const { gitDescribeSync } = require('git-describe');
const { version } = require('./package.json');
const { resolve, relative } = require('path');
const { writeFileSync } = require('fs-extra');

function getGitInfo() {
  try {
    return gitDescribeSync({
      dirtyMark: false,
      dirtySemver: false
    });
  } catch (err) {
    const commit = process.env.BUILD_SOURCEVERSION || process.env.GIT_COMMIT || 'unknown';
    const ref = process.env.BUILD_SOURCEBRANCHNAME || process.env.GIT_BRANCH || 'unknown';
    const build = process.env.BUILD_BUILDNUMBER || process.env.BUILD_NUMBER || 'local';

    return {
      raw: `${version}-${build}`,
      tag: version,
      distance: 0,
      hash: commit,
      semverString: version,
      suffix: build,
      ref
    };
  }
}

const gitInfo = getGitInfo();

gitInfo.version = version;

const file = resolve(__dirname, '.', 'src', 'environments', 'version.ts');
writeFileSync(file,
  `// IMPORTANT: THIS FILE IS AUTO GENERATED! DO NOT MANUALLY EDIT OR CHECKIN!
/* tslint:disable */
export const VERSION = ${JSON.stringify(gitInfo, null, 4)};
export const BUILD_STAMP = ${JSON.stringify(new Date())};
/* tslint:enable */
`, { encoding: 'utf-8' });

console.log(`Wrote version info ${gitInfo.raw} to ${relative(resolve(__dirname, '..'), file)}`);