/**
 * Space registry — CRUD for rSpace spaces.
 *
 * Spaces are stored as Automerge CRDT documents (extending the existing
 * community-store pattern). This module provides Hono routes for listing,
 * creating, and managing spaces.
 */

import { Hono } from "hono";
import { stat } from "node:fs/promises";
import {
	communityExists,
	createCommunity,
	loadCommunity,
	getDocumentData,
	listCommunities,
} from "./community-store";
import type { SpaceVisibility } from "./community-store";
import {
	verifyEncryptIDToken,
	extractToken,
} from "@encryptid/sdk/server";
import type { EncryptIDClaims } from "@encryptid/sdk/server";
import { getAllModules } from "../shared/module";

const spaces = new Hono();

// ── List spaces (public + user's own/member spaces) ──

spaces.get("/", async (c) => {
	const slugs = await listCommunities();

	// Check if user is authenticated
	const token = extractToken(c.req.raw.headers);
	let claims: EncryptIDClaims | null = null;
	if (token) {
		try {
			claims = await verifyEncryptIDToken(token);
		} catch {
			// Invalid token — treat as unauthenticated
		}
	}

	const spacesList = [];
	for (const slug of slugs) {
		await loadCommunity(slug);
		const data = getDocumentData(slug);
		if (data?.meta) {
			const vis = data.meta.visibility || "public_read";
			const isOwner = !!(claims && data.meta.ownerDID === claims.sub);
			const memberEntry = claims ? data.members?.[claims.sub] : undefined;
			const isMember = !!memberEntry;

			// Include if: public/public_read OR user is owner OR user is member
			if (vis === "public" || vis === "public_read" || isOwner || isMember) {
				spacesList.push({
					slug: data.meta.slug,
					name: data.meta.name,
					visibility: vis,
					createdAt: data.meta.createdAt,
					role: isOwner ? "owner" : memberEntry?.role || undefined,
				});
			}
		}
	}

	return c.json({ spaces: spacesList });
});

// ── Create a new space (requires auth) ──

spaces.post("/", 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 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. Must be one of: ${validVisibilities.join(", ")}` }, 400);
	}

	if (await communityExists(slug)) {
		return c.json({ error: "Space already exists" }, 409);
	}

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

	// Notify all modules about the new space
	for (const mod of getAllModules()) {
		if (mod.onSpaceCreate) {
			try {
				await mod.onSpaceCreate(slug);
			} catch (e) {
				console.error(`[Spaces] Module ${mod.id} onSpaceCreate failed:`, e);
			}
		}
	}

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

// ── Get space info ──

spaces.get("/:slug", async (c) => {
	const slug = c.req.param("slug");
	await loadCommunity(slug);
	const data = getDocumentData(slug);

	if (!data) {
		return c.json({ error: "Space not found" }, 404);
	}

	return c.json({
		slug: data.meta.slug,
		name: data.meta.name,
		visibility: data.meta.visibility,
		createdAt: data.meta.createdAt,
		ownerDID: data.meta.ownerDID,
		memberCount: Object.keys(data.members || {}).length,
	});
});

// ── Admin: list ALL spaces with detailed stats ──

spaces.get("/admin", async (c) => {
	const STORAGE_DIR = process.env.STORAGE_DIR || "./data/communities";
	const slugs = await listCommunities();

	const spacesList = [];
	for (const slug of slugs) {
		await loadCommunity(slug);
		const data = getDocumentData(slug);
		if (!data?.meta) continue;

		const shapes = data.shapes || {};
		const members = data.members || {};
		const shapeCount = Object.keys(shapes).length;
		const memberCount = Object.keys(members).length;

		// Get file size on disk
		let fileSizeBytes = 0;
		try {
			const s = await stat(`${STORAGE_DIR}/${slug}.automerge`);
			fileSizeBytes = s.size;
		} catch {
			try {
				const s = await stat(`${STORAGE_DIR}/${slug}.json`);
				fileSizeBytes = s.size;
			} catch { /* not on disk yet */ }
		}

		// Count shapes by type
		const shapeTypes: Record<string, number> = {};
		for (const shape of Object.values(shapes)) {
			const t = (shape as Record<string, unknown>).type as string || "unknown";
			shapeTypes[t] = (shapeTypes[t] || 0) + 1;
		}

		spacesList.push({
			slug: data.meta.slug,
			name: data.meta.name,
			visibility: data.meta.visibility || "public_read",
			createdAt: data.meta.createdAt,
			ownerDID: data.meta.ownerDID,
			shapeCount,
			memberCount,
			fileSizeBytes,
			shapeTypes,
		});
	}

	// Sort by creation date descending (newest first)
	spacesList.sort((a, b) => {
		const da = a.createdAt ? new Date(a.createdAt).getTime() : 0;
		const db = b.createdAt ? new Date(b.createdAt).getTime() : 0;
		return db - da;
	});

	return c.json({ spaces: spacesList, total: spacesList.length });
});

export { spaces };