import * as nodeHttp from "node:http";
import * as nodeHttps from "node:https";
import { fileURLToPath } from "node:url";
import { paraglideVitePlugin } from "@inlang/paraglide-js";
import tailwindcss from "@tailwindcss/vite";
import { nitroV2Plugin } from "@tanstack/nitro-v2-vite-plugin";
import { tanstackStart } from "@tanstack/react-start/plugin/vite";
import viteReact from "@vitejs/plugin-react";
import { defineConfig, type Plugin } from "vite";
import viteTsConfigPaths from "vite-tsconfig-paths";

// Absolute path to our Nitro server source (middleware + routes). Passed as a scanDir
// because the TanStack Nitro plugin doesn't auto-scan a server/ dir.
const serverDir = fileURLToPath(new URL("./server", import.meta.url));

// The management API the console drives. The browser always talks same-origin (/api/...):
// in `vite dev` the dev server proxies it (below); in the built Bun/Nitro server a Nitro
// route-rule proxies it (below). Override the upstream with PUNKTFUNK_MGMT_URL.
const MGMT_URL = process.env.PUNKTFUNK_MGMT_URL ?? "https://127.0.0.1:47990";

// Dev-only `/plugin-ui/<id>/**` reverse proxy — the vite-dev counterpart of the Bun/Nitro route
// (server/routes/plugin-ui/[...].ts), which can't run in dev because it uses Bun's `tls` fetch
// option. Same contract: look up the plugin's {port, secret} from the management API server-side,
// inject the secret, strip the cookie, dial 127.0.0.1 only, stream the response (SSE included).
// Needs PUNKTFUNK_MGMT_TOKEN in the dev environment (like talking to any token-required host).
function pluginUiDevProxy(): Plugin {
	const fetchCred = (
		id: string,
		token: string,
	): Promise<{ port: number; secret: string } | null> =>
		new Promise((resolve) => {
			const u = new URL(`${MGMT_URL}/api/v1/plugins/${id}/ui-credential`);
			const mod = u.protocol === "https:" ? nodeHttps : nodeHttp;
			const r = mod.request(
				u,
				{
					method: "GET",
					headers: { authorization: `Bearer ${token}` },
					rejectUnauthorized: false, // host's self-signed loopback cert
				} as nodeHttps.RequestOptions,
				(resp) => {
					let data = "";
					resp.on("data", (c) => {
						data += c;
					});
					resp.on("end", () => {
						if (resp.statusCode === 200) {
							try {
								resolve(JSON.parse(data));
							} catch {
								resolve(null);
							}
						} else resolve(null);
					});
				},
			);
			r.on("error", () => resolve(null));
			r.end();
		});

	return {
		name: "punktfunk-plugin-ui-dev-proxy",
		configureServer(server) {
			server.middlewares.use("/plugin-ui", async (req, res) => {
				const raw = req.url ?? "/"; // connect strips the /plugin-ui mount prefix
				const m = raw.match(/^\/([a-z][a-z0-9-]*)(\/[^?]*)?(\?.*)?$/);
				const id = m?.[1];
				if (!id) {
					res.statusCode = 404;
					res.end("bad plugin-ui path");
					return;
				}
				const rest = m?.[2] ?? "/";
				const search = m?.[3] ?? "";
				const token = process.env.PUNKTFUNK_MGMT_TOKEN;
				if (!token) {
					res.statusCode = 503;
					res.end("dev plugin-ui proxy: set PUNKTFUNK_MGMT_TOKEN");
					return;
				}
				const cred = await fetchCred(id, token);
				if (!cred) {
					res.statusCode = 502;
					res.end(`plugin "${id}" is not running`);
					return;
				}
				const headers = { ...req.headers } as Record<string, string | string[]>;
				delete headers.host;
				delete headers.cookie;
				delete headers.authorization;
				headers["x-forwarded-prefix"] = `/plugin-ui/${id}`;
				const proxyReq = nodeHttp.request(
					{
						host: "127.0.0.1",
						port: cred.port,
						method: req.method,
						path: rest + search,
						headers: { ...headers, authorization: `Bearer ${cred.secret}` },
					},
					(pr) => {
						res.statusCode = pr.statusCode ?? 502;
						for (const [k, v] of Object.entries(pr.headers)) {
							if (v !== undefined) res.setHeader(k, v);
						}
						pr.pipe(res); // stream (SSE included)
					},
				);
				proxyReq.on("error", () => {
					res.statusCode = 502;
					res.end("plugin unreachable");
				});
				req.pipe(proxyReq);
			});
		},
	};
}

export default defineConfig({
	server: {
		proxy: {
			// `secure: false`: the host serves its own self-signed identity cert on loopback.
			"/api": { target: MGMT_URL, changeOrigin: true, secure: false },
		},
	},
	plugins: [
		// First, so it intercepts /plugin-ui before the SSR catch-all in dev.
		pluginUiDevProxy(),
		viteTsConfigPaths({ projects: ["./tsconfig.json"] }),
		tailwindcss(),
		paraglideVitePlugin({
			project: "./project.inlang",
			outdir: "./src/paraglide",
			strategy: ["localStorage", "preferredLanguage", "baseLocale"],
		}),
		// Full SSR on the TanStack Start runtime (the management console's data queries run
		// client-side after hydration — React Query doesn't fetch during SSR — so the server
		// renders a data-free shell that hydrates in the browser).
		tanstackStart(),
		// Nitro v2 is the deployment target: the `bun` preset bundles a Bun-runnable server to
		// .output/ (`bun run .output/server/index.mjs`). Auth + the /api proxy live in the
		// scanned `server/` dir (middleware/auth.ts gates every request; routes/api/[...].ts
		// proxies to the management host injecting the bearer token server-side) — NOT a static
		// routeRule, so the proxy runs behind the login gate and reads env at runtime.
		nitroV2Plugin({
			// bun + a CUSTOM entry: Nitro's `bun` preset bundles the handler, and `entry` swaps the
			// stock self-listening entry for ours (`nitro-entry/bun-https.mjs`), which calls
			// `Bun.serve({ tls })` so the console is served over HTTPS (HTTP/1.1 over TLS) with the
			// host's own identity cert. (No HTTP/2 — Bun.serve has no h2 server — and no HTTP/3, which a
			// browser won't speak against this self-signed, no-SAN host cert.) Bun is the runtime
			// everywhere now — the Windows installer already bundles it, and the punktfunk-web .deb
			// vendors it (it can't be `node`: `Bun.serve` is a bun API). (dev `vite dev` is unaffected.)
			preset: "bun",
			entry: fileURLToPath(
				new URL("./nitro-entry/bun-https.mjs", import.meta.url),
			),
			// BUNDLE every dependency into the server output (no externalized node_modules). Three wins:
			// (1) the .output tree drops from ~47k files / 730 MB (the whole untree-shaken @unom/ui dep
			// tree — payload, lexical, date-fns…) to a handful of tree-shaken chunks; (2) the output is a
			// self-contained ~75-file `.output` the bundled `bun` runs directly (the Windows installer
			// ships bun + that `.output`, not node + a node_modules forest); (3) it removes the
			// bare external imports (`srvx`, `seroval`…) bun couldn't resolve at runtime — the reason we
			// used to need node. node still runs the same self-contained output for the Linux .deb.
			noExternals: true,
			compatibilityDate: "2026-06-10",
			// Scan server/{middleware,routes} for the auth gate + the /api proxy.
			scanDirs: [serverDir],
		}),
		// Must come AFTER tanstackStart — provides the React JSX transform + Refresh runtime
		// that Start's dev mode requires (omitting it leaves the client JS unable to load).
		viteReact(),
	],
});