/**
 * Docs module — collaborative documentation via Docmost.
 *
 * Wraps the Docmost instance as an external app embedded in the rSpace shell.
 */

import { Hono } from "hono";
import * as Automerge from "@automerge/automerge";
import { renderShell, renderExternalAppShell } from "../../server/shell";
import { getModuleInfoList } from "../../shared/module";
import type { RSpaceModule } from "../../shared/module";
import { verifyToken, extractToken } from "../../server/auth";
import type { SyncServer } from '../../server/local-first/sync-server';
import { docsSchema, docsDocId } from './schemas';
import type { DocsDoc, LinkedDocument } from './schemas';

let _syncServer: SyncServer | null = null;

const routes = new Hono();

const DOCMOST_URL = "https://docs.cosmolocal.world";

// ── Local-first helpers ──

function ensureDocsDoc(space: string): DocsDoc {
	const docId = docsDocId(space);
	let doc = _syncServer!.getDoc<DocsDoc>(docId);
	if (!doc) {
		doc = Automerge.change(Automerge.init<DocsDoc>(), 'init docs registry', (d) => {
			const init = docsSchema.init();
			Object.assign(d, init);
			d.meta.spaceSlug = space;
		});
		_syncServer!.setDoc(docId, doc);
	}
	return doc;
}

// ── CRUD: Document Registry ──

routes.get("/api/registry", (c) => {
	if (!_syncServer) return c.json({ documents: [] });
	const space = c.req.param("space") || "demo";
	const doc = ensureDocsDoc(space);
	return c.json({ documents: Object.values(doc.linkedDocuments || {}) });
});

routes.post("/api/registry", async (c) => {
	const token = extractToken(c.req.raw.headers);
	if (!token) return c.json({ error: "Authentication required" }, 401);
	let claims;
	try { claims = await verifyToken(token); } catch { return c.json({ error: "Invalid token" }, 401); }
	if (!_syncServer) return c.json({ error: "Not initialized" }, 503);
	const space = c.req.param("space") || "demo";
	const { url, title } = await c.req.json();
	if (!url || !title) return c.json({ error: "url and title required" }, 400);
	const id = crypto.randomUUID();
	const docId = docsDocId(space);
	ensureDocsDoc(space);
	_syncServer.changeDoc<DocsDoc>(docId, `register document ${id}`, (d) => {
		d.linkedDocuments[id] = { id, url, title, addedBy: claims.sub || null, addedAt: Date.now() };
	});
	const updated = _syncServer.getDoc<DocsDoc>(docId)!;
	return c.json(updated.linkedDocuments[id], 201);
});

routes.delete("/api/registry/:docRefId", async (c) => {
	const token = extractToken(c.req.raw.headers);
	if (!token) return c.json({ error: "Authentication required" }, 401);
	try { await verifyToken(token); } catch { return c.json({ error: "Invalid token" }, 401); }
	if (!_syncServer) return c.json({ error: "Not initialized" }, 503);
	const space = c.req.param("space") || "demo";
	const docRefId = c.req.param("docRefId");
	const docId = docsDocId(space);
	const doc = ensureDocsDoc(space);
	if (!doc.linkedDocuments[docRefId]) return c.json({ error: "Not found" }, 404);
	_syncServer.changeDoc<DocsDoc>(docId, `unregister document ${docRefId}`, (d) => { delete d.linkedDocuments[docRefId]; });
	return c.json({ ok: true });
});

routes.get("/api/health", (c) => {
	return c.json({ ok: true, module: "rdocs" });
});

routes.get("/", (c) => {
	const space = c.req.param("space") || "demo";
	const dataSpace = c.get("effectiveSpace") || space;
	const view = c.req.query("view");

	if (view === "demo") {
		return c.html(renderShell({
			title: `${space} — Docs | rSpace`,
			moduleId: "rdocs",
			spaceSlug: space,
			modules: getModuleInfoList(),
			theme: "dark",
			body: `<div style="max-width:640px;margin:0 auto;padding:3rem 1rem;text-align:center">
	<div style="font-size:3rem;margin-bottom:1rem">📝</div>
	<h2 style="font-size:1.5rem;margin-bottom:0.75rem;background:linear-gradient(135deg,#14b8a6,#22d3ee);-webkit-background-clip:text;-webkit-text-fill-color:transparent">rDocs</h2>
	<p style="color:#94a3b8;margin-bottom:2rem;line-height:1.6">Collaborative documentation powered by Docmost. Create wikis, knowledge bases, and shared documents for your community.</p>
	<a href="?" class="rapp-nav__btn--app-toggle" style="display:inline-block;padding:10px 24px;font-size:0.9rem">Open Docmost</a>
</div>`,
		}));
	}

	// Default: show the external app directly
	return c.html(renderExternalAppShell({
		title: `${space} — Docmost | rSpace`,
		moduleId: "rdocs",
		spaceSlug: space,
		modules: getModuleInfoList(),
		appUrl: DOCMOST_URL,
		appName: "Docmost",
		theme: "dark",
	}));
});

function renderDocsLanding(): string {
	return `<div style="max-width:640px;margin:0 auto;padding:3rem 1rem;text-align:center">
	<div style="font-size:3rem;margin-bottom:1rem">📝</div>
	<h2 style="font-size:1.5rem;margin-bottom:0.75rem;background:linear-gradient(135deg,#14b8a6,#22d3ee);-webkit-background-clip:text;-webkit-text-fill-color:transparent">rDocs</h2>
	<p style="color:#94a3b8;margin-bottom:2rem;line-height:1.6">Collaborative documentation powered by Docmost. Create wikis, knowledge bases, and shared documents for your community.</p>
</div>`;
}

// ── MI Integration ──

export function getLinkedDocsForMI(space: string, limit = 5): { id: string; title: string; url: string; addedAt: number }[] {
	if (!_syncServer) return [];
	const docId = docsDocId(space);
	const doc = _syncServer.getDoc<DocsDoc>(docId);
	if (!doc) return [];
	return Object.values(doc.linkedDocuments)
		.sort((a, b) => b.addedAt - a.addedAt)
		.slice(0, limit)
		.map((d) => ({ id: d.id, title: d.title, url: d.url, addedAt: d.addedAt }));
}

export const docsModule: RSpaceModule = {
	id: "rdocs",
	name: "rDocs",
	icon: "📝",
	description: "Collaborative documentation and knowledge base",
	scoping: { defaultScope: 'global', userConfigurable: true },
	docSchemas: [{ pattern: '{space}:docs:links', description: 'Linked Docmost documents per space', init: docsSchema.init }],
	routes,
	landingPage: renderDocsLanding,
	externalApp: { url: DOCMOST_URL, name: "Docmost" },
	async onInit(ctx) { _syncServer = ctx.syncServer; },
	feeds: [
		{ id: "documents", name: "Documents", kind: "data", description: "Collaborative documents and wiki pages" },
	],
	acceptsFeeds: ["data"],
	outputPaths: [
		{ path: "documents", name: "Documents", icon: "📝", description: "Collaborative documents" },
		{ path: "wikis", name: "Wikis", icon: "📖", description: "Knowledge base wikis" },
	],
};