import upath from 'upath';
import { GlobalConfig } from '../../../config/global.ts';
import { logger } from '../../../logger/index.ts';
import { readLocalFile } from '../../../util/fs/index.ts';
import { createSimpleGit } from '../../../util/git/index.ts';
import type { UpdateDependencyConfig } from '../types.ts';

export default async function updateDependency({
  fileContent,
  upgrade,
}: UpdateDependencyConfig): Promise<string | null> {
  // TODO: types (#22198)
  const localDir = GlobalConfig.get('localDir');
  const authentication = {
    hostTypes: ['git-tags', 'git-refs'],
  };

  const git = createSimpleGit({
    config: { baseDir: localDir },
    authentication,
  });
  const submoduleGit = createSimpleGit({
    // TODO: types (#22198)
    config: { baseDir: upath.join(localDir, upgrade.depName!) },
    authentication,
  });

  try {
    await git.submoduleUpdate([
      '--checkout',
      '--init',
      '--recursive',
      upgrade.depName!,
    ]);
    await submoduleGit.checkout([upgrade.newDigest!]);
    if (upgrade.newValue && upgrade.currentValue !== upgrade.newValue) {
      await git.subModule([
        'set-branch',
        '--branch',
        upgrade.newValue,
        upgrade.depName!,
      ]);
      const updatedPackageContent = await readLocalFile(
        upgrade.packageFile!,
        'utf8',
      );
      return updatedPackageContent!;
    }
    return fileContent;
  } catch (err) {
    logger.debug({ err }, 'submodule checkout error');
    return null;
  }
}