// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2023-Present The Pepr Authors

import { fork } from "child_process";

import { CapabilityExport } from "../types";

/**
 * Read the capabilities from the module by running it in build mode
 * @param path
 * @returns
 */
export function loadCapabilities(path: string): Promise<CapabilityExport[]> {
  return new Promise((resolve, reject) => {
    // Fork is needed with the PEPR_MODE env var to ensure the module is loaded in build mode and will send back the capabilities
    const program = fork(path, {
      env: {
        ...process.env,
        LOG_LEVEL: "warn",
        PEPR_MODE: "build",
        NODE_OPTIONS: "--disable-warning=DEP0040",
      },
    });

    // Wait for the module to send back the capabilities
    program.on("message", message => {
      // Cast the message to the ModuleCapabilities type
      const capabilities = message.valueOf() as CapabilityExport[];
      resolve(capabilities);
    });

    program.on("error", error => {
      reject(error);
    });
  });
}