import path from "node:path";
import type { CommandRegistry } from "./commandRegistry";
import { Logger } from "tslog";
import { MODULE_META_KEY } from "@/base/ModuleBase";

const logger = new Logger({
  type: "pretty",
  name: "loadModules",
});

export async function loadModules(
  registry: CommandRegistry,
  prefix: string,
  pattern = "src/commands/**/*.ts",
  options?: { namespace?: string },
): Promise<void> {
  const glob = new Bun.Glob(pattern);

  for await (const file of glob.scan(".")) {
    const absPath = path.resolve(file);

    logger.debug(`Loading module from "${absPath}"`);

    const mod = await import(Bun.pathToFileURL(absPath).href);

    for (const exported of Object.values(mod)) {
      if (isModuleCtor(exported)) {
        const instance = new exported();
        registry.registerModule(prefix, instance, options);
      }
    }
  }
}

function isModuleCtor(val: unknown): val is new () => object {
  return typeof val === "function" && Reflect.hasMetadata(MODULE_META_KEY, val);
}