
				communityClients.set(communitySlug, new Map());
			}
			communityClients.get(communitySlug)!.set(peerId, ws);

			// Register with DocSyncManager for multi-doc sync
			syncServer.addPeer(peerId, ws, claims ? { sub: claims.sub, username: claims.username } : undefined);

			const nestLabel = nestFrom ? ` (nested from ${nestFrom})` : "";
			console.log(`[WS] Client ${peerId} connected to ${communitySlug} (mode: ${mode})${nestLabel}`);

			loadCommunity(communitySlug).then((doc) => {
				if (!doc) return;

				if (mode === "json") {
					const docData = getDocumentData(communitySlug);
					if (docData) {
						let shapes = docData.shapes || {};

						// Apply nest filter if this is a nested connection
						if (nestFilter) {
							const filtered: typeof shapes = {};
							for (const [id, shape] of Object.entries(shapes)) {
								if (nestFilter.shapeTypes && !nestFilter.shapeTypes.includes(shape.type)) continue;
								if (nestFilter.shapeIds && !nestFilter.shapeIds.includes(id)) continue;
								filtered[id] = shape;
							}
							shapes = filtered;
						}

						ws.send(JSON.stringify({ type: "snapshot", shapes }));
					}
				} else {
					const syncMessage = generateSyncMessageForPeer(communitySlug, peerId);
					if (syncMessage) {
						ws.send(JSON.stringify({ type: "sync", data: Array.from(syncMessage) }));
					}
				}
			});
		},

		message(ws: ServerWebSocket<WSData>, message: string | Buffer) {
			const { communitySlug, peerId } = ws.data;

			try {
				const msg = JSON.parse(message.toString());

				// ── DocSyncManager protocol (messages with docId) ──
				if (msg.type === "subscribe" || msg.type === "unsubscribe" || msg.type === "awareness") {
					if (msg.docIds || msg.docId) {
						syncServer.handleMessage(peerId, message.toString());
						return;
					}
				}
				if (msg.type === "sync" && msg.docId) {
					// New protocol: sync with docId → route to SyncServer
					syncServer.handleMessage(peerId, message.toString());
					return;
				}

				// ── Legacy canvas protocol (no docId) ──
				if (msg.type === "sync" && Array.isArray(msg.data)) {
					if (ws.data.readOnly) {
						ws.send(JSON.stringify({ type: "error", message: "Authentication required to edit this space" }));
						return;
					}
					const syncMessage = new Uint8Array(msg.data);
					const result = receiveSyncMessage(communitySlug, peerId, syncMessage);

					if (result.response) {
						ws.send(JSON.stringify({ type: "sync", data: Array.from(result.response) }));
					}

					for (const [targetPeerId, targetMessage] of result.broadcastToPeers) {
						const targetClient = getClient(communitySlug, targetPeerId);
						if (targetClient && targetClient.data.mode === "automerge" && targetClient.readyState === WebSocket.OPEN) {
							targetClient.send(JSON.stringify({ type: "sync", data: Array.from(targetMessage) }));
						}
					}

					if (result.broadcastToPeers.size > 0) {
						broadcastJsonSnapshot(communitySlug, peerId);
					}
				} else if (msg.type === "ping") {
					ws.send(JSON.stringify({ type: "pong", timestamp: msg.timestamp }));
				} else if (msg.type === "presence") {
					const clients = communityClients.get(communitySlug);
					if (clients) {
						const presenceMsg = JSON.stringify({ type: "presence", peerId, ...msg });
						for (const [clientPeerId, client] of clients) {
							if (clientPeerId !== peerId && client.readyState === WebSocket.OPEN) {
								client.send(presenceMsg);
							}
						}
					}
				} else if (msg.type === "update" && msg.id && msg.data) {
					if (ws.data.readOnly) {
						ws.send(JSON.stringify({ type: "error", message: "Authentication required to edit" }));
						return;
					}
					// Nest-level: check addShapes for new shapes
					if (ws.data.nestPermissions) {
						const existingDoc = getDocumentData(communitySlug);
						const isNewShape = existingDoc && !existingDoc.shapes?.[msg.id];
						if (isNewShape && !ws.data.nestPermissions.addShapes) {
							ws.send(JSON.stringify({ type: "error", message: "Nest permissions do not allow adding shapes" }));
							return;
						}
					}
					updateShape(communitySlug, msg.id, msg.data);
					broadcastJsonSnapshot(communitySlug, peerId);
					broadcastAutomergeSync(communitySlug, peerId);
				} else if (msg.type === "delete" && msg.id) {
					if (ws.data.readOnly) {
						ws.send(JSON.stringify({ type: "error", message: "Authentication required to delete" }));
						return;
					}
					if (ws.data.nestPermissions && !ws.data.nestPermissions.deleteShapes) {
						ws.send(JSON.stringify({ type: "error", message: "Nest permissions do not allow deleting shapes" }));
						return;
					}
					forgetShape(communitySlug, msg.id, ws.data.claims?.sub);
					broadcastJsonSnapshot(communitySlug, peerId);
					broadcastAutomergeSync(communitySlug, peerId);
				} else if (msg.type === "forget" && msg.id) {
					if (ws.data.readOnly) {
						ws.send(JSON.stringify({ type: "error", message: "Authentication required to forget" }));
						return;
					}
					if (ws.data.nestPermissions && !ws.data.nestPermissions.deleteShapes) {
						ws.send(JSON.stringify({ type: "error", message: "Nest permissions do not allow forgetting shapes" }));
						return;
					}
					forgetShape(communitySlug, msg.id, ws.data.claims?.sub);
					broadcastJsonSnapshot(communitySlug, peerId);
					broadcastAutomergeSync(communitySlug, peerId);
				} else if (msg.type === "remember" && msg.id) {
					if (ws.data.readOnly) {
						ws.send(JSON.stringify({ type: "error", message: "Authentication required to remember" }));
						return;
					}
					rememberShape(communitySlug, msg.id);
					broadcastJsonSnapshot(communitySlug, peerId);
					broadcastAutomergeSync(communitySlug, peerId);
				}
			} catch (e) {
				console.error("[WS] Failed to parse message:", e);
			}
		},

		close(ws: ServerWebSocket<WSData>) {
			const { communitySlug, peerId } = ws.data;
			const clients = communityClients.get(communitySlug);
			if (clients) {
				clients.delete(peerId);
				if (clients.size === 0) communityClients.delete(communitySlug);
			}
			removePeerSyncState(communitySlug, peerId);
			syncServer.removePeer(peerId);
			console.log(`[WS] Client ${peerId} disconnected from ${communitySlug}`);
		},
	},
});

// ── Startup ──
ensureDemoCommunity().then(() => console.log("[Demo] Demo community ready")).catch((e) => console.error("[Demo] Failed:", e));
ensureCampaignDemo().then(() => console.log("[Campaign] Campaign demo ready")).catch((e) => console.error("[Campaign] Failed:", e));
loadAllDocs(syncServer).catch((e) => console.error("[DocStore] Startup load failed:", e));

console.log(`rSpace unified server running on http://localhost:${PORT}`);
console.log(`Modules: ${getAllModules().map((m) => `${m.icon} ${m.name}`).join(", ")}`);