// src/detect.ts
import fs from "fs";
import path from "path";
import findUp from "find-up";
var AGENTS = ["pnpm", "yarn", "npm", "pnpm@6", "yarn@berry", "bun"];
var LOCKS = {
  "bun.lockb": "bun",
  "pnpm-lock.yaml": "pnpm",
  "yarn.lock": "yarn",
  "package-lock.json": "npm",
  "npm-shrinkwrap.json": "npm"
};
async function detectPackageManager(cwd = process.cwd()) {
  let agent = null;
  const lockPath = await findUp(Object.keys(LOCKS), { cwd });
  let packageJsonPath;
  if (lockPath)
    packageJsonPath = path.resolve(lockPath, "../package.json");
  else
    packageJsonPath = await findUp("package.json", { cwd });
  if (packageJsonPath && fs.existsSync(packageJsonPath)) {
    try {
      const pkg = JSON.parse(fs.readFileSync(packageJsonPath, "utf8"));
      if (typeof pkg.packageManager === "string") {
        const [name, version] = pkg.packageManager.split("@");
        if (name === "yarn" && parseInt(version) > 1)
          agent = "yarn@berry";
        else if (name === "pnpm" && parseInt(version) < 7)
          agent = "pnpm@6";
        else if (name in AGENTS)
          agent = name;
        else
          console.warn("[ni] Unknown packageManager:", pkg.packageManager);
      }
    } catch {
    }
  }
  if (!agent && lockPath)
    agent = LOCKS[path.basename(lockPath)];
  return agent;
}

// src/install.ts
import execa from "execa";
async function installPackage(names, options = {}) {
  const detectedAgent = options.packageManager || await detectPackageManager(options.cwd) || "npm";
  const [agent] = detectedAgent.split("@");
  if (!Array.isArray(names))
    names = [names];
  const args = options.additionalArgs || [];
  if (options.preferOffline) {
    if (detectedAgent === "yarn@berry")
      args.unshift("--cached");
    else
      args.unshift("--prefer-offline");
  }
  return execa(
    agent,
    [
      agent === "yarn" ? "add" : "install",
      options.dev ? "-D" : "",
      ...args,
      ...names
    ].filter(Boolean),
    {
      stdio: options.silent ? "ignore" : "inherit",
      cwd: options.cwd
    }
  );
}
export {
  detectPackageManager,
  installPackage
};