// assetManifest.js

import fs from "fs";
import path from "path";
import crypto from "crypto";
import { __dirname } from "../dirname.js";

const publicDir = path.join(__dirname, "public");

function hashFile(filePath) {
	const content = fs.readFileSync(filePath);
	return crypto.createHash("md5").update(content).digest("hex").slice(0, 8);
}

function buildManifest(dir, base = "") {
	const manifest = {};
	const entries = fs.readdirSync(dir, { withFileTypes: true });

	for (const entry of entries) {
		const relativePath = path.join(base, entry.name);
		const fullPath = path.join(dir, entry.name);

		if (entry.isDirectory()) {
			Object.assign(manifest, buildManifest(fullPath, relativePath));
		} else if (/\.(css|js|png|jpg|jpeg|svg|webp|ico|woff2?|ttf|eot|otf)$/.test(entry.name)) {
			const hash = hashFile(fullPath);
			const keyPath = relativePath.split(path.sep).join("/"); // ← always forward slashes
			manifest[`/public/${keyPath}`] = `/public/${keyPath}?h=${hash}`;
		}
	}

	return manifest;
}

let manifest = {};

export function initAssetManifest() {
	manifest = buildManifest(publicDir);
	console.log(`Asset manifest built: ${Object.keys(manifest).length} files`);
}

export function getAssetUrl(logicalPath) {
	return manifest[logicalPath] ?? logicalPath;
}