import * as childProcess from 'child_process';

export function execute(
  command: string,
  args: string[],
  options?: { cwd?: string; env?: any },
  shell: boolean = false,
): Promise<string> {
  const spawnOptions: childProcess.SpawnOptions = {
    shell,
    env: { ...process.env },
  };
  if (options?.cwd) {
    spawnOptions.cwd = options.cwd;
  }
  if (options?.env) {
    spawnOptions.env = { ...process.env, ...options.env };
  }

  // Before spawning an external process, we look if we need to restore the system proxy configuration,
  // which overides the cli internal proxy configuration.
  if (process.env.SNYK_SYSTEM_HTTP_PROXY !== undefined) {
    spawnOptions.env.HTTP_PROXY = process.env.SNYK_SYSTEM_HTTP_PROXY;
  }
  if (process.env.SNYK_SYSTEM_HTTPS_PROXY !== undefined) {
    spawnOptions.env.HTTPS_PROXY = process.env.SNYK_SYSTEM_HTTPS_PROXY;
  }
  if (process.env.SNYK_SYSTEM_NO_PROXY !== undefined) {
    spawnOptions.env.NO_PROXY = process.env.SNYK_SYSTEM_NO_PROXY;
  }

  return new Promise((resolve, reject) => {
    let stdout = '';
    let stderr = '';

    const proc = childProcess.spawn(command, args, spawnOptions);
    proc.stdout.on('data', (data: Buffer) => {
      stdout = stdout + data;
    });
    proc.stderr.on('data', (data: Buffer) => {
      stderr = stderr + data;
    });

    proc.on('close', (code) => {
      if (code !== 0) {
        return reject(stdout || stderr);
      }
      resolve(stdout || stderr);
    });
  });
}