import * as cache from '@actions/cache';
import * as core from '@actions/core';
import * as exec from '@actions/exec';
import {supportedPackageManagers, PackageManagerInfo} from './package-managers';

export const getCommandOutput = async (toolCommand: string) => {
  let {stdout, stderr, exitCode} = await exec.getExecOutput(
    toolCommand,
    undefined,
    {ignoreReturnCode: true}
  );

  if (exitCode) {
    stderr = !stderr.trim()
      ? `The '${toolCommand}' command failed with exit code: ${exitCode}`
      : stderr;
    throw new Error(stderr);
  }

  return stdout.trim();
};

export const getPackageManagerInfo = async (packageManager: string) => {
  if (!supportedPackageManagers[packageManager]) {
    throw new Error(
      `It's not possible to use ${packageManager}, please, check correctness of the package manager name spelling.`
    );
  }
  const obtainedPackageManager = supportedPackageManagers[packageManager];

  return obtainedPackageManager;
};

export const getCacheDirectoryPath = async (
  packageManagerInfo: PackageManagerInfo
) => {
  const pathList = await Promise.all(
    packageManagerInfo.cacheFolderCommandList.map(async command =>
      getCommandOutput(command)
    )
  );

  const cachePaths = pathList.filter(item => item);

  if (!cachePaths.length) {
    throw new Error(`Could not get cache folder paths.`);
  }

  return cachePaths;
};

export function isGhes(): boolean {
  const ghUrl = new URL(
    process.env['GITHUB_SERVER_URL'] || 'https://github.com'
  );
  return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
}

export function isCacheFeatureAvailable(): boolean {
  if (cache.isFeatureAvailable()) {
    return true;
  }

  if (isGhes()) {
    core.warning(
      'Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.'
    );
    return false;
  }

  core.warning(
    'The runner was not able to contact the cache service. Caching will be skipped'
  );
  return false;
}