import { promises } from 'fs';
const { access, chmod, rename } = promises;
import { homedir } from 'os';
import { join } from 'path';
import { log } from './log';
import { getDbFileName, getCustomDbFilePath } from './getDbFile';
import { getAlksConfigFolder } from './folders';

const OLD_DB_FILE_PATH = join(homedir(), getDbFileName());
const NEW_DB_FILE_PATH = join(getAlksConfigFolder(), getDbFileName());

export async function updateDbFileLocation(): Promise<void> {
  const customDbFilePath = getCustomDbFilePath();
  if (customDbFilePath) {
    // Don't attempt to migrate if they're using a custom db file path
    log(
      `Custom db file path detected so no migration is attempted. Using DB file at ${customDbFilePath}`
    );
    return;
  } else {
    try {
      const oldFileExists = await access(OLD_DB_FILE_PATH)
        .then(() => true)
        .catch(() => false);
      const newFileExists = await access(NEW_DB_FILE_PATH)
        .then(() => true)
        .catch(() => false);

      // If new file hasn't been created yet but the old file exists, move the old file to the new location
      if (oldFileExists && !newFileExists) {
        log('rename ' + OLD_DB_FILE_PATH + ' to ' + NEW_DB_FILE_PATH);
        await rename(OLD_DB_FILE_PATH, NEW_DB_FILE_PATH);

        // ensure the new file has the correct permissions
        await chmod(NEW_DB_FILE_PATH, 0o600);
      }
    } catch (e) {
      // If the conversion fails, just pretend like the netrc file doesn't exist and continue anyway
      log('failed to move old db file to ALKS config folder: ' + e);
    }
  }
}