import express, { type Express } from "express";
import fs from "fs";
import path, { dirname } from "path";
import { fileURLToPath } from "url";
import { createServer as createViteServer, createLogger } from "vite";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
import { type Server } from "http";
import viteConfig from "../vite.config";
import { nanoid } from "nanoid";

const viteLogger = createLogger();

export function log(message: string, source = "express") {
	const formattedTime = new Date().toLocaleTimeString("en-US", {
		hour: "numeric",
		minute: "2-digit",
		second: "2-digit",
		hour12: true,
	});

	console.log(`${formattedTime} [${source}] ${message}`);
}

export async function setupVite(app: Express, server: Server) {
	const serverOptions = {
		middlewareMode: true,
		hmr: { server },
		allowedHosts: true,
	};

	const vite = await createViteServer({
		...viteConfig,
		configFile: false,
		customLogger: {
			...viteLogger,
			error: (msg, options) => {
				viteLogger.error(msg, options);
				process.exit(1);
			},
		},
		server: serverOptions,
		appType: "custom",
	});

	app.use(vite.middlewares);
	app.use("*", async (req, res, next) => {
		const url = req.originalUrl;

		try {
			const clientTemplate = path.resolve(
				__dirname,
				"..",
				"client",
				"index.html",
			);

			// always reload the index.html file from disk incase it changes
			let template = await fs.promises.readFile(clientTemplate, "utf-8");
			template = template.replace(
				`src="/src/main.tsx"`,
				`src="/src/main.tsx?v=${nanoid()}"`,
			);
			const page = await vite.transformIndexHtml(url, template);
			res.status(200).set({ "Content-Type": "text/html" }).end(page);
		} catch (e) {
			vite.ssrFixStacktrace(e as Error);
			next(e);
		}
	});
}

export function serveStatic(app: Express) {
	const distPath = path.resolve(__dirname, "public");
	const uploadsPath = path.resolve(process.cwd(), "uploads"); // your uploads folder

	if (!fs.existsSync(distPath)) {
		throw new Error(
			`Could not find the build directory: ${distPath}, make sure to build the client first`,
		);
	}

	if (!fs.existsSync(uploadsPath)) {
		console.warn(`Uploads directory not found at ${uploadsPath}`);
	}

	// Serve uploads folder for production
	app.use('/uploads', express.static(uploadsPath));

	// Serve the React build
	app.use(express.static(distPath));

	// Catch-all to serve React index.html for client-side routing
	app.use("*", (_req, res) => {
		res.sendFile(path.resolve(distPath, "index.html"));
	});
}