const { GraphQLString } = require('graphql');
const fs = require('fs-extra');
const path = require('path');

module.exports = ({ type, getNodeAndSavePathDependency, pathPrefix = '' }) => {
  if (type.name !== 'File') {
    return {};
  }

  return {
    publicURL: {
      type: GraphQLString,
      args: {},
      description: 'Copy file to static directory and return public url to it',
      resolve: (file, fieldArgs, context) => {
        const details = getNodeAndSavePathDependency(file.id, context.path);
        const fileName = `${file.name}-${file.internal.contentDigest}${
          details.ext
        }`;

        const publicPath = path.join(
          process.cwd(),
          'public',
          'static',
          fileName
        );

        if (!fs.existsSync(publicPath)) {
          fs.copy(details.absolutePath, publicPath, err => {
            if (err) {
              console.error(
                `error copying file from ${
                  details.absolutePath
                } to ${publicPath}`,
                err
              );
            }
          });
        }

        return `${pathPrefix}/static/${fileName}`;
      }
    }
  };
};