import fs from 'fs';

import { walkTree } from './fileTree';
import { Logger } from './options/logger';
import { Directory } from './interfaces/directory.interface';
import { FileTreeLocation } from './interfaces/location.interface';

export function purge(
  rootTree: Directory,
  shouldPurge: boolean,
  noHeader: boolean,
  barrelName: string,
  logger: Logger
) {
  // Delete any existing barrels.
  if (shouldPurge) {
    logger.debug(`Purging barrels for ${rootTree}`);
    walkTree(rootTree, (directory: Directory) => {
      directory.files
        .filter((file: FileTreeLocation) => {
          return file.name === barrelName;
        })
        .filter(file => {
          if (noHeader) {
            return true;
          }
          return fs.readFileSync(file.path).includes('@file Automatically generated by barrelsby.');
        })
        .forEach((file: FileTreeLocation) => {
          logger.debug(`Deleting existing barrel @ ${file.path}`);
          // Delete barrel file and clean up tree model.
          fs.unlinkSync(file.path);
          directory.files.splice(directory.files.indexOf(file), 1);
          directory.barrel = undefined;
        });
    });
  }
}