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import { execFile, spawn } from "node:child_process";
import path from "node:path";
import { promisify } from "node:util";
import { danger, shouldLogVerbose } from "../globals.js";
import { logDebug, logError } from "../logger.js";
import { resolveCommandStdio } from "./spawn-utils.js";

const execFileAsync = promisify(execFile);

/**
 * Resolves a command for Windows compatibility.
 * On Windows, non-.exe commands (like npm, pnpm) require their .cmd extension.
 */
function resolveCommand(command: string): string {
  if (process.platform !== "win32") {
    return command;
  }
  const basename = path.basename(command).toLowerCase();
  // Skip if already has an extension (.cmd, .exe, .bat, etc.)
  const ext = path.extname(basename);
  if (ext) {
    return command;
  }
  // Common npm-related commands that need .cmd extension on Windows
  const cmdCommands = ["npm", "pnpm", "yarn", "npx"];
  if (cmdCommands.includes(basename)) {
    return `${command}.cmd`;
  }
  return command;
}

// Simple promise-wrapped execFile with optional verbosity logging.
export async function runExec(
  command: string,
  args: string[],
  opts: number | { timeoutMs?: number; maxBuffer?: number } = 10_000,
): Promise<{ stdout: string; stderr: string }> {
  const options =
    typeof opts === "number"
      ? { timeout: opts, encoding: "utf8" as const }
      : {
          timeout: opts.timeoutMs,
          maxBuffer: opts.maxBuffer,
          encoding: "utf8" as const,
        };
  try {
    const { stdout, stderr } = await execFileAsync(resolveCommand(command), args, options);
    if (shouldLogVerbose()) {
      if (stdout.trim()) {
        logDebug(stdout.trim());
      }
      if (stderr.trim()) {
        logError(stderr.trim());
      }
    }
    return { stdout, stderr };
  } catch (err) {
    if (shouldLogVerbose()) {
      logError(danger(`Command failed: ${command} ${args.join(" ")}`));
    }
    throw err;
  }
}

export type SpawnResult = {
  stdout: string;
  stderr: string;
  code: number | null;
  signal: NodeJS.Signals | null;
  killed: boolean;
};

export type CommandOptions = {
  timeoutMs: number;
  cwd?: string;
  input?: string;
  env?: NodeJS.ProcessEnv;
  windowsVerbatimArguments?: boolean;
};

export async function runCommandWithTimeout(
  argv: string[],
  optionsOrTimeout: number | CommandOptions,
): Promise<SpawnResult> {
  const options: CommandOptions =
    typeof optionsOrTimeout === "number" ? { timeoutMs: optionsOrTimeout } : optionsOrTimeout;
  const { timeoutMs, cwd, input, env } = options;
  const { windowsVerbatimArguments } = options;
  const hasInput = input !== undefined;

  const shouldSuppressNpmFund = (() => {
    const cmd = path.basename(argv[0] ?? "");
    if (cmd === "npm" || cmd === "npm.cmd" || cmd === "npm.exe") {
      return true;
    }
    if (cmd === "node" || cmd === "node.exe") {
      const script = argv[1] ?? "";
      return script.includes("npm-cli.js");
    }
    return false;
  })();

  const resolvedEnv = env ? { ...process.env, ...env } : { ...process.env };
  if (shouldSuppressNpmFund) {
    if (resolvedEnv.NPM_CONFIG_FUND == null) {
      resolvedEnv.NPM_CONFIG_FUND = "false";
    }
    if (resolvedEnv.npm_config_fund == null) {
      resolvedEnv.npm_config_fund = "false";
    }
  }

  const stdio = resolveCommandStdio({ hasInput, preferInherit: true });
  const child = spawn(resolveCommand(argv[0]), argv.slice(1), {
    stdio,
    cwd,
    env: resolvedEnv,
    windowsVerbatimArguments,
  });
  // Spawn with inherited stdin (TTY) so tools like `pi` stay interactive when needed.
  return await new Promise((resolve, reject) => {
    let stdout = "";
    let stderr = "";
    let settled = false;
    const timer = setTimeout(() => {
      if (typeof child.kill === "function") {
        child.kill("SIGKILL");
      }
    }, timeoutMs);

    if (hasInput && child.stdin) {
      child.stdin.write(input ?? "");
      child.stdin.end();
    }

    child.stdout?.on("data", (d) => {
      stdout += d.toString();
    });
    child.stderr?.on("data", (d) => {
      stderr += d.toString();
    });
    child.on("error", (err) => {
      if (settled) {
        return;
      }
      settled = true;
      clearTimeout(timer);
      reject(err);
    });
    child.on("close", (code, signal) => {
      if (settled) {
        return;
      }
      settled = true;
      clearTimeout(timer);
      resolve({ stdout, stderr, code, signal, killed: child.killed });
    });
  });
}