import { readdir, stat, mkdir, rm } from "node:fs/promises";
import { join } from "node:path";

const CLIENT_DIR = join(import.meta.dir, "client");
const PUBLIC_DIR = join(import.meta.dir, "../public");

/**
 * Automatically bundles `src/client/<module-name>/...`
 * into `public/static/<module-name>/...
 * and becomes available at `/static/<module-name>/index.js`
 */
export async function bundle_typescript() {
    await rm(PUBLIC_DIR, { force: true, recursive: true });
    await mkdir(PUBLIC_DIR, {});
    const entries = await readdir(CLIENT_DIR);

    for (const module_name of entries) {
        const module_path = join(CLIENT_DIR, module_name);

        const info = await stat(module_path);

        if (!info.isDirectory()) continue;

        const files = await readdir(module_path);

        const entrypoints = files
            .filter(file => file.endsWith(".ts"))
            .map(file => join(module_path, file));

        if (entrypoints.length === 0) continue;

        const result = await Bun.build({
            entrypoints,

            outdir: join(PUBLIC_DIR, module_name),

            target: "browser",
            format: "esm",
            splitting: true,

            minify: true,
            sourcemap: "none",
            env: "disable",

            banner: "// Developed by Poyo.",

            naming: {
                entry: "[name].js",
                chunk: "chunks/[name]-[hash].js",
                asset: "assets/[name]-[hash].[ext]"
            }
        });

        if (!result.success) {
            console.error(result.logs);
            throw new Error(`Failed to bundle "${module_name}"`);
        }
    }
}