import { exec } from "child_process";
import fs from "fs/promises";
import { fileExists } from "./files";

/**
 * Installs the specified npm packages as dependencies in the 'infrastructure' directory.
 *
 * @param packages - An array of package names to install.
 * @returns A promise that resolves with the standard output of the npm install command, or rejects with an error.
 */
export async function installDependencies(packages: string[]) {
  return new Promise((resolve, reject) => {
    exec(
      `npm install --save ${packages.join(" ")}`,
      { cwd: "infrastructure" },
      (err, stdout, stderr) => {
        if (err) {
          reject(err);
        } else {
          resolve(stdout);
        }
      }
    );
  });
}

export const hasDependency = async (dependency: string) => {
  if (!(await fileExists("package.json"))) {
    return false;
  }

  const packageJson = JSON.parse(await fs.readFile("package.json", "utf-8"));
  return Boolean(
    packageJson.dependencies?.[dependency] ||
      packageJson.devDependencies?.[dependency]
  );
};

export async function addNodePackageScript(name: string, cmd: string) {
  if (!(await fileExists("package.json"))) {
    return; // we only support creating commands in package.json right now
  }

  const packageJSON = JSON.parse(await fs.readFile("package.json", "utf-8"));
  if (!packageJSON.scripts) {
    packageJSON.scripts = {};
  }

  packageJSON.scripts[name] = cmd;

  await fs.writeFile("package.json", JSON.stringify(packageJSON, null, 2));
}