/**
 * Photos module — community photo commons powered by Immich.
 *
 * Provides a gallery UI within the rSpace shell that connects to
 * the Immich instance at {space}.rphotos.online. Proxies API requests
 * for albums and thumbnails to avoid CORS issues.
 */

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 { renderLanding } from "./landing";
import type { SyncServer } from '../../server/local-first/sync-server';
import { photosSchema, photosDocId } from './schemas';
import type { PhotosDoc, SharedAlbum, PhotoAnnotation } from './schemas';

let _syncServer: SyncServer | null = null;

const routes = new Hono();

const IMMICH_BASE = process.env.RPHOTOS_IMMICH_URL || "http://localhost:2284";

// ── Local-first helpers ──

function ensurePhotosDoc(space: string): PhotosDoc {
	const docId = photosDocId(space);
	let doc = _syncServer!.getDoc<PhotosDoc>(docId);
	if (!doc) {
		doc = Automerge.change(Automerge.init<PhotosDoc>(), 'init photos', (d) => {
			const init = photosSchema.init();
			Object.assign(d, init);
			d.meta.spaceSlug = space;
		});
		_syncServer!.setDoc(docId, doc);
	}
	return doc;
}

// ── CRUD: Curated Albums ──

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

routes.post("/api/curations", 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 { name, description = "" } = await c.req.json();
	if (!name) return c.json({ error: "name required" }, 400);
	const id = crypto.randomUUID();
	const docId = photosDocId(space);
	ensurePhotosDoc(space);
	_syncServer.changeDoc<PhotosDoc>(docId, `share album ${id}`, (d) => {
		d.sharedAlbums[id] = { id, name, description, sharedBy: claims.sub || null, sharedAt: Date.now() };
	});
	const updated = _syncServer.getDoc<PhotosDoc>(docId)!;
	return c.json(updated.sharedAlbums[id], 201);
});

routes.delete("/api/curations/:albumId", 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 albumId = c.req.param("albumId");
	const docId = photosDocId(space);
	const doc = ensurePhotosDoc(space);
	if (!doc.sharedAlbums[albumId]) return c.json({ error: "Not found" }, 404);
	_syncServer.changeDoc<PhotosDoc>(docId, `remove album ${albumId}`, (d) => { delete d.sharedAlbums[albumId]; });
	return c.json({ ok: true });
});

// ── CRUD: Photo Annotations ──

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

routes.post("/api/annotations", 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 { assetId, note } = await c.req.json();
	if (!assetId || !note) return c.json({ error: "assetId and note required" }, 400);
	const id = crypto.randomUUID();
	const docId = photosDocId(space);
	ensurePhotosDoc(space);
	_syncServer.changeDoc<PhotosDoc>(docId, `annotate ${assetId}`, (d) => {
		d.annotations[id] = { assetId, note, authorDid: (claims.did as string) || claims.sub || '', createdAt: Date.now() };
	});
	const updated = _syncServer.getDoc<PhotosDoc>(docId)!;
	return c.json(updated.annotations[id], 201);
});

routes.delete("/api/annotations/:annotationId", 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 annotationId = c.req.param("annotationId");
	const docId = photosDocId(space);
	const doc = ensurePhotosDoc(space);
	if (!doc.annotations[annotationId]) return c.json({ error: "Not found" }, 404);
	_syncServer.changeDoc<PhotosDoc>(docId, `delete annotation ${annotationId}`, (d) => { delete d.annotations[annotationId]; });
	return c.json({ ok: true });
});
const IMMICH_API_KEY = process.env.RPHOTOS_API_KEY || "";
const IMMICH_PUBLIC_URL = process.env.RPHOTOS_IMMICH_PUBLIC_URL || "https://demo.rphotos.online";

// ── Proxy: list shared albums ──
routes.get("/api/albums", async (c) => {
	try {
		const res = await fetch(`${IMMICH_BASE}/api/albums?shared=true`, {
			headers: { "x-api-key": IMMICH_API_KEY },
		});
		if (!res.ok) return c.json({ albums: [] });
		const albums = await res.json();
		return c.json({ albums });
	} catch {
		return c.json({ albums: [] });
	}
});

// ── Proxy: album detail with assets ──
routes.get("/api/albums/:id", async (c) => {
	const id = c.req.param("id");
	try {
		const res = await fetch(`${IMMICH_BASE}/api/albums/${id}`, {
			headers: { "x-api-key": IMMICH_API_KEY },
		});
		if (!res.ok) return c.json({ error: "Album not found" }, 404);
		return c.json(await res.json());
	} catch {
		return c.json({ error: "Failed to load album" }, 500);
	}
});

// ── Proxy: recent assets ──
routes.get("/api/assets", async (c) => {
	const size = c.req.query("size") || "50";
	try {
		const res = await fetch(`${IMMICH_BASE}/api/search/metadata`, {
			method: "POST",
			headers: {
				"x-api-key": IMMICH_API_KEY,
				"Content-Type": "application/json",
			},
			body: JSON.stringify({
				size: parseInt(size),
				order: "desc",
				type: "IMAGE",
			}),
		});
		if (!res.ok) return c.json({ assets: [] });
		const data = await res.json();
		return c.json({ assets: data.assets?.items || [] });
	} catch {
		return c.json({ assets: [] });
	}
});

// ── Proxy: asset thumbnail ──
routes.get("/api/assets/:id/thumbnail", async (c) => {
	const id = c.req.param("id");
	const size = c.req.query("size") || "thumbnail";
	try {
		const res = await fetch(`${IMMICH_BASE}/api/assets/${id}/thumbnail?size=${size}`, {
			headers: { "x-api-key": IMMICH_API_KEY },
		});
		if (!res.ok) return c.body(null, 404);
		const body = await res.arrayBuffer();
		return c.body(body, 200, {
			"Content-Type": res.headers.get("Content-Type") || "image/jpeg",
			"Cache-Control": "public, max-age=86400",
		});
	} catch {
		return c.body(null, 500);
	}
});

// ── Proxy: full-size asset ──
routes.get("/api/assets/:id/original", async (c) => {
	const id = c.req.param("id");
	try {
		const res = await fetch(`${IMMICH_BASE}/api/assets/${id}/original`, {
			headers: { "x-api-key": IMMICH_API_KEY },
		});
		if (!res.ok) return c.body(null, 404);
		const body = await res.arrayBuffer();
		return c.body(body, 200, {
			"Content-Type": res.headers.get("Content-Type") || "image/jpeg",
			"Cache-Control": "public, max-age=86400",
		});
	} catch {
		return c.body(null, 500);
	}
});

// ── Embedded Immich UI ──
routes.get("/album", (c) => {
	const spaceSlug = c.req.param("space") || "demo";
	const dataSpace = c.get("effectiveSpace") || spaceSlug;
	return c.html(renderExternalAppShell({
		title: `${spaceSlug} — Immich | rSpace`,
		moduleId: "rphotos",
		spaceSlug,
		modules: getModuleInfoList(),
		appUrl: IMMICH_PUBLIC_URL,
		appName: "Immich",
		theme: "dark",
	}));
});

// ── Page route ──
routes.get("/", (c) => {
	const spaceSlug = c.req.param("space") || "demo";
	const dataSpace = c.get("effectiveSpace") || spaceSlug;
	return c.html(renderShell({
		title: `${spaceSlug} — Photos | rSpace`,
		moduleId: "rphotos",
		spaceSlug,
		modules: getModuleInfoList(),
		theme: "dark",
		body: `<folk-photo-gallery space="${spaceSlug}"></folk-photo-gallery>`,
		scripts: `<script type="module" src="/modules/rphotos/folk-photo-gallery.js?v=2"></script>`,
		styles: `<link rel="stylesheet" href="/modules/rphotos/photos.css">`,
	}));
});

// ── MI Integration ──

export function getSharedAlbumsForMI(space: string, limit = 5): { id: string; name: string; sharedAt: number }[] {
	if (!_syncServer) return [];
	const docId = photosDocId(space);
	const doc = _syncServer.getDoc<PhotosDoc>(docId);
	if (!doc) return [];
	return Object.values(doc.sharedAlbums)
		.sort((a, b) => b.sharedAt - a.sharedAt)
		.slice(0, limit)
		.map((a) => ({ id: a.id, name: a.name, sharedAt: a.sharedAt }));
}

export const photosModule: RSpaceModule = {
	id: "rphotos",
	name: "rPhotos",
	icon: "📸",
	description: "Community photo commons",
	scoping: { defaultScope: 'global', userConfigurable: false },
	docSchemas: [{ pattern: '{space}:photos:albums', description: 'Shared albums and annotations per space', init: photosSchema.init }],
	routes,
	landingPage: renderLanding,
	standaloneDomain: "rphotos.online",
	externalApp: { url: IMMICH_PUBLIC_URL, name: "Immich" },
	async onInit(ctx) { _syncServer = ctx.syncServer; },
	feeds: [
		{
			id: "rphotos",
			name: "Recent Photos",
			kind: "data",
			description: "Stream of recently uploaded photos",
			emits: ["folk-image"],
			filterable: true,
		},
	],
	acceptsFeeds: ["data"],
	outputPaths: [
		{ path: "albums", name: "Albums", icon: "📸", description: "Photo albums and collections" },
		{ path: "galleries", name: "Galleries", icon: "🖼️", description: "Public photo galleries" },
	],
	subPageInfos: [
		{
			path: "album",
			title: "Photo Album",
			icon: "🖼️",
			tagline: "rPhotos Tool",
			description: "Browse a curated photo album with lightbox viewing, metadata display, and easy sharing. Powered by Immich.",
			features: [
				{ icon: "🔍", title: "Lightbox Viewer", text: "Full-screen photo viewing with EXIF data, zoom, and slideshow mode." },
				{ icon: "📤", title: "Easy Sharing", text: "Share individual photos or entire albums with a single link." },
				{ icon: "🏷️", title: "Smart Tags", text: "AI-powered face recognition and object tagging for easy discovery." },
			],
		},
	],
};