import { promises as fs } from "fs";

// Esbuild plugin that optionally obfuscates the emitted bundle with javascript-obfuscator.
export default function javascriptObfuscatorPlugin(obfuscatorOptions = {}) {
	let obfuscatorPromise;

	const loadObfuscator = async () => {
		if (!obfuscatorPromise) {
			obfuscatorPromise = import("javascript-obfuscator")
				.then((module) => module.default ?? module)
				.catch((error) => {
					console.warn("[esbuild] javascript-obfuscator unavailable, skipping obfuscation.", error);
					return null;
				});
		}
		return obfuscatorPromise;
	};

	// Default to preserving line breaks unless explicitly overridden.
	if (typeof obfuscatorOptions.compact === "undefined") {
		obfuscatorOptions.compact = false;
	}

	return {
		name: "javascript-obfuscator",
		setup(build) {
			build.onEnd(async (result) => {
				if (result.errors.length) return;
				const outfile = build.initialOptions.outfile;
				if (!outfile) return;

				try {
					const obfuscator = await loadObfuscator();
					if (!obfuscator?.obfuscate) return;

					const source = await fs.readFile(outfile, "utf8");
					const obfuscatedCode = obfuscator
						.obfuscate(source, obfuscatorOptions)
						.getObfuscatedCode();

					await fs.writeFile(outfile, obfuscatedCode, "utf8");
				} catch (error) {
					console.warn("[esbuild] javascript-obfuscator plugin failed, continuing without obfuscation.", error);
				}
			});
		},
	};
}