import * as semver from 'semver';
import * as exec from './exec';

export async function isAvailable(): Promise<Boolean> {
  return await exec.exec(`docker`, ['buildx'], true).then(res => {
    if (res.stderr != '' && !res.success) {
      return false;
    }
    return res.success;
  });
}

export async function getVersion(): Promise<string> {
  return await exec.exec(`docker`, ['buildx', 'version'], true).then(res => {
    if (res.stderr != '' && !res.success) {
      throw new Error(res.stderr);
    }
    return parseVersion(res.stdout);
  });
}

export async function parseVersion(stdout: string): Promise<string> {
  const matches = /\sv?([0-9.]+)/.exec(stdout);
  if (!matches) {
    throw new Error(`Cannot parse Buildx version`);
  }
  return semver.clean(matches[1]);
}