import * as exec from '@actions/exec';

export const listSdks = async () => {
  const {stdout, exitCode} = await exec
    .getExecOutput('dotnet', ['--list-sdks'], {
      ignoreReturnCode: true
    })
    .catch(() => ({stdout: '', exitCode: 1}));

  if (exitCode) {
    return [];
  }

  return (
    stdout
      .trim()
      .split('\n')
      .map(versionInfo => versionInfo.trim())
      .map(versionInfo => versionInfo.split(' ')[0])
      // reverses output so newer versions are first
      .reverse()
  );
};

/**
 * Function that matches string like that
 * '3.1', '3.1.x', '3', '3.x', '6.0.4xx' to
 * correct version number like '3.1.201', '3.1.201', '3.1.201', '3.1.201', '6.0.402'
 */
export const findMatchingVersion = (
  versionPattern: string,
  versions: string[]
): string | undefined => {
  if (!versionPattern || versionPattern === 'x' || versionPattern === '*') {
    return versions.at(0);
  }

  const versionArray = versionPattern.split('.');

  if (versionArray.length < 3) {
    versionArray.push(...Array(3 - versionArray.length).fill('x'));
  }

  const normalizedVersion = versionArray.join('.');

  const versionRegex = new RegExp(
    `^${normalizedVersion.replace(/x/g, '\\d+')}`
  );

  return versions.find(v => versionRegex.test(v));
};