import isBefore from 'date-fns/is_before';
import Project from '../../models/project';
import { deleteObjectsFromS3, getObjectKey } from '../aws.controller';
import createApplicationErrorClass from '../../utils/createApplicationErrorClass';

const ProjectDeletionError = createApplicationErrorClass('ProjectDeletionError');

function deleteFilesFromS3(files) {
  deleteObjectsFromS3(files.filter((file) => {
    if (file.url) {
      if (!process.env.S3_DATE || (
        process.env.S3_DATE &&
        isBefore(new Date(process.env.S3_DATE), new Date(file.createdAt)))) {
        return true;
      }
    }
    return false;
  })
    .map(file => getObjectKey(file.url)));
}

export default function deleteProject(req, res) {
  function sendFailure(error) {
    res.status(error.code).json({ message: error.message });
  }

  function sendProjectNotFound() {
    sendFailure(new ProjectDeletionError('Project with that id does not exist', { code: 404 }));
  }

  function handleProjectDeletion(project) {
    if (project == null) {
      sendProjectNotFound();
      return;
    }

    if (!project.user.equals(req.user._id)) {
      sendFailure(new ProjectDeletionError('Authenticated user does not match owner of project', { code: 403 }));
      return;
    }

    deleteFilesFromS3(project.files);

    project.remove((removeProjectError) => {
      if (removeProjectError) {
        sendProjectNotFound();
        return;
      }

      res.status(200).end();
    });
  }

  return Project.findById(req.params.project_id)
    .then(handleProjectDeletion)
    .catch(sendFailure);
}